Permit to work system for Indian plants: hot work, height, confined space and electrical
A permit to work system that works on the shop floor: permit types, the checklist before approval, validity, suspension, close-out and the register to keep.
Last checked 6 min read
Most serious accidents in Indian plants do not happen during normal production. They happen during maintenance: a welder working near a solvent line, a fitter inside a tank, an electrician on a panel someone thought was off. A permit to work system exists for these moments. It forces a pause before the job starts, a check that the hazards are controlled, and a second check when the job ends.
Why a permit to work system matters
Production work is repeated every day by the same people, with controls built into the process. Maintenance and project work is different: it is done by fewer people, often contractors, in unusual places, at odd hours. The hazards are not obvious to the people around them.
A permit makes three things explicit:
- What work is being done, where and by whom.
- What hazards have been identified, and what controls are in place.
- Who approved it, for how long, and who confirmed the area was safe at the end.
The OSH Code, which replaced the Factories Act from 21 November 2025, and the rules and standards made under it set out duties for dangerous operations, confined spaces and the safety of everyone on site. Your state's rules and your licence conditions may specify more. Check with your safety consultant which permits are mandatory at your site, and set the rest by your own risk assessment.
The four permit types most plants need
| Permit | Typical jobs | Key controls |
|---|---|---|
| Hot work permit | Welding, gas cutting, grinding near flammables | Gas test, combustibles removed or covered, fire extinguisher at hand, fire watch during and after |
| Work at height | Roof work, pipe racks, scaffolds | Fall protection, inspected scaffold or ladder, area below barricaded |
| Confined space entry permit | Tanks, pits, silos, ducts | Isolation, ventilation, gas test before and during, standby person outside, rescue plan |
| Electrical | Panel work, cable jointing | Lockout tagout, test for dead, authorised electrician |
Some plants add excavation, crane lifts, radiography or work on process lines. Start with the four above, and add a type only when it needs its own checklist.
The checklist comes before the signature
A permit is only as good as its checklist. Each permit type should have a short, specific list that must be completed before the permit can go for approval. For a hot work permit in a chemical plant, for example:
- the area around the job (many sites use 11 metres) cleared of combustibles, or covered with fire blankets;
- drains and openings covered;
- gas test done, flammable reading recorded;
- fire extinguisher of the right type at the job;
- fire watch named, to stay for at least 30 minutes after work ends;
- welding machine and cables inspected;
- PPE: face shield, leather gloves, apron.
The person asking for the permit ticks each item, the approver checks them on site, not from the office. A checklist ticked at a desk is a form, not a control.
Lockout tagout
For electrical and mechanical work, isolation is the single most important control. Lockout tagout means each person working on the equipment puts their own lock on the isolation point and keeps the key; a tag says who and why. The equipment is then tested to confirm it is dead before work starts. Nobody removes another person's lock.
Confined space entry
Tanks and pits kill rescuers as often as workers. A confined space entry permit should require the atmosphere to be tested before entry and at intervals, with readings recorded; continuous ventilation; a standby person outside who never enters; and a rescue plan with equipment at the entry point. Oxygen and gas limits should come from your site standard and the applicable rules.
Validity, suspension and handover
- Validity: a permit should not outlast the shift; 8 to 12 hours is common. A 12-hour ceiling stops permits being left open for days.
- Suspension: if a gas alarm sounds, the weather turns or an emergency is declared, the permit is suspended and work stops. It resumes only after a recheck.
- Handover: if the job continues into the next shift, the outgoing and incoming supervisors walk the site together and the permit is either closed and reissued or formally handed over.
Close-out: the step people skip
When the job is done, the area must be returned to normal:
- work stopped and tools removed;
- area cleaned, with hot work areas checked again after the fire watch;
- isolations and locks removed by the people who put them on;
- everyone who entered accounted for, especially in confined spaces;
- equipment handed back to operations, in writing.
A permit that is approved but never closed is a warning sign. Review open permits at every shift meeting.
A worked example from a Vapi chemical plant
A contractor needs to weld a support bracket on a pipe rack 4 metres above ground, 9 metres from a solvent storage tank.
- Permits: hot work and work at height, cross-referenced.
- Checks: gas test near the tank (no flammable reading), combustibles cleared, fire blankets over the drain, two extinguishers placed, scaffold inspected and tagged, harnesses checked.
- Approval: the area in charge and the safety officer, on site, at 9:40 am. Valid until 5:30 pm.
- At 1:15 pm: a tanker starts unloading solvent nearby. The permit is suspended and welding stops. After unloading and a fresh gas test, it resumes at 2:30 pm.
- Close-out at 4:50 pm: fire watch stays until 5:20 pm, area checked, scaffold left tagged for the next day. The contractor's two welders are confirmed out.
The contractor's workers had completed the site safety induction the week before, which is a condition for their cards to work at the gate. Our guide to contract labour compliance under the OSH Code covers the principal employer's wider duties for such workers.
Keep a permit register
The permit register is your record that the system works: every permit, its type, location, people, times, approvals, suspensions and closure. Review it monthly for:
- permits closed late or never closed;
- jobs done without a permit (cross-check against maintenance work orders);
- the same contractor or area appearing again and again;
- suspensions and their causes.
Permits also matter in an emergency. If the alarm goes off, the incident controller should know who is inside a tank or up a rack right now; our post on the emergency muster roll call explains how to account for everyone.
Checklist
- Permit types defined, each with its own checklist.
- Approvers trained and named for each type.
- Checks verified on site, not at a desk.
- Validity no longer than a shift, with suspension and handover rules.
- Close-out with isolations removed and people accounted for.
- A monthly review of the permit register.
In Vatsin Safety, permits to work cover the types your company chooses, every checklist item must be ticked before approval, permits last at most 12 hours by default, can be suspended and resumed, need a closing check, and the full register downloads as a CSV.