9.1.1 Stainless
steels may be used for a wide range of services.
9.1.2 Austenitic
and duplex stainless steels may be suitable for use at elevated temperatures.
Application, environment, operating temperature and time at temperature
must be considered in the choice of austenitic or duplex stainless
steel grade.
9.1.5 In no
case is the thickness of stainless steel pipes to be less than that
shown in Table 1.9.1 Minimum thickness for austenitic
and duplex stainless steel pipes.
Table 1.9.1 Minimum thickness for austenitic
and duplex stainless steel pipes
| Standard pipe sizes (outside diameter)
|
Minimum nominal thickness
|
| mm
|
|
mm
|
mm
|
| 8,0
|
to
|
10,0
|
0,8
|
| 10,2
|
to
|
17,2
|
1,0
|
| 21,3
|
to
|
48,3
|
1,6
|
| 60,3
|
to
|
88,9
|
2,0
|
| 114,3
|
to
|
168,3
|
2,3
|
| 219,1
|
|
|
2,6
|
| 273,0
|
|
|
2,9
|
| 323,9
|
to
|
406,4
|
3,6
|
| over
|
406,4
|
|
4,0
|
Note Diameters and thicknesses according to National or
International Standards may be accepted.
|
9.1.7 Where
pipework is butt welded, this should preferably be accomplished without
the use of backing rings, in order to eliminate the possibility of
crevice corrosion between the backing ring and pipe.