shall give consideration to substituting either a
double suction or positive displacement pump.
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Makeup water pumps shall be horizontal, end-suction, single-stage,
centrifugal, motor-driven pumps. Pumps shall have stainless steel shafts
and bronze impellers. Pumps shall be provided with stuffing boxes.
Lubrication shall be by splash oil with oil level sight glass provided.
Pumps shall be subjected to the same tests specified for the HTW
2.13.4
LTW Circulation Pump
The pump shall be the centrifugal type. Pump shall be the end suction,
single stage type with closed, open, or semi-open impellers and radial or
mixed flow. Pump shall be designed to handle low temperature water at 110
degrees C 225 degrees F and shall have the capacity and head indicated.
2.14
LTW EXPANSION TANK
LTW expansion tank in connection with the LTW water heater shall be
constructed in accordance with ASME BPVC SEC VIII D1 and shall have the
dimensions indicated. The tank shall have the openings indicated and shall
be provided with a protected gauge glass and manual air vent. The tank
shall be tested hydrostatically at 1-1/2 times the working pressure or at
690 kPa 100 psig, whichever is greater.
2.15
HEAT EXCHANGERS
2.15.1
Water Heaters
Water heaters shall be of the types indicated and shall be provided with
thermostatic control valves, valved bypasses, strainers, and
temperature/pressure relief valves. Thermometers shall be provided where
shown. Temperature and pressure relief valves shall conform to the
requirements of ANSI Z21.22. Separate valves shall be provided if input
exceeds 29.3 kW 100,000 BTU/H or storage capacity exceeds 454 L 120 gallons.
Thermostatic control valves shall be installed in the HTW return line from
each water heater coil. The valve shall be installed to operate in
conjunction with a remote bulb temperature controller and shall conform to
the requirements of paragraph on thermostatic regulating valves. Valves
shall be flanged, minimum Class 300 300 pound class, and sized for the
service by the manufacturer. Instantaneous water heaters shall be
shell-and-tube design conforming to the applicable requirements of TEMA Stds,
Class C. The heater shell shall be steel and shall be designed for [_____]
kPa psi and [_____] degrees C degrees F temperature. The coil shall be
U-tube type designed for high temperature water at [_____] kPa psi
pressure. The coil tubing shall be 16 mm 5/8 inch or 19 mm 3/4 inch size,
constructed of No. 16 AWG cupronickel (90 percent/10 percent).
2.15.2
LTW Heat Exchanger for Fuel Oil Heating
The heater shall be instantaneous shell-and-tube type conforming to the
applicable requirements of TEMA Stds, Class C. The heater shell shall be
steel and shall be designed for [_____] kPa psi pressure and [_____]
degrees C degrees F temperature. The coil shall be U-tube type designed
for HTW at [_____] kPa psi pressure. The coil shall be constructed of No.
16 AWG 16 mm 5/8 inch or 19 mm 3/4 inch cupronickel (90 percent - 10
percent) tubing.
SECTION 15555A
Page 55
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