AS ISO 3452.6:2020 Non-destructive testing – – Penetrant testing Part 6: Penetrant testing at temperatures lower than 10 °c.
This part of Iso 3452 specifies the testing requirements particular to applications at low temperatures (lower than + 10 °C) as well as the method for qualification of suitable testing products. It applies only to materials qualified for the relevant temperature range used in accordance with the manufacturer’s instructions.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3059, Non-destructive testing — Penetrant testing and magnetic particle testing — Viewing conditions ISO 3452-1, Non destructive testing — Penetrant testing — Part 1: General principles
ISO 3452-2, Non-destructive testing — Penet rant testing — Part 2:Testing of penetrant materials ISO 3 452-3, Non-destructive testing — Penetrant testing — Part 3: Reference test blocks
3 Low temperature penetrant testing
3.1 General principles
The general principles of ISO 3452-1 shall apply unless otherwise stated in this part of ISO 3452 or in the manufacturer’s instructions.
Qualification tests are carried out by the manufacturer and if products are used within the stated range, no further tests are needed on site.
3.2 Technical principles
Depending on the temperature range, some specific problems might be encountered:
a) moisture, or even ice, on the test object;
b) lower evaporation rate of solvents and of non-aqueous wet developers than at higher temperatures;
c) when spray cans are used, pressure and spray quality may be affected;
d) some penetrants may precipitate. In such a case, tests shall be carried out within the standard temperature range (10 °C to 50°C) if the penetrants are to be used in the working temperature range.
3.3 Safety precautions
All relevant European, national and local regulations pertaining to health and safety, environmental requirements etc. shall be observed.
Depending on the temperature range, some specific rules shall be enforced:
a) when heaters are used (either to warm up the test object, materials or the work environment), precautions shall be taken not to have vapours or spray of materials in contact with flames or hot surfaces;
b) users shall wear clothes and gloves able to protect them from contact with very low temperature parts. Gloves used shall allow for applying materials without impairing the test;
c) in very low temperature environment, some pieces of equipment (pens, cameras, etc.) may not properly work. Action shall be taken, either to keep them at an acceptable temperature until use (for instance by keeping them under clothing, close to the user’s body) or by using equipment capable of functioning in such an environment.
3.4 Reference blocks/test panels
Care shall be taken while using reference block/test panels. It could be tempting to put these panels in a freezer, and to take them out when they have reached the targeted temperature for testing materials. Doing so places cold parts in contact with a warmer atmosphere, causing moisture to condense on these parts and the temperature to rise very quickly.
AS ISO 3452.6 pdf download.