Parr Instrument Series 4580 - Manual (Page 8)

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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 construction for Parr
Instrument Company 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 recommended by the
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.
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 1.0 and 1.5 gallon reactors must not
exceed the following maximum limits:
Pressure and Temperature Limits
Bomb
Material
Maximum
Pressure Maximum
Temperature
T316SS 3000 psig 500
C Flexible
Graphite Gasket
T316SS 3000 psig 350
C PTFE
Gasket
T316SS 3000 psig 500
C Metal
Gasket