USACE / NAVFAC / AFCESA / NASA UFGS-23 11 25 (November 2008)
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Preparing Activity: USACE Superseding
UFGS-23 11 23.00 10 (October 2007)
UFGS-23 11 23.00 40 (August 2008)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated March 2008
SECTION 23 11 25
FACILITY GAS PIPING
11/08
NOTE: This guide specification covers the requirements for low pressure facility
gas piping systems conforming to [NFPA 54/ANSI Z223.14] [NFPA 58] for non-industrial
uses.
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 Natural Gas (NG) and
Liquid Petroleum Gas (LPG) facility piping systems. Selection or deselection
of a tailoring option (select view-tailoring options) will include or exclude
that option in the section. Specific project editing is still required for
the resulting section.
PART 1 GENERAL
NOTE: This guide specification is intended for use when specifying the following
facility gas distribution systems:
low pressure natural gas systems, 34 kPa (5 psi) maximum, except for gas-air
mixtures within the flammable range are limited to 69 kPa (10 psi) maximum,
low pressure undiluted LPG systems, 140 kPa (20psi) maximum,
aboveground steel piping both outside (up to 1.50 meters (5 feet) beyond exterior
walls) and within buildings in compliance with [NFPA 54/ANSI Z223.14] [NFPA
58], "Fuel Gas Piping",
thermoplastic gas pressure pipe, tubing, and fittings,
aluminum and aluminum-alloy drawn seamless tubes,
reinforced epoxy resin gas pressure pipe and fittings,
for non-industrial uses.
Use Section 33 51 15 NATURAL-GAS / LIQUID PETROLEUM GAS DISTRIBUTION for external
utility (beyond 1.50 meters (5 feet) from exterior walls) [natural gas distribution]
[liquid petroleum gas (LPG)](includes tailoring for LPG systems).
Use Section 33 51 15 NATURAL-GAS / LIQUID PETROLEUM GAS DISTRIBUTION contains
tailoring for utility metering systems. (The Energy Independence and Security
Act (EISA 2007) requires equivalent metering of natural gas and steam in accordance
with the guidelines established under the act prior to October 1, 2016.)
As a minimum, show the following information 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. Meter location and emergency shut-offs.
6. Location and capacity of LP gas containers.
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 B109.3(2000)Rotary-Type Gas Displacement MetersAGA XR0603(2006) AGA Plastic Pipe Manual for Gas Service][AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)ANSI Z21.45(1995) Flexible Connectors of Other Than All-Metal Construction for Gas Appliances][AMERICAN PETROLEUM INSTITUTE (API)API 570(1998; Addendum 1 2000, Addendum 2 2001, Addendum 3 2003, Addendum 4 2006) Piping Inspection CodeAPI MPMS 2.2A(1995; R 2007) Manual of Petroleum Measurement Standard Chapter 2 - Tank Calibration Section 2A - Measurement and Calibration of Upright Cylindrical Tanks by the Manual Tank Strapping MethodAPI MPMS 2.2E(2004) Petroleum and Liquid Petroleum Products - Calibration of Horizontal Cylindrical Tanks - Part 1: Manual MethodsAPI RP 1110(2007) Pressure Testing of Liquid Petroleum PipelinesAPI RP 2003(2008) Protection Against Ignitions Arising out of Static, Lightning, and Stray CurrentsAPI RP 2009(2002) Safe Welding, Cutting, and Hot Work Practices in the Petroleum and Petrochemical IndustriesAPI Spec 15LR(2001) Specification for Low Pressure Fiberglass Line Pipe and FittingsAPI Spec 5CT(2005; Errata 2006; Errata 2006) Specification for Casing and TubingAPI Spec 6D(2008; Errata 2008; Errata 2008) Specification for Pipeline ValvesAPI Std 598(2004) Valve Inspecting and TestingAPI Std 607(2005; Errata 2008) Fire Test for Soft-Seated Quarter-Turn Valves][AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)ASCE 25(2008) Standard for Earthquake-Activated Automatic Gas Shutoff Devices][AMERICAN WELDING SOCIETY (AWS)AWS A5.8/A5.8M(2004; Errata 2004) Specification for Filler Metals for Brazing and Braze WeldingAWS WHB-2.9(2004) Welding Handbook; Volume Two - Welding Processes][ASME INTERNATIONAL (ASME)ASME A13.1(2007) Scheme for the Identification of Piping SystemsASME B1.20.1(1983; R 2006) Pipe Threads, General Purpose (Inch)ASME B16.1(2005) Standard for Gray Iron Threaded Fittings; Classes 125 and 250ASME B16.11(2005) Forged Fittings, Socket-Welding and ThreadedASME B16.21(2005) Nonmetallic Flat Gaskets for Pipe FlangesASME 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 B16.39(1998; R 2006) Standard for Malleable Iron Threaded Pipe Unions; Classes 150, 250, and 300ASME 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 B31.9(2008) Building Services PipingASME B36.10M(2004) Standard for Welded and Seamless Wrought Steel PipeASME B40.100(2005) Pressure Gauges and Gauge AttachmentsASME BPVC SEC IX(2007; Addenda 2008) Boiler and Pressure Vessel Code; Section IX, Welding and Brazing QualificationsASME BPVC SEC VIII D1(2007; Addenda 2008) Boiler and Pressure Vessel Code; Section VIII, Pressure Vessels Division 1 - Basic Coverage][ASTM INTERNATIONAL (ASTM)ASTM 01.01(2009) Steel - Piping, Tubing, FittingsASTM A 105/A 105M(2005) Standard Specification for Carbon Steel Forgings for Piping ApplicationsASTM A 181/A 181M(2006) Standard Specification for Carbon