Definition(s)
Extended Shut-in
Closure of valve(s) at top of riser for a period that can last for days.
EXAMPLE For production flowlines, the riser may be displaced to dead oil to limit the risk of formation of hydrates. Shut in conditions for each riser should be defined in the operating plan.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards