MIL-HDBK-1003/3
f)
Steam flow
g)
Trap size and rating
h)
Shell pressure rating
i)
Tube bundle pressure rating
j)
Control Valve Cv
k) Temperature control scheme (e.g., resetting the
water temperature from the outdoor temperature)
Converters shall be ASME rated and stamped. Detail the
supports for the converter and the expansion tank. See Figures
16 and 17.
7.2.2.6
Pumps. In hydronic systems that are larger than
residential size, a two pipe system with a circulating pump is
required to make the heating system responsive to load changes.
Note the following:
a) Provide a pressure gage on each side of the pump,
or a differential gage connected between pump suction and
discharge to facilitate system balancing.
b) Provide flow gages in the branches of multizone
systems to facilitate balancing.
c) Provide gate valves and unions or flanges on inlet
and outlet piping to equipment to expedite future removal and
repairs.
d)
Provide strainers on the suction side of the pump.
e) Do not overestimate the pumping head on the pump.
A conservative overestimation of the head can result in the pump
delivering more than the required gpm and thereby requiring more
horsepower than estimated. There are three solutions to this:
(1)
Specify a pump that is non-overloading,
(2) Show a throttling valve in the pump discharge
to increase the head if needed, and
(3)
Remove the impeller and machine it to reduce
capacity.
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