MCC-NH Gas Fitters Practice Exam

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What is the normal ASP (average service pressure) for natural gas?

1.5"w.c. to 5"w.c.
3.5"w.c. to 8"w.c.
4"w.c. to 10"w.c.
2"w.c. to 6"w.c.

The correct answer is: 3.5"w.c. to 8"w.c.

The normal average service pressure (ASP) for natural gas typically falls within the range of 3.5 inches water column (w.c.) to 8 inches water column (w.c.). This range is used in residential and light commercial applications where natural gas is provided for appliances such as furnaces, water heaters, and stoves. Maintaining this pressure is crucial because it ensures that gas appliances operate efficiently and safely. If the pressure is too low, appliances may not function properly, leading to incomplete combustion and potential safety hazards. Conversely, excessively high pressure can cause appliance damage and increase the risk of leaks. This pressure range ensures compatibility with standard gas appliances designed for low-pressure operation, making it a widely accepted norm in the industry for effectively supplying natural gas to end-users.