line pressure.
2.14.10
Welded Blowdown Tank
Provide in accordance with the Recommended Rules for the Design and
Arrangement of Boiler Blowoff Equipment supplemental to the National Board
Inspection Code latest edition published by the National Board of Boiler
and Pressure Vessel Inspectors, Columbus, Ohio.
a.
Construction: Construct equipment and accessories in accordance
with the requirements of the ASME BPVC SEC VIII for a working
pressure of at least the maximum allowable working pressure of the
boiler but in no case shall the plate thickness be less than 10 mm
3/8 inch. Provide corrosion allowance of [2.55 mm] [0.1 inch]
[_____]. Tank dimensions shall be [_____] meters feet [_____] mm
inches O.D. by [_____] meters feet [_____] mm inches long over the
heads (overall). Provide tank with wear plate not less than 10 mm
3/8 inch thick and [279 by 381 mm11 by 15 inch] [457 by 508 mm18
by 20 inch] manhole.
**************************************************************************
NOTE: The volume of the blowdown tank shall be
calculated to be twice the volume of water removed
from one boiler when the normal water level is
reduced not less than 100 mm 4 inches.
**************************************************************************
b.
Tank connections:
Provide the following connections:
(1)
Blowdown inlet for bottom blowdown [20] [25] mm [3/4] [1] inch
(2)
Tangential blowdown inlet [_____] mm inch
(3)
Steam vent, flanged [_____] mm inch
(4) Discharge water outlet, flanged [_____] mm inch with internal
water seal and 20 mm 3/4 inch siphon breaker
(5)
Drain 50 mm 2 inch
(6)
Thermometer connection 20 mm 3/4 inch
(7)
Pressure gage connection 6 mm 1/4 inch
(8) Cold water inlet [_____] mm inch with temperature regulating
valve and backflow preventer
(9)
Two gage glass connections 15 mm 1/2 inch
c.
Angle supports and coating: Provide the tank with steel angle
support legs extending [_____] meter feet below the bottom of the
tank. Coat the tank with one coat of manufacturer's standard high
temperature primer.
2.14.10.1
Accessories
a.
Gage glass:
300 mm 12 inch reflex type with shutoff valves and
guard.
SECTION 15502N
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