What are the methods of ultrasonic testing in surge tank nondestructive testing?

Ultrasonic testing of surge tank includes diffraction time difference ultrasonic testing (TOFD), recordable pulse reflection ultrasound and non-recordable pulse reflection ultrasound.

The conditions for compliance with surge tank for hydraulic tests

(1) No leakage;

(2) No visible deformation;

(3) No abnormal sound during the test.