Indirect Heated Vessel : A vessel or heat exchanger used to increase the temperature of a fluid by the transfer of heat from another fluid such as steam, hot water, hot oil or other heated media. (RP 2G)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}