Permit to Work is the safety control that authorises hazardous maintenance activities. When PTW lives in paper forms or a separate system, things slip, work starts without permits, permits expire mid-job, incidents get traced back to PTW process gaps. Integrating PTW into the CMMS closes those gaps.
What activities need a PTW
PTW is required for activities with elevated safety risk:
- Hot Work, welding, cutting, brazing, grinding
- Confined Space Entry, tanks, vaults, pits
- Working at Height, roofs, scaffolding, elevated platforms
- Electrical Isolation / LOTO, live panels, lockout/tagout
- Excavation, ground-penetrating work
- Any high-risk activity defined by local HSE policy
The PTW process inside the CMMS
- Supervisor identifies PTW need based on work order scope.
- PTW request raised in CAFM/CMMS with work details, location, and hazards identified.
- HSE team or authorised approver reviews and approves (or rejects with comments).
- PTW issued with validity window, safety requirements, and conditions.
- Work executed under PTW conditions.
- PTW closed when work completes and area is confirmed safe.
PTW record attributes
- PTW Reference Number
- Linked Work Order
- PTW Type (Hot Work, Confined Space, etc.)
- Location and Area
- Requesting Person
- Approving Authority
- Start Date/Time and End Date/Time
- Safety Precautions / Requirements
- Status (Requested, Approved, Active, Closed, Expired)
How PTW integrates with Work Order flow
The critical control
Work orders requiring PTW cannot progress to "In Progress" until PTW is approved. The CMMS blocks the status transition. Technicians physically cannot start hazardous work without explicit permission. This is the whole point of PTW, enforce it at the system level, not by hoping people follow procedure.
The integration rules:
- PTW requirement flagged during WO creation or planning
- WO status transitions blocked until PTW approved
- SLA timer can pause while PTW is pending (configurable)
- PTW expiry triggers alerts to supervisor and technician
- WO closure requires PTW closure confirmation
PTW checklists by type
Each PTW type should have its own safety checklist bundled into the permit:
- Hot Work: combustibles removed, extinguisher on site, fire watch assigned, area ventilated
- Confined Space: atmosphere tested, attendant assigned, rescue plan in place, communication established
- Height Work: fall protection verified, tools tethered, exclusion zone established
- LOTO: energy isolation verified, locks applied, test-for-zero-energy complete
- Excavation: utilities located, shoring in place, atmosphere tested if deep
PTW expiry and renewal
PTWs are time-bounded. A permit issued for a 4-hour window cannot be used the next day. The system must:
- Alert before expiry (e.g., 30 minutes before end time)
- Block new work under an expired permit
- Support permit renewal workflow if work continues
- Auto-close expired permits at cutoff
Incident and near-miss reporting
Every PTW-related incident or near-miss should be loggable against the permit and associated work order. Over time, this data shows which PTW types have the most incidents, where process gaps exist, and which teams need refresher training.
Conclusion
PTW is not paperwork. It's the control that keeps your team alive. Integrating it into the CMMS eliminates the gap between "we have a PTW process" and "our PTW process actually gets followed on every hazardous job." The system enforces the rule, logs the evidence, and leaves nothing to memory.
Written by Muhammad Abbas
Enterprise integration specialist with experience integrating HSE and PTW workflows into CMMS platforms.
