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a. The pressure of the condensate in the steam supply line will cause water hammer and subsequent heat
exchanger (steam coil) failure. The steam supply connection into the main supply line
must be
made
with a minimum 12-inch (30.48 cm) riser. This will prevent any condensate from draining towards the
dryer.
b. The steam supply line to the dryer must include a 12-inch (30.48 cm) riser along with a drip trap and
check valve. This will prevent any condensate from entering the steam coil.
c. Flexible hoses or couplings
must be
used. The dryer vibrates slightly when it runs and this will cause
the steam coil connections to crack if they are hard piped to the supply and return mains.
d. Shutoff valves for each dryer
should be
installed in the supply line, return line, and drip trap return line.
This will allow the dryer to be isolated from the supply main and the return main if the dryer needs
maintenance work.
e. Install an inverted bucket steam trap and check valve at least 12-inches (30.48 cm) below the steam
coil as close to the coil as possible.
1) An inverted bucket steam trap with a capacity of 1,200 lbs (544 kg) of condensate per hour @ 125
PSI (8.62 bar) is required for each unit.
f. Dryers with optional solenoid valve
must be
mounted with coil positioned directly above the valve body.
g. The supply line and the return line
should be
insulated. This will save energy and provide for the safety
of the operator and maintenance personnel.
h. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly
causing steam coil damage.
ALL
horizontal runs of steam supply piping
should be
pitched 1/4-inch
(6.35 mm) for every 1 foot (0.31 meters) back towards the steam supply header causing the condensate
in the line to drain to the header. Install a bypass trap in any low point to eliminate wet steam.
Summary of Contents for Phase 7 / OPL ensor Activated Fire Extinguishing System D120
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