Semi Welded Plate Heat exchanger
Construction
Laser Welded Plates
Here, the pair of plates are welded and the other side is of gasket channel—means the plate pack consists of welded channels which alternate the traditional gasketed channels. Ring Gasket is placed in the gasket side channel for between Laser welded plates. The ring gasket is of special clip type and can be made suitable for Aggressive media of the welded channel.
The flow principle is same as conventional gasketted type plate heat exchanger . The difference is that every second channel is sealed with the laser weld instead of gasket.
Operation
The refrigerant like ammonia or solvent vapours or special media which is not compatible with normal gasket flows through the welded channel.
and the coolant or other fluids flows in the gasketted channel. All other operations are similar to the Gasketed PHE.Feature and Benefits are similar to the conventional type with additional feature of Great compatibility with critical media .
Standard Specifications
- Pressure: Maximum design pressure is up to 30 bar.
- Temperature: Maximum/Minimum operating temperature is up to 180℃/-40℃
- Corrosion: Resistant to most aggressive media.
Material Channel plates
- SS304, SS304L, SS316, SS316L, SS317L, SS321, 254SMO, Titanium, N200/201, Hastelloy C-276, Hastelloy C-2000, Hastelloy G-30, 904L.
- Plate thickness: 0.6mm, 0.7mm, 0.8mm
- Gasket material: EPDM, Nitrile, Chloroprene, Fluororubber
- Other materials suitable for special working conditions are available as required.
Advantages
- It has all the advantages of a conventional gasket plate heat exchanger has.
- It solved the problem that when the medium in one side of the conventional gasket plate heat exchanger is corrosive, and the rubber gasket cannot meet the requirements.
- It does not require frequent replacement of gaskets which lowers the operating cost. Laser welding is used for sealing and replaces conventional gaskets on the process material side thus largely reduces the procurement of spare parts.
Typical Applications in Refrigeration
- Condensers
- Evaporator
- De-superheater
- Sub-cooler
- Oil-cooler
- Liquid Liquid with critical media on one side.
