USACE / NAVFAC / AFCESA / NASA UFGS-32 84 23 (April 2008)
--------------------------
Preparing Activity: USACE Superseding
UFGS-32 84 23 (July 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 32 84 23
UNDERGROUND SPRINKLER SYSTEMS
04/08
NOTE: This guide specification covers the requirements for underground sprinkler
irrigation systems.
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).
PART 1 GENERAL
NOTE: Irrigation system requirements depend upon rainfall factors for the project
area, plant selections, the quality of growth desired, and budgetary constraints.
The area factors will be determined by a registered landscape professional.
Reference is made to UFC 3-210-05FA. While the design of a system with pop-up
heads may be justified in some geographic areas, bubbler type systems may be
required in areas where water conservation methods are being practiced. If
source of water supply is from base water main through a service line and water
meter, determine amount of water available for irrigation system from static
pressure at point of connection to water main. In many cases, water supply
is adequate for short durations only. The amount of water required is determined
from the type of turf to be irrigated, climate, terrain, and soil conditions.
System piping layout, pipe sizes, and selection and spacing of heads and emitters
must provide the required amount of water and complete coverage of the irrigated
areas. Provide valves to allow irrigation of each area separately.
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 SOCIETY OF SANITARY ENGINEERING (ASSE)ASSE 1012(2002) Backflow Preventer with Intermediate Atmospheric VentASSE 1013(2005) Reduced Pressure Principle Backflow Preventers and Reduced Pressure Fire Protection Principle Backflow PreventersASSE 1020(2004; Errata 2004; Errata 2004) Pressure Vacuum Breaker Assembly][AMERICAN WATER WORKS ASSOCIATION (AWWA)AWWA C509(2001) Resilient-Seated Gate Valves for Water Supply ServiceAWWA C606(2006) Grooved and Shouldered JointsAWWA C901(2008) Polyethylene (PE) Pressure Pipe and Tubing, 1/2 In. (13mm) Through 3 In. (76 mm), for Water Service][ASME INTERNATIONAL (ASME)ASME B1.2(1983; Errata 1992; R 2007) Gages and Gaging for Unified Inch Screw ThreadsASME B16.15(2006) Cast Bronze Threaded Fittings Classes 125 and 250ASME B16.18(2001; R 2005) Cast Copper Alloy Solder Joint Pressure FittingsASME B16.22(2001; R 2005) Standard for Wrought Copper and Copper Alloy Solder Joint Pressure FittingsASME B16.3(2006) Malleable Iron Threaded Fittings, Classes 150 and 300ASME B40.100(2005) Pressure Gauges and Gauge Attachments][ASTM INTERNATIONAL (ASTM)ASTM A 183(2003) Standard Specification for Carbon Steel Track Bolts and NutsASTM A 53/A 53M(2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessASTM A 536(1984e1; R 2004) Standard Specification for Ductile Iron CastingsASTM B 32(2008) Standard Specification for Solder MetalASTM B 43(1998; R 2004) Standard Specification for Seamless Red Brass Pipe, Standard SizesASTM B 88(2003) Standard Specification for Seamless Copper Water TubeASTM B 88M(2005) Standard Specification for Seamless Copper Water Tube (Metric)ASTM D 1785(2006) Standard Specification for Poly(Vinyl Chloride) (PVC), Plastic Pipe, Schedules 40, 80, and 120ASTM D 2000(2008) Standard Classification System for Rubber Products in Automotive ApplicationsASTM D 2241(2005) Standard Specification for Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)ASTM D 2287(1996; R 2001) Nonrigid Vinyl Chloride Polymer and Copolymer Molding and Extrusion CompoundsASTM D 2464(2006) Standard Specification for Threaded Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80ASTM D 2466(2006) Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40ASTM D 2564(2004e1) Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping SystemsASTM D 2774(2008) Underground Installation of Thermoplastic Pressure PipingASTM D 2855(1996; R 2002) Standard Practice for Making Solvent-Cemented Joints with Poly(Vinyl Chloride) (PVC) Pipe and FittingsASTM D 3261(2003) Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and TubingASTM F 441/F 441M(2002) Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80][FOUNDATION FOR CROSS-CONNECTION CONTROL AND HYDRAULIC RESEARCH (FCCCHR)FCCCHR Manual(1988e9) Manual of Cross-Connection Control][MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS INDUSTRY (MSS)MSS SP-80(2008) Bronze Gate, Globe, Angle and Check ValvesMSS SP-85(2002) Standard for Cast Iron Globe & Angle Valves, Flanged and Threaded Ends][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA ICS 2(2000; Errata 2002; R 2005; Errata 2006) Standard for Industrial Control and Systems: Controllers, Contractors, and Overload Relays Rated Not More than 2000 Volts AC or 750 Volts DC: Part 8 - Disconnect Devices for Use in Industrial Control EquipmentNEMA ICS 6(1993; R 2006) Standard for Industrial Controls and Systems Enclosures][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition][PLUMBING AND DRAINAGE INSTITUTE (PDI)PDI WH 201(2006) Water Hammer Arresters Standard][U.S. GENERAL SERVICES ADMINISTRATION (GSA)FS A-A-51145(Rev D) Flux, Soldering, Non-Electronic, Paste and Liquid]1.2 SYSTEM DESCRIPTION
NOTE: In the design of the sprinkler system reference will be made to UFC 3-230-10A.
