Long Term Pressure Cap Panels (LTPCs)
are designed to be left in place on headers until flowline jumpers are
connected to these headers in the later stages of field development.
The LTPCs consist of a 1” bore
receptacle connected to the header with a flanged connection through 2 valves. The
receptacle can be used for pumping fluid into the header. It also has the
facility for hot water hydrate remediation of the LTPC spool and piping.
The subsea manifolds on the BP Atlantis project subsea
system use Long Term Pressure Caps (LTPC) to isolate some of the headers.