Parr Instrument 4575/76 HP/HT - Manual (Page 15)

w w w . p a r r i n s t . c o m
4575/76 HP/HT Pressure Reactors
15
General Maintenance Notes
1. Periodically inspect all electrical wiring and
pressure connections for excessive corrosion.
Suspect parts should be replaced by compo-
nents only supplied by Parr Instrument Com-
pany.
2. Always use appropriate wrenches on all fittings
and valves. Never use pliers or pipe wrenches.
3. Head and cylinder service fixtures are available
for convenience and protection of components
during maintenance of your reactor.
4. To reinstall straight thread (NPS) fittings to the
head, screw the gage or valves firmly into the
adapter. Run the bushing onto the threaded
stem as far as it will go. Screw this assembly
into the head until the nose of the adapter is
seated; then back it off until the valve or gage
is facing in the desired direction (no more than
one full turn). Hold the fitting firmly in place
and close the joint by tightening the bushing.
This connection can be made and broken re-
peatedly without destroying the sealing sur-
faces. A light coating of thread lubricant, such
as Parr High Temperature Anti-Seize Lubricant,
applied to the straight threads and to the nose
of the adapter will help to obtain a tight joint.
Note: PTFE tape should not be used
on this joint.
5. NPT (National Pipe Taper) threads should not
be disassembled any more than necessary. It
will become increasingly difficult to maintain a
tight seal with these tapered threads if the joint
is made and broken repeatedly. Grafoil tape or
PTFE tape (if temp allows) should be used on
all NPT threads.
6. Do not use oil or anti-seize lubricant on threads
or fittings if the vessel is to be used with oxy-
gen.
7. If your vessel is equipped with a loose com-
pression ring be sure that it is in place on the
head before attaching any head fittings. The
compression ring cannot be installed after fit-
tings have been screwed into the head.
8. Clean all threads and gas passages thoroughly
and remove all tape fragments when overhaul-
ing a vessel. An ultrasonic bath is excellent
for cleaning metal parts, but do not place a
thermocouple probe, pressure gage, face seals
or ball bearings in an ultrasonic bath. Periodic
cleaning may be performed on the exterior sur-
faces of the reactor stand with a lightly damp-
ened cloth containing mild soap solution. All
power should be disconnected when cleaning.
9. Routinely inspect cap screws on split ring
closure for lubrication and cleanliness. These
screws should not be allowed to dry because
the threads will seize. Regularly apply Parr
High Temperature Anti-Seize Lubricant (Parr No.
424HC2) before this happens.
10. To operate reactors equipped with an air motor,
connect air hose to a compressed air line. For
best torque and speed control the piping to the
motor should be at least 3/8” IPS or larger. Fill
the oiler with SAE 10 oil and adjust the oiler
feed one drop per minute into the air stream.
For long continuous runs at high speeds the
oiling rate should be increased to three drops
per minute. If the motor becomes sluggish,
flush it with a non-flammable solvent in a well
ventilated area.
Disconnect the air line and muffler and pour
a small amount of solvent into the inlet port.
Rotate the shaft by hand in both directions for
a few minutes; then connect the air line and
run the motor until there is not further trace of
solvent in the exhaust. If the muffler is dirty,
replace it. Re-lubricate the motor with a squirt
of oil into the chamber and reassemble.
11. If servicing assistance is needed, contact Parr
Instrument Company directly at 800-872-7720
or at the address shown on the back of these
instructions.