Core Responsibilities Flashcards

When a pipefitter discovers an unmarked underground utility line during excavation, what is the correct immediate action?

Answer: Stop work and notify the supervisor and utility owner

Work must stop immediately and the supervisor and utility owner must be notified to prevent damage or injury.

Which document governs the allowable pressure rating for a piping system in a given facility?

Answer: The piping specification or pipe class document

The piping specification or pipe class document defines materials, pressure ratings, and fittings allowed for each service.

A pipefitter is asked to install a branch connection on a high-pressure steam header. Which method is MOST appropriate for a full-strength connection?

Answer: Threadolet fitting welded to the header

A threadolet (or weldolet) provides a full-penetration weld and is rated for high-pressure branch connections.

What is the primary purpose of a hydrostatic pressure test on a newly installed piping system?

Answer: To verify the system holds pressure without leaks or failures

A hydrostatic test confirms the integrity of all welds, fittings, and joints by pressurizing the system above operating pressure.

Which OSHA standard primarily governs permit-required confined space entry for pipefitters?

Answer: 29 CFR 1910.146

29 CFR 1910.146 covers permit-required confined spaces, including atmospheric testing and entry procedures.

What does the term 'dead leg' refer to in a process piping system?

Answer: A pipe section with no flow that can accumulate contamination or stagnant fluid

A dead leg is a section of piping with no flow, which can lead to corrosion, contamination, or freezing in certain services.

Before beginning hot work (welding/cutting) on a piping system in a plant, a pipefitter must first obtain a:

Answer: Hot work permit signed by the area authority

A hot work permit ensures hazards are identified, combustibles are cleared, and fire watch is in place before ignition sources are introduced.