For a site where specific pipe or material is required or where certain material
will not be acceptable, the requirements will be specified and any restricting
locations will be shown on the drawings. The following information will be
shown on the drawings:
a. An irrigation legend.
b. The extent, size, type, and location of underground sprinkler irrigation
system and all appurtenances including all piping, sprinkler heads, emitters,
control valves, and controllers. Indicate obstacles that might interfere with
the layout or operation of the system. Indicate where pipe under walks and
drives must be bored.
c. All required slopes and elevations.
d. Detail of drain pockets.
e. Flow rates and diameter of coverage for individual sprinkler heads and emitters.
f. Minimum irrigation rates.
g. Size, variety, and assembly of backflow prevention units.
h. Number and extent of electrical or hydraulic controller circuits, if required.
i. Automatic valve schedule and timing, along with valve identification key
or legend.
Provide a system that operates with a minimum water pressure of [_____] kPa psi at connection to [main] [meter]
[building] [backflow prevention device] and [_____] kPa psi at the last head in each zone. Submit Design Analysis
and Calculations as specified in the Submittals paragraph.
1.3 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.] Submit the following in
accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Sprinkler System
Detail drawings for valves, sprinkler heads, backflow preventers, automatic controllers, emitter
heads, and water hammer arresters. Include on the drawings a complete list of equipment and
materials, and manufacturer's descriptive and technical literature, performance charts and curves,
catalog cuts, and installation instructions. Also show on the drawings complete wiring and
schematic diagrams and any other details required to demonstrate that the system has been coordinated
and will function as a unit. Show on the drawings proposed system layout, type and number of
heads and emitters, zone valves, drain pockets, backflow devices, controllers, and mounting
details of controllers. Include As-built Drawings which provide current factual information
showing locations of mains, heads, valves, and controllers including deviations from and amendments
to the drawings and changes in the work.
SD-03 Product Data
Framed Instructions
Labels, signs, and templates of operating instructions that are required to be mounted or
installed on or near the product for normal, safe operation.
Field Training
Information describing training to be provided, training aids to be used, samples of training
materials to be provided, and schedules and notification of training.
Sprinkler System
Detailed procedures defining the Contractor's provisions for accident prevention, health protection,
and other safety precautions for the work to be done.
Spare Parts
Spare parts data for each different item of material and equipment specified.
Design Analysis and Calculations
Design analyses and pressure calculations verifying that system will provide the irrigation
requirements.
SD-06 Test Reports
Field Tests
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. Indicate in each test report
the final position of control valves.
SD-07 Certificates
Sprinkler System
The material supplier's or equipment manufacturer's statement that the supplied material or
equipment meets specified requirements. Each certificate shall be signed by an official authorized
to certify in behalf of material supplier or product manufacturer and shall identify quantity
and date or dates of shipment or delivery to which the certificates apply.
SD-10 Operation and Maintenance Data
Sprinkler System
[Six] [_____] copies of operation and [six] [_____] copies of maintenance manuals for the
equipment furnished. One complete set prior to field testing and the remainder upon acceptance.
Manuals shall be approved prior to the field training course. Operating manuals shall detail
the step-by-step procedures required for system startup, operation, and shutdown. Operating
manuals shall include the manufacturer's name, model number, parts list, and brief description
of all equipment and their basic operating features. Maintenance manuals shall list routine
maintenance procedures, possible breakdowns and repairs, and troubleshooting guides. Maintenance
manuals shall include piping and equipment layout, simplified wiring and control diagrams of
the system as installed, and system programming schedule.
1.4 DELIVERY, STORAGE, AND HANDLING
Protect all equipment delivered and placed in storage from the weather, excessive humidity, and temperature variation;
direct sunlight (in the case of plastic or rubber materials); and dirt, dust, or other contaminants.
1.5 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 the start of the field tests. Include with 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
2.1.1 Standard Products
Provide materials and equipment which are the standard products of a manufacturer who has produced similar systems
that have performed well for a minimum period of 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.
2.1.2 Nameplates
Each item of equipment shall have the manufacturer's name, address, type or style, model or serial number, and
catalog number on a plate secured to the item of equipment.
2.1.3 Additional Stock
Provide the following extra stock: Two sprinkler heads of each size and type, two valve keys for operating manual
valves, two wrenches for removing and installing each type of head, two quick coupler keys and hose swivels,
and four irrigation controller housing keys.
2.2 PIPING MATERIALS
NOTE: Select piping materials according to project requirements. Verify soil
and water conditions onsite, use proper materials where corrosion problems exist.
