Containment, cleaning cycles and validated equipment that fights being opened.
Pharmaceutical lockout has a second axis most industries do not: the equipment is contained, and the containment is a control that must survive the isolation. Isolating a tablet press is straightforward until you realise the pressure cascade keeping a potent compound inside the machine runs on the same services you were about to lock.
Cleaning is the other half. Wash-in-place and clean steam are energy sources that arrive on a schedule and on a controller, not on a valve someone opened. A WIP cycle triggered into an open machine is hot detergent and potent residue in the room.
Then there is validated equipment. Changing anything is a change-control event, so procedures drift out of date more slowly than elsewhere — but when equipment does change, the paperwork lag is longer, and the procedure on the wall is older than the machine in front of it.
The pressure cascade and dust extraction go off with the machine services. The potent compound leaves with the operator.
Electrical is locked and the machine is open. The WIP skid is on its own controller in another room, and its schedule does not know.
Compression pre-load and hydraulically held shelf stacks stay loaded after power is removed. The interlock that hid them is gone too.
Real isolation-point structure, illustrative tags, equipment that does not exist. Free to read and download. An example to learn from — not a document to adopt.
Turret tooling change on a high-containment rotary tablet press handling a potent compound. Covers compression pre-load, turret rotation, wash-in-place lines, and the pressure cascade that must hold throughout because it is the containment.
- 12 isolation points
- 3 must stay energised
- 3 with a stored-energy dwell
Shelf stack and condenser service inside a production freeze dryer. Covers hydraulic shelf collapse, clean steam sterilisation heat, silicone thermal fluid at temperature extremes, refrigerant, and vacuum that must be broken before the door.
- 12 isolation points
- 1 must stay energised
- 5 with a stored-energy dwell
The pressure cascade, dust extraction and room HVAC are recorded as points that must stay live and be verified live — not omitted and left to whoever knows.
A lyophiliser chamber is a permit-required confined space. The permit can be required by the procedure, and the work order cannot close while it is open.
Every execution pins the procedure version it ran against, so a validated change is auditable against what was actually performed.
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