Burst
Plug
Temperature
Effects
A
burst
plug
(aka
rupture
disk)
is
used
to
mitigate
overpressure
conditions.
The
burst
plug
is
used
as
an
intentional
weak
link
in
a
process
system.
It
is
designed
to
rupture
at
a
predetermined
process
pressure
called
the
“burst
pressure,”
thereby
protecting
people,
products,
and
processes.
The
Dynisco
Burst
Plug
(Model
420)
body
is
made
of
303
stainless
steel
and
a
rupture
disk
of
Inconel
that
will
withstand
the
rigors
of
plastic
extrusion
systems.
The
BP420
is
available
in
several
pressure
ranges,
lengths,
and
fittings.
While
the
Inconel
rupture
disk
has
a
900˚F/482˚C
max
temperature
rating,
it
is
still
influenced
by
temperature.
In
other
words,
the
properties
of
the
Inconel
metal
change
slightly
with
changes
in
temperature.
The
burst
pressure
specification
is
actually
established
at
room
temperature
(~72˚F/22˚C).
However,
as
the
process
temperature
increases,
the
burst
pressure
decreases,
as
a
percentage
of
the
burst
pressure
range.
Since
the
burst
pressure
decreases
with
increasing
temperature,
it
is
important
to
select
the
right
pressure
range
at
the
outset,
especially
if
the
process
is
on
the
higher
end
of
the
pressure
range
and
temperature.
The
following
table
details
the
effects
of
process
temperature
on
the
burst
pressure
range.
The
˚F/C
temperature
is
the
process
temperature.
The
%Effect
is
the
additive
or
subtractive
effect
on
the
pressure
range.
For
example,
a
burst
plug
selected
at
10,000psi
would
be
94%
effective
at
a
process
temperature
of
580˚F/304˚C,
meaning
the
burst
plug
would
safely
release
at
94%
of
the
specified
pressure
range,
or
9,400psi.
So
if
the
customer’s
process
is
at
the
high
end
of
pressure
and
temperature,
you
might
want
to
advise
using
a
higher
pressure
range
burst
plug.
However,
you
must
also
keep
in
mind
that
installing
a
burst
plug
at
a
burst
pressure
that
is
too
high
will
defeat
the
purpose
of
installing
this
safety
device.
The
burst
plug
selection
is
not
complicated,
but
it
does
involve
a
few
variables
that
need
to
be
taken
into
consideration.
Temperature
Effects
˚F
30
40
50
60
72
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
˚C
‐1
4
10
16
22
27
32
38
43
49
54
60
66
71
77
82
88
93
99
104
110
116
121
127
132
138
143
149
154
160
165
171
177
182
%
Effect
105
104
103
101
100
100
99
99
99
98
98
98
97
97
97
96
96
95
95
95
95
95
95
94
94
94
94
94
94
94
94
94
93
93
˚F
370
380
390
400
410
420
430
440
450
460
470
480
490
500
520
540
560
580
600
620
640
660
700
720
740
760
780
800
820
840
860
880
900
˚C
188
193
199
204
210
216
221
227
232
238
243
249
254
260
271
282
293
304
316
327
338
349
371
382
393
404
416
427
438
449
460
471
482
%
Effect
93
93
93
93
93
93
93
93
93
93
93
93
94
94
94
94
94
94
94
94
94
93
93
93
93
93
93
93
93
93
93
93
93