b.
Outlet Water Valve: [_____] mm inch air operated control valve
with a capacity to pass [_____] L/s gpm at a pressure drop of
[_____] kPa (gage) psig. Cv shall not be less than [_____] at 100
percent open. Valve shall be Class [_____], flanged, iron or
semi-steel body with stainless steel internals. Valve shall have
equal percentage flow characteristics with a full size port.
Provide an air lock mounted on valve diaphragm and piped to hold
valve in last position on air failure.
2.9.11.8
Sample Cooler
Water cooled shell and tube type with valves and accessories required to
safely withdraw a water sample from the boiler drum. Provide drain under
sampling valve terminating with a 20 mm 3/4 inch splash proof funnel, 230 mm
9 inches below outlet of valve.
2.9.11.9
Heat Exchanger
Provide an ASME code stamped continuous blowoff heat exchanger designed and
constructed in accordance with ASME BPVC SEC VIII D1 to transfer heat from
the continuous blowoff water leaving the continuous blowoff flash tank to
the treated makeup water entering the feedwater heater. Heat exchanger
shall be a bare tube, helical coiled bundle, installed in a one piece
casing with removable front plate. Bundle shall be removable. Tube
diameter shall be not less than 20 mm 3/4 inch. Tubes shall be ASTM B
111/B 111M copper alloy with cast iron shell. Design tube side for not
less than [_____] kPa (gage) psig pressure at [_____] degrees C F. Design
shell side for not less than [_____] kPa (gage) psig pressure at [_____]
degrees C F.
2.10
PIPING
Piping work shall include the provision of piping systems, including
valving and specialty items, for the steam plant and related external
auxiliary equipment. Piping materials, design, and fabrication shall be in
accordance with ASME B31.1 except as modified below or indicated otherwise.
The requirements of ASME B31.1 apply to the building steam heating and
steam distribution piping designed for 103 kPa (gage) 15 psig or lower and
hot water heating systems 207 kpa (gage) 30 psig or lower. Provide piping
materials suitable for the maximum pressure at the maximum temperature at
which the equipment must operate. Compute expansion of pipe with operating
temperatures above minus 18 degrees C zero degrees F with minus 18 degrees C
zero degrees F in lieu of 21 degrees C 70 degrees F specified in ASME B31.1.
2.10.1
Piping Materials
a.
Steam Pipe, Boiler Feedwater Pipe, Relief Pipe and Steam Tracer:
Pipe Black, ASTM A 53 or ASTM A 106 seamless steel pipe, Grade A
or B. Wall thickness not less than Schedule 40. Steam tracer
pipe, with steam up to 103 kPa (gage) 15 psig, may be ASTM B 88M
ASTM B 88, Type K copper tubing.
b.
Condensate Pipe and Boiler Blowdown Pipe: Black, welded or
seamless ASTM A 53 or ASTM A 106, steel pipe, Grade A or B.
Wall
thickness not less than extra strong (XS or Schedule 80).
c.
Chemical Feed Pipe:
ASTM A 312/A 312M austenitic stainless steel.
SECTION 15511N
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