Overview
Indirect-Fired Gas Heaters (using water-bath or anti-freeze in cold climates) are commonly used for applications such as:

• Fuel gas super-heating prior to turbines
• J-T Heating after pressure reduction 
• Gas heating after low temperature storage
• Hydrate prevention

KCC offers a custom-designed range of water bath heaters, tailored to the individual application, to ensure the fluid (normally gas) is reliably and safely heated to the necessary temperature to meet the downstream process requirements.

Water bath heaters will typically be of the submerged coil type, where the water bath fills an atmospheric vessel, in which is submerged one or more firetubes.  The process fluid circulates through the coil until it is heated by the hot water convection currents.

In colder climates a mixture of water and glycol is used for the bath to prevent freezing.  A water saver tank is often fitted to the top of the heater to minimize any evaporation losses and allow for expansion.  Hot oil bath heaters can also be supplied where higher temperatures are required.

Natural gas is usually used as fuel, via a natural or forced draft burner system operating at high net efficiency.

Special materials and designs are used to combat the firetube thermal stresses inside these vessels, and both U tube and multi-return designs are available.

Burner air ducts are designed with suitable flame arrestors and filter intakes as required.