USACE / NAVFAC / AFCESA / NASA UFGS-33 11 23 (August 2008)
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Preparing Activity: NAVFAC Replacing without change
UFGS-33 23 00.00 20 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 33 11 23
NATURAL GAS AND LIQUID PETROLEUM PIPING
08/08
NOTE: This guide specification covers the requirements for exterior and interior
fuel gas piping.
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).
NOTE: This guide specification is intended for use when specifying buried polyethylene
piping of up to 200 mm 8 inches in nominal pipe size at pressures and other
conditions governed by ASME B31.8, "Gas Transmission and Distribution Piping
Systems," and aboveground steel piping both outside (up to 1.50 meters 5 feet
beyond exterior walls) and within buildings in compliance with NFPA 54, "Fuel
Gas Piping."
NOTE: The following information shall be shown on the project drawings:
1. Layout and location of piping.
2. Location of appurtenances, valves, etc.
3. Details of method of mounting piping.
4. Capacity of pressure regulators
5. Location and capacity of LP gas containers.
PART 1 GENERAL
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 GAS ASSOCIATION (AGA)AGA B109.1(2000)Diaphragm-Type Gas Displacement Meters (Under 500 cubic ft./hour Capacity)AGA B109.2(2000)Diaphragm-Type Gas Displacement Meters (500 cubic ft./hour Capacity and Over)AGA B109.3(2000)Rotary-Type Gas Displacement Meters][AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI Z21.45(1995) Flexible Connectors of Other Than All-Metal Construction for Gas Appliances][AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)ASCE 25(2008) Standard for Earthquake-Activated Automatic Gas Shutoff Devices][ASME INTERNATIONAL (ASME)ASME B1.1(2003; R 2008) Unified Inch Screw Threads (UN and UNR Thread Form)ASME B1.20.1(1983; R 2006) Pipe Threads, General Purpose (Inch)ASME B16.11(2005) Forged Fittings, Socket-Welding and ThreadedASME B16.3(2006) Malleable Iron Threaded Fittings, Classes 150 and 300ASME B16.33(2002; R 2007) Manually Operated Metallic Gas Valves for Use in Gas Piping Systems Up to 125 psi, Sizes NPS 1/2 - NPS 2ASME B16.38(2007) Large Metallic Valves for Gas Distribution (Manually Operated, NPS 2 1/2 to 12, 125 psig Maximum)ASME B16.39(1998; R 2006) Standard for Malleable Iron Threaded Pipe Unions; Classes 150, 250, and 300ASME B16.40(2002; Errata 2003) Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution SystemsASME B16.5(2003) Standard for Pipe Flanges and Flanged Fittings: NPS 1/2 Through NPS 24ASME B16.9(2007) Standard for Factory-Made Wrought Steel Buttwelding FittingsASME B18.2.1(1996; Addenda A 1999; Errata 2003; R 2005) Square and Hex Bolts and Screws (Inch Series)ASME B18.2.2(1987; R 2005) Standard for Square and Hex NutsASME B31.8(2007) Gas Transmission and Distribution Piping SystemsASME BPVC SEC VIII D1(2007; Addenda 2008) Boiler and Pressure Vessel Code; Section VIII, Pressure Vessels Division 1 - Basic Coverage][ASTM INTERNATIONAL (ASTM)ASTM A 193/A 193M(2008b) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature ServiceASTM A 194/A 194M(2008b) Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High-Pressure or High-Temperature Service, or BothASTM A 53/A 53M(2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessASTM D 2513(2008b) Thermoplastic Gas Pressure Pipe, Tubing, and FittingsASTM D 2683(2004) Standard Specification for Socket-Type Polyethylene Fittings for Outside Diameter-Controlled Polyethylene Pipe and Tubing][CSA AMERICA, INC. (CSA/AM)CSA/AM Z21.41(2003; A 2005; Errata 2007) Quick-Disconnect Devices for Use with Gas Fuel AppliancesCSA/AM Z21.69(2002; Addenda A 2003; Addenda B 2006; R 2007) Connectors for Movable Gas Appliances][MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS INDUSTRY (MSS)MSS SP-58(2002) Standard for Pipe Hangers and Supports - Materials, Design and ManufactureMSS SP-69(2003; R 2004) Standard for Pipe Hangers and Supports - Selection and ApplicationMSS SP-89(2003) Pipe Hangers and Supports - Fabrication and Installation Practices][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 54(2008) National Fuel Gas CodeNFPA 58(2007; Amendment 1 2007; Amendment 2 2007; Amendment 3 2007; Amendment 4 2008) Liquefied Petroleum Gas Code][SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION (SMACNA)SMACNA 1650(1998; Addendum 2000) Seismic Restraint Manual Guidelines for Mechanical Systems - Second Edition][U.S. DEPARTMENT OF DEFENSE (DOD)MIL-STD-101(Rev B) Color Code for Pipelines & for Compressed Gas Cylinders][U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)49 CFR 192Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards49 CFR 195Transportation of Hazardous Liquids by Pipeline]1.2 DEFINITION
a. Year 2000 compliant - means computer controlled facility components that accurately process
date and time data (including, but not limited to, calculating, comparing, and sequencing) from,
into, and between the twentieth and twenty-first centuries, and the years 1999 and 2000 and
leap year calculations.