Steel Forgings, for General-Purpose PipingASTM A 513(2008a) Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical TubingASTM A 53/A 53M(2007) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessASTM A 666(2003) Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat BarASTM B 210(2004) Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless TubesASTM B 210M(2005) Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes (Metric)ASTM B 241/B 241M(2002) Standard Specification for Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded TubeASTM B 280(2008) Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field ServiceASTM B 88(2003) Standard Specification for Seamless Copper Water TubeASTM B 88M(2005) Standard Specification for Seamless Copper Water Tube (Metric)ASTM D 2513(2008b) Thermoplastic Gas Pressure Pipe, Tubing, and FittingsASTM D 2517(2006) Reinforced Epoxy Resin Gas Pressure Pipe and FittingsASTM F 2015(2000) Standard Specification for Lap Joint Flange Pipe End Applications][CANADIAN STANDARDS ASSOCIATION (CSA)CSA 3.11-CAN/CGA(1988; R 2003) Lever Operated Pressure Lubricated Plug Type Gas Shut-Off ValvesCSA CGA 3.16-M88(1988; R 2003) Lever Operated Non-Lubricated Gas Shut-Off ValvesCSA CGA 9.2(1988; R 2003) Manually Operated Shut-Off Valves for Gas Piping Systems - First Edition; General Instruction No 1][CSA AMERICA, INC. (CSA/AM)CSA/AM ANSI Z21.1(2005; Addenda A 2007; Addenda B 2008) Household Cooking Gas AppliancesCSA/AM Z21.15(1997; R 2003; A 2006) Manually Operated Gas Valves for Appliances, Appliance Connector Valves and Hose End ValvesCSA/AM Z21.18(2007) Gas Appliance Pressure RegulatorsCSA/AM Z21.21(2005) Automatic Valves for Gas AppliancesCSA/AM Z21.24(2006) Connectors for Gas AppliancesCSA/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 AppliancesCSA/AM Z21.78(2005; Addenda A 2007; Addenda B 2008) Standard Specification for Combination Gas Controls for Gas AppliancesCSA/AM Z21.80(2005; Addenda 2005; R 2008) Line Pressure Regulators][MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS INDUSTRY (MSS)MSS SP-25(2008) Standard Marking System for Valves, Fittings, Flanges and UnionsMSS 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-83(2006) Standard for Class 3000 Steel Pipe Unions Socket Welding and ThreadedMSS SP-86(2002) Guidelines for Metric Data in Standards for Valves, Flanges, Fittings and Actuators][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 CodeNFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition][SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION (SMACNA)SMACNA 1650(1998; Addendum 2000) Seismic Restraint Manual Guidelines for Mechanical Systems - Second Edition][THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)SSPC SP 6(7) Commercial Blast Cleaning][UNDERWRITERS LABORATORIES (UL)UL 125(2007) Standard for Valves for Anhydrous Ammonia and LP-Gas (Other than Safety Relief)UL 842(2007) Standard for Valves for Flammable FluidsUL 860(2001) Standard for Pipe Unions for Flammable and Combustible Fluids and Fire-Protection ServiceUL Gas&Oil Dir(2008) Flammable and Combustible Liquids and Gases Equipment Directory]
1.2 SYSTEM DESCRIPTION
The gas piping system includes natural gas liquid petroleum piping and appurtenances from point of connection
with supply system, as indicated, to gas operated equipment within the facility. Submit operation and maintenance
data in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA, in three separate packages. Section
23 03 00.00 20 BASIC MECHANCIAL MATERIALS AND METHODS applies to this section, with additions and modifications
specified herein. [Provide cathodically protected insulating joints connecting aboveground piping from the meter
to the building, with [lightning arrestors] [zinc grounding cells] conforming to API RP 2003, installed where
indicated.]
1.2.1 Gas Facility System and Equipment Operation
Include shop drawings showing piping layout, locations of system valves, gas line markers[ and cathodic protection
system]; step-by-step procedures for system start up, operation and shutdown (index system components and equipment
to the system drawings); isolation procedures including valve operation to shutdown or isolate each section of
the system (index valves to the system maps and provide separate procedures for normal operation and emergency
shutdown if required to be different). Submit Data package No. 4.
1.2.2 Gas Facility System Maintenance
Include maintenance procedures and frequency for system and equipment; identification of pipe materials and manufacturer
by locations, pipe repair procedures, and jointing procedures at transitions to other piping material or material
from a different manufacturer. Submit Data Package No.4.
1.2.3 Gas Facility Equipment Maintenance
Include identification of valves, shut-offs, disconnects, and other equipment by materials, manufacturer, vendor
identification and location; maintenance procedures and recommended tool kits for valves and equipment; recommended
repair methods (i.e., field repair, factory repair, or replacement) for each valve and piece of equipment; and
preventive maintenance procedures, possible failure modes and troubleshooting guide. Submit Data Package No.
