2.1.9
Sealants for Steel Pipe Threaded Joints
2.1.9.1
Sealing Compound
Joint sealing compound shall be as listed in UL Gas&Oil Dir, Class 20 or
less.
2.1.9.2
Tape
Polytetrafluoroethylene tape shall conform to ASTM D 3308.
2.1.10
Identification
Pipe flow markings and metal tags for each valve, meter, and regulator
shall be provided as required by the Contracting Officer.
2.1.11
Insulating Joint Materials
Insulating joint materials shall be provided between flanged or threaded
metallic pipe systems where shown to isolate galvanic or electrolytic
action.
2.1.11.1
Threaded Joints
Joints for threaded pipe shall be steel body nut type, dielectric waterways
with insulating gaskets.
2.1.11.2
Joints for flanged pipe shall consist of full face sandwich-type flange
insulating gasket of the dielectric type, insulating sleeves for flange
bolts and insulating washers for flange nuts.
2.1.11.3
Dielectric Waterways and Flanges
Dielectric waterways shall have temperature and pressure rating equal to or
greater than that specified for the connecting piping. Waterways shall
have metal connections on both ends suited to match connecting piping.
Dielectric waterways shall be internally lined with an insulator
specifically designed to prevent current flow between dissimilar metals.
Dielectric flanges shall meet the performance requirements described herein
for dielectric waterways.
2.1.12
Gas Transition Fittings
Gas transition fittings shall be manufactured steel fittings approved for
jointing steel and polyethylene or fiberglass pipe. Approved transition
fittings are those that conform to AGA XR0104 requirements for transition
fittings.
2.2
VALVES
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NOTE: Valves and pressure regulators are necessary
at all points where design requires pressure
reduction or regulation. Require a shut-off valve
upstream of the regulator. A central regulating
station is generally provided by the gas company and
is usually located near the entrance to the
SECTION 02556A
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