BLACKMER HD942A, Инструкции по установке, эксплуатации и обслуживанию

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INSTALLATION
CB9A-030 page 8/28
SEAL ARRANGEMENTS
These compressors are furnished with three types
of piston rod seals. The type used is noted by the 6
th
digit of the compressor's ID Number on the nameplate.
Refer to the section 'SEAL REPLACEMENT' for
drawings of the
three seal types.
Hazardous gases
can cause property
damage, personal
injury or death
Improper seal installation could release
explosive gas to the atmosphere
creating an explosion hazard, possibly
causing severe personal injury or death.
Seal Types A and B
These two seal types are the same except for the
number of packing sets used. The 1/8" and 1/4" seal
openings in the cylinder should be plugged as they
serve no function with these seal arrangements.
The crosshead guide casting includes four 1/4" NPT
openings into the distance piece area. This is the area
separating the upper and lower sets of packing. If
desired, the upper openings may be connected to a
vent line. Such a vent should be at a pressure lower
than suction pressure.
The lower distance piece openings are typically used
to drain any oil that might accumulate in the distance
piece. Only one opening need be used.
Seal Type D
This seal arrangement is designed to allow the
packing to be vented if desired. Vent openings to
each rod's packing are located in the cylinder casting
below the valves. The 1/8" openings should remain
plugged as they serve no function with this packing
arrangement. The 1/4" openings may be plugged or
vented as desired. If vented, the vent line should be at
a pressure lower than the suction pressure to the
compressor. Note that each rod packing will need a
vent line.
The crosshead guide casting includes four 1/4" NPT
openings into the distance piece area. This is the area
separating the upper and lower sets of packing. If
desired, the upper openings may be connected to a
vent, pad or purge line:
Vent - The distance piece vent should be at a
pressure lower than suction pressure.
Pad - The distance piece may be padded with an
inert gas at most any desired pressure. A
pad pressure above suction pressure
combined with a packing vent mentioned
above would be typical.
Purge - Similar to the inert gas pad, except that a
continuous flow of padding gas is
maintained in the distance piece area.
Both of the upper openings would be used:
one for purge gas IN and one for purge gas
OUT.
The lower distance piece openings are typically used
to drain any oil that might accumulate in the distance
piece. Only one opening need be used.