3.
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
Gas Piping System[; G][; G, [_____]]
SD-03 Product Data
Pipe and Fittings[; G][; G, [_____]]
Gas equipment connectors[; G][; G, [_____]]
[LPG containers and accessories[; G][; G, [_____]]]
Gas Piping System[; G][; G, [_____]]
Pipe Coating Materials and application procedures[; G][; G, [_____]]
Pressure regulators[; G][; G, [_____]]
Risers[; G][; G, [_____]]
Transition fittings[; G][; G, [_____]]
Valves[; G][; G, [_____]]
Valve box[; G][; G, [_____]]
Warning and identification tape[; G][; G, [_____]]
SD-06 Test Reports
Testing[; G][; G, [_____]]
Pressure Tests[; G][; G, [_____]]
Pressure Tests for Liquified Petroleum Gas[; G][; G, [_____]]
Test With Gas[; G][; G, [_____]]
SD-07 Certificates
Welders procedures and qualifications[; G][; G, [_____]]
assigned number, letter, or symbol[; G][; G, [_____]]
SD-08 Manufacturer's Instructions
PE pipe and fittings[; G][; G, [_____]]
pipe coating materials and application procedures[; G][; G, [_____]]
SD-10 Operation and Maintenance Data
Gas facility system and equipment operation[; G][; G, [_____]]
Gas facility system maintenance[; G][; G, [_____]]
Gas facility equipment maintenance[; G][; G, [_____]]
Data packages, as specified.
1.4 QUALITY ASSURANCE
Submit manufacturer's descriptive data and installation instructions for approval for compression-type mechanical
joints used in joining dissimilar materials and for insulating joints. Mark all valves, flanges and fittings
in accordance with MSS SP-25.
1.4.1 Welding Qualifications
NOTE: When the need exists for more stringent welding requirements, the designer
may develop an alternate paragraph from industry standards using the applicable
portions of Section 43 02 00 WELDING PRESSURE PIPING as a guide.
a. Weld piping in accordance with qualified procedures using performance qualified welders and welding
operators in accordance with API RP 2009, ASME BPVC SEC IX, and ASME B31.9. Welding procedures qualified
by others, and welders and welding operators qualified by another employer may be accepted as permitted
by ASME B31.9. Notify the Contracting Officer at least 24 hours in advance of tests, and perform at
the work site if practicable.
b. Submit a certified copy of welders procedures and qualifications metal and PE in conformance with
ASME B31.9 for each welder and welding operator. Submit the assigned number, letter, or symbol that
will be used in identifying the work of each welder to the Contracting Officer.[ Weld all structural
members in accordance with Section 05 05 23 WELDING, STRUCTURAL, and in conformance with AWS A5.8/A5.8M
, and AWS WHB-2.9.]
1.4.2 Jointing Thermoplastic and Fiberglass Piping
Perform all jointing of piping using qualified joiners and qualified procedures in accordance with AGA XR0603
. Furnish the Contracting Officer with a copy of qualified procedures and list of and identification symbols
of qualified joiners. Submit manufacturer's installation instructions and manufacturer's visual joint appearance
chart, including all PE pipe and fittings.
1.4.3 Shop Drawings
Submit drawings for complete Gas Piping System, within [30] [_____] days of contract award, showing location,
size and all branches of pipeline; location of all required shutoff valves; and instructions necessary for the
installation of gas equipment connectors and supports. Include LP storage tank, pad, and mounting details.
1.5 DELIVERY, STORAGE, AND HANDLING
Handle, transport, and store plastic pipe and fittings carefully. Plug or cap pipe and fittings ends during
transportation or storage to minimize dirt and moisture entry. Do not subject piping to abrasion or concentrated
external loads. Discard PE pipe sections and fittings that have been damaged.
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 the products and that essentially duplicate items that have been in satisfactory use for at least 2 years
prior to bid opening. Asbestos or products containing asbestos are not allowed. Submit catalog data and installation
instructions for pipe, valves, all related system components, pipe coating materials and application procedures
. Conform to NFPA 54 NFPA 58 and with requirements specified herein. Provide supply piping to appliances or
equipment at least as large as the inlets thereof.
2.2 GAS PIPING SYSTEM AND FITTINGS
NOTE: When acceptable to the serving gas supplier aluminum, thermoplastic or
fiberglass pipe; copper, aluminum alloy, or steel tubing may be used with gases
not corrosive to such materials. Before selecting aluminum, copper, thermoplastic
or fiberglass materials, contact the gas supplier for a gas analysis to determine
the types of chemicals which will be in the gas supply, and select suitable
materials based on the gas analysis. In general, odorized gas is not suitable
for aluminum or copper bearing materials.
[2.2.1 Steel Pipe, Joints, and Fittings
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 carbon 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: MSS SP-83ASME 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, with flange faces having integral grooves of rectangular cross sections which
afford containment for self-energizing gasket material.
NOTE: Other materials, such as threaded ductile iron, copper or brass pipe
in iron pipe sizes, may be used with gases noncorrosive to such materials.
Designer may specify other approved materials and list proper reference publications
based on those materials in this paragraph and reference paragraph. Designer
also may delete materials or equipment listed if not desirable or applicable.