1.3 RELATED REQUIREMENTS
Section 23 03 00.00 20 BASIC MECHANCIAL MATERIALS AND METHODS applies to this section, with additions and modifications
specified herein.
1.4 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.][for 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-03 Product Data
Valve box
Pressure regulator
Gas equipment connectors
Valves
Warning and identification tape
Risers
Transition fittings
Gas meter
[LPG containers and accessories]
SD-07 Certificates
Welder's qualifications
PE welder's qualifications
Welder's identification symbols
Year 2000 (Y2K) Compliance Warranty
Submit a copy of a certified ASME B31.8 qualification test report for each welder and welding
operator. Submit the assigned number, letter, or symbol that will be used in identifying the
work of each welder.
SD-08 Manufacturer's Instructions
PE pipe and fittings
Submit manufacturer's installation instructions and manufacturer's visual joint appearance
chart.
1.5 QUALITY ASSURANCE
1.5.1 Welder's Qualifications
Comply with ASME B31.8. The steel welder shall have a copy of a certified ASME B31.8 qualification test report.
The PE welder shall have a certificate from a PE pipe manufacturer's sponsored training course. Contractor shall
also conduct a qualification test. Submit each welder's identification symbols, assigned number, or letter,
used to identify work of the welder. Affix symbols immediately upon completion of welds. Welders making defective
welds after passing a qualification test shall be given a requalification test and, upon failing to pass this
test, shall not be permitted to work this contract.
1.5.2 PE Welder's Qualifications
Prior to installation, Contractor shall have supervising and installing personnel trained by a PE pipe manufacturer's
sponsored course of not less than one week duration, or present proof satisfactory to the Contracting Officer
that personnel are currently working in the installation of PE gas distribution lines.
1.5.3 Safety Standards
49 CFR 192 [and 49 CFR 195].
1.6 DELIVERY, STORAGE, AND HANDLING
Handle, transport, and store plastic pipe and fittings carefully. Plug or cap pipe ends during transportation
or storage to minimize dirt and moisture entry. Do not subject to abrasion or concentrated external loads. Discard
PE pipe sections and fittings that have been damaged.
1.7 WARRANTY
1.7.1 Year 2000 (Y2K) Compliance Warranty
For each product, component and system specified in this section as a "computer controlled facility component"
provide a statement of Y2K compliance warranty for the specific equipment. The contractor warrants that each
hardware, software, and firmware product delivered under this contract and listed below shall be able to accurately
process date and time data (including, but not limited to, calculating, comparing, and sequencing) from, into,
and between the twentieth and twenty-first centuries, and the years 1999 and 2000 and leap year calculations
to the extent that other computer controlled components, used in combination with the computer controlled component
being acquired, properly exchange data and time data with it. If the contract requires that specific listed
products must perform as a system in accordance with the foregoing warranty, then that warranty shall apply to
those listed products as a system. The duration of this warranty and the remedies available to the Government
for breach of this warranty shall be defined in, and subject to, the terms and limitations of the contractor's
standard commercial warranty or warranties contained in this contract, provided that, notwithstanding any provisions
to the contrary, in such commercial warranty or warranties, the remedies available to the Government under this
warranty shall include repair or replacement of any listed product whose non-compliance is discovered and made
known to the contractor in writing within one year (365 days) after acceptance. Nothing in this warranty shall
be construed to limit any rights or remedies the Government may otherwise have under this contract, with respect
to defects other that Year 2000 performance.
