Pipefitter Pipe Testing and Inspection

Question 1

According to ASME B31.3, what is the minimum hydrostatic test pressure for a process piping system?

Accepted Answer

1.5 times the design pressure

Answer

1.1 times the design pressure

Answer

2.0 times the design pressure

Answer

1.25 times the design pressure

Question 2

Why is water preferred over air as the test fluid in hydrostatic pressure testing?

Accepted Answer

Water is incompressible, releasing less stored energy if a failure occurs

Answer

Water is easier to source on job sites

Answer

Water creates higher test pressures

Answer

Water is required by all ASME codes

Question 3

What is the minimum hold time at test pressure required by ASME B31.3 for a hydrostatic pressure test?

Accepted Answer

10 minutes

Answer

5 minutes

Answer

30 minutes

Answer

1 hour

Question 4

Which non-destructive examination (NDE) method uses high-frequency sound waves to detect internal flaws in pipe welds?

Accepted Answer

Ultrasonic testing (UT)

Answer

Radiographic testing (RT)

Answer

Magnetic particle testing (MT)

Answer

Liquid penetrant testing (PT)

Question 5

Under ASME B31.3, what is the minimum pneumatic test pressure when hydrostatic testing is not feasible?

Accepted Answer

1.1 times the design pressure

Answer

1.5 times the design pressure

Answer

1.25 times the design pressure

Answer

2.0 times the design pressure

Question 6

What is the primary reason for venting high points in a piping system during hydrostatic pressure testing?

Accepted Answer

To remove trapped air pockets that could cause inaccurate pressure readings

Answer

To increase the test pressure rapidly

Answer

To introduce test fluid at a faster rate

Answer

To flush contaminants from the system

Question 7

Which NDE method projects ionizing radiation through a weld to create an image showing internal defects on film or a digital detector?

Accepted Answer

Radiographic testing (RT)

Answer

Ultrasonic testing (UT)

Answer

Magnetic particle testing (MT)

Answer

Liquid penetrant testing (PT)