Provide steel pipe conforming to ASME B36.10M; and malleable-iron threaded fittings conforming to MSS SP-86 ASME B16.1
and ASME B16.3. Provide steel pipe flanges and flanged fittings, including bolts, nuts, and bolt pattern in
accordance with ASME B16.5 and ASTM A 105/A 105M. Provide wrought steel buttwelding fittings conforming to ASME B16.9
. Provide socket welding and threaded forged steel fittings conforming to MSS SP-83 ASME B16.11[ and ASTM A 181/A 181M
, Class 60].
][2.2.2 Aluminum Alloy Pipe and Tubing, Joints, and Fittings
Provide aluminum alloy pipe conforming to ASTM B 241/B 241M, except that alloy 5456 is not allowed. Mark the
ends of each length of pipe indicating it conforms to NFPA 54 NFPA 58. Thread, flange, braze, or weld pipe joints.
Provide aluminum alloy tubing conforming to ASTM B 210M ASTM B 210, Type A or B, or ASTM B 241/B 241M, Type A
or equivalent, with joints made up with gas tubing fittings recommended by the tubing manufacturer.
][2.2.3 Copper Tubing, Joints and Fittings
Provide copper tubing conforming to ASTM B 88M ASTM B 88, Type K or L, or ASTM B 280, with tubing joints made
up with tubing fittings recommended by the tubing manufacturer. Provide copper and copper alloy press fittings,
with sealing elements of Hydrogenated Nitrile Butadiene Rubber (HNBR), factory installed, or an alternative supplied
by the fitting manufacturer.
][2.2.4 Steel Tubing, Joints and Fittings
Provide steel tubing conforming to ASTM 01.01, and ASTM A 513, with tubing joints made up with gas tubing fittings
recommended by the tubing manufacturer.
][2.2.5 Thermoplastic Pipe, Tubing, Joints, and Fittings
NOTE: Use of thermoplastic pipe or components is not allowed under buildings.
Use only for outdoor, underground installations only.
Provide thermoplastic pipe, tubing,casing and joints and fittings conforming to ASTM D 2513 and API Spec 5CT.
][2.2.6 Fiberglass Pipe, Joints, and Fittings
Provide fiberglass piping systems conforming to ASTM D 2517 and API Spec 15LR.
][2.2.7 Sealants for Steel Pipe Threaded Joints
NOTE: Use this paragraph only if steel threaded pipe is specified.
Provide joint sealing compound as listed in UL Gas&Oil Dir, Class 20 or less. For taping, use tetrafluoroethlene
tape conforming to UL Gas&Oil Dir.
]2.2.8 Warning and Identification
Provide pipe flow markings, warning and identification tape, and metal tags as required.
2.2.9 Flange Gaskets
Provide gaskets of nonasbestos compressed material in accordance with ASME B16.21, 1.6 mm 1/16 inch thickness,
full face or self-centering flat ring type, containing aramid fibers bonded with styrene butadiene rubber (SBR)
or nitrile butadiene rubber (NBR) suitable for a maximum 316 degrees C 600 degree F service, to be used for hydrocarbon
service.
2.2.10 Pipe Threads
Provide pipe threads conforming to ASME B1.20.1.
2.2.11 Escutcheons
Provide chromium-plated steel or chromium-plated brass escutcheons, either one piece or split pattern, held in
place by internal spring tension or set screw.
2.2.12 Gas Transition Fittings
NOTE: Choose the applicable options from the following:
[a. Provide steel to plastic (PE) designed for steel-to-plastic with tapping tee or sleeve conforming
to AGA XR0603 requirements for transitions fittings.. 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 conforming to ASTM A 666, 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.]]
[c.[ Provide lever operated pressure lubricated plug type gas shut-off valve conforming to CSA 3.11-CAN/CGA
.][ Provide lever operated non-lubricated gas shut-off valves conforming to CSA CGA 3.16-M88][ Provide
manually operated shut-off valve conforming to CSA CGA 9.2]]
2.2.13 Insulating Pipe Joints
2.2.13.1 Insulating Joint Material
Provide insulating joint material between flanged or threaded metallic pipe systems where shown to control galvanic
or electrical action.
2.2.13.2 Threaded Pipe Joints
Provide threaded pipe joints of steel body nut type dielectric unions with insulating gaskets.
2.2.13.3 Flanged Pipe Joints
Provide joints for flanged pipe consisting of full face sandwich-type flange insulating gasket of the dielectric
type, insulating sleeves for flange bolts, and insulating washers for flange nuts. [Provide lap joint flange
pipe ends conforming to ASTM F 2015.]
2.2.14 Flexible Connectors
a. Provide flexible connectors for connecting gas utilization equipment to building gas piping conforming
to CSA/AM Z21.24, ANSI Z21.45, or CSA/AM Z21.41 for quick disconnect devices, and flexible connectors
for movable food service equipment conforming to CSA/AM Z21.69.[ Provide combination gas controls for
gas appliances conforming to CSA/AM Z21.78.]
b. Do not install the flexible connector through the appliance cabinet face. Provide rigid metallic
pipe and fittings to extend the final connection beyond the cabinet, except when appliance is provided
with an external connection point.
