steel, Class 150, ASME B16.34. Valves shall have wedge disc,
outside screw and yoke (OS&Y), rising stem; valves 200 mm 8 inches
and larger shall have globe valved bypass.
(b) Globe Valves and Angle Valves: Flanged, cast iron, Class
250, MSS SP-85 or steel, Class 150, ASME B16.34.
(c) Check Valves: Flanged, cast iron, Class 250 or steel, Class
150, Type [_____], [lift] [swing] check, style [_____], ASME B16.34.
b.
Valves for maximum working pressure of 1724 kPa (gage) 250 psig
steam at a maximum temperature of 232 degrees C 450 degrees F or
3447 kPa (gage) 500 psig W.O.G. at 93 degrees C 200 degrees F
(non-shock).
(1)
Valve sizes 65 mm 2 1/2 inches and larger.
(a) Gate Valves: Flanged or butt welded, cast iron, Class 250,
MSS SP-70 (Maximum size 300 mm 12 inches) or steel, Class 300,
ASME B16.34. Valves shall have wedge disc, OS&Y, rising stem;
each valve 200 mm 8 inches and larger shall have globe valved
bypass.
(b) Gate Valves, Globe Valves and Angle Valves: Flanged or butt
welded, cast iron, Class 250, MSS SP-85 or steel, Class 300, ASME
B16.34.
(c) Check Valves: Flanged or butt welded, iron body, Class 250
or steel, Class 300, Type [_____] [lift] [swing] check, style
[_____], ASME B16.34.
c.
Valves for maximum working pressure of 2068 kPa (gage) 300 psig
steam at a maximum temperature of 454 degrees C 850 degrees F or a
maximum W.O.G. pressure of 4653 kPa (gage) at 149 degrees C 675
psig at 300 degrees F (non shock).
(1)
Valve sizes 65 mm 2 1/2 inches and larger:
(a) Gate Valves, Globe Valves, and Angle Valves: Flanged or butt
welded, ASME B16.34, steel, Class 300, rising stem, OS&Y. Gate
valves 200 mm 8 inches and larger shall have globe valved bypass.
(b) Check Valves: Flanged or butt welded, steel, Class 300, Type
[_____], [lift] [swing] check, style [_____], ASME B16.34.
d.
Ball Valves: ASME B16.5 and API Std 607 double stem seal type for
bubble tight shutoff. Seats and seals shall be TFE material.
Ball and shaft shall be stainless steel. Provide mechanical stops
to prevent cycling valve in wrong direction and self-aligning stem
seal.
e.
Valve Accessories: Valve operating mechanisms include chain
wheels, gear operators, floor stands, electric motors, air motors
and cylinder-type actuating devices. Provide accessories as
follows and as indicated.
(1) Power Operators: [Electric] [Pneumatic]. Power operated
valves shall open and close at rates no slower than 254 mm 10
inches per minute for gate valves and 100 mm 4 inches per minute
SECTION 15501N
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