2.2.1 Copper Tubing and Associated Fittings
Tubing shall conform to requirements of ASTM B 88M ASTM B 88, Type K. Fittings shall conform to ASME B16.22
and ASME B16.18, solder joint. Solder shall conform to ASTM B 32 95-5 tin-antimony. Flux shall conform to FS A-A-51145
, Type I. Grooved mechanical joints and fittings shall be designed for not less than 862 kPa 125 psig service
and shall be the product of the same manufacturer. Grooved fitting and mechanical coupling housing shall be
ductile iron conforming to ASTM A 536. Gaskets for use in grooved joints shall be molded synthetic polymer of
pressure responsive design and shall conform to ASTM D 2000 for circulating medium up to 110 degrees C 230 degrees
F. Grooved joints shall conform to AWWA C606. Coupling nuts and bolts for use in grooved joints shall be steel
and shall conform to ASTM A 183.
2.2.2 Red Brass Pipe and Associated Fittings
Pipe shall conform to requirements of ASTM B 43, regular. Fittings shall be Class 250, cast bronze threaded
conforming to the requirements of ASME B16.15.
2.2.3 Galvanized Steel Pipe and Associated Fittings
NOTE: Use of pipe is limited to fixed shrub head risers and reduced pressure
type backflow preventers.
Pipe shall conform to requirements of ASTM A 53/A 53M, Schedule 40. Fittings shall be Class 150 conforming to
requirements of ASME B16.3.
2.2.4 Polyvinyl Chloride (PVC) Pipe, Fittings and Solvent Cement
NOTE: PVC pipe may be used where frost line is less than 300 mm (12 inches)
deep or in areas where piping system can be winterized. Use Schedule 40 PVC
fittings with solvent weld; do not use threaded Schedule 40 pipe. For risers
use brass pipe or Schedule 80 PVC pipe with Schedule 80 PVC threaded fittings.
Locate all risers away from walks. Use solvent cement for unthreaded PVC pipe
and fittings. ASTM D 1785, PVC 1120, Schedule 40 is Type I, Grade 1 and wall
thickness of Schedule 40. ASTM D 1785, PVC 1120, Schedule 80 is Type I, Grade
2 and wall thickness of Schedule 80. ASTM D 2241, PVC 1120, SDR 21 is Type
I, Grade 1 and standard dimension ratio of 21.
2.2.4.1 PVC Pipe
Pipe shall conform to the requirements of ASTM D 1785, PVC 1120 Schedule [40] [80]; or ASTM D 2241, PVC 1120
SDR 21, Class 200.
2.2.4.2 PVC Fittings
Solvent welded socket type fittings shall conform to requirements of ASTM D 2466, Schedule 40. Threaded type
fittings shall conform to requirements of ASTM D 2464, Schedule 80.
2.2.4.3 Solvent Cement
Solvent cement shall conform to the requirements of ASTM D 2564.
2.2.5 Polyethylene (PE) Plastic Piping
Pipe shall conform to AWWA C901, outside diameter base with dimension ratio (DR) of 9.3 to provide 1034 kPa 150
psi minimum pressure rating. Fittings shall conform to ASTM D 3261, DR of 9.3.
2.2.6 Dielectric Fittings
NOTE: Provide dielectric fittings between copper and ferrous metal piping materials.
Dielectric fittings shall conform to ASTM F 441/F 441M, Schedule 80, CPVC threaded pipe nipples, 100 mm 4 inch
minimum length.
2.2.7 Emitter Hose and Distribution Tubing
Emitter hose and distribution tubing shall conform to ASTM D 2287, maximum inside diameter of 13 mm 1/2 inch,
minimum wall thickness of 2.286 mm 90 mils, vinyl plastic extruded from non-rigid chloride, integrally algae-resistant,
homogeneous throughout, smooth inside and outside, free from foreign materials, cracks, serrations, blisters
and other effects. Slip fittings shall be provided.
2.3 SPRINKLER AND EMITTER HEADS
2.3.1 Pop-Up Spray Heads
2.3.1.1 General Requirements
Pop-up spray heads lay flush with housing, then pop up when water pressure 138 kPa 20 psi is activated in system.
The rising member supporting the nozzle shall be identical on full, half, third or quarter pattern sprinklers
so that nozzles will be interchangeable. The sprinkler head shall be designed to be adjustable for coverage
and flow. The nozzle shall be removable so head does not have to be removed for flushing or cleaning. Nozzle
rises a minimum of 100 mm 4 inches above the body. The body shall be constructed with a 13 mm 1/2 inch female
thread for installation in a fixed underground pipe system.
2.3.1.2 Shrubbery Sprinkler Heads
NOTE: Shrubbery sprinkler heads are recommended for flower beds, shrubs, and
ground covers.
Sprinkler heads shall be conical spray with adjustable or non-adjustable coverage and designed for permanent
aboveground mounting on riser or pop-ups at a height compatible with ground covers. Provide brass nozzles.
2.3.2 Rotary Pop-Up Sprinklers
NOTE: Rotary pop-up sprinklers lay flush with housing, then pop up when water
pressure is activated in system. Head rotates to direct water spray over a
pattern of 360 degrees or a prescribed arc. Primarily used for watering large
turf area.
