A plant runs machinery, holds materials, brings contractors on site and employs people in the same space — and each of those answers to a different safety regime.
We work in plants where safety has outgrown one person remembering everything. Usually we come in when a production line has expanded, when contractors are coming and going without a framework, or when an inspection is approaching — and we build an order that can be maintained after we leave.
A guard removed for maintenance and not refitted, an emergency stop blocked by a trolley, a sensor defeated to keep up with the rate. This erosion does not happen in a day and so is not visible in a day — it is found on a walk, not on a form.
Welding, work at height, confined space entry and energy isolation are usually done by people who do not know the site. Without a proper induction and a permit, the site is relying on the judgement of whoever has spent least time in it.
Noise, fumes and environmental conditions do harm over time rather than in a moment. Nobody complains about 92 decibels, so exposure is measured rather than reported — and the person exposed is not necessarily the one standing at the loud machine.
Most plants prepare a plan and do not maintain it. The difference between a plan and a list of subjects is an owner, a target date and evidence of closure — and without a monthly review it loses its value within a quarter.
In a plant the domains are not separate. Hot work next to flammable material is safety and fire; a solvent tank is hazardous materials and environment; noise from a production line is hygiene and also the engineering of its source. We treat them as one system because that is how they behave on the floor.
When a new process, piece of equipment or material comes in; after an accident or significant near miss; before a planned inspection; and when headcount or contractor volume has grown enough to change the picture.