kg/sec pounds per hour of steam at [_____] kPa (gage) psig.
2.14.3
Boiler Feed Pumps
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NOTE: Use this paragraph for centrifugal boiler
feed pumps. Use Style 1, horizontal split case
pumps in all sizes. Pump service requirements shall
include pump capacity of a minimum of 125 percent of
boiler requirements at maximum load. Discharge head
must be sufficient to deliver water to the boiler at
a pressure 3 percent higher than the setting of the
highest setting of the boiler safety valves and up
to 6 percent over the maximum operating pressure of
the boiler in accordance with ASME BPVC SEC.
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FS A-A-50562, Type II (boiler feed pump), Style 1 (horizontally split
case), Class 2 (multi-stage) except as modified below. Each pump shall be
two stage with horizontal split casing, enclosed single suction opposed
type impellers, renewable casing and impeller wearing rings, stuffing box
with quenching gland and flooded oil lubricated, water cooled bearings.
2.14.3.1
Construction
Bronze fitted including bronze impeller and impeller wear rings, and ASTM A
48M ASTM A 48, Class 30, cast iron casing. Provide casing with suction and
discharge gages in tapped openings. Mount each pump and prime mover on a
fabricated steel bed plate having a drip collection chamber with tapped
drain openings. Provide lifting attachments to enable equipment to be set
into its normal position and to enable split case pumps to be easily
dismantled in place.
2.14.3.2
Drives
Variable speed motors and turbines direct connected to respective pumps
with a gear type, forged steel, flexible coupling. Provide a shaft and
coupling guard.
a.
Electric motors: Variable speed, [open drip proof], [totally
enclosed], [fan cooled], [_____] volt, three phase, 60 Hz of not
less than [_____] kW hp, as specified under paragraphs entitled
"Motors and Drives" and "Variable Speed Control For Motors" in
this section.
b.
Steam turbine: Single stage, rated at not less than [_____] kW hp,
with inlet steam pressure of [_____] kPa (gage) psig and [_____]
degrees C F and normal exhaust back pressure of 34 kPa (gage) 5
psig or a maximum back pressure of 103 kPa (gage) 15 psig. Water
rate at full load and normal steam conditions shall not exceed
[_____] kg pounds per brake power hour. Provide a stainless steel
steam strainer, sentinel relief valve, sight oil level indicator
and one hand valve.
(1) Turbine construction: Turbine casing split on the horizontal
centerline constructed of ASTM A 48M ASTM A 48, cast iron, with a
design pressure rating of 1724 kPa (gage) at 232 degrees C 250
psig at 450 degrees F at inlet, and 379 kPa (gage) at 232 degrees C
55 psig at 450 degrees F at the outlet.
SECTION 15502N
Page 150
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