7.1.1 The
minimum thickness of austenitic stainless steel pipes in Class I and
II piping systems is to be in accordance with an acceptable pressure
piping standard using a suitable corrosion allowance.
7.1.4 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.
Table 4.7.1 Minimum thickness for austenitic
stainless steel pipes
| Standard pipe sizes
(outside diameter) in mm
|
Minimum thickness,
in 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.
|