Steam Coil Air Pre Heater (SCAPH) is an extended surface type heat exchanger. This equipment is used to heat atmospheric air to the required process temperature by means of saturated steam. Steam flows inside the tube while air passes over the finned tubes.

It is generally used for heating combustion air in boilers. This type of equipment is normally incorporated into the design of a boiler unit for low load operation and startup operation particularly in those areas with low ambient air temperatures.It is generally located in the duct between the FD fan and the main air heater. In those areas that have extremely low ambient air temperatures, it is common to have this ahead of the FD fan that could preheat cold winter air up to about 40°C. SCAPH find extensive use with all types of High Capacity Boilers, Recovery Boilers, Dryers etc.

It is also used to heat process air in Sugar Mills, Starch Mills, Chemical & allied Industries