SPED Pressure Testing & Commissioning 3

Question 1

What ASME B31.3 hydrostatic test pressure multiplier is applied to the design pressure for normal fluid service?

Accepted Answer

1.5×

Answer

ASME B31.3 requires a hydrostatic test pressure of at least 1.5 times the design pressure for normal fluid service piping.

Question 2

During commissioning of a utility water system, a valve is found to pass slightly when in the closed position. This deficiency is classified as which punch list category?

Accepted Answer

Category A (blocks mechanical completion)

Answer

Valve passing in the closed position is a Category A punch item because it can affect safe operation and must be resolved before mechanical completion sign-off.

Question 3

Which test method uses acoustic emission sensors placed on the pipe exterior to detect leak location during pressurization?

Accepted Answer

Acoustic emission testing (AET)

Answer

Acoustic emission testing detects and locates leaks by analyzing high-frequency stress waves emitted from crack growth or fluid escaping through defects.

Question 4

When pressure testing a piping system with multiple pressure ratings, the test pressure is governed by which component?

Accepted Answer

The lowest-rated component in the system

Answer

The test pressure must not exceed the capability of the weakest (lowest-rated) component in the system to prevent damage during testing.

Question 5

Which commissioning activity verifies that instrument transmitters are reading correctly at known process conditions before startup?

Accepted Answer

Loop checking

Answer

Loop checking involves applying a known signal or process condition and verifying the entire measurement loop reads correctly at the control system.

(SPED) Society of Piping Engineers and Designers Certification Practice Test

(SPED) Society of Piping Engineers and Designers Certification Practice Test

SPED Pressure Testing & Commissioning 3