When adjusting a system regulator, what is the maximum lockup pressure allowed?

The maximum lockup pressure in the context of adjusting a system regulator is crucial for ensuring the safe and efficient operation of a gas delivery system. A lockup pressure refers to the point at which the regulator stops allowing gas to flow under zero flow conditions, essentially "locking up" the pressure within the system.

Typically, the maximum lockup pressure for residential and light commercial applications is set at 14 inches of water column. This standard is in place to prevent potential hazards and to ensure that the pressure does not exceed what is deemed safe for typical appliances and systems. If the lockup pressure were to be set excessively high, it could lead to overpressure situations that might cause damage to equipment or create unsafe conditions.

Understanding this maximum limit is essential for technicians working with gas regulators, as it helps in ensuring compliance with codes, maintaining equipment integrity, and preventing safety incidents. Other options reflect pressures that exceed the standard, which may not be suitable for most applications.