Sprinklers shall be capable of covering [_____] m feet diameter at [_____] kPa psi with a distribution rate of
[_____] L/second gpm, [_____] pop-up, trajectory of [_____], and maximum height of spray of [_____]. Construction
shall be high impact molded plastic with filter screen, reducible watering radius, and choice of [_____] nozzles
and have adjustable radius capabilities.
2.3.3 Bubbler Sprinkler Heads
NOTE: A water outlet that does not spray water but permits water to bubble
and flow to surrounding plants.
Heads shall be multiple-spray bubbler with adjustable flow and designed for permanent aboveground mounting on
risers.
2.3.4 Surface Connected Lawn Sprinkler Heads
Heads shall be an impulse type with or without sled, ring, or wheel base; multiple T Type; a rotary type with
sled, spike or wheel base; or oscillating type with wheel or sled base.
2.3.5 Emitter Heads
NOTE: Emitter head is an outlet device that permits water to drip or trickle
from small tubings. Drip irrigation is frequent, slow application of water
to specific root zone area of plants. The goal is to provide a constant level
of subsurface moisture to the root ball of plant for most favorable growth.
Emitter heads shall be self-cleaning, pressure compensating diaphragm with one or six self-piercing barbed outlets;
each capable of emitting from 1 to 8 L/hour 1/4 to 2 gallons/hour flow. Emitter body shall be ultraviolet stabilized,
algae, and heat resistant plastic construction.
2.4 VALVES
2.4.1 Gate Valves, Less than 80 mm 3 Inches
Gate valves shall conform to the requirements of MSS SP-80, Type 1, Class 150, [threaded] [soldered] ends.
2.4.2 Gate Valves, 80 mm 3 Inches and Larger
Gate valves shall conform to the requirements of AWWA C509 and have encapsulated resilient wedge, parallel seats,
non-rising stems, and open by counterclockwise turning. End connections shall be flanged. Interior construction
of valves shall be bronze including stem containing a maximum 2 percent aluminum and maximum 16 percent zinc.
2.4.3 Angle Valves, Less Than 65 mm 2-1/2 Inches
Angle valves shall conform to the requirements of MSS SP-80, Type 3, Class 150 [threaded] [soldered] ends.
2.4.4 Angle Valves, 65 mm 2-1/2 Inches and Larger
Angle valves shall conform to the requirements of MSS SP-85, Type II, Class 250 [threaded] [flanged] ends.
2.4.5 Quick Coupling Valves
NOTE: A quick coupling device is an effective method of keeping sprinkler out
of the way when not in use, eliminating the possibility of damage, injury or
theft.
Quick coupling valves shall have brass parts and shall be two-piece unit consisting of a coupler water seal valve
assembly and a removable upper body to allow spring and key track to be serviced without shutdown of main. Lids
shall be lockable vinyl with spring for positive closure on key removal.
2.4.6 Remote Control Valves, Electrical
NOTE: An activated open and shut-off device for controlling water flow to sprinkler
branch line.
Remote control valves shall be solenoid actuated globe valves of 19 to 80 mm 3/4 to 3 inch size, suitable for
[24] [_____] volts, [60] [50] cycle, and designed to provide for shut-off in event of power failure. Valve shall
be cast bronze or brass or plastic housing suitable for service at 1034 kPa 150 psi operating pressure with external
flow control adjustment for shut-off capability, external plug at diaphragm chamber to enable manual operation,
filter in control chamber to prevent valve body clogging with debris, durable diaphragm, and accessibility to
internal parts without removing valve from system.
2.4.7 Drain Valves
2.4.7.1 Manual Valves
Manual valves shall conform to requirements of MSS SP-80, Type 3, Class 150 [threaded] [soldered] ends for sizes
less than 65 mm 2-1/2 inches and MSS SP-85, Type II, Class 250 [threaded] [flanged] ends for sizes 65 mm 2-1/2
inches and larger.
2.4.7.2 Automatic Valves
NOTE: This saves water to prevent draining 50 to 100 mm (2 to 4 inch) diameter
lines during irrigation cycles and avoid continuously saturated soil at drain
joints. Automatic drains are necessary for cold climate areas to prevent freeze
damage to sprinklers and pipes. PVC or ABS drain valves may be used with PVC
systems.
Delete automatic drains for warm climate areas.
Automatic valves shall be brass or plastic, spring loaded ball drip type, Class 150 150 pounds and threaded ends,
designed to close at 18 kPa 6 foot pressure head with positive seal at 21 kPa 3 psi pressure or greater and be
open to drain at less than 21 kPa 3 psi pressure.
2.4.8 Pressure Regulating Master Valve
NOTE: Master valve automatically reduces a higher inlet pressure to a constant
lower pressure regardless of supply fluctuations.
