MCC-NH Gas Fitters Practice Exam

Which of the following represents the requirement for pressure drop in a gas piping system due to temperature change?

1. Only a slight decrease is allowed

2. No allowance for drop due to temperature

3. A significant drop is acceptable

4. Change allowed if well-documented

The correct answer is: No allowance for drop due to temperature

In a gas piping system, pressure drop due to temperature changes is an important consideration since it can impact the efficiency and safety of the system. The requirement is that there should be no allowance for a drop in pressure stemming from temperature variations. Ambient temperature fluctuations can affect gas density, but the pressure maintained in the system should remain stable without design accommodations for such drops. When a gas experiences temperature changes, its pressure should ideally be regulated to maintain system integrity and performance. A well-designed gas piping system accounts for variations in temperature without allowing these to cause any pressure drop. The focus is on ensuring constant pressure for the effective delivery of gas to the appliances and maintaining safety standards. The other options suggest misunderstandings about how pressure should be managed in a gas piping system concerning temperature. Allowing even a slight decrease, accepting significant drops, or requiring documentation for changes indicates a lack of adherence to the strict standards governing gas pressure in such systems. Proper engineering practices dictate that temperature effects on pressure should be maintained within operational limits without resulting in pressure drops.