I have given swage concentric nipple 1/2 x 1/4 inches to third party inspection for inspection. We need thickness measurement by pulse echo method as per E797, but inspection agency & the stockiest are saying that they will use dial caliper (which has a least count of 0.05 mm) instead of pulse echo method to measure the thickness. As per them, pulse echo method cannot be done on the finished products because of the roughness of the surfaces, different angles & radian which are naturally occurring in the nipples mentioned above. AS PER THEM, PULSE ECHO METHOD E797 IS SUITABLE FOR FLAT FITTINGS ONLY.
I request suggestions
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