Closure Locks (CL)0 pages

Process Interlocking
Closure Locks (CL)
During pig launching and receiving, written procedures
must be followed carefully. When the vessel is not
drained and vented or when the isolation valves are not
fully closed before opening the closure, very dangerous
situations can occur.
The NETHERLOCKS closure lock (CL), as part of an
interlocking sequence, prevents these situations by
guaranteeing that the isolation valves are closed and the
vessel is vented and drained before opening the closure.
Because there are many closure types, each design is
different, parts of our CL are custom designed for each
type and size of closure.
However, the design philosophy behind the Netherlocks
CL remains the same; in general, opening of a closure
requires removal of a bleedbol t. The Netherlocks Closure
Lock prevents the bleedbolt from being removed and thus
the closure cannot be opened. Only insertion of a unique
linear key releases the bleed bolt in order to open the
closure. As long as the closure is open, the unique key is
trapped. Only when the door is fully closed and the bleed
bolt is in its original position, the key, necessary to
continue the procedure, is released.
The NETHERLOCKS closure lock is suitable for every
type and size of closure.
Features:
o Fully Stainless Steel AISI 316
o Robust, reliable and simple design
o Fully maintenance free
o Tamperproof
o Invulnerable for sand, dirt, snow, ice, etc…
o Thoroughly tested to withstand the most
extreme operating environments
o Optionally, electronic components can be
integrated to establish feedback to the control room