- Shut off the power source and isolate all hydraulic or pneumatic supply lines.
- Depressurise the system fully using the correct bleed-down procedure.
- Bleed accumulators separately — they hold pressure independently of the main system.
- Verify zero pressure on the system gauge before opening any connections.
- Apply lock out tag out devices to all isolation points after depressurising.
- Wear face and hand protection when working near pressurised fittings.
- Use the manufacturer's manual for system-specific isolation steps.
- Block or prop hydraulic rams to prevent gravity-induced movement after isolation.
- Inspect hoses and fittings for damage or leaks before re-pressurising.
- Record the isolation on the permit and inform all affected personnel.
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- DON'T assume a hydraulic system is safe because the engine is off.
- DON'T run your hand over hydraulic hoses to check for leaks.
- DON'T open fittings or connections without confirming zero pressure first.
- DON'T stand under hydraulic rams without mechanical props in place.
- DON'T use compressed air to clean clothing, skin, or the work area.
- DON'T forget to bleed accumulators — they hold pressure after shut-down.
- DON'T attempt hydraulic isolation without proper training and competence.
- DON'T re-pressurise a system without removing all locks and tags first.
- DON'T ignore small leaks — pinhole jets can penetrate skin unseen.
- DON'T bypass pressure relief valves or safety devices for any reason.
See also: Lock Out Tag Out Awareness | Mechanical Isolation
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