HomeMy WebLinkAbout231123 NATURAL GAS SYSTEMS.pdfL’ACQUIS MASTER (01/10) 23 11 23�1
SECTION 23 11 23 � NATURAL GAS SYSTEMS
PART 1 � GENERAL
1.01 RELATED SECTIONS:
A. Drawings, general provisions of the Contract, including General and Supplementary
Conditions, and Division�1 Specification Sections and Division 20 Specification Sections,
apply to work of this Section.
1.02 SUMMARY
A. This Section includes distribution piping systems for natural gas and manufactured gas
within the building and extending from the point of delivery to the connections with gas
utilization devices. Piping materials and equipment specified in this section include:
1. Pipes, fittings, and specialties.
2. Special duty valves.
B. Products installed but not furnished under this Section include gas meters which will be
provided by the utility company, to the site, ready for installation.
C. Related Sections: The following Sections contain requirements that relate to this Section:
1. Division 07 Section "Joint Sealers" for materials and methods for sealing pipe
penetrations through basement walls and fire/smoke barriers.
2. Section 20 01 90 "Mechanical Identification" for labeling and identification of gas
piping systems.
1.03 DEFINITIONS
A. Pipe sizes used in this Specification are Nominal Pipe Size (NPS).
B. Gas Distribution Piping: A pipe within the building which conveys gas from the point of
delivery to the points of usage.
C. Gas Service Piping: The pipe from the gas main or other source of supply including the
meter and regulating valve.
D. Point of Delivery is the outlet of the service meter assembly.
1.04 SUBMITTALS
A. Product data for each gas piping specialty and special duty valve. Include rated
capacities of selected models, furnished specialties and accessories, and installation
instructions.
B. Shop drawings detailing dimensions, required clearances, for connection to gas meter.
C. Coordination drawings for gas distribution piping systems in accordance with Section 20
00 10 "Basic Mechanical Requirements."
D. Welders' qualification certificates, certifying that welders comply meet the quality
requirements specified under "Quality Assurance" below.
1.05 QUALITY ASSURANCE
A. Installer Qualifications: Installation and replacement of gas piping, gas utilization
equipment or accessories, and repair and servicing of equipment shall be performed only
by a qualified installer. The term qualified is defined as experienced in such work
(experienced shall mean having a minimum of 5 previous projects similar in size and
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scope to this project), familiar with precautions required, and has complied with the
requirements of the authority having jurisdiction. Upon request, submit evidence of such
qualifications to the Engineer.
B. Qualifications for Welding Processes and Operators: Comply with the requirements of
ASME Boiler and Pressure Vessel Code, "Welding and Brazing Qualification."
C. Regulatory Requirements: Comply with the requirements of the following codes:
1. Fabricate and install natural gas systems in accordance with local gas utility
company requirements.
2. International Fuel Gas Code.
3. International Mechanical Code.
4. State Plumbing Code.
D. Polyethylene piping and tubing requirements:
1. All polyethylene piping, tubing, and fittings shall conform to all applicable
provisions and requirements of the latest revision of the U. S. Department of
Transportation Pipeline Safety Regulations (CFR) Title 49, Part 192, “Federal
Minimum Safety Standards: Transportation of Natural and Other Gases by
Pipeline” and, by inclusion, all appropriate standards referenced therein.
1.06 DELIVERY, STORAGE, AND HANDLING
A. Handling Flammable Liquids: Remove and legally dispose of liquid from all drips in
existing gas piping and handled cautiously to avoid spillage or ignition. Notify the gas
supplier. Handle flammable liquids used by the installer with proper precautions, and do
not leave on the premises from the end of one working day to the beginning of the next.
1.07 SEQUENCING AND SCHEDULING
A. Notification of Interruption of Service: Except in the case of an emergency, notify all
affected users when the gas supply is to be turned off.
B. Work Interruptions: When interruptions in work occur while repairs or alterations are
being made to an existing piping system, leave the system in safe condition.
C. Coordinate the installation of pipe sleeves for foundation wall penetrations.
PART 2 � PRODUCTS
2.01 GENERAL:
A. General: Provide piping materials and factory�fabricated piping products of sizes, types,
pressure ratings, and capacities as indicated. Where not indicated, provide proper
selection to comply with installation requirements.
B. Provide materials and products complying with the International Fuel Gas Code where
applicable, base pressure rating on natural gas piping system maximum design
pressures.
C. Provide sizes and types matching piping and equipment connections: provide fittings of
materials which match pipe materials used in natural gas systems. Where more than one
type of materials or products is indicated, selection is Installer's option.
