USACE / NAVFAC / AFCESA / NASA UFGS-44 46 00 (April 2006)
--------------------------
Preparing Activity: USACE Superseding
UFGS-44 46 00 (August 2004)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 44 46 00
PUMPS; SEWAGE AND SLUDGE
04/06
NOTE: This guide specification covers the requirements for sewage and sludge
pumps for domestic type waste.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
This guide specification includes tailoring options for centrifugal solids handling
pumps, submersible centrifugal pumps, self-priming centrifugal pumps, screw
pumps, plunger pumps, progressive cavity pumps, diaphragm pumps, recessed impeller
pumps, and rotary lobe pumps. Selection or deselection of a tailoring option
will include or exclude that option in the section, but editing the resulting
section to fit the project is still required.
PART 1 GENERAL
NOTE: This specification guide covers pumps for domestic sewage and sludge.
Industrial wastewater and sludge may require special consideration and design.
Refer to UFC 3-240-08FA and consult the published data of representative manufacturers
and the Hydraulics Institute. Pneumatic ejectors are specified in Section
22 13 36 PNEUMATIC SEWAGE EJECTORS. The following are the types of pumps included
and the general uses:
a. Centrifugal solids handling pumps have high head (up to 69 m (225 feet))
and high capacity (up to 2840 L/second (45,000 gpm)) capabilities and high efficiency
relative to other solids handling pumps. They are ideal for sewage applications.
b. Submersible centrifugal pumps have high head (up to 55 m (180 feet)) and
high capacity (up to 1390 L/second (22,000 gpm)) capabilities but are less efficient
than standard centrifugal pumps. They have higher operating costs but lower
installation costs than standard centrifugal pumps. They are ideal for sewage
and low concentration sludge applications.
c. Self-priming centrifugal pumps have moderate head (up to 31 m (100 feet))
and moderate capacity (up to 158 L/second (2,500 gpm)) capabilities and are
less efficient than standard centrifugal pumps. They have higher operating
costs but lower installation costs than standard centrifugal pumps. They are
ideal for raw sewage applications where occasional service interruptions are
acceptable.
d. Screw pumps have low head (up to 9 m (30 feet)) and high capacity (up to
5050 L/second (80,000 gpm)) capabilities and are relatively efficient (70 to
75 percent). They are ideal for raw sewage, storm water, and activated sludge
lift stations.
e. Plunger pumps have high head 76 to 92 m (250 to 300 feet) and moderate capacity
(up to 35 L/second (550 gpm)) capabilities. They are ideal for sludges of various
consistencies.
f. Progressive cavity pumps have high head (up to 54 m (175 feet) per stage)
and moderate capacity (up to 35 L/second (500 gpm)) capability. They may not
perform well under abrasive conditions.
g. Diaphragm pumps have low head (up to 8 m (25 feet) static head) and low
capacity (up to 10 L/second (150 gpm)) capabilities. They are ideal for pumping
primary sludges and corrosives, abrasives, and slurries to 75 percent solids.
h. Recessed impeller pumps have high head (up to 69 m (225 feet)) and high
capacity (up to 316 L/second (5,000 gpm)) capabilities. They are ideal for
sludges up to 4 percent solids and possibly as high as 5 percent solids.
i. Rotary lobe pumps have high head (up to 107 m (350 feet)) and moderate capacity
(up to 95 L/second (1500 gpm)) capabilities. They are ideal for sludges of
various consistencies.
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA)ABMA 11(1990; R 1999) Load Ratings and Fatigue Life for Roller BearingsABMA 9(1990; R 2000) Load Ratings and Fatigue Life for Ball Bearings][ASME INTERNATIONAL (ASME)ASME B40.100(2005) Pressure Gauges and Gauge Attachments][ASTM INTERNATIONAL (ASTM)ASTM A 153/A 153M(2005) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA ICS 1(2000; R 2005; R 2008) Standard for Industrial Control and Systems General RequirementsNEMA MG 1(2007; Errata 2008) Standard for Motors and Generators][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition]1.2 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are for [Contractor Quality Control approval.][information only. When used, a designation following the "G"
designation identifies the office that will review the submittal for the Government.] The following shall be
submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Equipment Installation[; G][; G, [_____]]
Drawings containing complete wiring and schematic diagrams and any other details required
to demonstrate that the system has been coordinated and will properly function as a unit. Show
on the Drawings proposed layout and anchorage of equipment and appurtenances, and equipment
relationship to other parts of the work including clearances for maintenance and operation.
SD-03 Product Data
Materials and Equipment
Framed Instructions
Pump characteristic curves showing capacity in gpm, net positive suction head (NPSH), head,
efficiency, and pumping horsepower from 0 gpm to 110 percent (100 percent for positive displacement
pumps) of design capacity. A complete list of equipment and material, including manufacturer's
descriptive data and technical literature, performance charts and curves, catalog cuts, and
installation instructions. Diagrams, instructions, and other sheets proposed for posting.
Spare Parts
Spare parts data for each different item of material and equipment specified.
SD-06 Test Reports
Field Testing and Adjusting Equipment
Performance test reports in booklet form showing all field tests performed to adjust each
component and all field tests performed to prove compliance with the specified performance criteria,
upon completion and testing of the installed system. In each test report indicate the final
position of controls.
SD-10 Operation and Maintenance Data
Operating and Maintenance Manuals[; G][; G, [_____]]
[Six] [_____] copies of operation and [six] [_____] copies of maintenance manuals for the
equipment furnished. One complete set prior to performance testing and the remainder upon acceptance.
Operation manuals shall detail the step-by-step procedures required for system startup, operation,
and shutdown. Include in the operation manuals the manufacturer's name, model number, parts
list, and brief description of all equipment and their basic operating features. List in the
maintenance manuals routine maintenance procedures, possible breakdowns and repairs, and troubleshooting
guides. Maintenance manuals shall include piping and equipment layout and simplified wiring
and control diagrams of the system as installed. Manuals shall be approved prior to the field
training course.
1.3 DELIVERY, STORAGE, AND HANDLING
Protect from the weather, excessive humidity and excessive temperature variation; and dirt, dust, or other contaminants
all equipment delivered and placed in storage.
