Liquid Penetrant Testing Procedure. 1.1 this written procedure establishes the method by which the relative sensitivity of penetrant materials arechecked. Each of the various methods has been designed for specific uses such as critical service items, volume of parts, portability or localised areas of examination.
The technician needs to wait for 5 to 15 minutes depends on test procedure. The testing surface must be free from foreign materials like dust, dirt, rust or paints that will block the open discontinuities The stage in the manufacturing process where liquid penetrant inspection is performed should be specified on the engineering drawing or in the referencing document.