The HSV-CL door access interlock
HAAKE STAINLESS STEEL CLOSURE LOCK
The HSV-CL is a door access interlock designed to work with the HSV valve interlock system key. It is mainly used to control the safe opening and closing of cabinet or pig launching closure doors.
Multiple hazards prevail when loading or unloading a pig trap and include:
- Opening the trap door while the vessel is under pressure or ‘on-stream’!
- Trying to pass a pig through a partially open outlet valve!
- H2S leaking to atmosphere!
The closure lock (CL) forms part of an interlocking sequence that ensure the isolation valves are closed and the vessel is vented and drained before opening the closure.
Since every closure is different the CL locks are custom designed. However the design philosophy behind the CL lock remains the same; in general, opening of a closure requires removal of a bleed-bolt. The closure lock prevents the bleed-bolt from being removed and thus preventing the closure from being opened.
