What is It?

Unloading valves are very similar to balanced, pilot-operated relief valves. The only difference is where the pilot pressure comes from.

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In unloading valves when external pressure is applied to Port X that is greater than the pilot setting, the pilot poppet will crack open, allowing the main poppet to open. System flow will then unload from Port P to Port T.

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You MIGHT be able to reroute, BUT it sounds like the heat exchanger you are thinking about going to is after the process equipment and pretty much at the end of the lines. If this is true, you might have lost considerable pressure before you reach the exchanger. If that is the case, it is possible that the heat exchanger has a design pressure much lower than the pump discharge and of course it would not be acceptable to reroute high pump discharge pressure into a lo pressure exchanger. Please find some engineer and have him CHECK THE RATINGS of the exchanger, its relief valve settings if any, piping and everything inbetween.

Perhaps better suggestion for present is, first, check the minimum flow requirements of the pumps. (API actually suggests min op flows not lower than 60% BEP to avoid long term damage.) It sounds like you are operating at very low flow rates. Probably much lower than intended. If not, maybe you are operating at low flows for much longer time than intended in the original design. Review your current operating practices and current flow rates versus the intent of the original design. It just may be a change in pumps or modification of the pump could be the best solution. Doesn't hurt to check that first.

Depending on how low the flow, especially when too low, you can generate considerable heat.You MIGHT be able to reroute, BUT it sounds like the heat exchanger you are thinking about going to is after the process equipment and pretty much at the end of the lines. If this is true, you might have lost considerable pressure before you reach the exchanger. If that is the case, it is possible that the heat exchanger has a design pressure much lower than the pump discharge and of course it would not be acceptable to reroute high pump discharge pressure into a lo pressure exchanger. Please find some engineer and have him CHECK THE RATINGS of the exchanger, its relief valve settings if any, piping and everything inbetween.Perhaps better suggestion for present is, first, check the minimum flow requirements of the pumps. (API actually suggests min op flows not lower than 60% BEP to avoid long term damage.) It sounds like you are operating at very low flow rates. Probably much lower than intended. If not, maybe you are operating at low flows for much longer time than intended in the original design. Review your current operating practices and current flow rates versus the intent of the original design. It just may be a change in pumps or modification of the pump could be the best solution. Doesn't hurt to check that first.

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