2.7.2.1
Design Conditions
a.
Number of pumps
[_____]
b.
Rated capacity of each pump,liters gpm 1/hr
[_____]
c.
Total dynamic head at rated capacity, m Feet
[_____]
d.
[_____]
e.
Maximum allowable shutoff head, m Feet
[_____]
f.
Minimum allowable shutoff head, m Feet
[_____]
g.
Type of fluid pumped
Boiler Feedwater
h.
Max. expected temp. of fluid [_____] degrees C degrees F
i.
Maximum speed of pump, rpm
3600
2.7.2.2
Pump shall have [_____] Class [_____] suction flange and [_____]Class [_____]
discharge flange. Shaft, impeller, and internals including sleeves and
wearing rings shall be stainless steel containing not less than 11 percent
chromium. [Horizontal pump impellers shall be closed type, cast in one
piece.] Casing shall be 11 to 13 percent chromium steel. [Suction and
discharge chamber shall be cast iron.] [Horizontal pump shall be designed to
pump water at any temperature from 10 to [_____] degrees C 50 to [_____]
degrees F without undue temperature strains within pump. Rotating parts
shall be properly balanced. Assembled rotor shall be dynamically balanced.
Casing volutes shall be staggered to ensure radial balance of the assembled
rotor under operating conditions. On volute pumps, impeller shall be mounted
on the shaft half facing in one direction and the other half facing in the
opposite direction to give axial balance to the motor.]
2.7.2.3
Cooling Water Piping
Pump shall be furnished with complete cooling water system which connects
jacket cooler to common header. Piping shall be factory assembled as
completely as possible on the pump. Seal flush piping shall be Type 316
stainless steel. Seal flush cooler tubing shall be Type 304 stainless
steel. Flow regulating valve and 6.35 mm 1/4 inch bypass needle-valve
shall be provided on each supply branch.
2.7.2.4
Bearings
[Horizontal pump shall include a double row ball type thrust bearing on the
outboard end and a single row deep groove radial bearing on the inboard
end. Splash type bearing lubrication shall be provided.]
[Vertical type pump bearings shall be water lubricated sleeve type
constructed of babbitted graph alloy with Type 304 stainless steel shaft
sleeves.] The bearings shall be designed for L-10 bearing life of [_____].
2.7.2.5
Shaft Sealing System
[Vertical pump shall be equipped with an effective mechanical shaft seal to
SECTION 15561A
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