2.9.4.2
Construction
Condensate pumps shall have bronze impellers and impeller wear rings. Pump
casings shall be [cast iron] [ductile iron], and shall be designed for the
specified conditions. Bearings shall be oil lubricated. Casings shall
have tapped openings for suction and discharge pressure gages. Provide
suction and discharge pressure 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.
2.9.4.3
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NOTE: The designer shall perform an economic
analysis and make a technical evaluation to
determine if the boiler feed or condensate pump
motors shall be provided with variable speed
control. Generally, variable speed drives for
boiler feed or condensate pumps over 5 1/2 kW 7 1/2
HP will be cost effective.
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[Variable speed], [open driproof], [totally enclosed], [fan cooled],
[_____] volt, three phase, 60 Hz of not less than [_____] kW hp, as
specified under paragraph entitled "Motors and Drives" [and "Variable Speed
Control For Motors"] in this section. [Variable speed] electric motors
direct connected to the respective pumps with a gear type flexible
coupling. Provide shaft and coupling guards.
2.9.4.4
Steam Turbines
Single stage, rated at not less than [_____] kW hp, with inlet steam
pressure of [_____] kPa (gage) psig and [_____] degrees C F, normal exhaust
back pressure of 20 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 per BkW per second pounds per BHP per hour.
Provide a stainless steel steam strainer, sentinel relief valve, sight oil
level indicator and one hand valve. [Variable speed] turbines direct
connected to the respective pumps with a gear type flexible coupling.
Provide shaft and coupling guards.
a.
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) 250 psig at 232
degrees C 450 degrees F at inlet, and 379 kpa (gage) 55 psig at
232 degrees C 450 degrees F at the outlet.
b.
Turbine Bearings Shaft: Ring oiled, anti-friction type. Shaft
shall be stainless steel or chrome plated under the packing
glands. Shaft seals shall be segmented carbon rings with springs
and stops.
c.
Speed Governor: Variable speed governor for speed limiting and
pneumatic operator to maintain an adjustable preset level in
[deaerator tank] [condensate receiver] by variation of turbine
speed. Input to the operator shall be a 34 to 103 kPa (gage) 3 to
15 psig pneumatic signal and vary the turbine speed from minimum
to full speed in a linear response. Maximum and minimum speed
SECTION 15511N
Page 58
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