engine-driven primary pump. Secondary pumps shall be electric motor driven
and have automatic controllers. Raw-water circulating pump shall be
controlled by manual-off-automatic controllers and shall be [electric
motor] [engine] driven.
2.5.2
Heat Exchanger
Each heat exchanger shall be of a size and capacity to limit the maximum
allowable temperature rise in the coolant across the engine to that
recommended and submitted in paragraph SUBMITTALS for the maximum summer
outdoor design temperature and site elevation. Each heat exchanger shall
be corrosion resistant, suitable for service in ambient conditions of
application.
2.5.2.1
Fin-Tube-Type Heat Exchanger (Radiator)
**************************************************************************
NOTE: Retain this paragraph and remove the next one
as required by the project.
**************************************************************************
Heat exchanger may be factory coated with corrosive resistant film,
provided that correction measures are taken to restore the heat rejection
capability of the radiator to the initial design requirement via over
sizing, or other compensating methods. Internal surfaces shall be
compatible with liquid fluid coolant used. Materials and coolant are
subject to approval by the Contracting Officer. Heat exchangers shall be
pressure type incorporating a pressure valve, vacuum valve and a cap. Caps
shall be designed for pressure relief prior to removal. Each heat
exchanger and the entire cooling system shall be capable of withstanding a
minimum pressure of 48 kPa 7 psi and shall be protected with a strong
grille or screen guard. Each heat exchanger shall have at least two tapped
holes; one tapped hole shall be equipped with a drain cock, the rest shall
be plugged.
2.5.2.2
Shell and U-Tube Type Heat Exchanger
**************************************************************************
NOTE: Retain this paragraph and remove the one
above as required by the project.
**************************************************************************
Heat exchanger shall be multiple pass shell and U-tube type. Exchanger
shall operate with low temperature water in the shell and high temperature
water in the tubes. Exchangers shall be constructed in accordance with
ASME BPVC SEC VIII D1 and certified with ASME stamp secured to the unit.
U-tube bundles shall be completely removable for cleaning and tube
replacement and shall be free to expand with the shell. Shells shall be
constructed of seamless steel pipe or welded steel. Tubes shall be
cupronickel or inhibited admiralty, constructed in accordance with ASTM B
395/B 395M, suitable for the temperatures and pressures specified. Tubes
shall not be less than 19 mm 3/4 inch unless otherwise indicated. Shell
side and tube side shall be designed for 1.03 MPa 150 psig working pressure
and factory tested at 2.06 MPa 300 psig. High and low temperature water
and pressure relief connections shall be located in accordance with the
manufacturers standard practice. Water connections larger than 75 mm 3
inches shall be ASME Class 150 flanged. Water pressure loss through clean
tubes shall be as recommended by the engine manufacturer. Minimum water
velocity through tubes shall be 300 mm/sec 1 fps and assure turbulent flow.
SECTION 16263A
Page 43
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