Section
9 Stainless steel piping and components
9.1 General
9.1.1 Stainless
steels may be used for a wide range of services and are particularly
suitable for use at elevated temperatures. For guidance on the use
of Austenitic steels in sea water systems, see
Vol 2, Pt 7, Ch 1, 17.3 Steel pipes 17.3.4.
9.1.2 The
minimum thickness of stainless steel pipes is to be determined from
the formula given in Vol 2, Pt 7, Ch 1, 6.1 Wrought steel pipes and bends 6.1.3 or Vol 2, Pt 7, Ch 1, 6.1 Wrought steel pipes and bends 6.1.4 using a corrosion allowance
of 0,8 mm. Values of the 1,0 per cent proof stress and tensile strength
of the material for use in the formula in Vol 2, Pt 7, Ch 1, 6.1 Wrought steel pipes and bends 6.1.1 may be obtained from Table 6.5.2 Mechanical properties for
acceptance purposesof the Rules for Materials.
9.1.3 Where
stainless steel is used in lubricating oil and hydraulic oil systems,
the corrosion allowance may be reduced to 0 mm. For pipes passing
through tanks, an additional corrosion allowance is to be added to
take account of external corrosion; the addition will depend on the
external medium and the value is to be in accordance with Table 1.6.3 Values of c for steel pipes .
9.1.4 In no
case is the thickness of stainless steel pipes to be less than that
shown in Table 1.9.1 Minimum thickness for stainless
steel pipes.
Table 1.9.1 Minimum thickness for stainless
steel pipes
Standard pipe sizes,
(outside diameter),
in mm
|
Min.nominal
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.
|
9.1.6 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.
|
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