7.5 - Pressure and Temperature Limits
70
SBT-2400 Appendix
M2041/5en
©BTG 2006
7.5 Pressure and Temperature Limits
Pressure and temperature limits for piping, pipe flanges and fittings of stainless
steel — according to Swedish Standard SMS 1233:
For conversion to SI-units: 1 at
9.8 N/cm²
Maximum operating pressure:
Maximum operating pressures under normal conditions are given in the table
below. The values stated must not be exceeded by more than 5%. However,
the operating pressure must never exceed the nominal pressure (PN).
The diagram in Fig 15 shows maximum operating pressure for different pres-
sure classes at different operating temperatures.
Stainless steel En 14404 according to SS 142343 (SS 316L).
EXAMPLE:
What is maximum operating pressure at 100°C operating temperature and
pressure class PN 10?
Answer:
8 ato
8 bar.
(ato = atmosphere (atm) overpressure)
≈
≈
PN
Max operating pressure ato
Operating temperature ºC
0-20
30
40
50
60
70
80
90
100
120
140
160
180
200
250
6
6
5.5
5.5
5.5
5
5
5
5
4.5
4.5
4.5
4.5
4.5
4
4
10
10
9.5
9.5
9
9
8.5
8.5
8.5
8
8
7.5
7.5
7.5
7
7
16
16
15.5
15.0
14.5
14
14
13.5
13.5
13
12.5
12.5
12
12
11.5
11
25
25
24
23.5
23
22
22
21.5
21
20.5
19.5
19
18.5
18.5
18
17.5
Fig 15 Max. operating pressure at
different operating
temperatures
