MIL-HDBK-1003/3
(2) Put a pressure gage immediately downstream of
the regulator pilot tap. The pressure gage range should include
the upstream inlet pressure.
(3) Provide a relief valve on the downstream side
that will handle 150 percent of the wide open failure flow rating
of the regulator. Set the relief valve higher than the
downstream operating pressure, and pipe the relief valve
discharge to a safe place.
(4) Provide shutoff valves on each side of the
regulator assembly; with the low side shutoff valve downstream of
the pilot tap.
(5) Locate the entire regulator assembly in an
accessible place.
7.3.3.5 Condensate Pumps and Flash Tank. Higher pressure steam
condensate is hotter than low pressure steam condensate. If the
system is over 40 psi steam, always run the condensate through a
flash tank before entering the receiver of the condensate pump
set. This prevents the condensate flashing to steam in the
pumps. See Figure 24.
7.3.3.6 Steam Coils - General. Refer to par. 7.2.2.2 and the
manufacturer's capacity tables for selection. See Figures 25 and
26 for piping steam coils. Always provide steam traps for each
coil section. Steam distributing coils feature a perforated
distributing header inside the main coil construction.
7.3.3.7
Steam Traps. In a steam system, steam traps should be
provided to remove condensate and gas from the steam supply as
soon as it forms. Unless this is done:
a)
A slug of condensate can harm the system.
2
b)
Accumulation of CO
gas can cause corrosion.
See Table 14 for common types of steam traps and Figure 27 for
piping of a low pressure drip.
7.3.4
Boilers. Size the steam boiler in accordance with the
ASHRAE Equipment Handbook, and include building heating, process
steam, domestic water heating, and pickup loads. See Figure 28
for piping a low pressure steam boiler.
92
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