1.4 EXTRA MATERIALS
Submit spare parts data for each different item of material and equipment specified, after approval of the related
submittals, and not later than [_____] months prior to the date of beneficial occupancy. Include in the data
a complete list of parts and supplies, with current unit prices and source of supply
PART 2 PRODUCTS
2.1 MATERIALS AND EQUIPMENT
Provide materials and equipment which are the standard products of a manufacturer regularly engaged in the manufacture
of such products and that essentially duplicate items that have been in satisfactory use for at least 2 years
prior to bid opening. Equipment shall be supported by a service organization that is, in the opinion of the
Contracting Officer, reasonably convenient to the site. Pump casings shall be constructed of cast iron of uniform
quality and free from blow holes, porosity, hard spots, shrinkage defects, cracks, and other injurious defects.
Impellers shall be [cast iron] [ductile iron] [unless otherwise specified for rotors].
2.1.1 Nameplates
Provide each major item of equipment with the manufacturer's name, address, type or style, model or serial number,
and catalog number on a plate secured to the item of equipment.
2.1.2 Equipment Guards
Enclose or guard belts, pulleys, chains, gears, projecting setscrews, keys, and other rotating parts so located
that any person may come in close proximity thereto.
2.1.3 Special Tools
Provide one set of special tools, calibration devices, and instruments required for operation, calibration, and
maintenance of the equipment.
2.1.4 Electric Motors
Motors shall conform to NEMA MG 1.
2.1.5 Motor Controls
Controls shall conform to NEMA ICS 1.
2.1.6 Bolts, Nuts, Anchors, and Washers
Bolts, nuts, anchors, and washers shall be steel; galvanized in accordance with ASTM A 153/A 153M.
2.1.7 Pressure Gauges
Compound gauges shall be provided on the suction side of pumps and standard pressure gauges on the discharge
side of pumps. Gauges shall comply with ASME B40.100. Gauge ranges shall be as appropriate for the particular
installation.
2.1.8 Seal Water Systems
NOTE: Alternate seal water systems utilize filtered effluent recirculated back
to pump seals as water supply. Consult water seal manufacturers for details.
Delete entire paragraph if seal water not specified for pumps.
Pumping systems requiring seal water shall utilize [potable] [_____] water. A package seal water system, consisting
of a [189 L 50 gallon] [_____] galvanized tank, float valve mounted directly on the tank, and 2 centrifugal pumps
of equal capacity, with close coupled motors, shall be factory assembled and supplied as a single self-contained
unit.
2.1.8.1 Float Valve
The float valve shall be mounted on the tank to maintain a water level below an overflow provided near the top
of the tank and to maintain a 152 mm 6 inch air gap between the water system and the top of the tank.
2.1.8.2 Auxiliary Equipment
Auxiliary equipment required to complete the system shall be as indicated and shall include the necessary piping,
valving, pressure gauges, pressure regulators, pressure switches, solenoid valves, strainers, and accessories.
2.1.8.3 Controls
The solenoid valve shall open whenever the process pump motor is energized. The pressure switch shall signal
an alarm and stop the process pump whenever the seal pressure is below a set point. The pressure regulating
valve shall be located on a bypass line back to the seal water reservoir tank. The pressure switch and pressure
regulating valve set points shall be determined by the process pump manufacturer. A valved bypass around each
solenoid valve shall also be provided.
2.1.8.4 System Characteristics
NOTE: Insert data for each seal water system required. Repeat paragraph as
necessary for seal water systems with different characteristics.
The seal water systems for pump number[s] [_____] shall be sized for [_____] L/second gpm at [_____] kPa psi
and [_____] W horsepower.
2.2 CENTRIFUGAL SOLIDS HANDLING PUMPS
Centrifugal solids handling pumps shall be of the nonclogging centrifugal type designed to pump solids up to
76 mm 3 inches in diameter and which provide no internal interstices that catch solids and stringy materials
to cause clogging.
2.2.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Design Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
c. Maximum Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
d. Minimum Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
e. Impeller Type: [_____].
f. Operating Speed: [_____] rpm.
g. Maximum NPSH Required at Maximum Operating Point: [_____].
h. Motor Type: [_____].
i. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
j. Size: Within rated load driving pump at specified rpm.
k. Pump Control: [_____].
2.2.2 Pump Casing
Pump casing shall be constructed with tapped and plugged holes for venting and draining the pump. The casing
shall be capable of withstanding pressures 50 percent greater than the maximum operating pressure. The volute
shall have smooth passages. The casing shall be such that the impeller can be removed without disturbing the
suction and discharge connections. The casing shall have a handhole to permit inspection and cleaning of the
pump interior. Lifting eyes shall be provided to facilitate handling of the pump.
2.2.3 Impeller
The impeller shall be designed with smooth passages to prevent clogging and pass stringy or fibrous materials.
The impeller shall be statically, dynamically, and hydraulically balanced within the operating range and to the
first critical speed at 150 percent of the maximum operating speed. The impeller shall be securely keyed to
the shaft with a locking arrangement whereby the impeller cannot be loosened by torque from either forward or
reverse direction.
2.2.4 Wearing Rings
Renewable wearing rings shall be provided on the impeller and casing and shall have wearing surfaces normal to
the axis of rotation. Wearing rings shall be constructed of [steel] [cast iron]. Wearing rings shall be designed
for ease of maintenance and shall be secured to prevent rotation. Replaceable steel wear plates fastened to
casing may be used in lieu of wearing rings on casing and impeller.
2.2.5 Pump Shaft
Pump shaft shall be of stainless or high grade alloy steel and shall be of adequate size and strength to transmit
the full driver horsepower with a liberal safety factor.
2.2.6 Pump Shaft Sleeve
The pump shaft shall be protected from wear by a stainless steel, high grade alloy steel, or bronze shaft sleeve.
The joint between the shaft and sleeve shall be sealed to prevent leakage.
2.2.7 Stuffing Box
The stuffing box shall be of the same material as the casing and shall be [grease] [or] [water] sealed. The
stuffing box shall be designed for a minimum of five rings of packing and shall have easily removable split type
glands.
2.2.8 Mechanical Seals
NOTE: Specify double mechanical seals in high pressure applications.
[Single] [Double] mechanical seals shall be provided to seal the pump shaft against leakage. Each seal interface
shall be held in contact by its own spring system, supplemented by external liquid pressures. The seal system
shall be constructed to be readily removable from the shaft.
