Rigs, tanks and terminals — lockout alongside permits, not instead of them.
A rig down for relocation is the largest routine lockout in the industry: drawworks, mud pumps, top drive, generators, hydraulics, pneumatics, and the accumulator that must be bled before anything else. Eighteen points is normal.
Tank and terminal work adds hot work and confined-space entry on top of energy isolation. Welding a nozzle on a storage tank is three permits and a lockout, and the sequence between them matters: the permit should not issue until the isolation is verified.
API RP 54 and RP 2003 sit alongside 1910.147 here, and the record has to show all of it.
Electrical and hydraulic supply isolated; the accumulator still holds 3,000 psi and the BOP function fires.
The welder has a permit, the fire watch is posted, and the product line into the tank was never blinded.
An eight-hour permit on a twelve-hour job. Nobody noticed; the record says the work was permitted.
Real isolation-point structure, illustrative tags, equipment that does not exist. Free to read and download. An example to learn from — not a document to adopt.
Full rig de-energisation prior to rig down and move. Spans SCR house, drawworks, top drive, mud pump, BOP and mast. Multi-shift.
- 18 isolation points
- 3 must stay energised
- 1 with a stored-energy dwell
Also applies: API RP 54
Read the examplePressure relief valve replacement on a three-phase production separator in sour service. Covers double block and bleed, depressurisation, H2S purge and the protection that must remain in service while the relief path is open.
- 11 isolation points
- 3 must stay energised
- 3 with a stored-energy dwell
Weld repair to the 6in outlet nozzle on TK-401. NFPA 51B hot work. Fire watch 30 minutes after work stops.
- 10 isolation points
- 1 must stay energised
Also applies: 29 CFR 1910.252 and NFPA 51B · 29 CFR 1910.146
Read the exampleLoading arm seal replacement at a gasoline truck rack. Covers product header isolation under static head, vapour recovery return, the grounding and overfill interlocks that must stay in service, and hot work in a vapour zone.
- 12 isolation points
- 4 must stay energised
- 3 with a stored-energy dwell
Master valve change on a two-phase geothermal production wellhead. Covers a reservoir that cannot be switched off, quench and kill lines, silica-scaled valves that may not seat, flashing brine and hydrogen sulphide.
- 12 isolation points
- 6 must stay energised
- 1 cannot be isolated — managed by other means
- 3 with a stored-energy dwell
A procedure can require a hot-work or confined-space permit; the first isolation step is refused until it is issued, and the work order cannot close while it is open.
When a permit expires mid-job the work order goes on hold with the reason stated. Resuming is a deliberate act.
The accumulator bleed carries a required dwell before the next step is offered.
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