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Technical Discussions
saroj thapa
saroj thapa
05:59 Apr-11-2019
use of reference block.

when i have to inspect piping joint by paut at that time i need to draw TCG. can i draw a TCG using flat block? if i replace wedge does it affect my inspection?

William A Jensen
IHI Southwest Technologies, Inc., USA, Joined May 2017, 64

William A Jensen

IHI Southwest Technologies, Inc.,
Joined May 2017
13:36 Apr-11-2019
Re: use of reference block.
In Reply to saroj thapa at 05:59 Apr-11-2019 (Opening).

The requirement for curved versus flat calibration blocks would be contained within the applicable Code or Standard that you are using for your examination. ASME Section V states:

T-434.1.7 Block Curvature.
T-434.1.7.1 Materials With Diameters Greater
Than 20 in. (500 mm). For examinations in materials
where the examination surface diameter is greater than
20 in. (500 mm), a block of essentially the same curvature,
or alternatively, a flat basic calibration block, may
be used.
T-434.1.7.2 Materials With Diameters 20 in.
(500 mm) and Less. For examinations in materials where
the examination surface diameter is equal to or less than
20 in. (500 mm), a curved block shall be used. Except
where otherwise stated in this Article, a single curved basic
calibration block may be used for examinations in the
range of curvature from 0.9 to 1.5 times the basic calibration
block diameter. For example, an 8 in. (200 mm) diameter
block may be used to calibrate for examinations on
surfaces in the range of curvature from 7.2 in. to 12 in.
(180 mm to 300 mm) in diameter. The curvature range
from 0.94 in. to 20 in. (24 mm to 500 mm) in diameter requires
six curved blocks as shown in Figure T-434.1.7.2
for any thickness range.


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