(2) Piston Operated Valves: Control valve by integral pilot
valve through external feeder piping.
g.
Safety Relief Valves: ASME BPVC SEC I, with Class [150] [300]
inlet flange, with test lever, designed for the intended service.
2.15.3.5
Bolts and Nuts
a.
Bolts: ASTM A 193/A 193M, Grade B8. Lengths of bolts shall be
such that not less than two full threads will extend beyond nut
with bolts tightened to the required tensions and washers seated.
b.
Nuts:
ASTM A 194/A 194M, Grade 8.
2.15.3.6
Gaskets
ASME B31.1 and as specified below, except provide spiral wound metal
covered asbestos gaskets in lieu of compressed sheet asbestos. Gaskets
shall be as thin as the finish of surfaces will permit. Do not use paper,
vegetable fiber, rubber, or rubber inserted gaskets for temperatures
greater than 121 degrees C 250 degrees F. Provide metal or metal jacketed
asbestos gaskets with small male and female and small tongue-and-groove
flanges and flanged fittings; they may be used with steel flanges with
lapped, large male and female, large tongue-and-groove, and raised facings.
Provide fullface gaskets with flat-faced flanges. Raised face cast iron
flanges, lapped steel flanges, and raised faced steel flanges shall have
ring gaskets with an outside diameter extending to inside of bolt holes.
Widths of gaskets for small male and female and for tongue-and-groove
joints shall be equal to widths of male face and tongue. Gaskets shall
have an inside diameter equal to or larger than port opening. Dimensions
for nonmetallic gaskets shall be in accordance with ASME B16.21. Materials
for flanged gaskets shall be as listed below for service specified:
a.
Steam, Boiler Blowdown, Exhaust Steam:
Spiral wound metal
composition or copper
b.
Boiler Feed Water:
Metal jacketed asbestos, copper or monel
c.
Hot Water, (above 38 degrees C 100 degrees F):
Spiral wound metal
asbestos
d.
Cold Water:
Red rubber or neoprene rubber
e.
Heavy Fuel Oil (No. 6):
Spiral wound metal asbestos, soft steel,
or monel
f.
Diesel Fuel (No. 2):
ASME B16.21 metallic
g.
Compressed Air:
Spiral wound metal asbestos
2.15.3.7
Expansion Joints
a.
Slip Tube Expansion Joints: ASTM F 1007, single or double slip
tube as indicated, designed for [1034] [2068] kPa (gage) [150]
[300] psig saturated steam working pressure. Expansion joints
shall be of the type which permits injection of semi plastic type
packing while joint is in service under full line pressure. Slip
tube shall be of chromium plated, wrought steel construction,
guided by internal and external guides integral with joint body.
SECTION 15501N
Page 143
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