Indirect water bath heater are sometimes called line heaters . Indirect fired water bath heater /Line Heaters is the process equipment need to prevent hydrates. Hydrates are often formed during depressurization or sudden decrease in pressure. Hydrates are poison which will block and damage downstream equipments , valves and instruments. Indirect fired heaters /Line heaters heat the gas stream before and / or after the choke so that the gas is maintained above the hydrate temperature. Indirect fired water bath heater / Line Heaters can be used to heat crude oil for treating, heat a hot fluid circulating medium. Most common equipment type used to heat a well stream is the indirect fired water bath heater/Line heater . Indirect fired water bath heater/Line Heater is used to maintain or increase above 120 deg F, which is well above hydrate formation temperature for LTX. In fire tube Indirect fired water bath heater...