2.5.2.2
Shell and U-Tube Type Heat Exchanger
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NOTE: Keep this paragraph and delete paragraph
above, if required by the project.
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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 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 temperature and pressure specified. Tubes shall be not
less than 19 mm 3/4 inch unless otherwise indicated. Shell side and tube
side shall be designed for 1.03 kPa 150 psi working pressure and factory
tested at 2.06 kPa 300 psi. High and low temperature water and pressure
relief connections shall be located in accordance with the manufacturers
standard practice. Water connections larger than 76 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 1 foot per second and assure turbulent flow. One or
more pressure relief valves shall be provided for each heat exchanger in
accordance with ASME BPVC SEC VIII D1. The aggregate relieving capacity of
the relief valves shall be not less than that required by the above code.
Discharge from the valves shall be installed as indicated. The relief
valves shall be installed on the heat exchanger shell. A drain connection
with 19 mm 3/4 inch hose bib shall be installed at the lowest point in the
system near the heat exchanger. Additional drain connection with threaded
cap or plug shall be installed wherever required for thorough draining of
the system.
2.5.3
Expansion Tank
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NOTE: Delete this paragraph if a shell and U-tube
type heat exchanger is not needed.
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The cooling system shall include an air expansion tank which will
accommodate the expanded water of the system generated within the normal
operating temperature range, limiting the pressure increase at all
components in the system to the maximum allowable pressure at those
components. The tank shall be suitable for an operating temperature of 121
degrees C 250 degrees F and a working pressure of 0.86 MPa 125 psi. The
tank shall be constructed of welded steel, tested and stamped in accordance
with ASME BPVC SEC VIII D1 for the stated working pressure. A bladder type
tank shall not be used. The tank shall be supported by steel legs or bases
for vertical installation or steel saddles for horizontal installation.
2.5.4
Ductwork
Ductwork shall be as specified in Section [_____] except that a flexible
connection shall be used to connect the duct to the diesel engine radiator.
Material for the connection shall be wire-reinforced glass. The
connection shall be rendered practically airtight.
SECTION 16264A
Page 36
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