Our UKAS accredited service provides certification of compliance for Reference Master gauges to American Petroleum Institute (API) Specifications. Under a EURAMET agreement, traceability for API gauges throughout Europe has been devolved to NPL who are the sole agency in Europe authorised by API to certify reference master screw gauges. NPL also provides calibration services for VAM specification gauges.
API regional masters
Approved Regional Master gauges held by NPL are as follows:
* Regular left-hand (Reg LH) gauges have been temporarily withdrawn from service
NPL provides certification of compliance for Reference Master gauges to the following API Specifications - 5B Casing, Tubing and Line Pipe threads, 7 Rotary Drilling Equipment and 11B Sucker Rods.
VAM master thread gauges
Calibration of VAM gauges are available on request.
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