ISO 10893-1:2011 pdf download.Non-destructive testing of steel tubes —Part 1: Automated electromagnetic testing of seamless and welded(except submerged arc-welded) steel tubes for the verification of hydraulic leaktightness.
b) a reference longitudinal notch, as defined in 6.4 and 6.6.2, when using one of the following techniques:1) fixed or rotating probe/pancake coil eddy current technique;
2fixed or rotating magnetic transducer flux leakage technique.
c) a reference transverse notch, as defined in 6.5 and 6.6.2, when using the multiple concentric magnetictransducer flux leakage technique;
d) by agreement between the purchaser and manufacturer, the reference holes suggested in Table 1 may alsobe used when flux leakage inspection technique is performed.
NOTE1 For eddy current testing, concentric coil segment coil fixed or rotating probe/pancake coil ther types of relference standardwhich shows the same characteristics can be used by agreement between the purchaser and manufacturer.
NOTE 2 In special cases, for example testing hot tubes or using equipment contained within a continuous tube mill, a modifiedcalibration or calibration checking procedure can be used, by agreement. Also by agreement,internal longitudinal or transversenotches can be additionally used during flux leakage inspection of pipes having wall thickness lower than 12,7 mm.
6.1.4 The reference standards (see 6.2 to 6.5) shall be sufficiently separated longitudinally (in the case ofreference holes) and from the ends of the reference tube such that clearly distinguishable signal indications areobtained.