PART 2 PRODUCTS
2.1 Y2K COMPLIANT PRODUCTS
NOTE: To ensure that buildings' systems continue to function beyond Year 2000,
the following paragraph must be included when this section is part of a construction
contract. For more information on Y2K, see these web sites on the Internet.
http://www.doncio.navy.mil/y2k/year2000.htm, the Year 2000 homepage of the Department
of the Navy Chief Information Officer (DONCIO); http://www.itpolicy.gsa.gov/mks/yr2000.legal.htm,
the General Services Administration (GSA) Chief Information Officer (CIO) homepage
for Y2K procurement, contracting, and legal issues; http://y2k.lmi.org/gsa/y2kproducts
contains information on vendor product compliance.
Provide computer controlled facility components, specified in this section, that are Year 2000 compliant (Y2K).
Computer controlled facility components refers to software driven technology and embedded microchip technology.
This includes, but in not limited to, telecommunications switches, utility monitoring and control systems, fire
detection and suppression systems, alarms, security systems, and other facilities control systems utilizing microcomputer,
minicomputer, or programmable logic controllers.
2.2 MATERIALS AND EQUIPMENT
Conform to NFPA 54 and with requirements specified herein. Supply piping to appliances or equipment shall be
at least as large as the inlets thereof.
2.3 PIPE AND FITTINGS
2.3.1 Aboveground and Within Buildings and Vaults
NOTE: For steam electric generation stations, industrial and institutional
plants, and central heating plants, use Schedule 80 black steel piping in accordance
with ANSI B31.1 for threaded joints.
a. Pipe: Black steel in accordance with ASTM A 53/A 53M, Schedule [40] [80], threaded ends
for sizes 50 mm 2 inches and smaller; otherwise, plain end beveled for butt welding.
b. Threaded Fittings: ASME B16.3, black malleable iron.
c. Socket-Welding Fittings: ASME B16.11, forged steel.
d. Butt-Welding Fittings: ASME B16.9, with backing rings of compatible material.
e. Unions: ASME B16.39, black malleable iron.
f. Flanges and Flanged Fittings: ASME B16.5 steel flanges or convoluted steel flanges conforming
to ASME BPVC SEC VIII D1. Flange faces shall have integral grooves of rectangular cross sections
which afford containment for self-energizing gasket material.
2.3.2 Underground Polyethylene (PE)
PE pipe and fittings are as follows:
a. Pipe: ASTM D 2513, 690 kPa (gage) 100 psig working pressure, Standard Dimension Ratio (SDR),
the ratio of pipe diameter to wall thickness, 11.5 maximum.
b. Socket Fittings: ASTM D 2683.
c. Butt-Fusion Fittings: ASTM D 2513, molded.
2.3.3 Risers
Manufacturer's standard riser, transition from plastic to steel pipe with 0.18 to 0.30 mm 7 to 12 mil thick epoxy
coating. Use swaged gas-tight construction with O-ring seals, metal insert, and protective sleeve. Provide
[remote bolt-on or bracket] [or] [wall-mounted] riser supports [as indicated].
2.3.4 Transition Fittings
NOTE: Choose the applicable options from the following.
[a. Steel to Plastic (PE): As specified for "riser" except designed for steel-to-plastic with
tapping tee or sleeve. Coat or wrap exposed steel pipe with heavy plastic coating.]
[b. Plastic to Plastic: [Manufacturer's standard bolt-on (PVC to PE) plastic tapping saddle
tee, UL listed for gas service, rated for 690 kPa (gage) 100 psig, and O-ring seals.] [Manufacturer's
standard slip-on PE mechanical coupling, molded, with stainless-steel ring support, O-ring seals,
and rated for 1035 kPa (gage) 150 psig gas service.] [Manufacturer's standard fused tapping
(PE-to-PE) tee assembly with shut-off feature.]]
2.4 SHUTOFF VALVES, BELOW GROUND
[2.4.1 Metallic Ball Valves
NOTE: Choose this paragraph or the paragraph below entitled "PE Ball or Plug
Valves."
[ASME B16.33] [or] [ASME B16.38] corrosion-resisting steel, with threaded or flanged ends. Provide polytetrafluoroethylene
(PTFE) seats.
