International Organization for Standardization

Seamless and Welded (Except Submerged Arc-Welded) Steel Tubes for Pressure Purposes - Ultrasonic Testing for the Detection of Laminar Imperfections - First Edition
 N 10124

Annotation

This International Standard specifies requirements for ultrasonic testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of laminar imperfections, according to four different acceptance levels. The acceptance level B1 is applicable only to seamless tubes intended for certain critical applications such as steam headers (see table 1).

NOTE 1  In the case of welded (except submerged arc-welded) tubes, an alternative ultrasonic testing specification is available for the detection of laminar imperfections, by ultrasonic testing of the steel strip prior to tube forming in accordance with ISO 12094.

This International Standard covers the inspection of tubes with an outside diameter greater than 30 mm. No lower limit of wall thickness is specified, but see note 2.

NOTE 2  For wall thicknesses less than 5 mm, difficulties can be experienced in detecting and sizing laminar imperfections by this method. When such difficulties arise, agreement between the purchaser and manufacturer is required to determine the testing technique to be adopted together with the laminar imperfection sizing method.

Автоматический перевод:

Безшовных и сваренных (за исключением погруженного в воду полученного дуговой сваркой) стальные трубы для напорных баков и оборудования - ультразвукового контроля для обнаружения Ламинарных дефектов - первое издание