Mill tolerance as per ASME

[Rishabh Chandnani]

Mill tolerance for the seamless pipe is 12.50% and 0.3mm for the welded pipe.

Whereas Mill tolerance for the seamless/welded fitting & flange  is 12.50% 

Is standard more stringent in case of welded pipes ?

Please justify.

Regards

Rishabh

[Mhaskar Aly]

Tolerances are set based on manufacturing process.

Welded pipes, there is very less chance of thinning so is the tolerance. Cut from coil and rolled and welded.

Further 12.5% mill tolerance is considered while designing the item, and so thickness of pipe will be design thickness plus mill tolerance plus Corrosion allowance.

Mhaskar Ali 

Dubai 

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