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

Risk of water contamination in the pipe system

Answer

Increased corrosion of pipe materials

Answer

Inaccurate pressure gauge readings

Question 2

What does the acronym NDE stand for in piping inspection?

Accepted Answer

Non-Destructive Examination

Answer

Normal Diagnostic Evaluation

Answer

Non-Dimensional Engineering

Answer

New Defect Evaluation

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 B31.1 (Power Piping)

Answer

ASME B31.4 (Pipeline Transportation)

Answer

ASME Section VIII (Pressure Vessels)

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

Strength tests detect micro-leaks; leak tests verify structural integrity

Answer

Both tests serve the same purpose at different pressures

Answer

Strength tests apply only to welds; leak tests apply only to flanges

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

Radiographic testing (RT)

Answer

Ultrasonic thickness measurement (UTM)

Answer

Eddy current testing (ET)

Question 6

Under ASME B31.3, what minimum metal temperature margin above the minimum design metal temperature (MDMT) must be maintained during hydrostatic testing?

Accepted Answer

10°F (6°C) above the MDMT

Answer

5°F (3°C) above the MDMT

Answer

20°F (11°C) above the MDMT

Answer

No temperature margin is required for hydrostatic testing

Question 7

Which NDE method uses electromagnetic induction to detect surface and near-surface defects and is particularly suitable for non-ferromagnetic materials such as aluminum and austenitic stainless steel?

Accepted Answer

Eddy current testing (ET)

Answer

Magnetic particle testing (MT)

Answer

Radiographic testing (RT)

Answer

Ultrasonic testing (UT)