Steamfitter Pipe Systems and Materials 3

Question 1

Which ASME piping code governs power piping systems, including steam, feedwater, and drains in power plants and industrial facilities?

Accepted Answer

ASME B31.1 (Power Piping)

Answer

ASME B31.1 (Power Piping) covers steam, water, oil, gas, and other fluid piping in power plants and industrial heating systems; it is the primary code governing steamfitter work on high-pressure systems.

Question 2

When performing a hydrostatic pressure test on a completed piping system, the test pressure is typically set at what value relative to the design pressure?

Accepted Answer

1.5 times the design pressure

Answer

Per ASME B31.1 and B31.3, the standard hydrostatic test pressure is 1.5 times the design pressure (with adjustments for temperature), using water as the test medium.

Question 3

What calculation method is typically used under ASME codes to determine the required wall thickness of a pipe for pressure service?

Accepted Answer

The Barlow formula or equivalent code stress calculations

Answer

The Barlow formula (t = PD/2S) and equivalent ASME code calculations relate internal pressure (P), outer diameter (D), and allowable stress (S) to determine minimum required wall thickness (t).

Question 4

What is the term for the maximum stress that a pipe material is permitted to experience at a given operating temperature, as defined by ASME codes?

Accepted Answer

Allowable stress

Answer

Allowable stress (also called basic allowable stress) is the code-specified maximum stress permitted in a material at a given temperature; it is derived from the material's tensile and yield strengths divided by appropriate safety factors.

Question 5

What is the purpose of a pipe anchor in a steam distribution system?

Accepted Answer

To fix the pipe's position and absorb the forces generated by thermal expansion

Answer

Pipe anchors fix the pipe at specific points, absorbing expansion forces and controlling pipe movement direction; they work in conjunction with guides and expansion loops or joints to manage thermal growth.

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

(Steamfitter) Steamfitter Pipefitter Exam Practice Test

Steamfitter Pipe Systems and Materials 3