2.3 VALVES
Provide [lockable ]shutoff or service isolation valves [as indicated in the drawings ]conforming to the following:
2.3.1 Valves 50 mm 2 Inches and Smaller
Provide valves 50 mm 2 inches and smaller conforming to ASME B16.33 of materials and manufacture compatible with
system materials used.[ Provide manually operated household cooking gas appliance valves conforming to CSA/AM ANSI Z21.1
and CSA/AM Z21.15.]
[2.3.2 Valves 65 mm 2-1/2 Inches and Larger
NOTE: Use the following for projects requiring larger volumes and pipe sizes
over 2-1/2 inches.
Provide valves 65 mm 2-1/2 inches and larger of carbon steel conforming to API Spec 6D, Class 150.
]2.4 RISERS
Provide 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 on the drawings].
2.5 PIPE HANGERS AND SUPPORTS
Provide pipe hangers and supports conforming to MSS SP-58 and MSS SP-69.
[2.6 [METERING, ]REGULATORS AND SHUTOFF VALVES
NOTE: Interior and/or exterior metering, pressure regulating, and primary shutoff
valves for gas fuel systems are specified in Section 33 51 15 NATURAL-GAS /
LIQUID PETROLEUM GAS DISTRIBUTION. If that section is not a part of the contract
specifications, applicable paragraphs should be specified in this specification.
[Provide [diaphragm-type meter conforming to AGA B109.1] [rotary-type displacement meter conforming to AGA B109.3
] as required by local gas utility supplier,[ including valve box] conforming to NFPA 54.] Provide pressure
gauges and attachments conforming to ASME B40.100. Provide regulators conforming to [CSA/AM Z21.18 for appliances]
[CSA/AM Z21.78 for combination gas controls for gas appliances] [, and CSA/AM Z21.80 for line pressure regulators
]. Provide shutoff valves conforming to [CSA/AM Z21.15 for manually controlled gas shutoff valves] [and] [CSA/AM Z21.21
for automatic shutoff valves for gas appliances].
][2.7 SEISMIC PROVISIONS
NOTE: Provide this earthquake protective feature primarily for seismic zones
3 and 4.
Provide earthquake automatic gas shutoff valve conforming to ASCE 25, SMACNA 1650, 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.
]2.8 LIQUIFIED PETROLEUM GAS - (LPG), 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 4.5 cubic meters (1,200
gallons) water capacity or less.
Provide NFPA 58, [DOT] [or] [ASME] compliant 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, and[ API MPMS 2.2A for upright cylindrical tanks] [API MPMS 2.2E
for horizontal cylindrical tanks] Provide valves conforming to UL 125 and UL 842. Provide pipe unions conforming
to UL 860.
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 or areas of conflict before performing the work.
3.2 EXCAVATION AND BACKFILLING
Provide required excavation, backfilling, and compaction as specified in Section 31 00 00 EARTHWORK.
3.3 GAS PIPING SYSTEM
Provide a gas piping system from the point of delivery, defined as the outlet of the [meter set assembly] [service
regulator] [shutoff valve], as specified in Section 33 51 15 NATURAL-GAS / LIQUID PETROLEUM GAS DISTRIBUTION,
to the connections to each gas utilization device.
3.3.1 Protection and Cleaning of Materials and Components
Protect equipment, pipe, and tube openings by closing with caps or plugs during installation. At the completion
of all work, thoroughly clean the entire system.
3.3.2 Workmanship and Defects
Piping, tubing and fittings shall be clear and free of cutting burrs and defects in structure or threading and
shall be thoroughly brushed and chip-and scale-blown. Repair of defects in piping, tubing or fittings is not
allowed; replace defective items when found.
3.4 PROTECTIVE COVERING
3.4.1 Underground Metallic Pipe
Protect buried metallic piping from corrosion with protective coatings as specified in Section 33 51 15 NATURAL-GAS
/ LIQUID PETROLEUM GAS DISTRIBUTION. When dissimilar metals are joined underground, use gastight insulating
fittings.
3.4.2 Aboveground Metallic Piping Systems
NOTE: This paragraph applies to normal interior and exterior conditions from
the meter or main shut-off. Where severe corrosion is expected, edit this paragraph
to provide for protection against corrosion.
3.4.2.1 Ferrous Surfaces
Touch up shop primed surfaces with ferrous metal primer. Solvent clean surfaces that have not been shop primed
. Mechanically clean surfaces that contain loose rust, loose mill scale and other foreign substances [by power
wire brushing] [or] [commercial sand blasted conforming to SSPC SP 6] and prime with [ferrous metal primer] [or]
[vinyl type wash coat]. Finish primed surfaces with two coats of exterior [oil paint] [or] [vinyl paint].
3.4.2.2 Nonferrous Surfaces
Except for aluminum alloy pipe, do not paint nonferrous surfaces. Paint surfaces of aluminum alloy pipe and
fittings to protect against external corrosion where they contact masonry, plaster, insulation, or are subject
to repeated wettings by such liquids as water, detergents or sewage. Solvent-clean the surfaces and treat with
vinyl type wash coat. Apply a first coat of aluminum paint and a second coat of alkyd gloss enamel or silicone
alkyd copolymer enamel.
3.5 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."
If underground piping is subject to physical damage, specify deeper burial depths
to protect piping.
