PMI acceptance criteria

Date 04-05-2008 05:21

With regards to Positive Material Identification (PMI) inspections, ASME section II A/B/C shows the chemical composition value of an alloying element which states the minimum and maximum values permitted.

For example Chromium requirements as per ASME sect. II A/B/C is 19.5-22.0 for ER 308 electrode. Project specification's acceptance criterion allows the chromium requirements minimum of 17.55 and maximum of 24.00.

Is it possible to override the requirements of ASME section II if the project specification we undertake requires additional ± 10% of the amount specified on the standard?

By CWI555

Date 04-05-2008 21:29

Before you go any further, I'd make sure the specification you quoted is not a typo. If it is not, then check with the people who wrote the spec. to assure it was intended to be those numbers. If that is the case, then your spec is an engineering document, you've chased it as far as you need to chase it.

However; I'd be very much surprised if you could find any stamped er308 that didn't meet the ASME requirements.

regards,
Gerald