Heating – Methods

Heating – Methods

Methods of Cargo Heating

Thermal Oil

Thermal Oil Heating Systems have been installed in a large number of chemical tankers during the last few years. Thermal oil fed directly to various types of coils is used in most of the chemical tankers built nowadays.

To maximise heating efficiency both horizontal and vertical heating coils can be used in cargo heating. The pipe materials are stainless steel or carbon steel.

Thermal oil may also be used in deck heating systems.

A ‘food-grade’ oil can be specified for the heating of edible oils, molasses etc.

Suitable for:

  • Cargoes which react violently with water:
  • TDI
  • High temperature cargoes, for example:
  • Asphalt
  • Bitumen
  • Coal Tar

Not Suitable for:

  • Edible Oils, except when a ‘food-grade’ oil is used.
  • Molasses, except when a ‘food-grade’ oil is used.

Indirect systems are also used with the thermal oil used to produce hot water for heating via coils or in deck-mounted heaters.

Steam Heating

The traditional method of cargo heating which involves high-pressure saturated steam. This type of heating may be via internal cargo tank heating coils, or by a deck-mounted heater.

Suitable for:

  • Edible oils
  • Molasses

Not Suitable for:

  • Cargoes which react violently with water:
  • TDI
  • Asphalt, or other high temperature products.

Boundary Heating

This method involves putting cofferdams or void spaces around a cargo tank, then filling those cofferdams or voids with water and heating that water.

Expensive in construction and only seen on some highly specilised ships.

Suitable for:

  • Cargoes which react violently with water (do pressure test the bulkheads)

Not Suitable for:

  • High heat products

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