Pressure regulating master valve shall be automatic mechanical self-cleaning, self-purging control system having
an adjustable pressure setting operated by a solenoid on alternating current with [0.70] [_____] amperes at [18]
[24] volts. Valve shall close slowly and be free of chatter in each diaphragm position, have manual flow stem
to adjust closing speed and internal flushing, and [one] [two] inlet tappings capable of being installed as a
straight pattern valve. Body shall be cast bronze or brass with removable brass seat serviceable from top without
removing valve body from system. Valve shall operate at 1034 kPa 150 psi working pressure and pilot range from
70 to 875 kPa 10 to 125 psi.
2.4.9 Backflow Preventers
NOTE: Backflow preventer is designed to keep contaminated water from flowing
back into potable water distribution system when some temporary abnormality
in system causes higher pressure in contaminated part of system than in potable
water piping.
Reduced pressure principle assemblies, double check valve assemblies, atmospheric (nonpressure) type vacuum breakers,
and pressure type vacuum breakers shall be tested, approved, and listed in accordance with FCCCHR Manual. Backflow
preventers with intermediate atmospheric vent shall be in accordance with ASSE 1012. Reduced pressure principle
backflow preventers shall be in accordance with ASSE 1013.
2.4.9.1 Pressure Type Vacuum Breaker
NOTE: Vacuum breaker is designed to prevent back siphonage only, and is not
effective against backflow due to back pressure. A vacuum breaker located above
flood elevation is adequate when located aboveground and higher than highest
sprinkler head.
Vacuum breaker shall conform to the requirements of ASSE 1020 and shall be [bronze] [brass] construction, with
one or two check valves, vacuum relief, inlet and discharge shut-offs valves, field test cocks, and vacuum relief
opening of greater diameter than unit.
2.4.9.2 Reduced Pressure Type Backflow Preventers
NOTE: Reduced pressure type backflow preventer is designed to prevent either
back siphonage or back pressure from causing a reverse flow and subsequent contamination
of potable water piping. Delete this requirement when system is connected to
non-potable water supply system, or when sewage is injected into sprinkler system.
When effluent pumps are down, add a fresh water connection with a reduced pressure
backflow preventer.
Backflow preventers shall be Class [150] [_____] [150] [_____] pound flanged [cast iron], [bronze] [brass] mounted
gate valve [and strainer], [304] [_____] stainless steel or bronze, internal parts. Total pressure drop through
complete assembly shall be a maximum of 70 kPa 10 psi at rated flow. Piping shall be [red brass] [galvanized
steel] pipe and fittings. Strainers shall be bronze or brass construction with gasket caps. Units shall have
200-mesh stainless steel screen elements.
2.5 ACCESSORIES AND APPURTENANCES
2.5.1 Valve Keys for Manually Operated Valves
Valve keys shall be 13 mm 1/2 inch diameter by 1 m 3 feet long, tee handles and keyed to fit valves.
2.5.2 Valve Boxes and Concrete Pads
2.5.2.1 Valve Vaults
Valve boxes shall be cast iron, plastic lockable, or precast concrete[ manufactured in accordance with Section
03 40 00.00 10 PLANT-PRECAST CONCRETE PRODUCTS FOR BELOW GRADE CONSTRUCTION] for each gate valve, manual control
valve and remote control valve. Vault sizes shall be adjustable for valve used. Cast the word "IRRIGATION"
on the cover. Shaft diameter of vault shall be minimum 130 mm5-1/4 inches. Cast iron vault shall have bituminous
coating.
2.5.2.2 Concrete Pads
Concrete pads shall be precast[ manufactured in accordance with Section 03 40 00.00 10 PLANT-PRECAST CONCRETE
PRODUCTS FOR BELOW GRADE CONSTRUCTION] or cast-in-place reinforced concrete construction for reduced pressure
type backflow preventers.
2.5.3 Pressure Gauges
Pressure gauges shall conform to requirements of ASME B40.100, single style pressure gauge for water with 115
mm 4-1/2 inch dial brass or aluminum case, bronze tube, gauge cock, pressure snubber, and siphon. Scale range
shall be suitable for irrigation sprinkler systems.
2.5.4 Service Clamps
Service clamps shall be bronze flat, double strap, with neoprene gasket or "O"-ring seal.
2.5.5 Water Hammer Arresters
Water hammer arrester shall conform to the requirements of PDI WH 201; stainless steel construction with an encased
and sealed bellows compression chamber.
2.5.6 Emitter Head Accessories
2.5.6.1 Strainer
Strainer shall be provided at inlet to each drip line. Strainer shall have stainless steel screen having equivalent
of 140-mesh filtration capacity and incorporate flush valves within strainer to clean screen without disassembling
unit.
2.5.6.2 Pressure Regulator
Pressure regulator shall be provided at each drip system if supply pressure exceeds 350 kPa 50 psi.
2.5.6.3 Riser Adapters
Riser adapters shall be provided with a rigid piping system.
2.5.6.4 Tubing Stakes
Tubing stakes shall be plastic coated steel, or other non-corrosive strong material to secure tubing.
