Safety Procedures and Codes Flashcards
6 cards from real PIPEFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Safety Procedures and Codes flashcards as text
Under OSHA's Process Safety Management (PSM) standard (29 CFR 1910.119), what type of facility is subject to PSM requirements?
Answer: Facilities that handle highly hazardous chemicals above threshold quantities defined in Appendix A
OSHA PSM (29 CFR 1910.119) applies to facilities that handle, use, store, or produce highly hazardous chemicals in quantities at or above the threshold quantities listed in Appendix A.
What is the minimum air quality requirement for 'safe for entry' into a confined space for oxygen content per OSHA 1910.146?
Answer: 19.5% to 23.5%
OSHA 1910.146 defines an acceptable atmosphere in a permit-required confined space as having an oxygen concentration between 19.5 percent and 23.5 percent. Below 19.5 percent is oxygen-deficient; above 23.5 percent is oxygen-enriched (increased fire risk).
What does ASME B31.3 require for a 'Category D' fluid service piping system regarding leak testing?
Answer: Initial service leak test (system may be inspected during first pressurization to operating conditions)
ASME B31.3 Category D fluid service (non-flammable, non-toxic fluid at design pressure 150 psi or less and temperature between -20 and 366 degrees F) permits an initial service leak test rather than requiring a pre-service hydrostatic test.
Under OSHA's hot work permit system, which actions are required BEFORE beginning torch cutting on a pipe in an active refinery?
Answer: Obtain a written hot work permit signed by a responsible individual, verify the area is cleared of flammables, and have a fire watch in place
OSHA 1910.252(a) and PSM require a written hot work permit for any arc welding, cutting, or grinding that could ignite a fire in hazardous locations, with the permit signed by an authorized person, the area cleared of flammables, and a trained fire watch stationed.
What is the purpose of a 'line break permit' when a pipefitter must open an existing in-service piping system?
Answer: A controlled work authorization that verifies the line is properly isolated, de-pressured, drained, and safe to open before breaking into any piping
A line break permit (also called a line opening permit) is a work authorization that confirms the piping has been properly isolated, de-pressured, drained or purged, and is safe to open, protecting workers from hazardous fluid or gas release.
What is the purpose of a pressure relief valve (PRV) in a piping system, and what code governs its sizing for pressure vessels?
Answer: It protects equipment and piping from overpressure by opening to discharge excess pressure; vessels sized per ASME Section VIII, process relief per API 520/521
A pressure relief valve (PRV) is a safety device that automatically opens when system pressure exceeds the set pressure, discharging fluid to protect the piping and equipment from overpressure failure. For pressure vessels, sizing is governed by ASME Section VIII; API 520/521 cover process relief system design.