][2.4.2 PE Ball or Plug Valves
NOTE: PE ball or plug valves: Class 1 location means not more than 10 living
units, homes and separate living units within apartment buildings, along a 1600
meters one mile length of pipeline; Class 2 location means not more than 46
living units, along a 1600 meters one mile length of pipeline; Class 3 location
means not more than 20 persons normally congregating in any one building or
outdoor location; and Class 4 location means any location where Class 1 to 3
population densities are exceeded. The Class 4 class factor also applies where
there are buildings of more than three stories.
ASME B16.40 and ASTM D 2513, Class C materials (PE 2306 or PE 3406), strength rating of Class [1 location with
class factor of 0.32] [2 location with class factor of 0.25] [3 location with class factor of 0.25] [4 location
with class factor of 0.20], and SDR matching PE pipe dimensions and working pressure.
]2.5 VALVES, ABOVEGROUND
[Provide lockable valves where indicated.]
2.5.1 Shutoff Valves, Sizes Larger Than 50 Millimeters 2 Inches
NOTE: Choose one of the options below.
NOTE: Do not use cast-iron material for valve body or gas-meter body in seismic
zones 3 and 4.
[[Cast-iron] [or] [steel] body ball valve with flanged ends in accordance with ASME B16.38. Provide PTFE seats.]
[Cast-iron body plug valve in accordance with ASME B16.38, nonlubricated, wedge-mechanism or tapered lift plug,
and flanged ends.]
2.5.2 Shutoff Valves, Sizes 50 Millimeters 2 Inches and Smaller
NOTE: Choose one of the options below.
[[Bronze] [Steel] body ball valve in accordance with ASME B16.33, full port pattern, reinforced PTFE seals, threaded
ends, and PTFE seat.]
[[Bronze] [Steel] body plug valve in accordance with ASME B16.33, straightway, taper plug, regular pattern with
a port opening at least equal to the internal pipe area or round port full bore pattern, non-lubricated, PTFE
packing, flat or square head stem with lever operator, 860 kPa (gage) 125 psig rating, threaded ends.]
2.5.3 Pressure Regulator
Self-contained with spring-loaded diaphragm pressure regulator, kPa to mm psig to inches water reduction, pressure
operating range as required for the pressure reduction indicated, volume capacity not less than indicated, and
threaded ends for sizes 50 mm 2 inches and smaller, otherwise flanged.
2.5.4 Earthquake Automatic Gas Shutoff Valve
NOTE: Provide this earthquake protective feature primarily for seismic zones
3 and 4.
ASCE 25 and UL listed or AGA listed or International Association of Plumbing and Mechanical Officials (IAPMO)
listed. The valve may be either pendulum or ball construction with [remote [, pneumatic] [electronic] [or] [electric]]
actuator.
2.6 GAS METER
NOTE: Do not use cast-iron material for valve body or gas-meter body in seismic
zones 3 and 4.
[AGA B109.1] [AGA B109.2] [AGA B109.3] [pipe] [pedestal] mounted, [diaphragm] or [bellow] [style], [cast-iron]
[enamel coated steel] [aluminum] case. Provide combined register totalizer, water escape hole in housing, and
means for sealing against tampering.
2.7 GAS EQUIPMENT CONNECTORS
a. Flexible Connectors: ANSI Z21.45.
b. Quick Disconnect Couplings: CSA/AM Z21.41.
c. Semi-Rigid Tubing and Fittings: CSA/AM Z21.69.
2.8 VALVE BOX
Provide [street valve box with cast-iron cover and two-piece 130 mm 5 1/4 inch shaft-slip valve box extension]
[rectangular concrete valve box, sized large enough for removal of valve without removing box]. Cast the word
"Gas" into the box cover. Use valve box for areas as follows:
a. Roads and Traffic Areas: Heavy duty, cast iron cover.
b. Other Areas: Standard duty, concrete cover.
[c. Airfields and Special Loadings: As detailed.]
2.9 CASING
Where indicated at railroad or other crossing, provide ASTM A 53/A 53M, galvanized pipe, Schedule 40 [, with
extruded polyethylene coating].