2.5.6.5 Emitter Outlet Check Valve (Bug Cap)
Check valves shall be provided at end of each emitter outlet distribution line. Valves shall permit free flow
of water with minimum restriction; prevent back siphoning, entry of insects, and contamination into outlet ports.
2.5.6.6 Access Sleeve
Access sleeve shall be provided at buried emitters placed in covered boxes. Lids of access sleeve shall be secured
with removable lugs. Drip hose in both vertical and horizontal axis shall be secured.
2.5.6.7 Closure Caps
Closure caps shall be in accordance with manufacturer's recommendations.
2.6 AUTOMATIC CONTROLLERS, ELECTRICAL
NOTE: Automatic electrical controller is used to control timing and quantity
of water to sprinkler or emitter heads. Use 3 to 60 minutes for sprinkler heads
and 0 to 3 hours for emitter heads.
Controller shall conform to the requirements of NEMA ICS 2 with [120] [220]-volt single phase service, operating
with indicated stations, and grounded chassis. Enclosure shall conform to NEMA ICS 6 Type 3R, with locking hinged
cover, [pedestal-mounted] [wall-mounted]. Controller shall be programmed for various schedules by setting switches
and dials equipped with the following features: A switch for each day of week for [one] [two] [three] schedules,
allowing each station to be scheduled individually as to days of watering; a minute switch for each station with
a positive increment range of [3 to 60 minutes] [0 to 3 hours], set time within one percent; a switch allowing
selected schedules to be repeated after each completion of initial watering schedule and allowing each operation
to be scheduled throughout a 24-hour day; a circuit breaker for surge protection; and circuit for a 9-volt rechargeable
NiCad battery.
2.7 ELECTRICAL WORK
Wiring and rigid conduit for electrical power shall be in accordance with NFPA 70, and Section
33 70 02.00 10 ELECTRICAL DISTRIBUTION SYSTEM, UNDERGROUND.
2.8 CONCRETE MATERIALS
Concrete shall have a compressive strength of [17] [_____] MPa [2500] [_____] psi at 28 days as specified in
Section 03 31 00.00 10 CAST-IN-PLACE STRUCTURAL CONCRETE.
2.9 WATER SUPPLY MAIN MATERIALS
Tapping sleeves, service cut off valves, and connections to water supply mains shall be in accordance with Section
33 11 00 WATER DISTRIBUTION.
2.10 INSULATING JOINTS
Insulating joints and dielectric fittings shall be in accordance with Section 33 11 00 WATER DISTRIBUTION.
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 INSTALLATION
Install Sprinkler System after site grading has been completed. Perform excavation, trenching, and backfilling
for sprinkler system in accordance with the applicable provisions of Section 31 00 00 EARTHWORK, except as modified
herein.
3.2.1 Trenching
Hand excavate trench around roots to pipe grade when roots of 50 mm 2 inches diameter or greater are encountered.
Trench width shall be 100 mm 4 inches minimum or 1.5 times diameter of pipe, whichever is wider. Backfill shall
be hand tamped over excavation. When rock is encountered, trench shall be excavated 100 mm 4 inchesdeeper and
backfilled with silty sand (SM) or well-graded sand (SW) to pipe grade. Trenches shall be kept free of obstructions
and debris that would damage pipe. Subsoil shall not be mixed with topsoil. Existing concrete walks, drives
and other obstacles shall be bored at a depth conforming to bottom of adjacent trenches. Pipe sleeves for bored
pipe shall be two pipe diameters larger than sprinkler pipe.
3.2.2 Piping System
3.2.2.1 Cover
Underground piping shall be installed to meet the minimum depth of backfill cover specified.
3.2.2.2 Clearances
Minimum horizontal clearances between lines shall be 100 mm 4 inches for pipe 50 mm 2 inches and less; 300 mm
12 inches for 65 mm 2-1/2 inches and larger. Minimum vertical clearances between lines shall be 25 mm 1 inch
.
3.2.2.3 Minimum Slope
Minimum slope shall be 50 mm per 10 m 6 inches per 100 feet in direction of drain valves.
3.2.3 Piping Installation
3.2.3.1 Polyvinyl Chloride (PVC) Pipe
a. Solvent-cemented joints shall conform to the requirements of ASTM D 2855.
b. Threaded joints shall be full cut with a maximum of three threads remaining exposed on pipe and nipples.
Threaded joints shall be made tight without recourse to wicks or fillers, other than polytetrafluoroethylene
thread tape.
c. Piping shall be joined to conform with requirements of ASTM D 2774 or ASTM D 2855, and pipe manufacturer's
instructions. Pipe shall be installed in a serpentine (snaked) manner to allow for expansion and contraction
in trench before backfilling. Pipes shall be installed at temperatures over 5 degrees C 40 degrees F
.
3.2.3.2 Soldered Copper Tubing
Pipe shall be reamed and burrs removed. Contact surfaces of joint shall be cleaned and polished. Flux shall
be applied to male and female ends. End of tube shall be inserted into fittings full depth of socket. After
soldering, a solder bead shall show continuously around entire joint circumference. Excess acid flux shall be
removed from tubings and fittings.
