Stedenbaan 6, 5121 DP Rijen
The Netherlands
Home » Interlocks » Quick opening and closure locks

Quick opening and closure locks

The Alcatraz closure door lock is designed to interlock the closure door of a pigging vessel. The quick opening 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. 

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. 

Applications of quick opening and closure locks

Alcatraz Interlocks’ closure locks can be used for pig trap vessels / systems.

Download specs for Quick opening and closure locks Interlocks

Solutions for quick opening and closure locks

The Alcatraz closure lock is suitable for all types, sizes and different manufactures of closure doors. 

Specs of quick opening and closure locks
  • Machined AISI 316body
  • Material certificate 2.1 (3.1 on request)
  • Electropolishing
  • Tamperproof mounted solutions

Features and benefits of quick opening and closure locks
  • Alcatraz 5 step safety integrity design

Our specialists

Meet specialist Dennis

Do you want to operate safely and prevent failures in your applications? Contact Dennis or one of our technical engineers to discuss how to do it.



Do you want to receive more information about our custom-made valve interlocks and trapped key solutions on your application? Please fill in the contact form and we will respond as soon as possible.


Electrical Key Cabinets

An Electrical Key Cabinet consists of integrated electromechanical components preventing key removal.

Spare Keys

The spare keys are intended to briefly replace a lost key until a replacement has been purchased.

Sequence control units

This is a mechanical device that is designed to fulfil client's complex non-linear Interlocking Sequence requirements.