Quality Control and Materials Flashcards

According to API standards, what is the primary purpose of a Material Test Report (MTR)?

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.

What destructive test is used to evaluate the ductility and soundness of a weld by bending a specimen to reveal cracks or discontinuities?

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.

Which API standard governs the specification for line pipe used in oil and gas pipelines?

Answer: API Spec 5L

API Spec 5L covers seamless and welded steel line pipe for the transportation of gas, water, and oil.

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?

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.

What does the term 'heat number' refer to in materials traceability?

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.

In API quality systems, what is a 'hold point' in an inspection and test plan (ITP)?

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.

Which mechanical property is measured by the Charpy V-notch impact test?

Answer: Notch toughness (impact energy)

The Charpy V-notch test measures the energy absorbed by a material when fractured under impact, indicating notch toughness.