When pressurizing a system with nitrogen for a leak test, what equipment must be used with the nitrogen cylinder?
Safety · EPA 608 Core. The correct answer, and the reasoning behind it.
Exposure risks, protective equipment, the 80% cylinder limit and nitrogen for leak testing.
The question
When pressurizing a system with nitrogen for a leak test, what equipment must be used with the nitrogen cylinder?
- A vacuum pump and a micron gauge
- A recovery machine and a scale
- A pressure regulator and a relief valveCorrect answer
- A sight glass and a filter-drier
Why “A pressure regulator and a relief valve” is correct
A full nitrogen cylinder can be above 2,000 psig, far more than a system can safely hold. A pressure regulator reduces it to the test pressure, and a relief valve in the line protects the system if the regulator fails.
Source: EPA: Test Topics
Why the other answers are wrong
- A vacuum pump and a micron gauge — A vacuum pump and micron gauge are for evacuation, not pressurizing.
- A recovery machine and a scale — Recovery machines and scales are for removing and weighing refrigerant.
- A sight glass and a filter-drier — A sight glass and drier are system parts, not nitrogen safety devices.
Practice more of this
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