Project Synopsis

Check relief valve sizing on a glycol heating system as part of a heat exchanger upgrade project.

Project Summary


Process Engineering Associates, LLC (PROCESS) was contacted by the client, a detail engineering firm, to size relief valves for a heat exchanger replacement for the ultimate client, a major chemical manufacturer and diversified technology company.  An existing glycol flush heater was being replaced by a larger one and the glycol preheater was being replaced by one of similar size but with differing pressure requirements.  The current relief valves on both the heater and preheater needed to be evaluated to determine if it was necessary to replace them. PROCESS utilized its proprietary in-house relief device capacity computer program, with calculations based on the guidelines in American Petroleum Institute (API) Recommended Practices (RP) 520 and 521, to determine the pressure relief requirements for the systems.

The following tasks were completed:

  • Relief valve calculations for the 4 relief valves
  • Execution of CHEMCAD simulations to determine the back pressure requirements on the valves
  • Preparation of data sheets for three new relief valves.

A summary of results and calculations were provided to the client, stating the requirements for replacing three of the four valves.

Industry Type

  • Commodity Chemicals Manufacturing

Utilized Skills

  • Pressure relief valve (PRV) and pressure safety valve (PSV) sizing
  • Equipment specification preparation

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