Parr Instrument Series 4558 - Manual (Page 24)

4555 - 58 Series
5G & 10L Pressure Reactors
- 23 -
GENERAL MAINTENANCE NOTES
1. Periodically inspect all electrical wiring and pressure connections for excessive corrosion
or wear. Suspect parts should be replaced by components only supplied by Parr Instrument
Company.
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 repeatedly without destroying the sealing surfaces. 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 be used only on all tapered (NPT) threads, not NPS straight threads.
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.
6. Do not use oil or anti-seize lubricant on threads or fittings if the vessel is to be used with
oxygen.
7. If your vessel is equipped with a loose compression ring, be sure that it is in place on the
head before attaching any head fittings. The compression ring cannot be installed after
fittings have been screwed into the head.
8. Clean all threads and gas passages thoroughly and remove all tape fragments when
overhauling 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 surfaces of the reactor stand with
lightly dampened 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. It is
important to clean and lubricate periodically with Parr High Temperature Anti-Seize
Lubricant so that the required torque is accurately applied.