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« STEEL NUMBER / STEEL DESIGNATIONCorrespondence of terminology between ISO 3183 and its source documents »

API Pipes Tolerances for diameter and out-of-roundness

Tolerances for diameter and out-of-roundness

Specified
outside diameter

D
mm (in)
 
Diameter tolerances
mm (in)
Out-of-roundness tolerances
mm (in)
 
Pipe except the end a Pipe end a, b, c Pipe except the end a Pipe end a, b, c
SMLS pipe Welded pipe SMLS pipe Welded pipe
< 60,3 (2.375) - 0,8 (0.031) to + 0,4 (0.016)   d
≥ 60,3 (2.375)
to
≤ 168,3 (6.625)

± 0,007 5 D
 
- 0,4 (o.o16) to + 1,6 (0.063) 0,020 D 0,015 D
>168,3 (6.625)
to
≤ 610 (24.000)
± 0,007 5 D ± 0,007 5 D
but.maximum
of + 3,2 (0.125)
± 0,005 D,
but maximum of ± 1,6 (0.063)

> 610 (24.000)

to
≤ 1 422 (56.000)

 

± 0,01 D ± 0,005 D,
but.maximum
of + 4,0 (0.160)
± 2,0 (0.079) ±1,6 (0.063) 0,015 D
but maximum of 15 (0.6),
for d / t ≤ 75
0,01 D,
but maximum of 13 (0.5).
for d / t ≤ 75
by agreement
for d / t > 75
by agreement
for d / t > 75
> 1 422 (56 000) as agreed

a   The pipe end includes a length of 100 mm (4.0 in) at each of the pipe extremities.

b   For SMLS pipe, the tolerances apply for t ≤ 25.0 mm (0.984 in). and the tolerances for thicker pipe shall be as agreed.

c   For pipe with D ≥ 219,1 mm (8.625 in), the diameter tolerance and the out-of-roundness tolerance may be determined using the calculated inside      diameter (the specified outside diameter minus two times the specified wall thickness) or measured inside diameter rather than the specified      outside diameter.(see 10.2.8.3.)

d    lncluded in the diameter tolerance.



Table 11 --- Tolerances for wall thickness
Wall thickness
t
mm (in)
Tolerances a
mm (in)
SMLS pipe b
≤ 4,0 ( 0.157) + 0,6 (0.024)
- 0,5 (0.020)
> 4,0 ( 0.157) to <25,0 (0.984) + 0,150
- 0,125
≥ 25,0 (0.984) +3,7 (0.146) or + 0,1 t, whichever is the greater
- 3,0 (0.120) or - 0,1 t, whichever is the greater
Welded pipe c, d
≤ 5,0 (0.197) ± 0,5 (0.020)
> 5,0 (0.197) to <15,0 (0.591) ± 0,1 t
≥ 15,0 (0.591) ±1,5 (0.060)
a   if the purchase order specifief a minus tolerance for wall thickness smaller than the applicable value given in this table, the plus tolerance for wall thickness shall be increased by an amount sufficient to maintain the applicable tolerance range.

b   for pipe with D ≥ 355,6 mm (14.000 in) and t ≥ 25,0 mm (0.984 in) the wall-thickness tolerance locally may exceed the plus tolerance for wall thickness by an additional 0,05 t, provided that the plus tolerance for mass (see 9.14) is not exceeded.

c   The plus tolerance for wall thickness does not apply to the weld area.

d   See 9.13.2 for additional restrictions.





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    精密钢管博客网:www.josen.net 于 2011-10-12 13:12:39 回复
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