2.3.10.6
Steam Turbines
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NOTE: Steam driven boiler auxiliaries will not be
used unless the exhaust steam can be used
completely. It is recommended that a life cycle
cost study be performed to determine if this section
is applicable. Reference to steam drives will be
deleted if inapplicable for the equipment specified.
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Steam turbines for boilerfeed pump shall operate the pump properly in a
steam pressure range of [_____] kPa psig with steam back-pressure of
[_____] kPa psig. Turbines shall have horizontally-split, two-piece,
centerline supported casings, water-cooled bearing cases with ring-oiled,
babbitt lined, bronze packed sleeve bearings. Turbines shall also be
equipped with a mechanical shaft speed governor and valve, independent
over-speed emergency governor and trip valve, reed tachometer, constant
pressure type governor, insulation with removable metal jacket, oil-sight
glasses with guards, stainless steel steam strainer that is removable
without disconnecting piping, any special wrenches and tools required for
servicing the turbine, and a sentinel warning on the exhaust casings.
Turbines shall conform to NEMA SM 23.
2.3.10.7
Electric Motor Drives
Electric motors shall be selected for continuous duty and nonoverloading
characteristics suitable for the power characteristics available. Motors
shall be [splashproof] [totally enclosed, nonventilated] [totally enclosed,
fan-cooled type] [totally enclosed, fan-cooled type, suitable for
installation in a Class II, Division 1, Group F hazardous location in
accordance with NFPA 70]. Motor starter shall be magnetic, reduced voltage
start type with [general-purpose] [weather-resistant] [water-tight]
[dust-tight] [explosion-proof] enclosure.
2.3.10.8
Shop Hydrostatic Testing
All pumps shall be subjected to shop hydrostatic testing. One pump in each
service shall be subjected to a complete shop performance test to
demonstrate that, at rated capacity, head is within a margin of plus 3
percent and minus 0 percent of design; efficiency is within a tolerance of
minus 0 percent; NPSH at the pump's BEP and at the rated condition is
within a margin of plus 0 percent and minus 10 percent. Performance tests
shall be in accordance with API Std 610. Procedures and results shall be
subject to the approval of the Contracting Officer.
2.3.10.9
Control Location
Boiler feedwater pumps shall be started through the combustion
equipment/boiler panel, manual/automatic switch.
2.3.11
Condensate Pumps
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NOTE: If inadequate NPSH is available, the designer
shall give consideration to substituting either a
double suction or positive displacement pump.
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SECTION 15846A
Page 37
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