Install the gas system in conformance with the manufacturer's recommendations and applicable provisions of NFPA 54
NFPA 58, AGA XR0603, and as indicated. Perform all pipe cutting without damage to the pipe, with an approved
type of mechanical cutter, unless otherwise authorized. Use wheel cutters where practicable. On steel pipe
150 mm 6 inches and larger, an approved gas cutting and beveling machine may be used. Cut thermoplastic and
fiberglass pipe in accordance with AGA XR0603.
3.5.1 Metallic Piping Installation
Bury underground piping a minimum of 450 mm 18 inches below grade. Make changes in direction of piping with
fittings only; mitering or notching pipe to form elbows and tees or other similar type construction is not permitted.
Branch connection may be made with either tees or forged branch outlet fittings. Provide branch outlet fittings
which are forged, flared for improvement of flow where attached to the run, and reinforced against external strains.
Do not use aluminum alloy pipe in exterior locations or underground.
3.5.2 Metallic Tubing Installation
Install metallic tubing using gas tubing fittings approved by the tubing manufacturer. Make branch connections
with tees. Prepare all tubing ends with tools designed for that purpose. Do not use aluminum alloy tubing in
exterior locations or underground.
3.5.3 Thermoplastic and Fiberglass Piping, Tubing, and Fittings
Installation of thermoplastic and fiberglass piping, tubing, and fittings is permitted only outside and underground.
Bury piping a minimum of 450 mm 18 inches below grade. Install the piping to avoid excessive stresses due to
thermal contraction, and use only where indicated.
3.5.4 Connections Between Metallic and Plastic Piping
Connections between metallic and plastic piping are only allowed outside, underground, and with approved transition
fittings.
3.5.5 Piping Buried Under Buildings
Run underground piping installed beneath buildings in a steel pipe casing protected from corrosion with protective
coatings as specified in Section 23 11 25 FACILITY GAS PIPING. Extend casing at least 100 mm 4 inches outside
the building, and provide the pipe with spacers and end bushings to seal at both ends to prevent the entrance
of water and/or the escape of gas. Extend a vent line from the annular space above grade outside to a point
where gas will not be a hazard, and terminate in a rain/insect-resistant fitting.
3.5.6 Concealed Piping in Buildings
Do not use combinations of fittings ( unions, tubing fittings, running threads, right- and left-hand couplings,
bushings, and swing joints) to conceal piping within buildings.
3.5.6.1 Piping in Partitions
Locate concealed piping in hollow, rather than solid, partitions. Protect tubing passing through walls or partitions
against physical damage both during and after construction, and provide appropriate safety markings and labels..
3.5.6.2 Piping in Floors
NOTE: When acceptable to the serving gas supplier, gas piping may be embedded
in portland cement concrete floor slabs. If acceptable, delete brackets.
Lay piping in solid floors [except where embedment in concrete is indicated] in channels suitably covered to
permit access to the piping with minimum damage to the building. [Surround piping embedded in concrete by a
minimum of 40 mm 1-1/2 inches of concrete and do not allow physical contact with other metallic items such as
reinforcing rods or electrically neutral conductors. Do not embed piping in concrete slabs containing quickset
additives or cinder aggregate.]
3.5.7 Aboveground Piping
Run aboveground piping as straight as practicable along the alignment and elevation indicated, with a minimum
of joints, and separately supported from other piping system and equipment. Install exposed horizontal piping
no farther than 150 mm 6 inches from nearest parallel wall and at an elevation which prevents standing, sitting,
or placement of objects on the piping.
3.5.8 Final Gas Connections
NOTE: Only allow flexible connectors where they will not be vulnerable to physical
abuse or will not be accessible to unqualified personnel. Acceptable locations
would include locked equipment rooms, equipment suspended at least 3 meters
(10 feet) above floor, and remote buildings with limited accessibility by unqualified
personnel. If flexible connectors are allowed, include bracketed sentence prohibiting
connectors from passing through the equipment cabinet.
Unless otherwise specified, make final connections with rigid metallic pipe and fittings. [Make final connections
to kitchen ranges using flexible connectors not less than 1.02 m 40 inch long[, to afford access to coupling]
[and][ to permit movement of equipment for cleaning].][ Flexible connectors may be used for final connections
to residential dryers.] [Flexible connectors may be used for final connections to gas utilization equipment.]
[In addition to cautions listed in instructions required by ANSI standards for flexible connectors, insure that
flexible connectors do not pass through equipment cabinet.] Provide accessible gas shutoff valve and coupling
for each gas equipment item.
3.5.9 Seismic Requirements
NOTE: Provide seismic details and show on the drawings. Delete bracketed phrase
if no seismic details are provided.
Support and brace piping and attached valves to resist seismic loads in conformance with ASCE 25[ and ][as specified
in UFC 3-310-04 SEISMIC DESIGN FOR BUILDINGS, and Sections 13 48 00 SEISMIC PROTECTION FOR MISCELLANEOUS EQUIPMENT
and 13 48 00.00 10 SEISMIC PROTECTION FOR MECHANICAL EQUIPMENT][as shown on the drawings].
3.6 PIPE JOINTS
Design and install pipe joints to effectively sustain the longitudinal pull-out forces caused by contraction
of the piping or superimposed loads.