2.2.9 Bearings
Pump bearings shall be ball or roller type designed to handle all thrust loads in either direction. Pumps depending
only on hydraulic balance end thrust will not be acceptable. Bearings shall have an ABEMA L-10 life of 50,000
hours minimum, as specified in ABMA 9 or ABMA 11.
2.2.10 Lubrication
NOTE: Delete the inapplicable types of lubrication. Normally use grease for
vertical shaft pumps. Use either grease or oil for horizontal shaft pumps.
Bearings shall be [oil bath] [or] [grease] lubricated. [An oil reservoir shall be provided for oil bath lubricated
bearings. The reservoir shall have an overflow opening to prevent overfilling and shall have a drain at the
lowest point.] [A grease fitting shall be provided for grease-lubricated bearings. The grease fitting shall
be of the type that prevents overlubrication and the building up of pressure injurious to the bearings. If the
grease fitting is not easily accessible, grease tubing shall be provided to a convenient location.]
2.2.11 Pump Support
NOTE: Delete inapplicable types of support.
Horizontal centrifugal pumps shall be provided with a common base plate for the pump and motor. Vertical shaft
centrifugal pumps shall be provided with separate bases for the pump and motor. Vertical dry pit centrifugal
pumps shall be supported by a heavy cast iron base with adequate legs to provide maximum rigidity and balance.
2.2.12 Coupling
NOTE: Delete inapplicable types of couplings.
Couplings shall be of the heavy-duty flexible type, keyed or locked to the shaft. Disconnecting of the coupling
shall be possible without removing the driver half or the pump half of the coupling from the shaft. Couplings
for extended shaft vertical centrifugal pumps may be of the universal type.
2.3 SUBMERSIBLE CENTRIFUGAL PUMPS
Submersible centrifugal pumps shall be centrifugal type pumps designed to pump solids up to 76 mm 3 inches in
diameter and shall be capable of withstanding submergence as required for the particular installation.
2.3.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Design Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
c. Maximum Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
d. Minimum Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
e. Impeller Type: [_____].
f. Operating Speed: [_____] rpm.
g. Depth of Submergence: [_____] mm feet.
h. Motor Type: [_____].
i. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
j. Size: Within rated load driving pump at specified rpm.
k. Pump Control: [_____].
2.3.2 Pump Casing
The casing shall be capable of withstanding operating pressures 50 percent greater than the maximum operating
pressures. The volute shall have smooth passages which provide unobstructed flow through the pump.
2.3.3 Mating Surfaces
Mating surfaces where watertight seal is required, including seal between discharge connection elbow and pump,
shall be machined and fitted with nitrile rubber O-rings. Fitting shall be such that sealing is accomplished
by metal-to-metal contact between mating surfaces, resulting in proper compression of the O-rings without the
requirement of specific torque limits.
2.3.4 Coatings
Exterior surfaces of the casing in contact with sewage shall be protected by a sewage resistant coal tar epoxy
coating. All exposed nuts and bolts shall be stainless steel.
2.3.5 Impeller
The impeller shall be of the [single] [double] shrouded non-clogging design to minimize clogging of solids, fibrous
materials, heavy sludge, or other materials found in sewage. The impeller shall be statically, dynamically,
and hydraulically balanced within the operating range and to the first critical speed at 150 percent of the maximum
operating speed. The impeller shall be securely keyed to the shaft with a locking arrangement whereby the impeller
cannot be loosened by torque from either forward or reverse direction.
2.3.6 Wearing Rings
Wearing rings, when required, shall be renewable type and shall be provided on the impeller and casing and shall
have wearing surfaces normal to the axis of rotation. Material for wear rings shall be standard of pump manufacturer.
Wearing rings shall be designed for ease of maintenance and shall be adequately secured to prevent rotation.
2.3.7 Pump Shaft
The pump shaft shall be of high grade alloy steel and shall be of adequate size and strength to transmit the
full driver horsepower with a liberal safety factor.
2.3.8 Seals
NOTE: Do not specify ceramic seals where sudden changes in temperature can
occur and cause the seal to crack. Tungsten carbide seals are standard for
many manufacturers. Delete last sentence if conventional seals are acceptable.
A tandem mechanical shaft seal system running in an oil bath shall be provided. Seals shall be of [_____] with
each interface held in contact by its own spring system. [Conventional mechanical seals which require a constant
pressure differential to effect sealing will not be allowed.]
2.3.9 Bearings
Pump bearings shall be ball or roller type designed to handle all thrust loads in either direction. Pumps depending
only on hydraulic balance end thrust will not be acceptable. Bearings shall have an ABEMA L-10 life of 50,000
hours minimum, as specified in ABMA 9 or ABMA 11.
2.3.10 Motor
The pump motor shall have Class F insulation, NEMA B design, in accordance with NEMA MG 1, and shall be watertight.
The motor shall be either oil filled, air filled with a water jacket, or air filled with cooling fins which encircles
the stator housing.
2.3.11 Power Cable
NOTE: Last sentence may eliminate several manufacturers. However, this requirement
may be needed for protection of motor and to reduce maintenance costs. Evaluate
for each specific pump application.
The power cable shall comply with NFPA 70, Type SO, and shall be of standard construction for submersible pump
applications. The power cable shall enter the pump through a heavy duty entry assembly provided with an internal
grommet assembly to prevent leakage. The cable entry junction chamber and motor shall be separated by a stator
lead sealing gland or terminal board which shall isolate the motor interior from foreign material gaining access
through the pump top. [Epoxies, silicones, or other secondary sealing systems are not acceptable.]
2.3.12 Installation Systems
NOTE: In following three paragraphs, delete inapplicable installation systems.
2.3.12.1 Rail Mounted Systems
Rail mounted installation systems shall consist of guide rails, a sliding bracket, and a discharge connection
elbow. Guide rails shall be of the size and type standard with the manufacturer and shall not support any portion
of the weight of the pump. The sliding guide bracket shall be an integral part of the pump unit. The discharge
connection elbow shall be permanently installed in the wet well along with the discharge piping. The pump shall
be automatically connected to the discharge connection elbow when lowered into place and shall be easily removed
for inspection and service without entering the pump well.
2.3.12.2 Bolt Down Systems
The pump mount system shall include a base designed to support the weight of the pump. The base shall be capable
of withstanding all stresses imposed upon it by vibration, shock, and direct and eccentric loads.
2.3.12.3 Lifting Chain
Lifting chain to raise and lower the pump through the limits indicated shall be provided. The chain shall be
galvanized and shall be capable of supporting the pump.
