A do not airlock checklist prevents accidental pressure loss and contamination when transitioning personnel or equipment between pressurized zones. This structured approach clarifies responsibilities, hardware checks, and communication steps.
Use this guide to standardize procedures, reduce risk, and maintain compliance in facilities that rely on secure vestibule entry.
| Phase | Key Action | Responsible Role | Verification Method |
|---|---|---|---|
| Preparation | Review task, confirm authorization, check weather and system status | Operations Lead | Signed checklist and email/chat confirmation |
| Hardware Checks | Inspect seals, hinges, latches, interlocks, sensors, alarms | Maintenance Technician | Functional test log entry |
| Operational Sequence | Stagger entry, verify pressure differentials, confirm door status | Facility Supervisor | Pressure gauge read and door sensor status |
| Post-Entry Closeout | Lock doors, log completion, report anomalies, reset systems | Assigned Operator | Closed checklist entry in CMMS |
Pre Airlock Preparation
Before any transition, confirm that the environment is stable, the task is authorized, and all required tools and documentation are available.
Pre-Flight Verification
Verify permits, training records, and system status dashboards to ensure no active alarms or maintenance holds.
Hardware and Seal Inspection
Physical integrity of doors, seals, and interlocks is the backbone of airlock safety. Inspect each component methodically.
Mechanical Checks
Examine door frames, gaskets, hinges, and locking mechanisms for wear, debris, or damage that could compromise sealing.
Operational Sequence and Controls
Execution discipline keeps pressure zones managed and prevents cross contamination or pressure spikes.
Step by Step Procedure
Open inner door only when pressure delta is confirmed, restrict simultaneous opening, and use interlocks to enforce safe sequencing.
Post Entry Closeout
Closing procedures lock down the transition and provide traceability for audits and incident reviews.
Final Actions
Secure all doors, log timestamps and anomalies, and update maintenance records to complete the loop.
Key Implementation Recommendations
- Use a pre-filled digital checklist linked to sensor data to reduce manual errors.
- Assign clear roles for preparation, inspection, operation, and closeout.
- Schedule recurring hardware tests and training refreshers.
- Integrate checklist completion with your CMMS for audit trails and trend analysis.
- Define escalation paths for alarms, anomalies, or overdue verifications.
FAQ
Reader questions
How do I confirm pressure differential before opening an inner door?
Check calibrated gauges or digital sensors in the vestibule control panel; verify that the reading matches the approved transition range before proceeding.
What should I do if an interlock alarm sounds during entry?
Pause the transition, document the alarm, verify door and sensor states, and contact maintenance before overriding any safety logic.
Who is responsible for documenting the checklist completion?
The assigned operator records time, signatures, and any deviations in the central log or CMMS to ensure traceability and compliance.
How often should seals and interlocks be tested and validated?
Follow the facility maintenance schedule, typically weekly for functional tests and quarterly for full calibration and certification checks.