API Quality Control and Materials 2 — Questions and Answers
Question 1: According to API standards, what is the primary purpose of a Material Test Report (MTR)?
- To document shipping logistics
- To certify that material properties meet specified requirements (Correct answer)
- To record maintenance history
- To track inventory levels
Correct answer: To certify that material properties meet specified requirements
An MTR certifies that the material's chemical composition and mechanical properties conform to the applicable specification.
Question 2: What destructive test is used to evaluate the ductility and soundness of a weld by bending a specimen to reveal cracks or discontinuities?
- Charpy impact test
- Guided bend test (Correct answer)
- Hardness test
- Tensile test
Correct answer: Guided bend test
The guided bend test bends weld specimens around a mandrel to detect surface or subsurface flaws indicating lack of fusion or ductility.
Question 3: Which API standard governs the specification for line pipe used in oil and gas pipelines?
- API Spec 5L (Correct answer)
- API Spec 6D
- API RP 574
- API Spec 12F
Correct answer: API Spec 5L
API Spec 5L covers seamless and welded steel line pipe for the transportation of gas, water, and oil.
Question 4: During incoming material inspection, a QC inspector finds that a pipe's actual wall thickness is below the minimum specified. What is the correct action?
- Accept it if within 10% of minimum
- Place the material on hold and generate a nonconformance report (Correct answer)
- Reject it immediately without documentation
- Use it in a low-pressure application
Correct answer: Place the material on hold and generate a nonconformance report
Nonconforming material must be segregated, tagged, and documented via an NCR before any disposition decision is made.
Question 5: What does the term 'heat number' refer to in materials traceability?
- The temperature at which material was shipped
- A unique identifier assigned to a batch of steel from a single melt (Correct answer)
- The hardness rating of the alloy
- The maximum service temperature of the pipe
Correct answer: A unique identifier assigned to a batch of steel from a single melt
A heat number uniquely identifies a specific melt of steel, enabling traceability back to the original MTR and mill test data.
Question 6: In API quality systems, what is a 'hold point' in an inspection and test plan (ITP)?
- A pause in production due to equipment failure
- A mandatory stop requiring QC or client witness before work proceeds (Correct answer)
- A temporary storage area for materials
- A documentation checkpoint after work is complete
Correct answer: A mandatory stop requiring QC or client witness before work proceeds
A hold point requires work to stop until the designated inspector or client witness approves before the next step begins.
Question 7: Which mechanical property is measured by the Charpy V-notch impact test?
- Tensile strength
- Hardness
- Notch toughness (impact energy) (Correct answer)
- Yield strength
Correct answer: Notch toughness (impact energy)
The Charpy V-notch test measures the energy absorbed by a material when fractured under impact, indicating notch toughness.
API Quality Control and Materials 2
According to API standards, what is the primary purpose of a Material Test Report (MTR)?