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々 Non-destructive testing
△ The entire wall of test class 2 tubes with an outside diameter exceeding 101. 6 mm or a wall tickness exceeding 5.6 mm shall be subjected to an ultrasonic examination as described in Stahi-Eisen-Prufblattern 1915.
△ Tubes to be used for pressure vessel casings,designed for a permissible working overpressure exceeding 80 bar,shall be tested as spedified in Stahi-Eisen-Prufblattern 1915 and 1918.
△ Subject to agreement at the time of ordering,the entire wall of test class 2 tubes with an outside diameter not exceeding 101.6 mm or a wall thickness not exceeding 5.6 mm test class 1 tubes may also be subjected to an uitrasonic examination as described in Stahi-Eisen-Prufblattern 1915.
々 Dimensions,masses per unit length and permissible deviations
△ DIN 2462 Part 1 shall apply for the dimensions and masses per unit length of tubes and for permissible deviations.
△ DIN 28180 shall apply for tublar heat exchangers.The order shall follow the patten of the sample order given in that standard.
々 Physical properties
△ Reference is made to volume 10 of the Stahi-Eisen-Prufblattern berichte(Iron and steel special reports)(see the '' Standards and other documents referred to '' clause) for guideline data on the physical properties of the steels conforming to the requirements of this standard.
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