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,
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 ANSI 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
1 1/2 inches in diameter with legends in depressed black-filled characters.
SECTION 15195N
Page 13