Preventative Maintenance 4 : Service operations performed on sub-surface safety valve equipment not initiated as a result of SSSV equipment malfunction or failure. (RP 14B)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}