3.6.1 Threaded Metallic Joints
Provide threaded joints in metallic pipe with tapered threads evenly cut and made with UL approved graphite joint
sealing compound for gas service or tetrafluoroethylene tape applied to the male threads only. Threaded joints
up to 40 mm 1-1/2 inches in diameter may be made with approved tetrafluoroethylene tape. Threaded joints up
to 50 mm 2 inches in diameter may be made with approved joint sealing compound. After cutting and before threading,
ream pipe and remove all burrs. Caulking of threaded joints to stop or prevent leaks is not permitted.
3.6.2 Welded Metallic Joints
Conform beveling, alignment, heat treatment, and inspection of welds to NFPA 54. Remove weld defects and make
repairs to the weld, or remove the weld joints entirely and reweld. After filler metal has been removed from
its original package, protect and store so that its characteristics or welding properties are not affected adversely.
Do not use electrodes that have been wetted or have lost any of their coating.
3.6.3 Thermoplastic and Fiberglass Joints
NOTE: Thermoplastic and fiberglass pipe should not be installed where temperature
will be below minus 29 degrees C (20 degrees F) or above 38 degrees C (100 degrees
F). Fiberglass pipe may be used at temperatures up to 66 degrees C (150 degrees
F), providing the pipe is marked in accordance with ASTM D 2513.
a. Thermoplastic and Fiberglass: Conform jointing procedures to AGA XR0603. Do not make joints with
solvent cement or heat of fusion between different kinds of plastics.
b. 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, in conformance with API 570, 100 percent
of all joints and re-inspect all corrections. Arrange with the pipe manufacturer's representative in
the presence of the Contracting Officer to make first time inspection.
3.6.4 Flared Metallic Tubing Joints
Make flared joints in metallic tubing with special tools recommended by the tubing manufacturer. Use flared
joints only in systems constructed from nonferrous pipe and tubing, when experience or tests have demonstrated
that the joint is suitable for the conditions, and when adequate provisions are made in the design to prevent
separation of the joints. Do not use metallic ball sleeve compression-type tubing fittings for tubing joints.
3.6.5 Solder or Brazed Joints
Make all joints in metallic tubing and fittings with materials and procedures recommended by the tubing supplier.
Braze joints with material having a melting point above 538 degrees C 1000 degrees F, containing no phosphorous.
3.6.6 Joining Thermoplastic or Fiberglass to Metallic Piping or Tubing
When compression type mechanical joints are used, provide gasket material in the fittings compatible with the
plastic piping and with the gas in the system. Use an internal tubular rigid stiffener in conjunction with the
fitting, flush with end of the pipe or tubing, extending at least to the outside end of the compression fitting
when installed. Remove all rough or sharp edges from stiffener. Do not force fit stiffener in the plastic.
Split tubular stiffeners are not allowed.
3.6.7 Press Connections
Make press connections in accordance with manufacturer's installation instructions using tools approved by the
manufacturer. Fully insert the tubing into the fitting and then mark at the shoulder of the fitting. Check
the fitting alignment against the mark on the tubing to assure the tubing is fully inserted before the joint
is pressed.
3.7 PIPE SLEEVES
Provide pipes passing through concrete or masonry walls or concrete floors or roofs with pipe sleeves fitted
into place at the time of construction. Do not install sleeves in structural members except where indicated
or approved. Make all rectangular and square openings as detailed. Extend each sleeve through its respective
wall, floor or roof, and cut flush with each surface, except in mechanical room floors not located on grade where
clamping flanges or riser pipe clamps are used. Extend sleeves in mechanical room floors above grade at least
100 mm 4 inches above finish floor. Unless otherwise indicated, use sleeves large enough to provide a minimum
clearance of 6.4 mm 1/4 inch all around the pipe. Provide steel pipe for sleeves in bearing walls, waterproofing
membrane floors, and wet areas . Provide sleeves in nonbearing walls, floors, or ceilings of steel pipe, galvanized
sheet metal with lock-type longitudinal seam, or moisture-resistant fiber or plastic. For penetrations of fire
walls, fire partitions and floors which are not on grade, seal the annular space between the pipe and sleeve
with fire-stopping material and sealant that meet the requirement of Section 07 84 00 WIRETAPPING.
3.8 PIPES PENETRATING WATERPROOFING MEMBRANES
Install pipes penetrating waterproofing membranes as specified in Section 22 00 00 PLUMBING, GENERAL PURPOSE.
3.9 FIRE SEAL
Fire seal all penetrations of fire rated partitions, walls and floors in accordance with Section 07 84 00 FIRESTOPPING.
3.10 ESCUTCHEONS
Provide escutcheons for all finished surfaces where gas piping passes through floors, walls, or ceilings except
in boiler, utility, or equipment rooms.
3.11 SPECIAL REQUIREMENTS
Provide drips, grading of the lines, freeze protection, and branch outlet locations as shown and conforming to
the requirements of NFPA 54NFPA 58.
3.12 BUILDING STRUCTURE
Do not weaken any building structure by the installation of any gas piping. Do not cut or notch beams, joists
or columns. Attach piping supports to metal decking. Do not attach supports to the underside of concrete filled
floors or concrete roof decks unless approved by the Contracting Officer.
