Quality Control Procedures Flashcards

What is the purpose of a traveler or work package in piping fabrication QC?

Answer: To document each step of fabrication with sign-offs

A traveler documents each fabrication step—fit-up, welding, NDE, PWHT, testing—with dated signatures to maintain quality traceability.

During post-weld heat treatment (PWHT), the thermocouple reading drops below the minimum soak temperature for 5 minutes. What must occur?

Answer: Restart the soak cycle from the beginning

If the temperature falls below the specified minimum soak temperature, the soak time must restart from zero to ensure proper stress relief.

Which piping code governs quality control requirements for power plant steam piping?

Answer: ASME B31.1

ASME B31.1, Power Piping, covers quality requirements for steam and power plant piping systems.

A welder's qualification test coupon fails bend testing. What is the immediate consequence?

Answer: All production welds made by that welder since the last successful test are subject to review

A failed qualification test calls into question the welder's recent production welds, which must be reviewed and potentially re-examined.

What is the acceptable porosity limit for a single circular pore in a groove weld under ASME B31.1?

Answer: Not to exceed 3/32 inch diameter

ASME B31.1 limits individual circular porosity to 3/32 inch maximum diameter for groove welds.

What does the term 'NCR' stand for in a piping QC program?

Answer: Non-Conformance Report

NCR stands for Non-Conformance Report, used to document any material, weld, or installation that does not meet specified requirements.

When reviewing a piping isometric drawing for QC, what does a 'hold point' symbol indicate?

Answer: A point where work must stop and inspection approval is required before proceeding

A hold point requires mandatory QC or third-party inspection and written sign-off before the next work phase can begin.