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| Non-destructive tests |
NON-DESTRUCTIVE TESTS
Ultrasonic Testing ASTM-E213, Eddy-Current Testing acc. to ASTM-E426 / SEP1925
This involves inducing eddy currents into the material by exciting a coil which surmounts two narrow search coils surrounding the material.Any discontinuities in material are found by comparing the electrical conditions that exist in the two search coils. The fault signals areamplified and can be shown on a cathode ray tubes (pipes) or as an audible signal.
Hydrostatic Test
This is used to test the manufactured items under a test pressure equivalent or greater than pressure encountered in operation. It involvesfilling the tubes (pipes) with demineralized water, which cannot be compressed, and increasing the pressure, to that specified, inside the tube. Thepressure is transmitted to the tubes (pipes) by the water and therefore a pressure to which the tubes (pipes) has been tested is obtained.
PMI ( positive material identification) - Mix-Up Control
PMI / Mix-Up Control is carried out by spectrotest. Spectrotest is used for "Mix-Up Control" work, testing of a material quality is carried out ona Yes / No basis in relation to the quality of the reference material.The operator is prompted to "Recalibrate", "Test the reference material" and " Carry out mix-up control" by the instrument.
Microstructure test according toASTM E 112 / DIN 50601.
These test methods of determination of average grain size in metallicmaterials are primarily measuring procedures and, because of their purelygeometric basis, are independent of the metal or alloy concerned. Thebasis procedures may also be used for the estimation of average grain,crystal or cell size in nonmetallic materials. The comparison method byplanimetric (or Jeffries) procedure is used if the structure to the materialapproaches the appearance of one of the standard comparison charts. |
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