GPT GPT Pressure Testing & System Commissioning

Question 1

What is the standard test pressure for a gas piping system before commissioning per NFPA 54?

Accepted Answer

1.5 times the maximum allowable operating pressure

Answer

Operating pressure only

Answer

10 psi flat

Answer

50 psi flat

Question 2

Which test medium is preferred for leak testing gas piping systems?

Accepted Answer

Air or inert gas

Answer

Natural gas

Answer

Water

Answer

Steam

Question 3

How long must a gas piping system hold test pressure to pass a standard pressure test per NFPA 54?

Accepted Answer

15 minutes

Answer

5 minutes

Answer

30 minutes

Answer

60 minutes

Question 4

What procedure must be performed after pressure testing before gas is introduced into a new system?

Accepted Answer

Purging with inert gas

Answer

Flushing with water

Answer

Chemical cleaning

Answer

Hydraulic pressure test

Question 5

Before performing a pressure test, appliance connections must be:

Accepted Answer

Disconnected or capped

Answer

Left connected and operational

Answer

Turned off only

Answer

Removed from the premises

Question 6

A drop in pressure during a static pressure test indicates:

Accepted Answer

A leak exists in the system

Answer

The system passed inspection

Answer

The pressure gauge is faulty

Answer

Normal thermal expansion