Parr Instrument Series 4550 - Manual (Page 11)

4550 Floor Stand Reactors
w w w . p a r r i n s t . c o m 11
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 pressure 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 pres-
ent 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 de-
scription 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 material 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 extension wire
furnished with the reactor.
Pressure Gage
The pressure gage furnished with this reactor has a T316
Stainless Steel Bourdon tube. Gages are furnished in
a variety of ranges to meet individual needs. Typically,
the gage and the rupture disc are furnished as matched
ranges. For applications where a gage is selected with
a range under 1000 psi, a relief valve is added and set
to protect the gage. A 1000 psi rupture disc is installed
as the fail-safe vessel protection.
For highly corrosive applications where the vapor
phase might corrode the stainless Bourdon tube, Parr
offers isolator assemblies in a variety of materials.
These isolators with their internal piston isolate the
vapors from the gage.
The gage adapter includes a ¼” NPT side port with a
plug installed. This position may be used for a variety
of fittings such as a needle valve, pressure transducer
or relief valve.
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 Tem-
perature Anti-Seize Lube, applied to the threads and to
the nose of the adapter will help to obtain a tight joint.
Note: Do not use PTFE tape on the straight thread
connections of the coned adapters and mating
bushings. PTFE tape should only be used on the (NPT)
threads such as the needle valves or gage connection.
208HC15
PRESSURE GAGE
56HC
209HC4
GAS RELEASE VALVE
658HC
A130VB
64 DO NOT SCALE DRAWING
REVISIONS
COMPANY. APPROVED
BY
BY
SCALE
DWG NO. DATE
DRAWN
OR BETTER
DESCRIPTION
DRAWN IN 3rd ANGLE PROJECTION
DATE
1:2
EWL
211 53rd STREET
07-22-13
PARR INSTRUMENT CO.
4550
MOLINE, ILLINOIS 61265
SIZE B
FOR 395M MANUAL, 4550 FLOOR REACTOR TOLERANCES
IN INCHES
UNLESS OTHERWISE SPECIFIED
1/X .... ±1/64
.00 .... ±.010
.000 .... ±.003
ANGULAR ... ±1/2°
UNMARKED RADII .03"
MACHINED SURFACES:
PROPRIETARY
NEITHER THE DRAWING
NOR INFORMATION
CONTAINED HEREIN
MAY BE COPIED,
REPRODUCED, OR
OTHERWISE USED
WITHOUT WRITTEN
PERMISSION FROM
PARR INSTRUMENT
395M_S10
A131VB
420HC2
209HC4
INLET SAMPLING VALVE
A129VB
208HC6