Heat (A Connection) : To loosen a collar or other threaded connection by striking it with a hammer. Also, WARM (a connection) or WHIP (a connection). (ITOGP).
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}