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53.2.1 Emergency Pressure Control System

Fire Code 2018 of West Virginia > 53 Mechanical Refrigeration > 53.2 Safety Features > 53.2.1 Emergency Pressure Control System

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Refrigeration systems containing more than 6.6 lb (3 kg) of flammable, toxic, or highly toxic refrigerant or ammonia shall be provided with an emergency pressure control system in accordance with 53.2.1.1 and 53.2.1.2.

53.2.1.1 High and Intermediate Pressure Zones

Each high and intermediate pressure zone in a refrigeration system shall be provided with a single automatic valve providing a crossover connection to a lower pressure zone. Automatic crossover valves shall comply with 53.2.1.1.1 through 53.2.1.1.4.

53.2.1.1.1 Overpressure Limit Set Point for Crossover Valves

Automatic crossover valves shall be provided to automatically relieve excess system pressure to a lower pressure zone if the pressure in a high or intermediate pressure zone rises to within 90 percent of the set point for emergency pressure relief devices.

53.2.1.1.2 Manual Operation

Where required by the AHJ, automatic crossover valves shall be capable of manual operation.

53.2.1.1.3 System Design Pressure

Refrigeration system zones that are connected to a higher pressure zone by an automatic crossover valve shall be designed to safely contain the maximum pressure that can be achieved by interconnection of the two zones.

53.2.1.1.4 Automatic Emergency Stop

Operation of an automatic crossover valve shall cause all compressors on the affected system to immediately stop in accordance with the following:

Dedicated pressure-sensing devices located immediately adjacent to crossover valves shall be permitted as a means for determining operation of a valve.
To ensure that the automatic crossover valve system provides a redundant means of stopping compressors in an overpressure condition, high pressure cutout sensors associated with compressors shall not be used as a basis for determining operation of a crossover valve.

53.2.1.2 Low Pressure Zone

53.2.1.2.1 Overpressure Limit Set Point for Emergency Stop

The lowest pressure zone in a refrigeration system shall be provided with a dedicated means of determining a rise in system pressure to within 90 percent of the set point for emergency pressure relief devices.

53.2.1.2.2 Automatic Emergency Stop

Activation of the overpressure sensing device shall cause all compressors on the affected system to immediately stop.

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