Parr Instrument Series 4540 - Manual (Page 10)

4540 High Pressure Reactor System
P a r r I n s t r u m e n t C o m p a n y 10
PRESSURE GAGE
209HC4
208HC15
56HCPH
A455VB2
1446HC
491HCAD
A451VB
208HC6
209HC4
INLET SAMPLING VALVE
209HC4
208HC11
A455VB2
GAS RELEASE VALVE
OTHER VESSEL HEAD FITTINGS
Safety Rupture Disc
There is a safety rupture disc attached to the head
that is intended to rupture and release the pressure
before it reaches a dangerous level. A metal tag
wired to the safety head identifies the burst pres-
sure at room temperature for that particular disc.
A similar tag is furnished with each replacement
disc. This tag must remain with the apparatus at all
times so that both present and future operators will
be aware of the disc rating. Users should read the
discussion of rupture discs given in the Instruction
Sheet No. 231M for a complete description of the
characteristics of rupture discs and the precautions
to be observed when operating pressure equipment
protected by this type of safety device.
A typical pre-bulged disc can be used to 90% of the
rating on the tag. For additional protection, the user
should install an adequate and safe venting system
for removing any toxic, flammable or volatile mate-
rial which would be released if the rupture disc
should burst. A connector for attaching 3/8” OD
tubing to the discharge port of the rupture disc is
provided for this purpose.
Type J Thermocouple
A Type J thermocouple in a 1/8” dia. Stainless steel
sheath is furnished with the reactor. Insert this ther-
mocouple into the head thermowell and connect it
to the thermocouple socket on the rear panel of the
temperature controller using the A470E2 extension
wire furnished with the controller.
Pressure Gage
A pressure gage, usually 0-7500 psi with a T316
stainless steel Bourdon tube, is mounted on the
head using attachment fittings similar to those used
for the inlet/sampling valve assembly.
Gage and Valve Adapters
The pressure gage and the combined gas inlet and
sampling valves are attached to the head with an
adapter which allows these fittings to be drawn up
tightly when facing in any direction. To attach these
fittings to the head, screw the gage or valves firmly
into the adapter, then run the 209HC4 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. Now hold the fitting
firmly in place and close the joint by tightening the
209HC4 bushing. This connection can be made and
broken repeatedly without destroying the sealing
faces. A light coating of thread lubricant, such as
Parr No. 424HC2 High Temperature Anti-Seize Lube,
applied to the 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 on the straight
threads of the 209HC4.