Steamfitter Technical Standards and Specifications 3

Question 1

What is the maximum allowable working pressure (MAWP) concept used to determine in piping design?

Accepted Answer

The highest pressure a system can safely sustain during normal operation

Answer

MAWP is the maximum gauge pressure permissible at the top of a completed vessel or piping system in its normal operating position at the designated temperature.

Question 2

According to ASME B31.1, what hydrostatic test pressure is required for new piping systems (as a multiple of design pressure)?

Accepted Answer

1.5 times the design pressure

Answer

ASME B31.1 requires hydrostatic leak testing at 1.5 times the design pressure to verify integrity of new power piping systems.

Question 3

Which AWS standard governs the qualification of welding procedures and welders for structural welding?

Accepted Answer

AWS D1.1

Answer

AWS D1.1 Structural Welding Code—Steel governs the qualification of welding procedures and welders for structural steel applications.

Question 4

What is the purpose of a Procedure Qualification Record (PQR) in piping welding?

Accepted Answer

To record the actual test results that support a Welding Procedure Specification

Answer

A PQR documents the actual variables used and test results obtained when qualifying a Welding Procedure Specification (WPS), providing evidence the procedure produces sound welds.

Question 5

Under ASME B31.1, what is the definition of 'nominal pipe size' (NPS)?

Accepted Answer

A dimensionless designator correlating to pipe outside diameter but not equal to it above NPS 12

Answer

NPS is a dimensionless designator used in the US piping system; for NPS 14 and larger, the NPS number equals the actual outside diameter in inches, but for smaller sizes it does not.

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

Steamfitter Technical Standards and Specifications 3