2.10 BURIED UTILITY WARNING AND IDENTIFICATION TAPE
Provide detectable aluminum-foil plastic-backed tape or detectable magnetic plastic tape manufactured specifically
for warning and identification of buried piping. Tape shall be detectable by an electronic detection instrument.
Provide tape in rolls, 75 mm 3 inch minimum width, color-coded yellow for natural gas, with warning and identification
imprinted in bold black letters continuously and repeatedly over entire tape length. Warning and identification
shall be "CAUTION BURIED GAS PIPING BELOW" or similar wording. Use permanent code and letter coloring unaffected
by moisture and other substances contained in trench backfill material.
2.11 HANGERS AND SUPPORTS
MSS SP-58, as required by MSS SP-69.
2.12 WELDING FILLER METAL
ASME B31.8.
2.13 PIPE-THREAD TAPE
Antiseize and sealant tape of polytetrafluoroethylene (PTFE).
2.14 BOLTING (BOLTS AND NUTS)
Stainless steel bolting; ASTM A 193/A 193M, Grade B8M or B8MA, Type 316, for bolts; and ASTM A 194/A 194M, Grade
8M, Type 316, for nuts. Dimensions of bolts, studs, and nuts shall conform with ASME B18.2.1and ASME B18.2.2
with coarse threads conforming to ASME B1.1, with Class 2A fit for bolts and studs and Class 2B fit for nuts.
Bolts or bolt-studs shall extend through the nuts and may have reduced shanks of a diameter not less than the
diameter at root of threads. Bolts shall have American Standard regular square or heavy hexagon heads; nuts
shall be American Standard heavy semifinished hexagonal.
2.15 GASKETS
Fluorinated elastomer, compatible with flange faces.
2.16 IDENTIFICATION FOR ABOVEGROUND PIPING
MIL-STD-101 for legends and type and size of characters. For pipes 19 mm 3/4 inch od and larger, provide printed
legends to identify contents of pipes and arrows to show direction of flow. Color code label backgrounds to
signify levels of hazard. Make labels of plastic sheet with pressure-sensitive adhesive suitable for the intended
application. For pipes smaller than 19 mm3/4 inch od, provide brass identification tags 40 mm 1 1/2 inches in
diameter with legends in depressed black-filled characters.
[2.17 (LIQUEFIED PETROLEUM GAS) LPG CONTAINERS AND ACCESSORIES
NOTE: The maximum size permitted under DOT specifications is 0.50 cubic meter
1,000 pounds water capacity. Fuse plugs may be used in addition to the spring-loaded
safety relief valves for aboveground ASME containers of 4 1/2 cubic meters 1,200
gallons water capacity or less.
NFPA 58, [DOT] [or] [ASME] containers with appurtenances, system working pressure, minimum design pressure, that
is LPG vapor pressure at 38 degrees C 100 degrees F, and water capacity as indicated. Provide containers with
piping and fittings, [fuse plugs], [hose and flexible hose connectors], [gas-air mixer], strainer, and marking
conforming to NFPA 58.
]PART 3 EXECUTION
3.1 INSTALLATION
NOTE: To assist the designer in selecting the proper documents for a specific
project, the following scope in accordance with documents is provided:
1. NFPA 54 Scope: "1.1.1 Applicability: ... Coverage of piping systems extends
from the point of delivery to the connections with each gas utilization device.
For other than indicated liquified petroleum gas systems, the point of delivery
is the outlet of the service meter assembly, or the outlet of the service regulator
or service shutoff valve when no gas meter is provided. For undiluted liquified
petroleum gas systems, the point of delivery is the outlet of the first stage
pressure regulator..."
2. ASME B31.8 Scope: "802.11... This code covers the design, fabrication,
installation, inspection, testing and safety aspects of operation and maintenance
of gas transmission and distribution systems, including gas pipelines, gas compressor
stations, gas metering and regulation stations, gas mains, and service lines
up to the outlet of the customer's meter set assembly....802.14 This code does
not apply to....(c) piping beyond the outlet of the customers meter set assembly..."
Install gas piping, appliances, and equipment in accordance with NFPA 54. [Install distribution piping in accordance
with ASME B31.8.] [Install and store liquefied petroleum gas piping, appliances, and equipment in accordance
with NFPA 58.]
