Alternative Pressure Setting on Multiport® Relief Valve Manifolds

Field Topics are intended to provide useful information to the network of authorized LP-Gas and Anhydrous Ammonia distributors regarding the proper use of RegO® products.

Warning Bulletins covering many of the hazards involved are available from RegO for more detailed information. These bulletins can be found in our L-500, L-102 and NH3-102 catalogs. Neither the Field Topic or the Warning Bulletins are intended to conflict with federal, state, or local ordinances and/or regulations, which should be observed at all times. This information also is not intended to be a substitute for or to supplement any training in the safe handling and use of propane and related equipment, as required by any applicable law. By providing this material, ECI assumes no responsibility for providing any such training. Only individuals properly trained in the safe handling and use of propane and related equipment should be permitted to do so, and by providing this information, ECI does not assume responsibility for providing such training

For more information on LP Gas system requirements, refer to Liquefied Petroleum Gas Code (NFPA 58), National Fuel Gas Code (NFPA 54), National Propane Gas Association Safety Handbook, the RegO LP-Gas Serviceman’s Manual L-545, RegO catalogs L-500/L-102/NH3-102, ANSI K61.1 Safety Requirements for Storage and Handling of Anhydrous Ammonia, as well as any applicable local codes and ordinances.

Alternative Pressure Setting on Multiport® Relief Valve Manifolds 

This field topic is designed to aid in selecting an alternative pressure setting when using a RegO Multiport® relief valve manifold. There are some cases where design may warrant a different pressure setting due to application or derating of a pressure vessel. 

Multiport® Manifolds are designed especially for use as a primary relief device on large stationary pressurized storage containers with flanged openings. These manifolds incorporate an additional relief valve, not included in the flow rating, allowing for servicing or replacement of any one of the relief valves without evacuating the container. The handwheel on the manifold selectively closes off the entrance port to the relief valve being removed while the remaining relief valves provide protection for the container and its contents. All manifold flow ratings are based on flow through the relief valves after one has been removed for service or replacement. 

When modifying an existing system fitted with Multiport® manifolds to a different pressure setting the Multiport must be replaced with the manifold specifically marked for the pressure setting. Simply changing the relief valves will render the data plate inaccurate and will provide incorrect information. Replacing the manifold will ensure the data plate will provide accurate information on the model number, relief valve and flow capacity. It is especially important to the flow capacity of the manifold and any replacements must meet the requirements of the vessel.  Failure to replace the entire manifold assembly could result in improper replacement relief valve models and pressure setting during replacement intervals.  This could create a hazardous condition in which the container is not properly protected.

It is important to obtain the following information prior to ordering a new manifold: 

  1. Container Flange Connection 
  1. Desired Set Pressure 
  1. Minimum Required Rate of Discharge for Pressure Vessel in SCFM Air 

Should you have any questions or concern, please contact Cody Reeves.

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Field Topic Conductor :

​​Cody Reeves – LPG Tech. Services Manager

10+ years as a Propane Service Technician including installation and service of gas equipment.​​

State of CT Licensed Gas & Oil contractor.​​

Graduated from a Technical high school majoring in HVAC