Louisiana Administrative Code
Title 55 - PUBLIC SAFETY
Part V - Fire Protection
Chapter 50 - Boiler Construction, Maintenance, Inspection and General Use
Subchapter E - General Requirements
Section V-5072 - Pressure Reducing Valves

A. Where pressure reducing valves are used, one or more safety relief valves shall be provided on the low pressure side of the reducing valve when the piping or equipment on the low pressure side does not meet the requirements for the full initial pressure. The safety or safety relief valves shall be located adjoining or as close as possible to the reducing valve. Proper protection shall be provided to prevent injury or damage caused by the escaping fluid from the discharge of the safety relief valves if vented to the atmosphere. The combined discharge capacity of the safety or safety relief valves shall be such that the pressure rating shall not be exceeded in case the reducing valve fails in the open position.

B. The use of hand controlled bypasses around the reducing valves are permissible. If a bypass is used around the reducing valve, the safety valve required on the low pressure side shall be of sufficient capacity to relieve all the fluid that can pass through the bypass without over pressuring the low pressure side.

C. A pressure gauge shall be installed on the low pressure side of the reducing valve.