2.02 BASIC IDENTIFICATION
A. General: Provide identification complying with Section 20 01 90 "Mechanical
Identification," in accordance with the following listing:
1. Building Distribution Piping: Plastic pipe markers or stenciled markers
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2. Gas Valves: Brass valve tags
2.03 PAINTING FOR SYSTEM IDENTIFICATION AND PROTECTION
A. Uninsulated piping: Prepare surface by cleaning with a solvent and steel wool to remove
rust, grease, oil, dirt and pipe joining compound. Once surface is clean and dry, apply
one coat of Alkyd based rust inhibited primer. 2.0 mil thick minimum. After primer is dry,
apply two coats of Alkyd based gloss enamel (1.5 mil thickness each coat).
2.04 MANUFACTURERS:
A. Manufacturer: Subject to compliance with requirements, provide gas piping system
products from one of the following:
1. Gas Cocks:
a. Resun
b. DeZurich
c. Homestead
2.05 PIPE AND TUBING MATERIALS:
A. General: Refer to Part 3, Article "PIPE APPLICATION" for identification of systems where
the below specified pipe and fitting materials are used. Provide pipes and pipe fittings in
accordance with the following listing:
B. Building Distribution Piping:
1. ASTM A 53/A 53M, black steel, Schedule 40, Type E or S, Grade B.
2. Pipe sizes 2” and smaller: Black steel pipe: Schedule 40; malleable iron threaded
fittings.
3. Pipe sizes 2�1/2” and larger: Black steel pipe, Schedule 40, wrought�steel
buttwelded fittings.
2.06 FITTINGS:
A. Malleable�Iron Threaded Fittings: ANSI B16.3, Class 150, standard pattern, for threaded
joints. Threads shall conform to ANSI B1.20.1.
B. Steel Fittings: ASTM A 234, seamless or welded, for welded joints.
C. Steel Flanges and Flanged Fittings: ANSI B16.5, including bolts, nuts, and gaskets of the
following material group, end connection and facing:
1. Material Group: 1.1.
2. End Connections: Butt Welding.
3. Facings: Raised face.
2.07 JOINING MATERIALS:
A. Joint Compound: Suitable for the gas being handled.
B. Gasket Material: Thickness, material, and type suitable for gas to be handled, and for
design temperatures and pressures.
2.08 PIPING SPECIALTIES:
A. Unions: ANSI B16.39, Class 150 black malleable iron; female pattern; brass to iron seat;
ground joint.
B. Dielectric Unions: ANSI B16.39, Class 250; malleable iron and cast bronze; with threaded
or soldered end connections suitable for pipe to be joined; designed to isolate galvanic
and stray current corrosion.
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C. Protective Coating: When piping will be in contact with material or atmosphere exerting a
corrosive action, pipe and fittings shall be factory�coated with polyethylene tape, having
the following properties:
1. Overall thickness; 20 mils.
2. Synthetic adhesive.
3. Water vapor transmission rate, 0.10 or less gallons per 100 square inch.
4. Water absorption, percent: 0.02 or less.
5. Prime pipe and fittings with a compatible primer prior to application of tape.
2.09 VALVES:
A. General duty valves (i.e., gate, globe, check, ball, and butterfly valves) are specified in
Section 20 01 00 " Valves." Special duty valves are specified in this Article by their
generic name. Refer to Part 3 below, Article "VALVE APPLICATION" for specific uses
and applications for each valve specified.
B. Gas Cocks 2 Inch and Smaller: 150 psi WOG, bronze body, straight�away pattern,
square head, threaded ends.
C. Gas Cocks 2�1/2 Inch and Larger: MSS SP�78; 175 psi, lubricated plug type, semi�steel
body, single gland, wrench operated, flanged ends.
2.10 GAS CONTROL VALVES:
A. Master Gas Control Valves: Aluminum body, packless, single Buna “N" seat. explosion�
proof construction for low pressure gas, solenoid operated two�way, normally closed. UL�
approved, automatic reset, maximum pressure shall be 25 psi for pipe sizes 1�1/2" to 1�
1/4" and 15 psi for 1�1/2" to 2" pipe. Control voltage shall be 80�90 volts DC: ASCO
Bulletin 8215.
B. Relay panel shall open and de�energize normally closed solenoid gas valves. Complete
loss of or approximately a 50% reduction of control voltage shall de�energize and lock out
the gas valves.
C. Opening of the gas valves shall be by a key operated switch only. The relay shall be
three�wire control with a 120 VAC, 60 Hertz input. The output shall be solid state rectified
to 80 VDC, 0.8 amperes. All components shall be mounted in a NEMA 1, flush mounted
enclosure. The relay panel shall be ASCO Bulletin 108D10C.
D. Master Control Station shall consist of at least a key operated, normally open contact for
opening, and push button operated, normally closed contact for de�energizing the gas
valve. A red indicating lamp shall energize when the gas valve is open. The 3�gang
stainless steel faceplate shall have the wording "GAS VALVE CONTROL" at the top.
