PHE Disassembly & Reassembly: 10 Do's and Don'ts
PHE Disassembly & Reassembly: 10 Do's and Don'ts
Opening a plate heat exchanger is routine work, yet small habits decide whether the pack seals on the first close or weeps at start-up. These plate heat exchanger disassembly tips cover the ten rules below, from shutdown to the final tighten.
Before You Open the Unit
Do shut the unit down, isolate and drain both sides, and let it cool. Confirm no pressure remains. Don't open a pack that is still hot, pressurised, or holding fluid.
Record the A-Measurement
Do note the A-measurement, the closing dimension, while the pack is still tight. Don't go from memory: without it, tightening is guesswork and the plates may already be worn.
How to Disassemble a Plate Heat Exchanger
Do loosen the tie bolts diagonally, a little at a time, over several passes. Don't free one bolt all the way out first; that tips the pack and can bend plates.
Keep the Plate Order and Clean the Grooves
Do number every plate as you lift it off the guide bar. Plate heat exchanger plate order sets the flow path, so keep the stack in sequence, and scrape out old gaskets with a blunt plastic tool. Don't mix the order or use a metal scraper; one score line will leak.
Close It Evenly
Do plan the plate heat exchanger reassembly the same way: stack the plates in order, close to the recorded A-measurement, and tighten plate heat exchanger bolts diagonally in small stages. Don't over-tighten to stop a weep, or close the pack in one pass.
Do | Don't
Shut down, drain, cool | Open hot or pressurised
Record the A-measurement | Go from memory
Loosen diagonally, in passes | Free one bolt first
Number the plates, clean groove | Mix the order, score a plate
Close to A, tighten in stages | Over-tighten, one pass
Three Questions
Q: How do I disassemble a plate heat exchanger safely?
A: Isolate and drain it, confirm it is cool and unpressurised, then loosen the tie bolts diagonally and lift the plates from the guide bar.
Q: Should I mark the plates before removing them?
A: Yes. Number each plate and keep the stack in order; a mixed pack changes the flow path and can leak.
Q: How tight should the tie bolts be?
A: Close the pack to the A-measurement on the nameplate, or the value you noted before opening, then tighten diagonally in stages. Do not chase a leak with torque.
Send Us the Nameplate
Before you open the pack, send a photo of the nameplate and the old gasket, plus your fluid and temperature. We will match the part and quote. Email info@newroc-phe.com.
