Pipe Category

Pipe Size mm

Allowed Tolerances

Standard

Higher

Hot Rolled

OD

≤ 159

± 1.0% (± 0.5mm )

± 0.75% (± 0.3mm )

> 159

± 1.0%

± 0.90%

WT

< 3.5

+ 15% (+ 0.48mm

- 10% - 0.32mm )

± 10% (± 0.2mm )

3.5~20

+15%
-10%

±10%

>20

D <  219

± 10%

±7.5%

D ≥ 219

+12.5%
-10.0%

±10%

Cold Drawn

OD

≤ 30

± 0.20mm

± 0.15mm

> 30~50

± 0.30mm

± 0.25mm

>50

±0.8%

±0.6%

WT

2~3

+12%
-10%

±10%

> 3

±10%

±7.5%