According to NFPA regulations, what conditions must regulators be protected against?

Regulators used in compressed natural gas systems must be protected against environmental conditions that could impair their function or safety. Freezing rain, sleet, snow, and debris can obstruct or damage a regulator, leading to hazardous situations such as leaks or improper gas flow. These elements can introduce water into the system or cause physical damage that compromises the integrity of the regulator.

Proper protection against these specific environmental factors is crucial for maintaining the safety and reliability of the gas delivery system. Other conditions, while potentially impactful in different contexts, do not pose the same direct threats to the operational performance of gas regulators as severe weather and debris do.