2.4 SELF-PRIMING CENTRIFUGAL PUMPS
Self-priming centrifugal pumps shall be designed to pump solids up to 76 mm 3 inches in diameter and shall be
of the centrifugal type capable of repeated reprime when handling trash-laden sewage.
2.4.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Design Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
c. Maximum Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
d. Minimum Operating Point: [_____] L/second gpm flow, [_____] mm feet head, [_____] percent
efficiency.
e. Maximum Priming Lift: [_____] mm feet.
f. Maximum Reprime Lift: [_____] mm feet.
g. Impeller Type: [_____].
h. Rotation Direction: [Clockwise] [Counterclockwise].
i. Operating Speed: [_____] rpm (maximum).
j. Motor Type: [_____].
k. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
l. Size: Within rated load driving pump at specified rpm.
m. Pump Control: [_____].
2.4.2 Pump Casing
The casing shall be capable of withstanding pressures 50 percent greater than the maximum operating pressures.
The pump casing shall contain no openings of smaller diameter than the specified sphere size. There shall be
no internal devices that will inhibit maintenance or interfere with priming and performance. The pump shall
be designed to retain sufficient liquid in the casing to ensure unattended operation. The casing shall be such
that the impeller can be removed without disturbing the suction and discharge connections. Front access shall
be provided to the pump interior to permit inspection and cleaning of the pump interior without removing suction
or discharge piping.
2.4.3 Impeller
The impeller shall be of the two-vane, semi-open, non-clog type with pump-out vanes cast integrally on its backside.
The impeller shall be statically, dynamically, and hydraulically balanced within the operating range and to the
first critical speed at 150 percent of the maximum operating speed. The impeller shall be securely keyed to
the shaft with a locking arrangement whereby the impeller cannot be loosened by torque from either forward or
reverse direction.
2.4.4 Wear Plate
NOTE: Steel is standard with most manufacturers.
A replaceable wear plate constructed of [cast iron] [alloy steel] shall be provided.
2.4.5 Pump Shaft
Pump shaft shall be of high grade alloy steel or stainless steel and shall be of adequate size and strength to
transmit the full driver wattage horsepower with a liberal safety factor.
2.4.6 Pump Shaft Sleeve
The pump shaft shall be protected from wear by a high grade alloy steel or stainless steel shaft sleeve. A seal,
if needed, shall be placed between the shaft and sleeve to prevent leakage.
2.4.7 Seals
The pump shaft shall be sealed against leakage by [oil lubricated] [water lubricated] mechanical seal. The stationary
sealing member shall be [tungsten carbide] [silicon carbide] and the rotating member shall be [tungsten carbide]
[silicon carbide]. The seal shall be such that the faces will not lose alignment during shock loads that cause
deflection, vibration, and axial or radial movement of the pump shaft.
2.4.8 Bearings
Pump bearings shall be ball or roller type designed to handle all thrust loads in either direction.
2.4.9 Lubrication
NOTE: Delete the inapplicable types of lubrication. Normally use grease for
vertical shaft pumps. Use either grease or oil for horizontal shaft pumps.
Bearings shall be [oil bath] [or] [grease] lubricated. [An oil reservoir for oil bath lubricated bearings shall
be provided. The reservoir shall have an overflow opening to prevent overfilling and shall have a drain at the
lowest point.] [A grease fitting shall be provided to add grease for grease-lubricated bearings. The grease
fitting shall be of the type that prevents overlubrication and the building up of pressure injurious to the bearings.
If the grease fitting is not easily accessible, grease tubing to a convenient location shall be provided.]
2.4.10 Suction Check Valve
NOTE: If the pump is in an application where a high degree of reliability is
desired, retain the last sentence.
The pump shall contain a suction check valve to maintain prime. The suction check valve shall be removable without
disturbing the suction piping. [The pump shall be capable of prime or reprime in the event of check valve failure.]
2.4.11 Pump Support
A common fabricated steel base plate shall be provided for the pump and motor.
2.4.12 Coupling
NOTE: Delete inapplicable type of couplings.
Power shall be transmitted from the motor to the pump by a [flexible coupling] [V-belt drive assembly]. [Flexible
couplings shall be of the heavy duty type, keyed or locked to the shaft.] [The V-belt drive assembly shall have
a minimum of two belts. The drive assembly shall be selected on the basis of the power to be transmitted from
the motor to the pump. The drive shall be enclosed on all sides by a solid metal guard.]
2.5 SCREW PUMPS
NOTE: Edit paragraph for enclosed or tube mounted screw pumps. Tube mounted
screw pumps do not require concrete trough.
Screw pumps shall have a spiral flight screw operating in a concrete trough with the screw rotation elevating
the liquid up the inclined trough. The pump shall consist of a lower bearing assembly, a spiral screw with deflectors,
an upper bearing assembly, a drive assembly, and an automatic grease lubricated system for the lower bearing.
2.5.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following characteristics:
a. Pump Service: [_____]
b. Total Lift: [_____] mm feet.
c. Angle of Inclination: [22] [30] [38] [_____] degrees from horizontal.
d. Spiral Screw Diameter: [_____] mm feet [_____] inches.
e. Flight Thickness: [_____] mm inches.
f. Quantity of Flights: [1] [2] [3]
g. Design Capacity: [_____] L/second gpm.
h. Tube Diameter: [_____] mm feet [_____] inches.
i. Screw Speed: [_____] rpm
j. Motor Type: [_____]
k. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
l. Size: Within rated load driving pump at specified rpm.
m. Pump Control: [_____].
2.5.2 Lower Bearing Assembly
The lower bearing assembly shall be sleeve or roller bearing type design. If sleeve bearing is utilized, either
the bronze phosphor sleeve shall rotate around stationary shaft or shaft shall be attached to bronze bushing
which rotates inside stationary cartridge. Sleeve bearing shall be hermetically sealed, automatic grease lubricated.
Roller bearings shall be oil lubricated and designed to guard against oil leakage. Labyrinth arrangement shall
protect fire seal from damage. Bearings shall have L-10 life of 100,000 hours. The bearing housing shall permit
precise adjustment in the field. A spare lower bearing assembly shall be provided.
2.5.2.1 Seals
Contaminants shall be prevented from entering the bearing by two spring-loaded lipseals, one to exclude wastewater
and contaminants and one to retain the grease in the bearing, or by a fixed journal with hollow axis to allow
grease to the top end of the bearing where it flows the length of the bearing sealing out contaminants.
