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Frequently Asked Questions
What does being able to open it give you?
Access to every heat transfer surface.
Inspection and mechanical cleaning become possible.
Fouling fluids stop being a write-off.
Hygiene duties can be demonstrated.
No sealed exchanger can offer this.
It is the main reason to choose one.
Can the duty really be changed later?
Yes, by adding or removing plates.
The frame accepts more within its capacity.
A growing process can be followed.
That is unusual in fixed plant.
Specify frame capacity above today's need.
It costs little at purchase and much later.
What limits the operating envelope?
The gasket, not the metal.
Temperature and pressure ceilings come from elastomer.
Fluid compatibility does too.
That is far below a welded construction.
Check the gasket material against the media.
Welded types exist for what exceeds it.
How often do gaskets need replacing?
On a schedule, not on failure.
They take a compression set and harden with age.
Thermal cycling accelerates it.
A full set for a large unit is a real cost.
It is also a real piece of work.
Budget it from day one.
What does reassembly require?
Care, and a measurement.
Tightening is to a specified pack dimension.
Tightening to feel damages plates or leaks.
Plates return in a defined order and orientation.
Manufacturers publish the procedure.
Following it is not optional.
What space does it need?
More than its footprint suggests.
The pack must be withdrawn sideways to open.
That clearance is easy to lose later.
Other plant gets installed into it.
Mark the access zone at installation.
Without it, cleaning stops happening.
When is a different construction better?
When the media or conditions exceed the gasket.
Aggressive chemicals suit welded types.
High temperature does too.
Clean sealed duties suit brazed units.
Fouling slurries suit spiral geometry.
Choose from the fluid, not from the price.