Sondex Plate & Shell (SPS):

Design Principles:
The SPS heat exchanger contains a round plate pack in which the waved "herringbone" pattern is pressed into each plate. The products pass through the port holes and into the gap between the plates. The heat transfer happens when the warmer product transfers energy through the flow plates and delivers it to the colder opposing product without mixing both products. The "herringbone" pattern ensures turbulent flow within the effective area. Furthermore, this pattern brings 'metallic' contact between the plates, and then optimal differential pressure is achieved. Duty, type of product, temperatures, pressure drop and the thermal dynamic properties influence the choice of type, size of heat surface and thermal design of the plate pattern. The plate pack is firmly fixed into the round shell.

The SPS plate heat exchanger uses laser welded cassettes, which are made up of two round plates welded together using modern laser welding machines.
These cassettes are designed for chemical processes, in the refrigeration industry such as condensers and evaporators, in the marine area, power stations, heat recovery and many other tasks where high pressure and very high/low temperatures are demanded.

The design pressure is up to 4.0MPa.
The design temperature is from -100°C to 400°C.   

The SPS (Sondex Plate and Shell) heat exchangers:
Within this range of SPS heat exchangers Sondex can offer a range of units from a DN25 to a DN350 connection on the plate side, and on the shell side from DN25 to DN1200. This range of SPS units makes Sondex one of the leading manufacturers of plate and shell heat exchangers.

Sondex SPS units are as standard produced with stainless steel plate packs and carbon or stainless steel shells.

Design and function of the heat exchanger: 
This heat exchanger works in the same way as an ordinary tubular unit. However, it is more efficient because plates have been used instead of tubes. The plates are laser/TIG welded together to form a plate pack, which is then mounted inside a traditional cylindrical shell.
Pressure rating: PN16/PN25. Max temp.: Up to 250°C.

Applications:
• Suitable for NH3
• Evaporators and Condensers
• Fuel oil heaters                                            

Advantages:  
• Small space requirement
(only 30% of a traditional tubular heat exchanger)
• Small liquid volume
• High working pressure
• Safe operation without leaking 
• No gaskets
• Laser welded plates