2.5.2.2 Bearing Shield
A heavy-duty bearing shield shall be provided to protect the bearing assembly from heavy debris.
2.5.3 Spiral Screw
The spiral screw shall consist of a steel torque tube with steel flights welded to the exterior of the tube,
a drive shaft, and lower stub shaft.
2.5.3.1 Torque Tube
The torque tube shall be sealed at both ends with welded steel plates. Care shall be taken to insure that the
end plates are parallel after welding. The flights shall be continuously welded to the tube on both sides.
The drive shaft and lower stub shaft shall be bolted to the torque tube ends with a registered fit to ensure
axial alignment of the tube and shafting.
2.5.3.2 Shafts
The upper and lower shafts and the outside diameter of the flights of the completed spiral screw shall have the
same axis. The maximum deflection at midspan shall not exceed 4 mm 5/32 inch when calculated as a uniformly
loaded horizontal simple beam supported between the upper and lower bearings. The completed spiral screw shall
be statically balanced.
2.5.4 Flow Defector Plates
NOTE: Deflector plates may be extended to completely enclose pump or pump may
be tube mounted.
Flow deflector plates shall be provided for installation in the pump trough along the uptake side of the spiral
screw for the full length of the spiral. The deflector plates shall be concave to effect an extension of the
circular arch of the trough to at least the height of the top surface of the torque tube. The deflector plates
shall be fabricated from not less than 3 mm 1/8 inch thick steel plate and shall be complete with stiffeners
and anchors where required.
2.5.5 Upper Bearing Assembly
The upper bearing assembly shall consist of an upper bearing housing, bearing, seals, mounting, and cover.
2.5.5.1 Housing
The upper bearing housing shall be cast iron and shall have grease fittings on the exterior of the housing for
periodic manual lubrication.
2.5.5.2 Bearing
The upper bearing shall have an ABEMA L-10 life of 50,000 hours minimum, as specified in ABMA 9 or ABMA 11, and
shall be one of the following: a dual bearing consisting of a spherical roller thrust type bearing for pump
thrust loads and a spherical roller bearing for radial loads; or a single combination radial and thrust, self-aligning,
spherical roller bearing.
2.5.5.3 Seals
Two seals shall be provided for protection of the upper bearings. One seal shall be attached to the extended
shaft of the spiral screw to prevent contamination from entering the bearing top side. The other seal shall
be on the bottom side to retain the grease within the bearing.
2.5.5.4 Mounting Plate
A fabricated steel mounting plate and anchor bolts shall be provided for mounting the upper bearing assembly.
2.5.5.5 Cover
A fabricated steel cover shall be provided to close the opening in the wall for the spiral shaft.
2.5.6 Drive Assembly
The drive assembly shall consist of a motor, gear reducer, and backstop.
2.5.6.1 Gear Reducer
The gear reducer shall have the torque rating for the spiral speed based upon continuous operation with a uniform
load. The gear reducer shall have an outer cast iron housing, totally enclosed and rigidly constructed to maintain
precise alignment of the gears and bearings. The gear reducer shall be designed with a service factor of not
less than [_____] based on the torque requirements of the screw or [_____] based on the motor horsepower, whichever
is greater. Gears and bearings shall be splash lubricated or, if necessary, pressure lubricated to ensure oil
is provided to all gears and bearings. Shaft-mounted gear reducers shall be positively secured to the screw
shaft and shall have a torque arm anchored to the floor. Double lip oil seals shall be provided on the shaft.
Non-shaft-mounted gear reducers shall be provided with an adjustable base and shall be connected to the screw
shaft by a flexible coupling.
2.5.6.2 Backstop
A backstop shall be provided to prevent the reverse rotation of the spiral screw and drive assembly when the
power to the motor is disconnected.
2.5.6.3 Drive
The gear reducer shall be connected to the drive motor by means of belts and sheaves designed with the same service
factor as the gear reducer. A safety cover shall be provided for the belt drive.
2.5.7 Lubrication System
An automatic grease lubricator with grease pump and reservoir shall be provided to continuously grease the lower
bearing when the pump is operating. The grease pump shall have a [_____] W hp, [_____] volts ac, [_____] phase,
[60] [_____] Hz motor. The grease pump shall be interlocked with the screw pump motor to prevent the screw pump
from operating if the lubricator malfunctions. A visual or automatic indicator shall be provided to confirm
that the lower bearing is receiving grease from the lubrication system.
2.5.8 Radius Screed
Provide a radius screed and any additional sheaves and belts as necessary to adjust screw speed to enable the
installation of the grout in the trough with the screw installed.
2.6 PLUNGER PUMPS
Plunger pumps shall be of the positive displacement type designed to pump sewage sludges with a minimum amount
of clogging.
2.6.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Design Capacity: [_____] L/second gpm.
c. Design Head: [_____] mm feet.
d. Suction Lift: [_____] mm feet.
e. Stroke Speed: [_____] strokes per minute.
f. Pump Type: [simplex] [duplex] [triplex] [quadraplex].
g. Motor Type: [_____].
h. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
i. Size: Within rated load driving pump at specified rpm.
j. Pump Control: [_____].
2.6.2 Pump Base
A common, welded steel, drip-rim base with a 25 mm 1-inch threaded drain connection shall be provided for the
pump and motor. The base shall be of heavy section, fully braced to withstand all shock loads and to resist
buckling when properly anchored.
2.6.3 Pump Body
The pump body shall be cast iron. The pump shall be of heavy construction, designed to handle its maximum rated
capacity and head on a continuous duty basis and shall be hydrostatically tested at 1.5 times the maximum rated
head of the pump. The pump body shall be of sectional construction so that the stuffing box, valve bodies, and
air chamber adapters are independently removable. The construction shall permit removal of the stuffing box,
plunger, and connecting rod without disturbing the body, valve chambers, manifolds, piping, or shaft.
2.6.4 Valves
Valve chambers shall be provided on both the inlet and discharge connections of each cylinder. The valve chambers
shall be constructed with contoured interiors to minimize clogging. Valves shall be ball type, at least 130
mm 5-1/8 inches in diameter, and constructed of neoprene. Valve seats shall be independent, fully machined plates
which may be replaced without disturbing valve bodies or piping.