3.2.3.3 Threaded Brass or Galvanized Steel Pipe
Prior to installation, pipe shall be reamed. Threads shall be cut in conformance with ASME B1.2. Pipe joint
compound shall be applied to male end only.
3.2.3.4 Insulating Joints
Insulating and dielectric fittings shall be provided where pipes of dissimilar metal are joined and at connections
to water supply mains as shown. Installation shall be in accordance with Section 33 11 00 WATER DISTRIBUTION.
3.2.3.5 Grooved Mechanical Joints
Grooves shall be prepared according to the coupling manufacturer's instructions. Grooved fittings, couplings,
and grooving tools shall be products of the same manufacturer. Pipe and groove dimentions shall comply with
the tolerances specified by the coupling manufacturer. The diameter of grooves made in the field shall be measured
using a "go/no-go" gauge, vernier or dial caliper, narrow-land micrometer, or other method specifically approved
by the coupling manufacturer for the intended application. Grove width and dimension of groove from end of pipe
shall be measured and recorded for each change in grooving tool setup to verify compliance with the coupling
manufacturer's tolerances. Grooved joints shall not be used in concealed locations.
3.2.4 Installation of Valves
3.2.4.1 Manual Valves
Valves shall be installed in a valve box extending from grade to below valve body, with a minimum of 100 mm 4
inches cover measured from finish grade to top of valve stem.
3.2.4.2 Automatic Valves
Valve shall be set plumb in a valve box extending from grade to below valve body, with minimum of 100 mm 4 inch
cover measured from grade to top of valve. Automatic valves shall be installed beside sprinkler heads with
a valve box.
3.2.4.3 Drain Valves
Entire system shall be manually or automatically drainable. Low points of system shall be equipped with drain
valve draining into an excavation containing 0.03 cubic meter 1 cubic foot gravel. Gravel shall be covered with
building paper then backfilled with excavated material and 150 mm 6 inches of topsoil.
3.2.5 Sprinklers and Quick Coupling Valves
Sprinklers and valves shall be installed plumb and level with terrain.
3.2.6 Installation of Drip Irrigation System
3.2.6.1 Emitter Hose
Emitter laterals shall be buried [150] [_____] mm [6] [_____] inches deep. Connections shall be solvent welded
in accordance with manufacturer's recommendation to standard weight Schedule 40 PVC fittings and bushings. Hose
shall be installed in a serpentine manner. When cutting hose, shearing tool such as a pipe cutter, knife, or
shears shall be used. Manufacturer's recommended tool and procedures when punching hose for emitters shall be
followed.
3.2.6.2 Emitter Heads
NOTE: Installation of water emission points of drip irrigation system above
soil surface aids visual checking of system for proper operation and reduces
system clogging caused by root intrusion.
Emitters shall be installed in a plastic emitter box. Emitter on a rigid PVC nipple shall be connected to PVC
drip lateral with a tee or elbow. Tubing shall be attached to barbed fitting and daylight distribution tubing
at root ball secured with stake, with bug cap at end of secured distribution tubing. After installing emitters
and before operating system, end of drip lateral shall be opened and flushed clean. The number of emitters on
a line shall not exceed manufacturer's recommendations for that hose or distribution tubing size and length.
3.2.6.3 Tubing Stakes
Main irrigation line shall be secured with stakes where line is aboveground. Stakes shall be spaced to ensure
that hose does not shift location in presence of foot traffic, operations, gravity on slope installations, or
environmental effects. Discharge of the emitter distribution tubing shall be staked to ensure that discharge
point of emitter will be maintained at specified position in relation to plant material to be irrigated.
3.2.7 Backflow Preventers
Backflow preventer shall be installed in new connection to existing water distribution system, between connection
and control valves. Backflow preventer shall be installed with concrete pads.
3.2.7.1 Pressure Type Vacuum Breaker
NOTE: Install device in an accessible location to facilitate inspection and
servicing. Device can be installed on main line to irrigation system upstream
of shut-off valves (valves may be located downstream from device).
Pressure type vacuum breaker shall be installed 300 mm 12 inches above highest head.
3.2.7.2 Reduced Pressure Type
NOTE: Install device in an accessible location to facilitate inspection and
servicing. To prevent freezing locate device inside a building and pipe the
relief valve port through an air gap to a drain. Install the device 300 mm (12
inches), minimum, above grade.
Pipe lines shall be flushed prior to installing reduced pressure device; device shall be protected by a strainer
located upstream. Device shall not be installed in pits or where any part of device could become submerged in
standing water.
3.2.8 Control Wire and Conduit
3.2.8.1 Wires
Low voltage wires may be buried beside pipe in same trench. Rigid conduit shall be provided where wires run
under paving. Wires shall be number tagged at key locations along main to facilitate service. One control circuit
shall be provided for each zone and a circuit to control sprinkler system.
3.2.8.2 Loops
A 300 mm 12 inch loop of wire shall be provided at each valve where controls are connected.
