Mandrel testing is required for pipes of which diameter?

Mandrel testing is required for pipes of which diameter?

• A. Less than 27 inches
• B. 27 inches
• C. Greater than 40 inches
• D. All pipes require mandrel testing

Answer: (A)

Mandrel testing checks that the pipe bore stays within acceptable diameter tolerances and is free of internal deformations by trying to pass a mandrel through it. This test is practical and cost-effective for smaller pipes, ensuring smooth interior surfaces and reliable flow. Pipes with diameters under 27 inches are the ones specified to require mandrel testing because the mandrel can be sized appropriately and the test is feasible at that scale. For larger pipes, mandrel testing becomes impractical or is replaced by other inspection methods, so the requirement doesn’t apply in the same way. So, mandrel testing is required for pipes with diameters less than 27 inches.

Mandrel testing checks that the pipe bore stays within acceptable diameter tolerances and is free of internal deformations by trying to pass a mandrel through it. This test is practical and cost-effective for smaller pipes, ensuring smooth interior surfaces and reliable flow.

Pipes with diameters under 27 inches are the ones specified to require mandrel testing because the mandrel can be sized appropriately and the test is feasible at that scale. For larger pipes, mandrel testing becomes impractical or is replaced by other inspection methods, so the requirement doesn’t apply in the same way.

So, mandrel testing is required for pipes with diameters less than 27 inches.