2.6.5 Connecting Rod, Eccentric, Eccentric Bearings, and Shaft
The connecting rod and eccentric strap assembly shall be cast as one piece and shall have a quality hot-poured
Babbitt lining. The eccentric, bearings, and shaft shall be designed to handle the stresses and deflections
imposed upon it by the specified service. [The shaft shall be offset from the vertical centerline of the cylinder
by an amount appropriate to the cylinder diameter to reduce lateral thrust on the cylinder during the discharge
stroke.]
2.6.6 Plungers
Plungers shall be ductile iron and shall have a plugged drain hole in the bottom which shall be accessible through
the top of the plunger.
2.6.7 Cylinders
Cylinders shall be machined to a smooth bore to provide a uniform surface throughout the full travel of the plunger.
2.6.8 Stuffing Box
The cylinder and plunger shall have an effective packing arrangement to provide lubrication for the plunger and
maintain the most effective vacuum. The stuffing box shall be of heavy cast construction and shall be provided
with a circular drain lip and 25 mm 1 inch threaded drain connection. The stuffing box shall be provided with
a minimum of four rings of [_____] packing.
2.6.9 Air Chambers
NOTE: Generally provide air chambers on suction side of all pumps and always
on discharge side of all pumps.
Air chambers shall be provided on [the discharge side] [both suction and discharge sides] of the pump. Air chambers
shall have a minimum capacity of 0.0295 cubic meters 1800 cubic inches and a minimum 76 mm 3 inch diameter opening.
2.6.10 Sampling Valve
A 50 mm 2 inch sampling valve shall be provided on the discharge side of the pump.
2.6.11 Pressure Relief Valve
A pressure relief valve shall be provided with a bypass line from the main suction and discharge manifolds.
The valve shall be factory set to prevent motor overload or pump damage.
2.6.12 Lubrication
Each pump eccentric shall be provided with a sight-feed oil lubricator.
NOTE: Delete inapplicable drive systems. The gear reducer is recommended for
11.2 kW (15 hp) and larger applications.
2.6.13 Chain Drive
Capacity variations shall be provided by stroke adjustment accomplished at each eccentric assembly, through the
use of eccentric flanges coupled to the eccentric body. Overall drive reduction shall be obtained through the
combination of a gearhead motor and silent roller chain. Motor gearhead shall be totally enclosed and running
in oil. Chain capacity shall be at least 150 percent of the chain manufacturers published horsepower rating.
The entire chain drive assembly shall be completely enclosed in a sealed lip, dust resistant steel guard.
2.6.14 V-Belt and Integral Gear Drive
Capacity variations shall be provided by stroke adjustment accomplished at each eccentric assembly, through the
use of eccentric flanges coupled to the eccentric body. Overall drive reduction shall be obtained through a
combination of gears and V-belts. Gears shall run in an oil bath contained in an oil-tight cast iron or aluminum
enclosure. The gear reduction design, gear materials and face widths, shafting, and bearings shall be selected
for the specified operating conditions. The entire V-Belt drive assembly shall be covered by a rigid safety
guard.
2.6.15 Gear Reducer Drive
Capacity variations shall be provided by pump speed change only. The low speed shaft of the reducer shall be
directly connected to the main shaft of the pump through a flexible coupling with shear pin protection. The
shear pin overload protection shall be designed for release at 150 percent to 175 percent of normal torque.
The high speed shaft of the reducer shall be connected to the motor by a heavy duty flexible coupling. The entire
gear reduction unit shall be enclosed in a dustproof and oil-tight housing.
2.7 PROGRESSIVE CAVITY PUMPS
NOTE: For sludges of solids concentration exceeding 18 percent, installation
of bridge breaker on the inlet port should be investigated. Designs vary and
manufacturer's specifications should be consulted.
Progressive cavity pumps shall consist of a single helical rotor rotating in a double helical stator.
2.7.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Design Capacity: [_____] L/second gpm maximum to [_____] L/second gpm minimum.
c. Operating Head: [_____] mm feet maximum to [_____] mm feet minimum.
d. Operating Speed: [_____] rpm.
e. [Single] [Double] stage.
f. Motor Type: [_____].
g. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
h. Size: Within rated load driving pump at specified rpm.
i. Pump Control: [_____].
2.7.2 Casing
[The pump body shall be cradle mounted such that the suction chamber can be rotated to allow the suction port
to accommodate any piping configuration.] Two inspection ports shall be incorporated 180 degrees apart in the
suction housing to provide access to internal parts. A drain plug shall be provided in the casing.
2.7.3 Rotor
NOTE: Tool steel and stainless steel are common rotor materials. Other materials
are also available. Chrome plating is standard for most manufacturers but may
be deleted, depending upon the application.
The pump rotor shall be a helix constructed of machined and polished [high quality tool steel] [stainless steel]
[and shall be covered with a layer of hard chrome plate].
2.7.4 Stator
The rotor shall revolve in a helix elastomeric stator consisting of Buna-N chemically bonded to a steel tube.
2.7.5 Drive Shaft and Connecting Rod
NOTE: Universal joint design is critical since this is a common problem area
for this type pump. The pin or cardan type joints are inferior to the gear
type but may be acceptable for some applications. Deleting the pin or cardan
type joints will eliminate many manufacturers.
The rotor shall be driven by a connecting rod between the rotor and drive shaft, connected at each end with a
crowned gear [or pin or cardan] type universal joint. The universal joints shall be of adequate design to transmit
the required thrust and torque. The connecting rod and universal joint in combination shall impart no thrust
on the seal. Universal joints shall be [grease] [_____] lubricated and totally sealed and shielded. The seal
shall prevent liquid from contaminating the joints, and the shields shall prevent foreign objects from damaging
the seal.
2.7.6 Flexible Drive Shaft
NOTE: The spring steel flexible one-piece drive shaft is proprietary and should
not be specified alone.
The rotor shall be driven by a one-piece, flexible, high strength spring steel drive shaft with a corrosion and
abrasion-resistant thermoplastic coating.
2.7.7 Seals
Pump seals shall be a stuffing box with a split packing gland and lantern ring or shall be a mechanical seal.
Fittings for [grease] [water] lubrication shall be provided.
2.7.8 Bearings
Bearings shall be designed for an ABEMA L-10 life of at least 50,000 hours minimum, as specified in ABMA 9 or
ABMA 11, and shall be grease lubricated. Lubrication fittings in the bearing housing shall be provided.