"OPEN" centered over the key switch and lamp, and "SHUT" over the push button. The
master control station shall be ASCO Catalog #216B89D and control one (1) Bulletin 108
relay panel.
E. Manufacturer: Subject to compliance with requirements, provide control valves of one of
the following:
1. Automatic Switch Co.
2.11 GAS LINE PRESSURE REGULATORS:
A. Single stage, steel jacketed, corrosion�resistant gas pressure regulators; with
atmospheric vent, elevation compensator; with threaded ends for 2 inch and smaller,
flanged ends for 2�1/2 inch and larger; for inlet and outlet gas pressures, specific gravity,
and volume flow indicated.
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B. Manufacturer: Subject to compliance with requirements, provide gas�regulating valves of
one of the following:
1. Equimeter (formerly Rockwell)
2. Fisher
PART 3 � EXECUTION
3.01 PREPARATION:
A. Precautions: Before turning off the gas to the premises, or section of piping, turn off all
equipment valves. Perform a leakage test as specified in "FIELD QUALITY CONTROL"
below, to determine that all equipment is turned off in the piping section to be affected.
B. Conform to the requirements in the International Fuel Gas Code, for the prevention of
accidental ignition.
3.02 PIPE APPLICATIONS:
A. Install polyethylene pipe and tubing underground outside buildings.
B. Install steel pipe with threaded joints and fittings for 2 inch and smaller, and with welded
joints for 2�1/2 inch and larger.
3.03 PIPING INSTALLATIONS:
A. General: Conform to the requirements of the International Fuel Gas Code.
B. Locations and Arrangements: Drawings (plans, schematics, and diagrams) indicate the
general location and arrangement of piping systems. Design locations and arrangements
of piping take into consideration pipe sizing, flow direction, slope of pipe, expansion, and
other design considerations. So far as practical, install piping as indicated.
C. Concealed Locations: Except as specified below, install concealed gas piping in an
air�tight conduit constructed of Schedule 40, seamless black steel with welded joints.
Vent conduit to the outside and terminate with a screened vent cap.
1. Above�Ceiling Locations: Gas piping may be installed in accessible above�ceiling
spaces (subject to the approval of the authority having jurisdiction), whether or
not such spaces are used as a plenum. Valves shall not be located in such
spaces.
2. In Floors: Piping installed in floors shall have protective wrapping specified in
PART 2 above. Piping cast in concrete slabs shall be surrounded with a
minimum of 1�1/2 inches of concrete and shall not be in physical contact with
other metallic structures such as reinforcing rods or electrically neutral
conductors. Piping shall not be embedded in concrete slabs containing quick�set
additives or cinder aggregate.
3. Piping In Partitions: Concealed piping shall not be located in solid partitions.
Tubing shall not be run inside hollow walls or partitions unless protected against
physical damage. The does not apply to tubing passing through walls or
partitions.
4. Prohibited Locations: Do not install gas piping in or through a circulating air duct,
clothes chute, chimney or gas vent, ventilating duct, dumb waiter or elevator
shaft. This does not apply to accessible above�ceiling space specified above.
D. Install pipe sleeves and seals at foundation and basement wall penetrations.
E. Seal pipe penetrations of fire barriers using fire barrier penetration sealers specified in
Division 7 Section "Joint Sealers."
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F. Drips and Sediment Traps: Install a drip leg at points where condensate may collect, at
the outlet of the gas meter, and in a location readily accessible to permit cleaning and
emptying. Do not install drips where condensate is likely to freeze.
1. Construct drips and sediment traps using a tee fitting with the bottom outlet
plugged or capped. Use a minimum of 3 pipe diameters in length for the drip leg.
Use same size pipe for drip leg as the connected pipe.
G. Use fittings for all changes in direction and all branch connections.
H. Install exposed piping at right angles or parallel to building walls. Diagonal runs are not
permitted, unless expressly indicated.
I. Install piping free of sags or bends and with ample space between piping to permit proper
insulation applications.
J. Conceal all pipe installations in walls, pipe chases, utility spaces, above ceilings, below
grade or floors, unless indicated to be exposed to view.
K. Install piping tight to slabs, beams, joists, columns, walls, and other permanent elements
of the building. Allow sufficient space above removable ceiling panels to allow for panel
removal.
L. Locate groups of pipes parallel to each other, spaced to permit applying insulation and
servicing of valves. Maintain minimum of 12" clearance between gas piping and steam or
hydronic piping above 200 degrees F.
M. Install gas piping at a uniform grade of 1/4 inch in 15 feet, upward to risers, and from the
risers to the meter, or service regulator when meter is not provided, or the equipment.
N. Make reductions in pipe sizes using eccentric reducer fittings installed with the level side
down.
