connections. Equip valve operators with a spring yield device so that when
in the closed position it will maintain on the valve disc a pressure
equivalent to the pressure rating of the valve.
2.3.8
Air Vents and Relief Valves
2.3.8.1
Air Vents
FS A-A-60001, float construction for pressures up to 862 kPa 125 psi.
2.3.8.2
ASME labeled valves with a relief setting 200 percent higher than the
normal operating pressure. Provide nonferrous or stainless steel valve
seats and moving parts exposed to fluid, compatible with the operating
conditions.
2.4
PIPING SPECIALTIES
2.4.1
Bolts and Nuts
Stainless steel; ASTM A 193/A 193M for bolts and ASTM A 194/A 194Mfor nuts.
2.4.2
Gaskets
**************************************************************************
NOTE: For cold weather region of below minus 10
degrees C 14 degrees F, consider gaskets made of
rubber in accordance with ASTM D 3667, Type C.
**************************************************************************
[Fluorinated elastomers, ethylene-propylene-diene-terpolymer (EPDM) or
silicone] [ASTM D 3667, Type C rubber], compatible with flange faces.
2.4.3
Brazing Metal
AWS A5.8, 15 percent silver-base alloy, minimum melting point 816 degrees C
1,500 degrees F, for copper pipes rated at maximum 862 kPa and 177 degrees C
125 psi and 350 degrees F. Provide cadmium free filler metals.
2.4.4
Solder Metal
ASTM B 32, Alloy Grade Sb5, Sn95, or Sn96, with minimum melting 221 degrees
C 430 degrees F.
2.4.5
Strainers
FS WW-S-2739, Class 125; Style Y pattern; Type I, threaded or soldered
ends, for 50 mm 2 inches and smaller; and Type II, flanged ends, for 65 mm
2 1/2 inches and larger.
2.4.6
Piping Identification Labels
Plastic slip-on or adhesive backed labels conforming to MIL-STD-101.
2.4.7
Hangers and Supports
MSS SP-58, as required by MSS SP-69.
SECTION 13610N
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