2.8 DIAPHRAGM PUMPS
Diaphragm pumps shall be of the self-priming, positive displacement type designed to pump sludge of various concentrations
and levels of abrasiveness. The pump shall be designed such that operating the pump without liquid in the pump
casing will not damage any portion of the pump.
2.8.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Operator: [mechanical] [air].
c. Peak Capacity: [_____] L/second gpm flow.
d. Total Dynamic Head: [_____] mm feet.
e. Suction and Discharge Check Valve Size: [_____] mm inches.
f. Pump Speed: [_____] strokes per minute.
g. Diaphragm Material: [_____].
h. Motor Type: [_____].
i. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
j. Size: Within rated load driving pump at specified strokes per minute.
k. Pump Control: [_____].
2.8.2 Casing
All interior wetted parts shall be lined with [6.4 mm 1/4 inch thick chlorosulfonated polyethylene]. The pump
body shall be designed to permit access to the casing interior without disassembling the suction and discharge
piping.
2.8.3 Suction and Discharge Check Valves
NOTE: Specify the appropriate type of valve for the material to be pumped.
If large, pipe-size solids are to be pumped, specify the flap check valve.
If maintenance will be infrequent, specify the in-line ball check valve. For
other applications specify the quick-opening ball check valve.
The suction and discharge check valves shall be of the [quick opening ball check type,] [in-line ball check type,]
[or] [in-line flap check type]. [Quick-opening ball check valves shall have replaceable [stainless steel,] [bronze,]
[or] [cast iron] seats and an easily removable cover plate to permit inspection and cleaning of the valve interior
without disassembling the adjacent piping.] [In-line ball check valves shall have a streamlined internal design,
eliminating projections on which material can collect.] [In-line flap check valves shall have an elastomeric
seal on the disc to insure sealing and shall have a removable cover to permit inspection and cleaning of the
valve interior without disassembling the adjacent piping.]
2.8.4 Pulsation Dampers
NOTE: Specify inlet pulsation dampers for pumps with high suction head and
discharge pulsation dampers for pumps with high discharge head.
An air chamber type pulsation damper shall be provided on the pump [inlet] [and] [discharge].
2.8.5 Air-Operated Actuators
NOTE: Delete inapplicable drive type, mechanical or air-operated.
A complete air operated actuator shall be provided, with all accessories required for proper operation, including
the following:
2.8.5.1 Valve
A three-way solenoid valve on the air supply line. The valve shall operate on a signal from the flow control
timer.
2.8.5.2 Timer
An adjustable solid state flow control timer to control pump stroke rate and length. Stroke rate shall be adjustable
from 0 to [40] [_____] strokes per minute. Stroke length shall be adjustable from [0.75] [_____] to [1.25] [_____]
seconds.
2.8.5.3 Muffler
An air exhaust muffler to ensure quiet operation.
2.8.5.4 Pressure Regulator
An air pressure regulator to maintain a constant air supply pressure to the pumping system. The air pressure
regulator shall be field adjustable from [_____] to [_____] kPa [_____] to [_____] psi.
2.8.5.5 Strainer
An air supply strainer to remove particles larger than [_____] microns from the air supply. The strainer shall
have a removable cover to permit cleaning without dismantling adjacent piping.
2.8.5.6 Assist
Spring assist or air cylinder assist as required for adequate suction lift.
2.8.6 Mechanical Actuators
The mechanical actuator shall consist of an electric motor and [gear reducer] [belt drive] connected to the diaphragm
by a connecting rod and eccentric.
2.9 RECESSED IMPELLER PUMPS
Recessed impeller pumps shall be of the vortex type designed to handle fluids containing solids, air, and stringy
material normally found in sewage. Pumps shall be designed to pump solids up to 76 mm 3 inches in diameter.
2.9.1 Pump Characteristics
Pump number[s] [_____] located in [_____] shall have the following operating characteristics:
a. Pump Service: [_____].
b. Design Operating Point: [_____] L/second gpm flow at [_____] mm feet head.
c. Maximum Operating Point: [_____] L/second gpm flow at [_____] mm feet head.
d. Minimum Operating Point: [_____] L/second gpm flow at [_____]mm feet head.
e. Discharge Diameter: [_____] mm inches.
f. Suction Diameter: [_____] mm inches.
g. Operating Speed: [_____] rpm.
h. Maximum NPSH Required at Maximum Operating Point: [_____].
i. Seal Type: [packing] [mechanical].
j. Motor Type: [_____].
k. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
l. Size: Within rated load driving pump at specified rpm.
m. Pump Control: [_____].
2.9.2 Pump Casing
Pump casing shall be constructed with tapped and plugged holes for priming, venting, and drainage of the pump.
The casing shall be capable of withstanding pressures 50 percent greater than the maximum operating pressure.
All internal casing clearances shall be equal to the discharge nozzle diameter so that all material that can
pass through the discharge nozzle can pass through the casing. Casing connections shall be flanged.
2.9.3 Impeller
The impeller shall be of the recessed design. The impeller shall be securely keyed to the shaft with a locking
arrangement whereby the impeller cannot be loosened from either forward or reverse direction.
2.9.4 Pump Shaft
NOTE: Specify manufacturer's standard pump shaft material. High grade alloy
steel is standard with most manufacturers.
Pump shaft shall be of [high grade alloy steel] [or] [stainless steel] and shall be sized to provide a minimum
amount of deflection.
2.9.5 Sleeve
NOTE: Specify manufacturer's standard pump shaft sleeve material. Stainless
steel is standard with most manufacturers.
The pump shaft shall be protected throughout the packing area by a removable [stainless steel] [or] [bronze]
sleeve.
2.9.6 Seals
A stuffing box, designed for the interchangeable use of packing or mechanical seals, and suitable for use of
grease, oil, or water as the sealing liquid, shall be provided.
2.9.6.1 Packing
The stuffing box shall be designed to accommodate a minimum of [_____] rings of [graphite] [oil] impregnated
[nonasbestos] [metallic] packing with lantern ring and packing gland. Packing shall be readily removable from
the shaft.
2.9.6.2 Mechanical Seals
Mechanical seals shall be of the [single] [double] type of [carbon-ceramic] [tungsten carbide] construction.
Each seal interface shall be held in place by its own [stainless steel] spring system. The seal system shall
be constructed to be readily removable from the shaft.
