1|P age
Pipefitter STAR Certification Exam (2025/2026 Latest
Updated Version) | Complete Q&A with Verified
Correct Solutions | High-Accuracy Pass-Assured
Professional Exam Pack
Course Name: Industrial Piping Systems & Fabrication
Subject: Pipefitting, Blueprints, Safety, Welding, Fabrication, Codes
Description:
This exam evaluates mastery of piping systems, blueprint interpretation, pipe math,
offsets, welding procedures, supports, valves, safety regulations, steam systems,
hydraulics, and fabrication methods used in industrial, commercial, and refinery
settings. Questions follow realistic on-site tasks and code-based procedures to
prepare learners for advanced pipefitting roles and certification.
1. Which type of pipe is most commonly used for high-pressure steam?
A. PVC
B. Copper L
C. Schedule 80 carbon steel
D. PEX
Answer: C. Schedule 80 carbon steel
Explanation: High-pressure steam requires thick-wall steel to withstand
temperature and pressure.
2. What does the abbreviation “OD” mean in piping?
A. Outer direction
B. Outside diameter
C. Offset distance
D. Operating design
Answer: B. Outside diameter
,2|P age
Explanation: OD identifies the external measurement of a pipe, important for
fittings.
3. The main purpose of a pipe shoe is to:
A. Prevent water hammer
B. Allow sliding movement during expansion
C. Seal flanged joints
D. Measure pipe slope
Answer: B. Allow sliding movement during expansion
4. Which valve provides the most precise flow regulation?
A. Gate
B. Globe
C. Ball
D. Check
Answer: B. Globe
5. A 45° offset uses which formula?
A. Offset = run ÷ 1.414
B. Offset = rise × 1.414
C. Offset = offset × 1.414
D. Offset = run × 1.414
Answer: C. Offset × 1.414
Explanation: 45° offsets use the multiplier 1.414 to determine travel.
6. In a piping isometric, a break in the line usually means:
,3|P age
A. Flanged connection
B. The pipe continues
C. Pipe is damaged
D. Fire-rated wall
Answer: B. The pipe continues
7. Which welding process is most used for root passes on pipe?
A. MIG
B. TIG (GTAW)
C. Flux core
D. Submerged arc
Answer: B. TIG
8. Pipe slope for condensate return typically is:
A. ½ inch per foot
B. ¼ inch per foot
C. Level
D. 1 inch per foot
Answer: B. ¼ inch per foot
9. The purpose of a hydrostatic test is to:
A. Check welding appearance
B. Verify pipe alignment
C. Test for pressure leaks
D. Remove debris from pipe
Answer: C. Test for pressure leaks
, 4|P age
10. Which piping material is NOT allowed for natural gas?
A. Black steel
B. Galvanized steel
C. Copper (in some jurisdictions)
D. Polyethylene (underground)
Answer: B. Galvanized steel
11. What does a socket weld fitting require before welding?
A. 1/16” expansion gap
B. Tight fit
C. Flange alignment
D. Thread sealant
Answer: A. 1/16” expansion gap
12. A pipe saddle support is typically installed when:
A. Pipe size exceeds 12 inches
B. There is heavy vertical load
C. A valve is installed
D. Bends are required
Answer: B. Heavy vertical load
13. A “take-off” in pipefitting refers to:
A. Pipe removal
B. Fitting deduction measurement
C. Welding bead height
D. Pressure drop
Answer: B. Fitting deduction measurement
Pipefitter STAR Certification Exam (2025/2026 Latest
Updated Version) | Complete Q&A with Verified
Correct Solutions | High-Accuracy Pass-Assured
Professional Exam Pack
Course Name: Industrial Piping Systems & Fabrication
Subject: Pipefitting, Blueprints, Safety, Welding, Fabrication, Codes
Description:
This exam evaluates mastery of piping systems, blueprint interpretation, pipe math,
offsets, welding procedures, supports, valves, safety regulations, steam systems,
hydraulics, and fabrication methods used in industrial, commercial, and refinery
settings. Questions follow realistic on-site tasks and code-based procedures to
prepare learners for advanced pipefitting roles and certification.
1. Which type of pipe is most commonly used for high-pressure steam?
A. PVC
B. Copper L
C. Schedule 80 carbon steel
D. PEX
Answer: C. Schedule 80 carbon steel
Explanation: High-pressure steam requires thick-wall steel to withstand
temperature and pressure.
2. What does the abbreviation “OD” mean in piping?
A. Outer direction
B. Outside diameter
C. Offset distance
D. Operating design
Answer: B. Outside diameter
,2|P age
Explanation: OD identifies the external measurement of a pipe, important for
fittings.
3. The main purpose of a pipe shoe is to:
A. Prevent water hammer
B. Allow sliding movement during expansion
C. Seal flanged joints
D. Measure pipe slope
Answer: B. Allow sliding movement during expansion
4. Which valve provides the most precise flow regulation?
A. Gate
B. Globe
C. Ball
D. Check
Answer: B. Globe
5. A 45° offset uses which formula?
A. Offset = run ÷ 1.414
B. Offset = rise × 1.414
C. Offset = offset × 1.414
D. Offset = run × 1.414
Answer: C. Offset × 1.414
Explanation: 45° offsets use the multiplier 1.414 to determine travel.
6. In a piping isometric, a break in the line usually means:
,3|P age
A. Flanged connection
B. The pipe continues
C. Pipe is damaged
D. Fire-rated wall
Answer: B. The pipe continues
7. Which welding process is most used for root passes on pipe?
A. MIG
B. TIG (GTAW)
C. Flux core
D. Submerged arc
Answer: B. TIG
8. Pipe slope for condensate return typically is:
A. ½ inch per foot
B. ¼ inch per foot
C. Level
D. 1 inch per foot
Answer: B. ¼ inch per foot
9. The purpose of a hydrostatic test is to:
A. Check welding appearance
B. Verify pipe alignment
C. Test for pressure leaks
D. Remove debris from pipe
Answer: C. Test for pressure leaks
, 4|P age
10. Which piping material is NOT allowed for natural gas?
A. Black steel
B. Galvanized steel
C. Copper (in some jurisdictions)
D. Polyethylene (underground)
Answer: B. Galvanized steel
11. What does a socket weld fitting require before welding?
A. 1/16” expansion gap
B. Tight fit
C. Flange alignment
D. Thread sealant
Answer: A. 1/16” expansion gap
12. A pipe saddle support is typically installed when:
A. Pipe size exceeds 12 inches
B. There is heavy vertical load
C. A valve is installed
D. Bends are required
Answer: B. Heavy vertical load
13. A “take-off” in pipefitting refers to:
A. Pipe removal
B. Fitting deduction measurement
C. Welding bead height
D. Pressure drop
Answer: B. Fitting deduction measurement
