5.1.1 Copper
and copper alloy pipes are acceptable for a wide range of services,
including bilge pipework and where non heat-sensitive material is
required.
5.1.2 The maximum permissible service temperature of copper and copper alloy
pipes, valves and fittings is not to exceed 200°C for copper and aluminium brass and
300°C for copper-nickel. Cast bronze valves and fittings complying with the requirements
of Ch 9 Copper Alloys may be accepted up to 260°C.
5.1.3 The
minimum thickness of copper and copper alloy pressure pipes is to
be in accordance with an acceptable pressure piping code or standard
except that in no case is it to be less than that shown in Table 4.5.1 Minimum thickness for copper and
copper alloy pipes.
Table 4.5.1 Minimum thickness for copper and
copper alloy pipes
| Standard pipe sizes (outside diameter)
|
Minimum overriding nominal thickness
|
| Copper
|
Copper alloy
|
| mm
|
mm
|
mm
|
| 8
|
to
|
10
|
1,0
|
0,8
|
| 12
|
to
|
20
|
1,2
|
1,0
|
| 25
|
to
|
44,5
|
1,5
|
1,2
|
| 50
|
to
|
76,1
|
2,0
|
1,5
|
| 88,9
|
to
|
108
|
2,5
|
2,0
|
| 133
|
to
|
159
|
3,0
|
2,5
|
| 193,7
|
to
|
267
|
3,5
|
3,0
|
| 273
|
to
|
457,2
|
4,0
|
3,5
|
| 508
|
and
|
over
|
4,5
|
4,0
|
5.1.4 Pipes
are to be seamless, and branches are to be provided by cast or stamped
fittings, pipe pressing or other approved fabrications.
5.1.5 Brazing
and welding materials are to be suitable for the operating temperature
and for the medium being carried.
5.1.6 Where
silver brazing is used, strength is to be obtained by means of the
bond in a capillary space over the whole area of the mating surfaces.
A fillet braze at the back of the flange or at the face is undesirable.
The alloy used for silver brazing is to contain not less than 49 per
cent silver.
5.1.7 The
use of copper-zinc brazing alloy is not permitted.