3.1.1 Excavating and Backfilling
Perform excavating and backfilling of pipe trenches as specified in Section 31 00 00 EARTHWORK. Place pipe directly
in trench bottom and cover with minimum 75 mm 3 inches of sand to top of pipe. If trench bottom is rocky, place
pipe on a 75 mm 3 inch bed of sand and cover as above. Provide remaining backfilling. Coordinate provision
of utility warning and identification tape with backfill operation. Bury utility warning and identification
tape with printed side up at a depth of 305 mm 12 inches below the top surface of earth or the top surface of
the subgrade under pavements.
3.1.2 Piping
Cut pipe to actual dimensions and assemble to prevent residual stress. [Provide supply connections entering the
buildings as indicated.] Within buildings, run piping parallel to structure lines and conceal in finished spaces.
Terminate each vertical supply pipe to burner or appliance with tee, nipple and cap to form a sediment trap.
To supply multiple items of gas-burning equipment, provide manifold with inlet connections at both ends.
3.1.2.1 Cleanliness
Clean inside of pipe and fittings before installation. Blow lines clear using 550 to 690 kPa (gage) 80 to 100
psig clean dry compressed air. Rap steel lines sharply along entire pipe length before blowing clear. Cap or
plug pipe ends to maintain cleanliness throughout installation.
3.1.2.2 Aboveground Steel Piping
Determine and establish measurements for piping at the job site and accurately cut pipe lengths accordingly.
For 50 mm 2 inch diameter and smaller, use threaded or socket-welded joints. For 65 mm 2 1/2 inch diameter and
larger, use flanged or butt-welded joints.
a. Threaded Joints: Where possible use pipe with factory-cut threads, otherwise cut pipe ends
square, remove fins and burrs, and cut taper pipe threads in accordance with ASME B1.20.1.
Provide threads smooth, clean, and full-cut. Apply anti-seize paste or tape to male threads
portion. Work piping into place without springing or forcing. Backing off to permit alignment
of threaded joints will not be permitted. Engage threads so that not more than three threads
remain exposed. Use unions for connections to [valves] [meters] for which a means of disconnection
is not otherwise provided.
b. Welded Joints: Weld by the shielded metal-arc process, using covered electrodes and in
accordance with procedures established and qualified in accordance with ASME B31.8.
c. Flanged Joints: Use flanged joints for connecting welded joint pipe and fittings to valves
to provide for disconnection. Install joints so that flange faces bear uniformly on gaskets.
Engage bolts so that there is complete threading through the nuts and tighten so that bolts
are uniformly stressed and equally torqued.
d. Pipe Size Changes: Use reducing fittings for changes in pipe size. Size changes made with
bushings will not be accepted.
e. Painting: Paint new ferrous metal piping, including supports, in accordance with Section
09 90 00 PAINTS AND COATINGS. Do not apply paint until piping tests have been completed.
f. Identification of Piping: Identify piping aboveground in accordance with MIL-STD-101, using
adhesive-backed or snap-on plastic labels and arrows. In lieu of labels, identification tags
may be used. Apply labels or tags to finished paint at intervals of not more than 15 meters
50 feet. Provide two copies of the piping identification code framed under glass and install
where directed.
3.1.2.3 Buried Plastic Lines
Provide totally PE piping. Prior to installation, obtain printed instructions and technical assistance in proper
installation techniques from pipe manufacturer. [When joining new PE pipe to existing pipe line, ascertain what
procedural changes in the fusion process is necessary to attain optimum bonding.]
a. PE Piping: Prior to installation, Contractor shall have supervising and installing personnel,
certified in accordance with paragraph entitled "Welder's Qualifications." Provide fusion-welded
joints except where transitions have been specified. Use electrically heated tools, thermostatically
controlled and equipped with temperature indication. (Where connection must be made to existing
plastic pipe, contractor shall be responsible for determination of compatibility of materials
and procedural changes in fusion process necessary to attain maximum integrity of bond.)
b. Laying PE Pipe: Bury pipe 600 mm 24 inches below finish grade [or deeper when indicated].
Lay in accordance with manufacturer's printed instructions.
3.1.2.4 Connections to Existing Pipeline
When making connections to live gas mains, use pressure tight installation equipment operated by workmen trained
and experienced in making hot taps. For connections to existing underground pipeline or service branch, use transition
fittings for dissimilar materials.