3.13 PIPING SYSTEM SUPPORTS
Support gas piping systems in buildings with pipe hooks, metal pipe straps, bands or hangers suitable for the
size of piping or tubing. Do not support any gas piping system by other piping. Conform spacing of supports
in gas piping and tubing installations to the requirements of NFPA 54NFPA 58. Conform the selection and application
of supports in gas piping and tubing installations to the requirements of MSS SP-69. In the support of multiple
pipe runs on a common base member, use a clip or clamp where each pipe crosses the base support member. Spacing
of the base support members is not to exceed the hanger and support spacing required for any of the individual
pipes in the multiple pipe run. Rigidly connect the clips or clamps to the common base member. Provide a clearance
of 3.2 mm 1/8 inch between the pipe and clip or clamp for all piping which may be subjected to thermal expansion.
3.14 ELECTRICAL BONDING AND GROUNDING
NOTE: Conventional flange joints allow sufficient current flow to satisfy this
requirement.
Provide a gas piping system within the building which is electrically continuous and bonded to a grounding electrode
as required by NFPA 70.
3.15 SHUTOFF VALVE
Install the main gas shutoff valve controlling the gas piping system to be easily accessible for operation, as
indicated, protected from physical damage, and marked with a metal tag to clearly identify the piping system
controlled.
[3.16 CATHODIC PROTECTION
NOTE: Use this paragraph only for those projects requiring underground, or
partially buried gas piping systems
Designs are required to have cathodic protection for underground ferrous gas
piping regardless of soil condition. Other guidance is available in TM 5-811-7.
Provide cathodic protection on additions to existing systems and stations for
testing.
Provide cathodic protection for underground ferrous gas piping as specified in [Section 26 42 14.00 10 CATHODIC
PROTECTION SYSTEM (SACRIFICIAL ANODE)] [Section 26 42 17.00 10 CATHODIC PROTECTION SYSTEM (IMPRESSED CURRENT)]
[Section 26 42 13.00 20 CATHODIC PROTECTION BY GALVANIC ANODES] [Section 26 42 19.00 20 CATHODIC PROTECTION BY
IMPRESSED CURRENT].
]3.17 TESTING
Submit test reports in booklet form tabulating test and measurements performed; dated after award of this contract,
and stating the Contractor's name and address, the project name and location, and a list of the specific requirements
which are being certified. Test entire gas piping system to ensure that it is gastight prior to putting into
service. Prior to testing, blow out the system, clean, and clear all foreign material. Test each joint with
an approved gas detector, soap and water, or an equivalent nonflammable solution. Inspect and test each valve
in conformance with API Std 598 and API Std 607. Complete testing before any work is covered, enclosed, or concealed,
and perform with due regard for the safety of employees and the public during the test. Install bulkheads, anchorage
and bracing suitably designed to resist test pressures if necessary, and as directed and or approved by the Contracting
Officer. Do not use oxygen as a testing medium.
3.17.1 Pressure Tests
Submit test reports in booklet form tabulating test and measurements performed; dated after award of this contract,
and stating the Contractor's name and address, the project name and location, and a list of the specific requirements
which are being certified. Before appliances are connected, test by filling the piping systems with air or an
inert gas to withstand a minimum pressure of 21 kPa 3 pounds gauge for a period of not less than 10 minutes as
specified in NFPA 54as specified in NFPA 58 without showing any drop in pressure. Do not use Oxygen for test.
Measure pressure with a mercury manometer, slope gauge, or an equivalent device calibrated to be read in increments
of not greater than 1 kPa 0.1 pound. Isolate the source of pressure before the pressure tests are made.
3.17.2 Pressure Tests for Liquified Petroleum Gas
Pressure test system as described above. When appliances are connected to the piping system, use fuel gas for
testing appliances to withstand a pressure of not less than 2.5 kPa nor more than 3.5 kPa 10.0 inches nor more
than 14.0 inches water column ( 0.36 nor more than 0.51 pounds per square inch) for a period of not less than
10 minutes without showing any drop in pressure. Measure pressure with a water manometer or an equivalent device
calibrated to be read in increments of not greater than 20 Pa 0.1 inch water column. Isolate the source of pressure
before the pressure tests are made.
3.17.3 Test With Gas
Before turning on gas under pressure into any piping, close all openings from which gas can escape. Immediately
after turning on the gas, check the piping system for leakage by using a laboratory-certified gas meter, an appliance
orifice, a manometer, or equivalent device. Conform all testing to the requirements of NFPA 54NFPA 58. If leakage
is recorded, shut off the gas supply, repair the leak , and repeat the tests until all leaks have been stopped.
3.17.4 Purging
After testing is completed, and before connecting any appliances, fully purge all gas piping. LPG piping tested
using fuel gas with appliances connected does not require purging. Conform testing procedures to API RP 1110
. Do not purge piping into the combustion chamber of an appliance. Do not purge the open end of piping systems
into confined spaces or areas where there are ignition sources unless the safety precautions recommended in NFPA 54
NFPA 58 are followed.
3.17.5 Labor, Materials and Equipment
Furnish all labor, materials and equipment necessary for conducting the testing and purging.
3.18 PIPE COLOR CODE MARKING
NOTE: Coordinate color code marking with Section 09 90 00. Add color code
marking for piping not listed in Table I of Section 09 90 00 to the table.
Provide color code marking of piping as specified in Section 09 90 00 PAINTS AND COATINGS, conforming to ASME A13.1
.