How To Identify A Differential Leak In A GPHE


On occasion, a gasket plate heat exchanger (GPHE) can fail when a plate develops a small crack or in some rare instances when a gasket is dislodged or damaged. When one of these failures causes the two fluids to mix, it's called a differential leak. This can be particularly damaging in the food, beverage, and chemical industries, and can lead to significant downtime. Fortunately, plate heat exchangers are modular, and once the defective plate or gasket is located, it and an adjacent plate simply need to be removed and the GPHE can go back into service, operating at a slightly decreased capacity until you acquire the replacements. So how do you find the defective plate? We've outlined four simple steps below. If you find you're in need of comprehensive GPHE repair or spare parts, give our skilled heat exchanger replacement technicians a call today and let us help you sort out the problem.

Step 1: Drain, Isolate and Dry

The first step is to drain the plate heat exchanger and isolate it from your system. The actual test relies on water, so you'll have to wait for all the plates to dry. You can disassemble it now to speed up the process, but you'll have to reassemble it for the next step, and then disassemble it again for the step after that.

Step 2: Water Test

Secondly, run water through one side of the gasket plate heat exchanger only. Each plate will subsequently have a wet side and a dry side, but the leaky plate and the adjacent plate will be wet on both sides, making them easy to identify by touch.

Step 3: Disassemble

Thirdly, disassemble the plate heat exchanger according to the manufacturer's guidelines. For this step, it's best to leave the plates in the frame so you can go through them one by one more easily.

Step 4: Examine

Last, look at each plate individually and note any that are wet on both sides. Once you've removed all the plates that are wet on both sides, you can reassemble the GPHE and put it back in service at reduced capacity until you have the appropriate replacement parts.

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