3.1.2.5 Wrapping
Where connection to existing steel line is made underground, tape wrap new steel transition fittings and exposed
existing pipe having damaged coating. Clean pipe to bare metal. Initially stretch first layer of tape to conform
to the surface while spirally half-lapping. Apply a second layer, half-lapped and spiralled as the first layer,
but with spirals perpendicular to first wrapping. Use 0.025 mm 10 mil minimum thick polyethylene tape. In lieu
of tape wrap, heat shrinkable 0.025 mm 10 mil minimum thick polyethylene sleeve may be used.
3.1.3 Valves
Install valves approximately at locations indicated. Orient stems vertically, with operators on top, or horizontally.
[Provide support for valves to resist operating torque applied to PE pipes.]
3.1.3.1 Pressure Regulator
Provide [plug cock] [or] [ball valve] ahead of regulator. [Install regulator outside of building and 450 mm
18 inches aboveground on riser.] [Install regulator inside building and extend a full-size vent line from relief
outlet on regulator to a point outside of building.] [Install gas meter in conjunction with pressure regulator].
On outlet side of [regulator] [meter], provide a union and a 10 mm 3/8 inch gage tap with plug.
3.1.3.2 Stop Valve and Shutoff Valve
Provide stop valve on service branch at connection to main and shut-off valve on riser outside of building.
3.1.4 Pipe Sleeves
[Comply with Section 07 84 00 FIRESTOPPING.] Where piping penetrates concrete or masonry wall, floor or firewall,
provide pipe sleeve poured or grouted in place. Make sleeve of steel or cast-iron pipe of such size to provide
6 mm 1/4 inch or more annular clearance around pipe. Extend sleeve through wall or slab and terminate flush
with both surfaces. Pack annular space with oakum, and caulk at ends with silicone construction sealant.
3.1.5 Piping Hangers and Supports
NOTE: In seismic zone 3 or 4, provide seismic restraints in accordance with
SMACNA Seismic Restraint Mnl.
Selection, fabrication, and installation of piping hangers and supports shall conform with MSS SP-69 and MSS SP-89
, unless otherwise indicated. [Provide seismic restraints in accordance with SMACNA 1650.]
3.1.6 Final Connections
Make final connections to equipment and appliances using rigid pipe and fittings, except for the following:
3.1.6.1 Domestic Water Heaters
Connect with AGA-Approved semi-rigid tubing and fittings.
3.1.6.2 Kitchen Equipment
Install AGA-Approved gas equipment connectors. Connectors shall be long enough [to permit movement of equipment
for cleaning] [and] [to afford access to coupling].
3.2 FIELD QUALITY CONTROL
3.2.1 Metal Welding Inspection
NOTE: To assist the designer in selecting the proper documents for a specific
project, the following scope in accordance with documents is provided:
1. NFPA 54 Scope: "1.1.1 Applicability: ... Coverage of piping systems extends
from the point of delivery to the connections with each gas utilization device.
For other than indicated liquified petroleum gas systems, the point of delivery
is the outlet of the service meter assembly, or the outlet of the service regulator
or service shutoff valve when no gas meter is provided. For undiluted liquified
petroleum gas systems, the point of delivery is the outlet of the first stage
pressure regulator..."
2. ASME B31.8 Scope: "802.11... This code covers the design, fabrication,
installation, inspection, testing and safety aspects of operation and maintenance
of gas transmission and distribution systems, including gas pipelines, gas compressor
stations, gas metering and regulation stations, gas mains, and service lines
up to the outlet of the customer's meter set assembly....802.14 This code does
not apply to....(c) piping beyond the outlet of the customers meter set assembly..."
Inspect for compliance with [NFPA 54] [and] [ASME B31.8]. Replace, repair, and then re-inspect defective welds.
3.2.2 PE Fusion Welding Inspection
Visually inspect butt joints by comparing with, manufacturer's visual joint appearance chart. Inspect fusion
joints for proper fused connection. Replace defective joints by cutting out defective joints or replacing fittings.
Inspect 100 percent of all joints and reinspect all corrections. Arrange with the pipe manufacturer's representative
in the presence of the Contracting Officer to make first time inspection.
3.2.3 Pressure Tests
NOTE: To assist the designer in selecting the proper documents for a specific
project, the following scope in accordance with documents is provided:
1. NFPA 54 Scope: "1.1.1 Applicability: ... Coverage of piping systems extends
from the point of delivery to the connections with each gas utilization device.
