Confined-Space Entry Under Production Pressure

Stop the entry and do not sign or extend the permit. The decision is not a close call: the atmosphere is still at 12% LEL, above the usual 10% LEL entry limit, and oxygen at 19.1% is below the normal 19.5% minimum. The meter's calibration is eight months old and the certificate is missing, so the readings cannot be relied on for a safe-entry decision. The permit has expired, the blower is not suitable for a flammable atmosphere, and a rope tied to a handrail is not a tested rescue plan. A headache and a plan to 'hold his breath' are warning signs, not reassurance. The supervisor should withdraw the crew, barricade the manhole, keep ignition sources out, inform the plant manager in writing, and require a competent gas test with a calibrated meter, isolation, ventilation and a standby/rescue plan before any new permit is considered. Production loss does not override the stop-work decision.

First, eliminate the entry if possible: clean the tank by a remote or external method, or schedule it for a shutdown when it can be fully drained, isolated and ventilated. If entry is still necessary, engineer the controls: isolate and lock off all product and energy sources, drain and purge, use intrinsically safe ventilation positioned to avoid recirculation, and provide continuous gas monitoring for flammable gas, oxygen and the specific solvent vapour. Administrative controls come next: a new confined-space permit issued by a competent person, a documented gas test immediately before entry and repeated during work, a trained entry supervisor, a standby person, a communication method and a rescue plan with practised rescuers and retrieval equipment. PPE is the last layer, not the first: appropriate respiratory protection, chemical-resistant clothing and a harness with a retrieval line where practicable. The risk assessment should record who is exposed, the worst credible outcome and the residual risk after each control.

The plant manager should treat the aborted entry as a near miss and stop all confined-space work until the programme is checked. Immediate actions: confirm the crew is accounted for, arrange medical review for the fitter with headache, secure the area and confirm that no one has entered. The rescue plan must be replaced with a site-specific plan: trained rescuers, retrieval equipment, breathing apparatus if rescue may need entry, and a practice drill; the fire service should not be the only plan. Competence: verify that the entry supervisor, gas tester, standby person and rescuers are trained and authorised, and that the gas meter is calibrated and bump-tested. The manager should also address the production pressure that encouraged the shortcut, review permit audits, and record the decision. Blaming the fitter alone would miss the system failure.