a.
Pipe: Black steel in accordance with ASTM A 53, 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.]]
SECTION 15195N
Page 10