to automatically stop. Power operators shall be complete with all
gearing and controls necessary for the size of valve being
provided. Power operators shall be designed to operate on the
[electric] [compressed air] power supply indicated.
d.
Extension Stem: Corrosion resisting steel designed for rising and
non-rising stems. 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.
2.1.7.14
Balancing Valves
Balancing valves shall be calibrated bronze body balancing valves with
integral ball valve and venturi or valve orifice and valve body pressure
taps for flow measurement based on differential pressure readings. Valve
pressure taps and meter connections shall have seals and built-in check
valves with threaded connections for a portable meter. Meter shall be
provided by the same manufacturer and be capable of reading system
pressures and shall meet the requirements of the paragraph entitled "Flow
Measuring Equipment." Valves shall have internal seals to prevent leakage
around rotating element and be suitable for full shut-off rated pressure.
Valves shall have an operator with integral pointer and memory stop.
Balancing valves shall be selected for the required flows as indicated on
the plans.
2.1.8
End Connections
2.1.8.1
Flexible Connectors
Provide flexible pipe connectors on piping connected to equipment.
Flexible section shall consist of rubber, tetrafluoroethylene resin,
corrosion-resistant steel, bronze, monel, or galvanized steel. Material
provided and configuration shall be suitable for [pressure,] [vacuum,]
[temperature,] and circulating medium. Flexible section shall have
[threaded,] [welding,] [soldering,] [flanged] [or] [socket-weld] ends and
shall be suitable for service intended. Flexible section may be reinforced
with metal retaining rings, with built-in braided wire reinforcement and
restriction bolts or with wire braid cover suitable for service intended.
2.1.8.2
Steel Piping
Screwed or socket welded for 50 mm 2 inches and smaller and flanged or butt
welded for 65 mm 2 1/2 inches and larger.
a.
Screwed Joints With Taper Threads:
ASME B1.20.1.
b.
Bolting and gaskets shall be as follows:
(1) Bolting: Bolt and stud material ASTM A 307, Grade B, and nut
material ASTM A 194/A 194M, Grade 2. Bolt, stud, and nut
dimensions ASME B18.2.2 threads 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 ASME B18.2.2.
(2)
Gaskets:
ASME B16.21, Nonasbestos compressed material 1 1/2
SECTION 15185N
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