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Frequently Asked Questions
What does semi-welded actually mean?
Two kinds of channel alternating.
Plate pairs are laser welded into sealed cassettes.
Those cassettes are gasketed to each other.
One fluid never touches an elastomer.
The other runs in conventional gasketed channels.
The frame still opens as normal.
Which duties is it built for?
Where one fluid cannot be trusted to a gasket.
Refrigeration is the classic application.
Ammonia is the classic fluid.
It attacks many elastomers.
A leak carries real consequences.
Water or brine runs safely on the other side.
Why not use a fully welded unit instead?
Because it would stop being serviceable.
A welded block cannot be opened at the frame.
Semi-welded keeps the gasketed side accessible.
Cassettes can be added or removed for duty.
That flexibility is worth keeping.
It is a deliberate middle position.
Which fluid goes on which side?
The aggressive or hazardous one goes welded.
The dirtier one goes gasketed.
That side can be opened and cleaned.
Reversing it is both less safe and harder to maintain.
The decision is effectively permanent.
Settle it at design, not on site.
Do gaskets still need replacing?
Yes, on the gasketed side.
They age and take a compression set as always.
Material must suit the benign fluid.
Replacement remains a scheduled task.
Only one side carries the cost now.
Budget it in the same way.
What happens if a cassette leaks?
It becomes a specialist repair.
Welded cassettes cannot be split routinely.
Individual cassettes may be replaceable.
Lead time can be significant.
Ask about it before purchase.
Critical duties may justify spares.
What should be specified when ordering?
Which fluid is on which side, explicitly.
Design pressure and temperature for both.
Gasket material against the benign fluid.
Plate material against the aggressive one.
Frame capacity for future cassettes.
Any refrigeration code requirements.