2.9.7 Bearings
Pump bearings shall be antifriction ball or roller type bearings designed to carry all radial or thrust loads.
Bearings shall be [grease] [oil] lubricated and shall be contained in dust- and moisture-proof housings. [An
oil reservoir with overflow and drain openings shall be provided.] [A grease fitting of the type that prevents
overlubrication shall be provided. If the grease fitting is not readily accessible, an extension tube shall be
provided.]
2.10 ROTARY LOBE PUMPS
Rotary lobe pumps shall be of the positive displacement type and shall consist of two tri-lobe rotors which draw
product into pockets formed between the rotors and rotor case and push pumped material 180 degrees around the
interior of the contoured rotor case and out through the discharge port.
2.10.1 Pump Characteristics
Pump number[s] located in [_____] shall have the following characteristics:
a. Pump Service: [_____].
b. Design Capacity: [_____] to [_____] L/second [_____] to [_____] gpm.
c. Operating Head: [_____] mm feet maximum to [_____] mm feet minimum.
d. Operating Speed: [_____] rpm.
e. Discharge Diameter: [_____] mm inches.
f. Suction Diameter: [_____] mm inches.
g. Motor Type: [_____].
h. Electrical Characteristics: [_____] volts ac, [_____] phase, [60] [_____] Hz.
i. Size: Within rated load driving pump at specified rpm.
j. Pump Control: [_____].
2.10.2 Casing
Rotor casing shall be constructed of [ductile iron] [cast iron]. The gear casing shall be constructed of cast
iron. A removable end cover shall allow access to tri-rotor elements without need to disturb packing glands,
bearings, suction, or discharge connections.
2.10.3 Rotors
Pump rotors shall be tri-lobe form [profile machined in cast iron] [high quality tool steel encapsulated in urethane]
[stainless steel]. A removable and replaceable wear plate shall be provided between the rotors and rotor case
to protect the rotor case from wear. Rotors shall be located on shafts by positive locking assembly.
2.10.4 Shafts and Sleeves
Shafts shall be of [high grade alloy steel] [_____] fitted with replaceable stainless shaft sleeves where passing
through gland area. Shafts shall be timed in their rotation by zero backlash timing gears keyed to shafts and
running in a separate oil chamber gear case. Seals shall prevent ingress of pumped material into gear case.
2.10.5 Packing Glands
Seals shall be of adjustable packing gland type. Stuffing box glands shall be provided with split lantern rings
for through water flush.
2.10.6 Bearings
NOTE: Specify L-10 life expectancy based on check with manufacturers for actual
pump models under consideration.
Pump shall have heavy duty antifriction roller or ball type bearings for shaft support, with a ABEMA L-10 life
of [40,000] [100,000] hours at maximum operating conditions. Oil seals shall prevent ingress of pumpage into
gear case. A slinger for each shaft shall be provided.
2.11 ELECTRICAL WORK
Provide electrical motor driven equipment specified complete with motors, motor starters, controls and wiring
in accordance with Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Electrical characteristics shall be as specified
or indicated. Motor starters shall be provided complete with thermal overload protection and other appurtenances
necessary for the motor control specified. Manual or automatic control and protective or signal devices required
for the operation specified, and any control wiring required for controls and devices but not shown, shall be
provided.
PART 3 EXECUTION
3.1 EXAMINATION
After becoming familiar with all details of the work, verify all dimensions in the field, and advise the Contracting
Officer of any discrepancy before performing the work.
3.2 EQUIPMENT INSTALLATION
3.2.1 Pump Installation
Install pumping equipment and appurtenances in the position indicated and in accordance with the manufacturer's
written instructions. Provide all appurtenances required for a complete and operating pumping system, including
such items as piping, conduit, valves, wall sleeves, wall pipes, concrete foundations, anchors, grouting, pumps,
drivers, power supply, seal water units, and controls.
3.2.2 Concrete
Concrete shall conform to Section 03 31 00.00 10 CAST-IN-PLACE STRUCTURAL CONCRETE.
3.2.3 Grouting Screw Pump Flow Channel
NOTE: Delete if no screw pumps.
After installation and adjustment of the screw pump, place grout in the flow channel to the configuration and
dimensions indicated and as required to insure a proper fit between the screw pump and flow channel. A radius
screed provided by the pump manufacturer shall be temporarily attached to provide proper clearance between the
screw and the flow channel. The flow channel shall be grouted in strict accordance with the manufacturer's instructions.
3.3 PAINTING
Pumps and motors shall be thoroughly cleaned, primed, and given two finish coats of paint at the factory in accordance
with the recommendations of the manufacturer. Field painting required for ferrous surfaces not finished at the
factory is specified in Section 09 90 00 PAINTS AND COATINGS.
3.4 FRAMED INSTRUCTIONS
Post, where directed, framed instructions containing wiring and control diagrams under glass or in laminated
plastic. Condensed operating instructions, prepared in typed form, shall be framed as specified above and posted
beside the diagrams. Post the framed instructions before acceptance testing of the system.
3.5 FIELD TESTING AND ADJUSTING EQUIPMENT
3.5.1 Operational Test
Prior to acceptance, an operational test of all pumps, drivers, and control systems shall be performed to determine
if the installed equipment meets the purpose and intent of the specifications. Tests shall demonstrate that
the equipment is not electrically, mechanically, structurally, or otherwise defective; is in safe and satisfactory
operating condition; and conforms with the specified operating characteristics. Prior to applying electrical
power to any motor driven equipment, the drive train shall be rotated by hand to demonstrate free operation of
all mechanical parts. Tests shall include checks for excessive vibration, leaks in all piping and seals, correct
operation of control systems and equipment, proper alignment, excessive noise levels, and power consumption.
3.5.2 Retesting
If any deficiencies are revealed during any test, such deficiencies shall be corrected and the tests shall be
reconducted.
3.6 MANUFACTURER'S SERVICES
Provide the services of a manufacturer's representative who is experienced in the installation, adjustment, and
operation of the equipment specified. The representative shall supervise the installation, adjustment, and testing
of the equipment.
3.7 FIELD TRAINING
Provide a field training course for designated operating and maintenance staff members. Training shall be provided
for a total period of [_____] hours of normal working time and shall start after the system is functionally complete
but prior to final acceptance tests. Field training shall cover all of the items contained in the operating
and maintenance manuals.