Pipefitter Pipe Testing and Inspection 2

Question 1

Which NDE method is best suited for detecting surface and near-surface defects in ferromagnetic pipe materials?

Accepted Answer

Magnetic particle testing (MT)

Answer

Magnetic particle testing induces a magnetic field in ferromagnetic material; disruptions caused by surface or near-surface flaws cause iron particles to cluster and reveal the defect.

Question 2

What does the abbreviation PMI stand for in the context of pipe inspection?

Accepted Answer

Positive Material Identification

Answer

Positive Material Identification (PMI) verifies through chemical analysis that the correct alloy material was actually installed in the piping system.

Question 3

Which NDE method applies a colored or fluorescent dye to a surface, allows it to seep into defects, then draws it out with a developer for examination?

Accepted Answer

Liquid penetrant testing (PT)

Answer

Liquid penetrant testing uses capillary action to draw dye into surface-breaking defects; the developer then pulls the trapped dye back out, making the defect visible.

Question 4

What must be done with pressure relief valves in a piping system before performing a hydrostatic pressure test?

Accepted Answer

Remove or isolate them from the test circuit

Answer

Relief valves must be removed or isolated because their set pressure is typically at or near the design pressure, and they would open before the required test pressure is reached.

Question 5

What is the primary purpose of visual testing (VT) in piping inspection?

Accepted Answer

To identify surface defects, misalignment, and improper installation

Answer

Visual testing is the most fundamental NDE method and is used to identify visible surface defects, improper weld profiles, misalignment, and installation non-conformances.

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Pipefitter Pipe Testing and Inspection 2