When a plate heat exchanger is showing its age, there are usually three options: repair or rebuild it, adapt it to a changed duty, or replace it. The right answer depends on a handful of practical questions.
Is the frame sound?
The frame, tie bolts and connections usually outlast the plates and gaskets many times over. If the frame is in good condition, a rebuild — new gaskets and replacement plates where needed — reuses the most expensive and disruptive parts of the installation.
What condition are the plates in?
A few cracked plates can be replaced individually. If corrosion or thinning is widespread across the pack, a complete replacement plate pack is often more economical than replacing plates one by one.
Has the duty changed?
If flows, temperatures or fluids have changed since the unit was selected, it may no longer suit the job. Many frames allow plates to be added or plate materials to be changed. If the new duty is beyond what the frame can take, replacement becomes the better option.
When replacement makes sense
- The frame is badly corroded or damaged
- The unit can’t meet the new duty even with changes
- Parts are no longer available or are uneconomic
- Repeated failures point to a unit that doesn’t suit the application
Making the decision
A strip-down and inspection gives you the facts: plate condition, gasket condition and frame condition. With those, the comparison between rebuild and replacement is straightforward. See rebuilds and new plate heat exchangers.
Weighing up your options? Request a quote or call (02) 9897 7371.