Definition(s)
Shift Time
Period of time elapsed between the arrival of a control signal at the subsea location (the completion of the signal time) and the completion of the control function operation. NOTE Of primary interest is the time to fully stroke, on a subsea tree, a master or wing valve that has been designated as the underwater safety valve.
Source: API SPEC 17F, Specification for Subsea Production Control Systems, Second Edition, December 2006 (Reaffirmed April 2011). Global Standards