loading from the piping system. The bases shall be pitched to a low point
drain. The complete pump and motor assembly shall be shop aligned, using
shims on both the pump and the motor.
2.13.1.3
Pump Coupling and Guard
Pumps shall be furnished with nonlubricated flexible-disc couplings and a
coupling guard. Couplings shall be spacer-type to permit removal of the
mechanical seals and limited-end-float-type for pumps with sleeve bearings.
2.13.1.4
Recirculation Control Valve
Pumps shall be furnished with a self-contained automatic recirculation
control valve that shall be sized for nominally 25 percent of the pump's
BEP flow.
2.13.1.5
Pump Testing
Pumps shall be subjected to shop hydrostatic testing. One pump in each
service shall be subjected to complete shop performance tests 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.
2.13.1.6
Instrument Panel
Each HTW circulation pump shall be provided with an instrument panel. The
construction and arrangement of the gauge panel shall be as indicated.
Nameplates that conform to shall be provided designating the pump number
and service. Letters shall be 6.4 mm 1/4 inch high. Gauges shall be
surface panel mounted. The instruments shall be as specified above and
shall include one single-element pressure gauge for the pump suction, one
duplex pressure gauge with two elements to indicate flow pressure on each
side of the pump discharge regulating valve, and one dial type thermometer
to indicate the discharge temperature. Suitable identification letterings
shall be supplied either on the gauge dial or on a nameplate adjacent to
the gauge identifying the service of the gauge. A suitable stainless steel
socket with cover for a separable socket-type test thermometer shall be
installed in the pump discharge piping at each circulation pump for future
insertion of a test thermometer. Pressure gauges shall have a gauge valve
and a pigtail siphon as specified installed at the point of connection with
the main piping. Pressure gauges connected to the pump discharge shall
have pulsation dampeners or snubbers.
2.13.2
Emergency Makeup Water Pump
Emergency makeup water pump shall be the centrifugal type. Pump shall be
the split case, 2 stage type with closed impellers and radial or mixed
flow. Pump shall be designed to handle high temperature water at 122
degrees C 250 degrees F, specific gravity of 0.942, pH of 9.5 to 10.5, and
shall have the capacity and head indicated.
2.13.3
Makeup Water Pumps
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NOTE: If inadequate NPSH is available, the designer
SECTION 15555A
Page 54
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