Preparing For Liquid Penetrant Testing

When conducting non-destructive testing (NDT), the focus is on identifying small flaws which can cause big problems. Preparation is an absolutely essential stage of the process and can have a big impact on the success of an inspection. If preparation is done properly, then the presence or absence of a flaw or defect can be significantly easier to identify. If preparation is not done correctly, then multiple tests might need to be performed which is inefficient and can be expensive. In this blog edition we inform you how to prepare for liquid penetrant testing in the construction, civil and manufacturing industries. Read on to discover why proper preparation is required before evaluating parts using liquid penetrant non-destructive testing.

When performing non-destructive testing, sometimes nothing more than a little cleaning of the component undergoing evaluation needs to be performed. With liquid penetrant testing, however, there are a few more considerations which need to be taken into account. Parts undergoing inspection need to be professionally cleaned, for example, with sandblasting equipment, to make sure that any surface defects are readily recognisable. Without this preparation, an unidentified crack in a component or structure could cause massive damage at great expense and even put lives in danger. Engineers using non-destructive testing techniques must ensure every part of the inspection is performed properly to ensure safety and efficiency for all assets.

Liquid penetrant testing involves applying a low-viscosity liquid to a clean part. Capillary action allows any excess liquid present to flow into flaws and inconsistencies in the part. After some time spent in situ, the excess penetrant is removed and the remaining penetrant will flow from the flaw, alerting the engineer conducting the test to its presence. The method is popular in the industries mentioned above because it is portable and applicable to most parts, regardless of their geometry or molecular composition. Even junior engineers are able to perform liquid penetrant non-destructive testing without any fear of causing damage to parts or incorrect application of the science.

Some of the disadvantages of liquid penetrant testing, however, are primarily related to the needs for significant cleaning before testing can be performed. Without a very clean part, liquid penetrant testing cannot be performed, and the cleanup required after liquid penetrant testing can also be taxing.

Contact NDT Australia

If you are looking for liquid penetrant non-destructive testing equipment, check out NDT Australia’s online store. We supply a range of NDT technology, including liquid penetrant testing equipment. We are open for business Monday to Friday, 7:30am to 4:00pm. Contact our friendly sales team on (02) 9524 0558 to ask any questions or to place an order for any of the products listed on our online store.