Vessel Closure Lock Principles
The SFC ‘DL3′ interlock is adaptable to all types of vessel/access closures and is very simple to use in pig trap applications, especially where the closure incorporates a bleed device. The ‘DL3′ interlock will be designed to interface with the bleed function, to ensure the bleed screw cannot be removed until the interlock permit key has been inserted to unlock the ‘DL3′ assembly. This key is usually obtained after opening and locking of the vent valve. When the ‘DL3′ is incorporated into vessel access safety procedures, total equipment and personnel safety is assured.
Locked – Key Released Open – Key Trapped