Pressure Testing & Commissioning Flashcards
7 cards from real SPED practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pressure Testing & Commissioning flashcards as text
For Category M fluid service (highly toxic) under ASME B31.3, what is the required hydrostatic test pressure multiplier?
Answer: 1.5×
Category M fluid service still requires 1.5× design pressure for hydrostatic testing, but additional leak test requirements and precautions apply.
What risk does thermal expansion of trapped hydrostatic test water pose during post-test warm-up of a cold system?
Answer: Over-pressurization if vents are blocked
Water expands significantly when heated; if it is trapped in a closed section after testing, thermal expansion can generate pressures far exceeding design limits.
Which commissioning document formally transfers care, custody, and control of a piping system from construction to the operating company?
Answer: Turnover package
A turnover package (or handover package) is the formal document set—including P&IDs, test records, and certificates—that transfers responsibility to the operating team.
In a piping test pack, what does the term 'test boundary' refer to?
Answer: The physical limits of pipe segments to be pressure tested together
A test boundary defines which pipe segments, valves, and fittings are included in a single pressure test event, isolated from adjacent systems.
What is the significance of the 'AT' (as tested) P&ID mark-up during pressure testing activities?
Answer: Identifies lines that have passed acceptance
AT mark-ups on P&IDs track which lines, segments, or systems have successfully completed pressure testing, providing a visual record of test completion status.
During initial pressurization in a hydrostatic test, at what percentage of test pressure should a hold typically occur to allow visual inspection before reaching full test pressure?
Answer: 50%
Good practice requires a hold at approximately 50% of test pressure for an initial visual inspection to detect any obvious leaks before proceeding to full test pressure.
Which regulatory standard governs pressure testing requirements for high-pressure gas transmission pipelines in the United States?
Answer: 49 CFR Part 192
49 CFR Part 192 is the federal regulation governing transportation of natural gas and other gas by pipeline, including mandatory pressure testing requirements.