2.14.3.4
Feedwater Stop and Check Valves
Provide a Class 300, flanged, cast steel feedwater stop gate valve and
check valve on the feedwater outlet of each pump.
Provide piping from the
valves to the economizer inlet, and from the economizer to the flanged
connection on the boiler drum. Provide connection on pipe at economizer
outlet for remote recording thermometer.
2.14.4
Condensate Pumps
**************************************************************************
NOTE: Use this paragraph for centrifugal condensate
pumps. Pump service requirements shall include pump
capacity at a minimum of 125 percent of full load
boiler requirements. Discharge into deaerator
heater shall be modulated.
**************************************************************************
FS A-A-50562, Type I, Style [1 (horizontally split cast)] [2 (end
suction)], Class 1 (single stage) unless modified below.
2.14.4.1
Construction
Bronze impellers and impeller wear rings. [Cast iron] [ductile iron] pump
casing designed for the specified conditions. Bearings shall be oil
lubricated. Equip casing with tapped openings for suction and discharge
gages. Provide gages in openings. Mount pump and driver on a fabricated
steel bed plate having a drip collection chamber with tapped drain
openings. Provide lifting attachments for installation and maintenance.
2.14.4.2
Drives
Variable speed motors and turbines direct connected to the respective pumps
with a gear type flexible coupling. Provide shaft and coupling guards.
a.
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 [_____] with
inlet steam pressure of [_____] kPa (gage) psig and [_____] degrees
C F, normal exhaust back pressure of 34 kPa (gage) 5 psig and 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
hand valve.
(1) Turbine construction: Turbine casing split on the horizontal
or vertical 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.
(2) Turbine bearings shaft: Ring oiled, anti-friction type. The
shaft shall be stainless steel or chrome plated under the packing
glands. Shaft seals shall be segmented carbon rings with springs
SECTION 15502N
Page 152