For other than indicated liquified petroleum gas systems, the point of delivery
is the outlet of the service meter assembly, or the outlet of the service regulator
or service shutoff valve when no gas meter is provided. For undiluted liquified
petroleum gas systems, the point of delivery is the outlet of the first stage
pressure regulator..."
2. ASME B31.8 Scope: "802.11... This code covers the design, fabrication,
installation, inspection, testing and safety aspects of operation and maintenance
of gas transmission and distribution systems, including gas pipelines, gas compressor
stations, gas metering and regulation stations, gas mains, and service lines
up to the outlet of the customer's meter set assembly....802.14 This code does
not apply to....(c) piping beyond the outlet of the customers meter set assembly..."
Use test pressure of 1 1/2 times maximum working pressure, but in no case less than 350 kPa (gage) 50 psig.
Do not test until every joint has set and cooled at least 8 hours at temperatures above 10 degrees C 50 degrees
F. Conduct testing before backfilling; however, place sufficient backfill material between fittings to hold
pipe in place during tests. Test system gas tight in accordance with [NFPA 54] [or] [ASME B31.8]. Use clean
dry air or inert gas, such as nitrogen or carbon dioxide, for testing. Systems which may be contaminated by
gas shall first be purged as specified. Make tests on entire system or on sections that can be isolated by valves.
After pressurization, isolate entire piping system from sources of air during test period. Maintain test pressure
for at least 8 hours between times of first and last reading of pressure and temperature. Take first reading
at least one hour after test pressure has been applied. Do not take test readings during rapid weather changes.
Provide temperature same as actual trench conditions. There shall be no reduction in the applied test pressure
other than that due to a change in ambient temperature. Allow for ambient temperature change in accordance with
the relationship PF + 101.32 = (P1 + 101.32) (T2 + 273) / T1 + 273) PF + 14.7 = (P1 + 14.7) (T2 + 460) / T1 +
460), in which "T" and "PF" represent Centigrade Fahrenheit temperature and gage pressure, respectively, subscripts
"1" and "2" denote initial and final readings, and "PF" is the calculated final pressure. If "PF" exceeds the
measured final pressure (final gage reading) by 3 1/2 kPa 1/2 psi or more, isolate sections of the piping system,
retest each section individually, and apply a solution of warm soapy water to joints of each section for which
a reduction in pressure occurs after allowing for ambient temperature change. Repair leaking joints and repeat
test until no reduction in pressure occurs. In performing tests, use a test gage calibrated in 7 kPa one psi
increments and readable to 3 1/2 kPa 1/2 psi.
3.2.4 System Purging
NOTE: To assist the designer in selecting the proper documents for a specific
project, the following scope in accordance with documents is provided:
1. NFPA 54 Scope: "1.1.1 Applicability: ... Coverage of piping systems extends
from the point of delivery to the connections with each gas utilization device.
For other than indicated liquified petroleum gas systems, the point of delivery
is the outlet of the service meter assembly, or the outlet of the service regulator
or service shutoff valve when no gas meter is provided. For undiluted liquified
petroleum gas systems, the point of delivery is the outlet of the first stage
pressure regulator..."
2. ASME B31.8 Scope: "802.11... This code covers the design, fabrication,
installation, inspection, testing and safety aspects of operation and maintenance
of gas transmission and distribution systems, including gas pipelines, gas compressor
stations, gas metering and regulation stations, gas mains, and service lines
up to the outlet of the customer's meter set assembly....802.14 This code does
not apply to....(c) piping beyond the outlet of the customers meter set assembly..."
After completing pressure tests, and before testing a gas contaminated line, purge line with nitrogen at junction
with main line to remove all air and gas. Clear completed line by attaching a test pilot fixture at capped stub-in
line at building location and let gas flow until test pilot ignites. Procedures shall conform to [NFPA 54] [and]
[ASME B31.8].
-CAUTION-
Failure to purge may result in explosion
within line when air-to-gas is at correct
mixture.
3.3 SCHEDULE
Some metric measurements in this section are based on mathematical conversion of inch-pound measurement, and
not on metric measurement commonly agreed to by the manufacturers or other parties. The inch-pound and metric
measurements shown are as follows:
Products Inch-Pound Metric
a. [_____ _____ _____]