3.2.8.3 Expansion and Contraction
Multiple tubes or wires shall be bundled and taped together at [3] [6] m [10] [20] foot intervals with 300 mm
12 inch loop for expansion and contraction.
3.2.8.4 Splices
Electrical splices shall be waterproof.
3.2.9 Automatic Controller
Exact field location of controllers shall be determined before installation. Coordinate the electrical service
to these locations. Install in accordance with manufacturer's recommendations and NFPA 70.
3.2.10 Thrust Blocks
NOTE: Install thrust blocks at bends, tee plugs, and valves of 80 mm (3 inch)
minimum pipe size.
Concrete shall be placed so that sides subject to thrust or load are against undisturbed earth, and valves and
fittings are serviceable after concrete has set. Thrust blocks shall be as specified in Section 33 11 00 WATER
DISTRIBUTION.
3.2.11 Backfill
3.2.11.1 Minimum Cover
NOTE: Depths of cover are 300 mm (12 inches) for laterals and 450 mm (18 inches)
for mains in warm climate areas. Use 600 mm (24 inches) for mains and laterals
where piping can be drained in cold climate areas to protect pipe from frost.
Consult local conditions in cold climates to protect against freezing of supply
mains.
Depth of cover shall be [300] [600] [_____] mm [12] [24] [_____] inches for 32 mm 1-1/4 inch pipe or smaller;
[300] [450] [600] [_____] mm [12] [18] [24] [_____] inches for 40 to 50 mm 1-1/2 to 2 inch pipe; [450] [600]
[_____] mm [18] [24] [_____] inches for 65 mm 2-1/2 inch pipe or larger; [1000] [_____] mm [36] [_____] inches
for pipes under traffic loads, farm operations, and freezing temperatures; and [300] [450] mm [12] [18] inches
for low-voltage wires. Remainder of trench or pipe cover shall be filled to within 80 mm 3 inches of top with
excavated soil, and compact soil with plate hand-held compactors to same density as undisturbed adjacent soil.
3.2.11.2 Restoration
NOTE: Insert the section number and title for the restoration of pavements.
Top 80 mm 3 inches shall be filled with topsoil and compacted with same density as surrounding soil. Lawns and
plants shall be restored in accordance with Sections 32 92 19 SEEDING, 32 92 23 SODDING, 32 92 26 SPRIGGING,
and Section 32 93 00 EXTERIOR PLANTS. Pavements shall be restored in accordance with Section [_____].
3.2.12 Adjustment
After grading, seeding, and rolling of planted areas, sprinkler heads shall be adjusted flush with finished grade.
Adjustments shall be made by providing new nipples of proper length or by use of heads having an approved device,
integral with head, which will permit adjustment in height of head without changing piping.
3.2.13 Disinfection
Sprinkler system fed from a potable water system shall be disinfected upstream of backflow preventer in accordance
with Section 33 11 00 WATER DISTRIBUTION.
3.2.14 Cleaning of Piping
Prior to the hydrostatic and operation tests, the interior of the pipe shall be flushed with clean water until
pipe is free of all foreign materials. Flushing and cleaning out of system pipe, valves, and components shall
not be considered completed until witnessed and accepted by Contracting Officer.
3.3 FRAMED INSTRUCTIONS
Post framed instructions, containing wiring and control diagrams under glass or in laminated plastic, where directed.
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. After as-built drawings
are approved by Contracting Officer, prepare controller charts and programming schedule. One chart for each
controller shall be supplied. Chart shall be a reduced drawing of actual as-built system that will fit the maximum
dimensions inside controller housing. Black line print for chart and a different pastel or transparent color
shall indicate each station area of coverage. After chart is completed and approved for final acceptance, chart
shall be sealed between two 0.505 mm 20 mil pieces of clear plastic.
3.4 FIELD TRAINING
Provide a field training course for designated operating and maintenance staff members for a total period of
[_____] hours of normal working time and starting 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.
3.5 FIELD TESTS
NOTE: Delete leakage tests if water supply service main is not part of contract.
Provide all instruments, equipment, facilities, and labor required to conduct the tests.
3.5.1 Hydrostatic Pressure Test
Piping shall be tested hydrostatically before backfilling and proved tight at a hydrostatic pressure of 1034
kPa 150 psi without pumping for a period of one hour with an allowable pressure drop of 35 kPa 5 psi. If hydrostatic
pressure cannot be held for a minimum of 4 hours, make adjustments or replacements and repeat the tests until
satisfactory results are achieved and accepted by the Contracting Officer.
3.5.2 Leakage Tests
Leakage tests for service main shall be in accordance with Section 33 11 00 WATER DISTRIBUTION.
3.5.3 Operation Test
At conclusion of pressure test, sprinkler heads or emitter heads, quick coupling assemblies, and hose valves
shall be installed and entire system tested for operation under normal operating pressure. Operation test consists
of the system operating through at least one complete programmed cycle for all areas to be sprinkled.
3.6 CLEANUP
Upon completion of installation of system, all debris and surplus materials resulting from the work shall be
removed.