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Technical Discussions
Nirav Dave
NDT Inspector,
Company, India, Joined Jul 2014, 11

Nirav Dave

NDT Inspector,
Joined Jul 2014
11:36 Nov-15-2014
NDE Equipmet


I am looking for a UT immersion test system for stainless steel seamless pipes. in conventional immersion generally A-Scan display along with UT charts are covered. now new UT system provide C-Scan facility and A-Scan display for a certain period of time.

i want to know weather ASME code accept C-scan display ?in which form UT charts shall appear? is it acceptable B-Scan or C-Scan for pipe / tube testing?

Plz advice.


Godfrey Hands
PRI Nadcap, United Kingdom, Joined Nov 1998, 307

Godfrey Hands

PRI Nadcap,
United Kingdom,
Joined Nov 1998
08:39 Nov-17-2014
Re: NDE Equipmet
In Reply to Nirav Dave at 11:36 Nov-15-2014 (Opening).

Hi Nirav,

There are different equipment options available from many different manufacturers. These range from the very simple to fully automated.
The very simplest set-up is to rotate a tube in a helix past a 45 degree angle contact probe with water dripped in to the contact area to detect longitudinal defects. This only looks in one direction, so adding a second probe looking the other way increases this to bi-directional.

Next up in performance is to use immersion probes, again with the tube being rotated in a helix. The machine can incorporate several probes to provide detection of longitudinal and circumferential defects as well as wall thickness. This set-upp is generally used in small to large diameter tubes (15mm and larger).

Next comes the rotating probe set-up, which has a similar set-up to last one above, but tends to test faster and on smaller diameters (up to about 25mm diameter).

It is not normal to use any of these with C-Scan, but chart recording, usually with one chart for each probe provide all the information which you will need.
C-Scan is unlikely to provide much more information than chart recording for smaller diameter tubes.
It may also not provide much benefit recording B-Scan, especially on smaller wall thicknesses.

Also in reply to your other enquiry about ROTA, I agree with Ed Ginzel. For detection of Longitudinal defects, it is best if you initially use a fixed offset from perpendicular, related to the tube diameter. Simple geometry will show you the correct offset to use.
This is valid for rotating tubes as well as rotating heads

Godfrey Hands


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