Which statement about LPG testing is true?

• A. Smoking is allowed within 50 feet
• B. Ignition sources may be present near testing
• C. A spark watch is required during testing
• D. There is no smoking nor source of ignition within 50 feet of testing LPG

Answer: (D)

LPG testing must be done in an area free from ignition risks because LPG vapors are highly flammable and can ignite from a spark or flame. The safety rule is to keep all ignition sources and smoking completely away from the testing zone, typically by establishing a clear radius. If there is no smoking and no ignition sources within 50 feet of the testing area, the chance of an ignition is greatly reduced, which is why that statement is true.

The other options conflict with safe practices: allowing smoking within 50 feet introduces a potential ignition source near vapors; permitting ignition sources near testing increases the risk; and while a fire watch or spark watch can be part of some procedures, it does not replace the fundamental requirement to remove ignition sources within the specified distance. The essential idea is to maintain a safe radius with no smoking or ignition sources to protect against LPG fires.