Universal practice test, question 76 of 100

A technician must bring an R-113 machine up to atmospheric pressure for a non-major repair. Which procedure follows 40 CFR 82.156(a)(1)(ii)?

• AUse nitrogen alone, since R-113 is exempt from the heat requirement
• BUse heat only, because nitrogen is never allowed on low-pressure machines
• CUse compressed air to reach atmospheric, then purge before opening
• DHeat it as far as heat will go, then add nitrogen up to atmospheric