PIPEFITTER Cheat Sheet 2026

The 30 highest-yield PIPEFITTER facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is a common first step for an experienced pipefitter transitioning into a project estimator role? → Completing a construction estimating course or certificate program
2. What are typical work environments for pipefitters? → Construction Sites
3. A reducing socket-weld fitting is specified as '2" × 1½" SW'. When ordering, the pipefitter must verify that the fitting conforms to: → ASME B16.11, with bore dimensions checked against both pipe schedules involved
4. Which document provides written authorization to break into an energized or pressurized piping system and details all isolation steps? → Line Break Permit
5. What does the note 'SMLS' mean when written next to a pipe specification on a drawing? → Seamless pipe (no longitudinal weld seam)
6. A concentric reducer connects pipes of different sizes and is distinguished from an eccentric reducer because it: → Has both centerlines aligned on the same axis
7. What does the acronym NDE stand for in piping inspection? → Non-Destructive Examination
8. Which insulation material is typically specified for high-temperature steam piping operating above 850°F (454°C)? → Calcium silicate
9. What type of pipe hanger is designed to allow the pipe to move axially (along its centerline) while still providing vertical support? → Sliding pipe support or roller support
10. What is the primary purpose of a swing check valve? → Prevent backflow
11. When using a chain hoist to lift a pipe section near electrical lines, the minimum safe approach distance for unqualified workers near 50 kV lines is: → 10 feet
12. Which type of pipe joint is most suitable for underground gas distribution piping? → Butt weld
13. What education or training pathways can help pipefitters advance to higher-paying roles? → Enrolling in Advanced Apprenticeship Programs
14. When using a chain fall (chain hoist) to lift a pipe section, what must be verified before lifting? → The rated capacity of the chain fall meets or exceeds the load weight
15. A spring hanger is used instead of a rigid support when: → Thermal expansion causes the pipe to move vertically during operation
16. What is the primary purpose of a swivel hoist ring compared to a standard eyebolt for rigging? → It allows 360-degree rotation and angular loading without reducing rated capacity
17. What factors influence a pipefitter’s choice of industry? → Pay Scale
18. What is the minimum air quality (oxygen level) required before a worker may enter a confined space without supplied air? → 19.5%
19. A drawing callout reads '4" SCH 80 × 3" SCH 80 ECC RED FF.' What does 'FF' indicate? → Flat-face flange end
20. When qualifying a welding procedure specification (WPS) under ASME Section IX, changing the base metal P-Number typically requires: → Requalification of the procedure with a new PQR
21. When cutting carbon steel pipe with an oxy-fuel torch, the cutting oxygen lever should be opened at which point in the process? → After the base metal has reached bright cherry-red or orange heat
22. What is the purpose of a pipe anchor (fixed point) in a piping system? → To prevent all movement and absorb forces at a specific location
23. What is the inside diameter of a 4-inch Schedule 80 steel pipe, given that its wall thickness is 0.337 inches? → 3.626 inches
24. When a pipefitter discovers an unmarked underground utility line during excavation, what is the correct immediate action? → Stop work and notify the supervisor and utility owner
25. A pipefitter is preparing to break open a flange on a process line that carried caustic soda. What PPE is most critical beyond standard items? → Face shield, chemical splash goggles, and chemical-resistant gloves
26. Which of the following is a primary responsibility of the "attendant" during a permit-required confined space entry? → To remain outside the space and continuously monitor entrants and conditions.
27. On a piping isometric drawing, what does the abbreviation 'EL' typically precede? → The elevation of a pipe's centerline
28. What does the abbreviation 'BW' next to a pipe connection on a P&ID indicate? → Butt weld
29. Under OSHA's Process Safety Management (PSM) standard, which quantity of a highly hazardous chemical triggers PSM requirements? → The threshold quantity listed in 29 CFR 1910.119 Appendix A
30. What is the function of a strainer installed upstream of a control valve? → Remove debris that could damage the valve seat