Steamfitter Quality Control Procedures 2 — Questions and Answers
Question 1: Which document must be completed before a hydrostatic pressure test can begin on a steam piping system?
- Material test report
- Pre-test inspection checklist (Correct answer)
- Welding procedure specification
- As-built drawing
Correct answer: Pre-test inspection checklist
A pre-test inspection checklist must be completed to confirm all joints are accessible, gauges are calibrated, and isolation is in place before pressurizing.
Question 2: What is the minimum hold time for a hydrostatic leak test on a high-pressure steam system per ASME B31.1?
- 10 minutes (Correct answer)
- 20 minutes
- 30 minutes
- 60 minutes
Correct answer: 10 minutes
ASME B31.1 requires a minimum hold time of 10 minutes at the test pressure before inspection begins.
Question 3: During a visual weld inspection, what condition in a fillet weld would require immediate rejection?
- Slight surface discoloration
- Undercut exceeding 1/32 inch (Correct answer)
- Minor spatter on base metal
- Slightly uneven leg length within tolerance
Correct answer: Undercut exceeding 1/32 inch
Undercut exceeding 1/32 inch weakens the base metal at the weld toe and is a rejectable condition per AWS and ASME standards.
Question 4: What does MTR stand for in piping quality control?
- Maximum Test Rating
- Material Test Report (Correct answer)
- Mechanical Tolerance Record
- Manufacturing Traceability Register
Correct answer: Material Test Report
MTR stands for Material Test Report, which certifies the chemical composition and mechanical properties of piping materials.
Question 5: A pipe spool is found to have a heat number that does not match its MTR. What is the correct action?
- Proceed if the material looks correct
- Quarantine and notify the QC manager (Correct answer)
- Re-stamp the heat number
- Use it only for low-pressure lines
Correct answer: Quarantine and notify the QC manager
Unverified material must be quarantined and reported to QC management to maintain full material traceability.
Question 6: Which NDE method is best suited for detecting subsurface cracks in a carbon steel weld?
- Liquid penetrant testing (PT)
- Magnetic particle testing (MT)
- Radiographic testing (RT) (Correct answer)
- Visual testing (VT)
Correct answer: Radiographic testing (RT)
Radiographic testing (RT) uses X-rays or gamma rays to detect internal and subsurface weld discontinuities.
Question 7: What is the purpose of a weld map in a QC package?
- To calculate weld filler material quantities
- To identify the location and welder ID for each weld (Correct answer)
- To show pipe support spacing
- To record pressure test results
Correct answer: To identify the location and welder ID for each weld
A weld map cross-references each weld joint to the welder who performed it, enabling traceability for inspection and repair.
Steamfitter Quality Control Procedures 2
Which document must be completed before a hydrostatic pressure test can begin on a steam piping system?