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 JDC is one of very few companies focused on the analyzer safety systems. There is a need in every company to ensure that samples released to the atmospheric vent header are handled properly or if the sample pressure is too great that the sample is vented to the flare thus saving the analyzer sample system. JDC specializes in the installation of TRACErase systems for analyzer shelters and the testing of relief valves for sample systems.

Our full range of services relative to the sizing, verification, and modeling of Analyzer Systems and Pressure Safety Relief Valves (PSVs or PSRVs) including the following:

  • Flare stack or vent stack sizing (height, diameter, tip configurations, etc. Flare manufacturers are also consulted to ensure the best available technology is included in the design. Knockout drums and blowdown systems are also designed and sized for each particular installation, possibly including specialized features such as knockout drum vaporization or pump-out capabilities.

  • Generate required PSV specifications (spec sheets)


  • Pressure safety valves, traditional spring loaded relief valves these systems are designed to protect a process by safely relieving excess pressure under abnormal operating conditions. It is critical that they be sized appropriately to protect both personnel and physical assets. Many such relief devices are simple stand alone units venting to the atmosphere, while others are highly specialized devices designed to handle two-phase flow and tie into a complex process wide vapor collection or flare header system. Typically we are asked to either provide specific relief valve sizing/evaluation or we are asked to perform an entire flare header system evaluation with many relief devices connected to it. JDC has significant experience with the entire range of system and device types.

Relief Device Evaluation:

  • Collect information on the existing system (PSV data, P&IDs, protected equipment information, flare header isometrics, inlet/outlet line sizes, etc.).

  • Work with the client’s technical staff to develop the credible relief scenarios, both for individual analyzers and especially for those effecting entire units or sections of the plant (blocked flow, external pool fire, loss of cooling, loss of power, etc.).

  •  From this information, the controlling scenario is determined and the valve is sized.

  • For evaluation of existing valves, the required flow rate and actual flow rate capacity for the relief valves are calculated.  From this information, the controlling scenario is determined to check if the existing valve is sized appropriately.


  • JDC can provide an initial review of your system, a summary of findings, a solution to stay in compliance and offer a maintenance and calibration service plan.

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