Pipefitter Core Responsibilities 5

Question 1

When installing a pump suction line, the preferred configuration to prevent cavitation is:

Accepted Answer

Long, straight horizontal run with an eccentric reducer flat-side up

Answer

An eccentric reducer installed flat-side up prevents air pockets from collecting at the pump suction and reduces cavitation risk.

Question 2

Which type of valve is BEST suited for throttling flow control in a process line?

Accepted Answer

Globe valve

Answer

Globe valves are designed for throttling because their disc moves perpendicular to flow, providing good control over partial openings.

Question 3

A pipefitter notices that a gasket is compressed beyond its recommended torque spec. What is the most likely consequence?

Accepted Answer

Gasket blowout or extrusion leading to leakage

Answer

Over-torquing a gasket causes it to crush, crack, or extrude beyond the flange face, resulting in leakage.

Question 4

What is the correct sequence for bolt tightening on a pipe flange connection?

Accepted Answer

Tighten opposite bolts in a cross or star pattern

Answer

Cross-pattern tightening ensures even gasket compression and prevents flange cocking or uneven seating.

Question 5

A pipefitter must select the correct pipe hanger spacing for a 4-inch schedule 40 carbon steel line carrying water. The primary factor governing maximum span is:

Accepted Answer

The allowable sag and stress in the pipe between supports

Answer

Hanger spacing is determined by allowable pipe deflection and bending stress, as specified in MSS SP-69 or ASME B31 codes.

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Pipefitter Core Responsibilities 5