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The Type 3 SHE is often called a “steam heater” and has a mixture of Type 1 and Type 2 features. The main feature is that the liquid being heated by the steam is generally fouling, therefore the circuit is designed to be accessible for cleaning, which is not the case with the normal Type 2. In addition the counter-current nature of Type 3 allows tighter temperature approaches that are achievable with the cross-flow nature of Type 2.

Applications

Fouling liquids: containing solids, fibres, liquors, slurries and sludges requiring heating by steam.

 

Benefits

  • Virtually no fouling and clogging
  • Reliable operation, maximum uptime
  • Easy to open and clean, low maintenance costs
  • Energy savings due to high heat recovery.

The Type 3 spiral is often called a “steam heater” and has a mixture of Type 1 and Type 2 features. It can be horizontal or vertical. The main feature is that the liquid being heated by the steam is generally fouling which means that the circuit must be accessible for cleaning.

Therefore the liquid circuit is sealed at one side by welding and at the other end by the gasket face of the end cover (same as for Type 1). The vapour circuit however is more similar to the Type 2, operating in cross-flow rather than spiral flow, and the circuit is sealed by welding along one side. This construction is not so common, most 2-phase applications use the regular type 2.

 

Performance data

Temperature: -100°C to 400°C                                                                                                                                              Design pressure: Full vacuum to 100 barg
Diff. pressure: Up to 50 barg
Heat transfer area (max): 2,500 sqm