d.
Extension Stem: Shall be corrosion resisting steel designed for
rising and non-rising stems, as applicable, and for connection to
the valve stem by a sleeve coupling or universal joint. Provide
in length required to connect the valve stem and the [handwheel]
[operating mechanism] and of sufficient cross section to transfer
the torque required to operate the valve.
2.2.7.9
Safety Valves
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NOTE: The designer shall ensure that safety valves
are installed for proper personnel protection. Vent
piping shall be sized to minimize back pressure.
The pipe sizes and the method of termination shall
be shown on the drawings.
**************************************************************************
**************************************************************************
NOTE: Consult reference document to determine Type,
Class, and Style as appropriate for the project.
**************************************************************************
MIL-V-18634, Type 1, Class [____], Style [_____], and sized in accordance
with ASME BPVC SEC. Set point shall be as indicated, cast iron prohibited.
2.2.8
End Connections
2.2.8.1
Steel Piping
Sizes 50 mm 2 inches and smaller threaded or socket welded; sizes 65 mm 2
1/2 inches and larger flanged or butt welded.
a.
Threaded Joints:
ASME B1.20.1.
b.
Flanged Joints: Flanges shall conform to paragraph entitled
"Flanges." Bolting and gaskets shall be as follows:
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NOTE: For temperature limitations on the use of
these bolts, consult ASME B31.1.
**************************************************************************
(1) Bolting: Material used for bolts and studs shall conform to
ASTM A 307, Grade B; and material for nuts shall conform to ASTM A
194/A 194M, Grade 2. Dimensions of bolts, studs, and nuts shall
conform to ANSI B18.2.1 and ASME B18.2.2 with threads conforming
to ASME B1.1coarse type, with Class 2A fit for bolts and studs,
and Class 2B fit for nuts. Bolts or bolt-studs shall extend
completely through the nuts and may have reduced shanks of a
diameter not less than the diameter at root of threads. Carbon
steel bolts shall have American Standard regular square or heavy
hexagon heads and shall have American Standard heavy semifinished
hexagonal nuts, conforming to ANSI B18.2.1 and ASME B18.2.2.
(2)
Gaskets:
Gaskets shall be as follows:
Working Conditions
Material
Saturation
SECTION 15183N
Page 18
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