O. Connect branch outlet pipes from the top or sides of horizontal lines, not from the bottom.
P. Hanger, supports, and anchors are specified in Section 20 01 40. Conform to the table
below for maximum spacing of supports:
Steel Pipe:
SIZE (NPS) SPACING IN FEET MIN. RODSIZE�INCHES
1/2 5 3/8
3/4 to 1�1/4 6 3/8
1�1/2 to 5 12 1/2
(vertical) all sizes every floor
Q. Install unions in pipes 2 inch and smaller, adjacent to each valve, at final connections
each piece of equipment, and elsewhere as indicated. Unions are not required on flanged
devices.
R. Install dielectric unions where piping of dissimilar metals are joined.
S. Install flanges on valves, apparatus, and equipment having 2�1/2 inch and larger
connections.
T. Install strainers on the supply side of each control valve, pressure reducing valve,
pressure regulating valve, solenoid valve, and elsewhere as indicated.
U. Anchor piping to ensure proper direction of expansion and contraction. Install expansion
loops and joints as indicated on the Drawings and specified in Section 20 01 25.
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3.04 PIPE JOINT CONSTRUCTION:
A. Welded Joints: Comply with the requirements in ASME Boiler and Pressure Vessel
Code, Section IX.
B. Threaded Joints: Conform to ANSI B1.20.1, tapered pipe threads for field cut threads.
Join pipe, fittings, and valves as follows:
1. Apply appropriate tape or thread compound to the external pipe threads. Use
sealants on metal gas piping threads which are chemically resistant to natural
gas. Use sealants sparingly, and apply to only male threads of metal joints.
2. Remove cutting and threading burrs before assembling piping.
3. Do not install defective piping or fittings. Do not use pipe with threads which are
corroded or damaged. If a weld opens during cutting or threading operations, that
portion of pipe shall not be used.
4. Plug each gas outlet, including valves, with threaded plug or cap with threaded
plug or cap immediately after installation and retain until continuing piping. or
equipment connection are completed.
5. Note the internal length of threads in fittings or valve ends, and proximity of
internal seat or wall, to determine how far pipe should be threaded into joint.
Refer to the International Fuel Gas Code, for guide for number and length of
threads for field threading steel pipe.
6. Align threads at point of assembly. Assemble joint to appropriate thread depth.
When using a wrench on valves place the wrench on the valve end into which the
pipe is being threaded.
C. Flanged Joints: Align flanges surfaces parallel. Assemble joints by sequencing bolt
tightening to make initial contact of flanges and gaskets as flat and parallel as possible.
Use suitable lubricants on bolt threads. Tighten bolts gradually and uniformly to
appropriate torque specified by the bolt manufacturer.
3.05 VALVE APPLICATIONS:
A. General: The Drawings indicate valve types, locations, and arrangements.
B. Shut�off duty: Use gas cocks specified in Part 2 above.
3.06 VALVE INSTALLATIONS:
A. Install valves in accessible locations, protected from physical damage. Tag valves with a
metal tag attached with a metal chain indicating the piping systems supplied.
B. Install a gas cock upstream of each gas pressure regulator. Where two gas pressure
regulators are installed in series in a single gas line, a manual valve is not required at the
second regulator.
C. Install pressure relief or pressure limiting devices so they can be readily operated to
determine of the valve is free; so they can be tested to determine the pressure at which
they will operate; and examined for leakage when in the closed position.
3.07 INSTALLATION OF PIPING SPECIALTIES:
A. Install piping specialties in accordance with Section 20 01 20 “Piping Specialties”.
3.08 INSTALLATION OF SUPPORTS AND ANCHORS:
A. Install supports and anchors in accordance with Section 20 01 40 "Supports and
Anchors."
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3.09 TERMINAL EQUIPMENT CONNECTIONS:
A. Install gas cock upstream and within 6 feet of gas appliance. Install a union or flanged
connection downstream from the gas cock to permit removal of controls.
B. Sediment Traps: Install a tee fitting with the bottom outlet plugged or capped as close to
the inlet of the gas appliance as practical. Drip leg shall be a minimum of 3 pipe
diameters in length.
3.10 ELECTRICAL BONDING AND GROUNDING:
A. Install above ground portions of gas piping systems, upstream from equipment shutoff
valves electrically continuous and bonded to a grounding electrode in accordance with
NFPA 70 � "National Electrical Code."
B. Do not used gas piping as a grounding electrode.
C. Conform to NFPA 70 � "National Electrical Code," for electrical connections between
wiring and electrically operated control devices.
3.11 FIELD QUALITY CONTROL:
A. Piping Tests: Inspect, test, and purge natural gas systems in accordance with
requirements of the International Fuel Gas Code, and local utility requirements.
3.12 EXTRA MATERIALS:
A. Valve Wrenches: Furnish to Owner, with receipt, 2 valve wrenches for each type of gas
valve installed, requiring same.
END OF SECTION