Vessel Closure Lock

Access into pressure vessels is a potentially hazardous exercise.  Typical examples of potential hazards include pig traps, slug catchers and filter housings.  Locking the vessel closure in the closed position ensures access into the vessel takes place, under controlled-safe conditions. The operating key is held in a secure place e.g. Control Room or is retained (trapped) in some other related interlocked item of equipment. Most international vessel design codes, as a minimum, require vessel closures to be interlocked with venting and draining functions.  This interlocking arrangement can be extended to incorporate all other vessel functions (e.g. draining, purging or flushing).

DL3 2
Locking Arm Engaged                                                                          Locking Arm Released