API 577 (Welding Inspection and Metallurgy)

Question 0

API 577

A calibration block must be within what temperature of the part to be examined (UT Calibration)?

Answer 0

API 577 (9) Non-destructive Examination
(9.9) ULTRASONIC INSPECTION (UT)
(9.9.1) Ultrasonic Inspection System Calibration
25 degrees F
Calibration system checks should be performed prior to and at the completion of an examination. In addition, a system check is required with any change in the search unit, cabling, and examiner. The temperature of the calibration standard should be within 25°F (14°C) of the part to be exam- ined. If the temperature falls out of that range, the reference standard is brought to within 25°F (14°C), and a calibration check should be performed. For high temperature work, special high temperature transducers and couplants are usually necessary. Consideration should be given to the fact that tem- perature variations within the wedge or delay line can cause beam angle changes and/or alter the delay on the time base. System checks are typically performed at a minimum of every four hours during the process of examination but can be done more often at the examiners discretion, when malfunc- tioning is suspected.
If during a system calibration check, it is determined that the ultrasonic equipment is not functioning properly, all areas tested since the last successful calibration should be reexamined.

Question 1

API 577

What is the distance of eye-to-part to count as a visual exam (NDE)?

Answer 1

API 577 (9) Non-destructive Examination

(9. 3) VISUAL EXAMINATION (VT)
(9. 3.1) General
(9. 3.1.e) 6”-24” Direct visual examination requires access to permit the eye to be within 6 in. – 24 in. (150 mm – 600 mm) of the surface, at an angle not less than 30 degrees.