Pipefitter Pipe Testing and Inspection 3

Question 1

What is the primary hazard that makes pneumatic pressure testing more dangerous than hydrostatic testing?

Accepted Answer

Greater stored energy in compressed gas that can cause explosive failure

Answer

Compressed gas stores significantly more potential energy than liquid at the same pressure; a failure during pneumatic testing can release this energy explosively.

Question 2

What does the acronym NDE stand for in piping inspection?

Accepted Answer

Non-Destructive Examination

Answer

Non-Destructive Examination (NDE) refers to inspection techniques that evaluate the integrity of materials or components without causing damage or rendering them unfit for service.

Question 3

Which ASME code specifically governs the design, fabrication, inspection, and testing of process piping systems in refineries and chemical plants?

Accepted Answer

ASME B31.3 (Process Piping)

Answer

ASME B31.3, the Process Piping code, covers all requirements for piping typically found in petroleum refineries, chemical plants, and similar process facilities.

Question 4

What is the key difference between a strength test and a leak test in piping systems?

Accepted Answer

Strength tests verify the system can withstand design pressure without failure; leak tests verify joints are properly sealed

Answer

A strength test (typically hydrostatic) confirms the piping system can safely withstand its required pressure, while a leak test specifically checks that all joints, connections, and seals are tight.

Question 5

Which in-service inspection method uses a magnetic field to detect pipe wall loss and corrosion without removing insulation or coatings?

Accepted Answer

Magnetic flux leakage (MFL)

Answer

Magnetic flux leakage saturates the pipe wall with a magnetic field; areas of wall loss or corrosion disrupt the field, allowing detection through non-metallic coatings and insulation.

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Pipefitter Pipe Testing and Inspection 3