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Technical Discussions
Robert Howland
Canada, Joined Sep 2013, 11

Robert Howland

Joined Sep 2013
22:10 Jul-13-2020
CSA Z662 Contradiction

Can anyone clarify... / 2 Specify using ASME V art 4 T-471... then in it specifies ASME T-472

Is there a specific difference between “Circumferential butts welds” and “ Production welds”?

7.15 Arc and gas welding — Ultrasonic inspection of circumferential butt welds in piping Ultrasonic inspection shall be performed in accordance with a documented procedure approved by the
company. Such a procedure shall include the applicable information listed in Paragraph T-421 of the
ASME Boiler and Pressure Vessel Code, Section V, Article 4, The complete volume of weld metal and HAZ in the weld shall be inspected. Inspection requirements
shall be as specified in Paragraph T-471 of the ASME Boiler and Pressure Vessel Code, Section V, Article
4, except that the entire weld may be inspected using an array of search units operating in pulse-echo
or tandem mode, each designed to inspect specific parts of the required inspection volume.

7.15.7 Calibration Except as required by Clause, the calibration block and reflectors shall be as specified in
Paragraph T-434 of the ASME Boiler and Pressure Vessel Code, Section V, Article 4.

7.15.8 Inspection procedure for production welds
Except as allowed by Clause, the inspection of production welds shall be performed as specified
in Paragraph T-472 of the ASME Boiler and Pressure Vessel Code, Section V, Article 4.
Except where the calibration block required by Clause (Annex K) is used, the reference reflector shall bethe 2.4 mm diameter side-drilled hole in the calibration block (see Clause

Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Edward Ginzel

R & D, -
Materials Research Institute,
Joined Nov 1998
23:33 Jul-13-2020
Re: CSA Z662 Contradiction
In Reply to Robert Howland at 22:10 Jul-13-2020 (Opening).

Robert, it has been many years since I used Z662. Z662 was introduced around the time that automated UT was being common-place in Canada. We considered "Production Welds" to be those welds that were made to join pipe-to-pipe. For mainline work, this process was a production-type operation with automatic welding shacks and the automated UT was expected to keep pace with production and act as a process control (as well as quality control). Using the old multi-probe arrays meant that the rules for manual UT had to be re-written (e.g. the overlap in raster scanning did not apply) and the calibration block was no longer based on a DAC using side drilled holes but was instead configured to contain flat bottom holes at specified angles and depths.

Of course "circumferential welds" were also seen on the pipeline. Pipe to valves, pipe to fittings, components inside the compressor buildings like the pulsation bottles...all had circ welds that were not suitable for automated welding. These were permitted to be tested using manual UT techniques such as were described in ASME V Art. 4.

The reference to ASME V Art T-471 makes reference to General Examination Requirements including the probe motion (intended to manual UT) and gain settings.
T-472 is describing the calibration block. Z662 is not contradictory in this aspect. It is stating that if you are not using the Annex K (zonal) block, then use the ASME Basic block, but the size of the SDH shall be 2.4mm diameter (whereas in ASME the size of the hole varies depending on the wall thickness).

If you have more questions you can contact me directly.


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