Dear Mr. Pradeep,
The statement is essentially correct. It is not a present Section V requirement but, it was in the earlier editions and is still preserved through
cross-references in other ASME sections. The controlling clause is: ASME Section V– Article 9 (T-952 or T-953, depending on the edition).
Typical wording is edition-dependent and wording shift slightly between editions, which is why you may not see the exact sentence you
quoted in your copy.
· Viewing distance: The VT shall be conducted at a distance not greater than 24 in. (600 mm)
· Lighting: Illumination shall be sufficient to provide a minimum of 15 foot-candles (≈160 lux) for general examination and 50 foot-candles
(≈540 lux) for the detection of small discontinuities.
Later editions of Section V streamlined Article 9, removing some descriptive text. The same technical requirements are now referenced
rather than repeated. Many construction codes restate the VT requirements directly. As a result, clients often quote VT requirements from:
· Older Section V editions
· Construction codes (Section VIII, IX, B31, etc.)
· Employer/Owner VT procedures derived from Article 9.
For example, ISO 17637 explicitly states:
· Viewing distance ≤ 600 mm
· Minimum illumination:
160 lux (~15 fc) general
500 lux (~50 fc) for fine indications
This is why many VT procedures include exactly your quoted values.
Best way to cite it in a procedure is:
Visual examination shall be performed in accordance with ASME Section V, Article 9. Illumination and viewing conditions shall comply with
the requirements referenced therein (minimum 15 fc for general examination; 50 fc for detection of small discontinuities, and viewing distance
not exceeding 600 mm).
Trust it is clear.
rgds,
C Sridhar.
--Dear expert,please review the screenshot above. Is it correct? If so, could someone please provide a reference? Article 9 of ASME Section V does not mention this. Can anyone confirm?With regardsPradeep
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