Steamfitter Key Skills and Knowledge Areas 3

Question 1

What is the correct bolt torque sequence when assembling a gasketed pipe flange?

Accepted Answer

Tighten in a cross (star) pattern

Answer

A cross or star pattern ensures even compression of the gasket and prevents distortion of the flange faces.

Question 2

Which type of valve is best suited for throttling (regulating) steam flow in a process system?

Accepted Answer

Globe valve

Answer

Globe valves are designed for throttling service because their disc moves perpendicular to flow, allowing fine flow control.

Question 3

A pipe hanger spacing chart specifies 10-foot maximum spans for 2-inch carbon steel pipe. What is the consequence of exceeding this span?

Accepted Answer

Excessive pipe sag causing condensate pooling and possible failure

Answer

Spans that are too large allow pipes to sag, creating low points where condensate collects, risking water hammer and structural stress.

Question 4

What is the purpose of a trap on a steam condensate return line?

Accepted Answer

To discharge condensate while retaining live steam

Answer

A steam trap automatically removes condensate and non-condensable gases from the system without allowing live steam to escape.

Question 5

When performing a hydrostatic pressure test on a newly installed piping system, the test pressure is typically set at what value?

Accepted Answer

1.5 times the design pressure

Answer

ASME B31.1 and B31.3 codes typically require hydrostatic test pressure to be 1.5 times the design (maximum allowable working) pressure.

(Steamfitter) Steamfitter Pipefitter Exam Practice Test