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Safety by design, Even knowledge, skill, caution and written procedures cannot permanently guarantee safe operation during production or maintenance. At times, human failure even defeats the most advanced electronic safety measures. Alcatraz Interlocks designs, manufactures and installs interlocking systems to prevent potentially hazardous situations caused by errors in the operating sequence of industrial processes. With our interlock systems, the operator is simply forced to follow a predetermined sequence by means of a mechanical coded key transfer. Since our founding in 1993, we have developed into an international operating company with worldwide representation.
 
Handwheel valve interlocks
Alcatraz integral multi turn valve locks fit on all type of handwheel operated valves
  Interlock description
Alcatraz integral multi turn (type DML/SML) valve interlocks fit on all types of handwheel operated valves, such as gate, globe and all gear operated valves. The interlocks are easy to install, even when the valve is in a live process.

They are mounted on multi turn valves to interlock the locked open and/or locked closed position of the valve. Only if both keys are inserted into the lock portions the valve can be operated.

The first key can only be released in the fully open position, the other key can only be released in the fully closed position. Typical applications include changeover valves (gate or globe), pressure relief valves, loading and unloading of pig traps and sampling devices.
 
Lever valve interlocks
Alcatraz integral quarter turn valve locks fit on all type of lever operated valves.
  Interlock description
Alcatraz integral quarter turn (DQL/SQL) valve locks fits on all type of lever operated valves such asball valves, plug valves, 3-way ball valves, butterfly valves and even instrument valves.

They are mounted on 90° rotating valves to interlock the locked open and/or locked closed position of the valve. Only if both keys are inserted in the lock portions the valve can be operated.

The first key can only be released in the fully open position, the other key can only be released in the fully closed position. Typical applications include changeover valves (ball), pressure safety relief valves, loading and unloading of pig traps and sampling devices. Also 180°and 270° rotation are possible as an option.
 
Closure door interlocks
The Alcatraz closure door lock prevents the bleed plug from being removed and prevents the closure door from being opened.
  Interlock description
The Alcatraz closure door lock is designed to interlock the closure door of a pigging vessel. The closure lock prevents the bleed plug from being removed, this means it prevents the closure door from being opened.

Only the insertion of a dedicated key releases access to the bleed bolt, so it can be removed. This key is only released after the door is closed and the bleed plug is back in its place. The Alcatraz closure lock is suitable for all types, sizes and different manufactures of closure doors.

During the pig launching and receiving procedure, the operating written procedures must be followed carefully by the operators. If the vessel is not drained and vented, or when the isolation valves are not fully closed before opening the closure door, extremely dangerous situations can transpire.

The Alcatraz Interlocks closure lock (CL), as a part of an interlocking sequence, prevents these hazardous situations. By guaranteeing and safeguarding that the isolation valves are closed and the vessel is vented and drained before the closure door can be unlocked and opened.