Parr Instrument 4575/76 HP/HT - Manual (Page 6)

P a r r I n s t r u m e n t C o m p a n y
4575/76 HP/HT Pressure Reactors
6
Installation
Pressure and Temperature Limits
The working pressure and temperature at which any
reactor or pressure vessel can be used will depend
upon the design of the vessel and the materials
used in its construction. Since all materials lose
strength at elevated temperatures, any pressure
rating must be stated in terms of the temperature at
which it applies. The standard material of construc-
tion for Parr Instrument Company Vessels is Type 316
Stainless Steel.
Limits for vessels made of other materials and for
other operating temperatures can be obtained from
Parr Customer Service. No attempt should be made
to increase these limits by making alterations or
by substituting components which are not recom-
mended by Parr Instrument Company. It must also
be understood that lower pressure and temperature
limits may be required for modified reactors and for
vessels made of special alloys.
Limits for vessels will be determined by the physi-
cal characteristics of the vessel material and will be
prescribed on an individual basis.
The maximum working pressure and temperature
for any vessel is governed by the design of the
vessel and the strength of the material from which
it is constructed. There is also a close relationship
between working pressure and temperature since
the strength of any material will normally fall off
as the temperature is increased. Temperature and
pressure limits are also affected by the physical
properties and temperature limits of the gaskets and
seals used in the vessel, and by any valves, gages
or other fittings attached to the vessel. Obviously,
the safe operating pressure of any system can be no
higher than that of its lowest rated component.
All Parr reactors show the maximum safe operating
pressure and temperature imprinted on the cylinder.
The working pressure and temperature in these 250
mL and 500 mL reactors must not exceed the fol-
lowing maximum limits:
Pressure and Temperature Limits
Vessel
Material Maximum
Pressure
Maximum Temperature
T316SS 5000 psi 500 °C Flexible Graphite
Gasket
T316SS 5000 psi 350 °C PTFE Gasket
Assemble the Reactor
These reactors require at least 10 square feet of
workspace on a sturdy bench, table, or floor in a
well ventilated area with convenient access to an
electric outlet, running water, and a drain. If the
tabletop is not heat resistant it would be ideal to
provide an insulated pad on which to set the vessel
when it is hot.
1. Set the stand in the workspace.
Bolt the stand to the bench top using the
holes in the base plate.
2. Set the Reactor Controller near the reactor, leav-
ing a space of at least six inches between the
controller and the base of the reactor so that the
controller will not be unduly affected by radiant
heat. Connect the reactor to the controller using
information contained in its Instruction Manual
548M or follow the steps below.
Labeled connections are provided on the rear
panel of the controller.
Parr Cooling Only:
The Parr Cooling output connector is to be used
only with Parr Instrument Company cooling sole-
noid valve assemblies supplied with the appro-
priate cooling power cord.
Parr Heating Only:
The Parr Heating output connector is to be used
only with Parr Instrument Company heater as-
semblies supplied with the appropriate heater
power cord.