Daily Process Safety Lessons
Practical learning for the decisions that protect people, the environment and the plant from major accidents. Each lesson develops an operational insight into a complete article with actions and a team discussion question.
Process Safety · 7 November 2026PHMSA proposes LNG standards and reporting changes. Review facility scope, technical evidence and current instructions before revising the operating basis.
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Process Safety · 6 November 2026NTSB’s preliminary Riley Loop report records two maintenance deaths. Review isolation evidence, contractor handovers and stop-work triggers without assuming a cause.
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Process Safety · The Prospector 5 sinking shows why jack-up preload, seabed uncertainty, monitoring, stop criteria and emergency readiness must operate as one system.
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Process Safety · CSB’s 19 October update highlights five unanswered Yenkin-Majestic recommendations. Review vessel integrity, safeguards and evidence of action closure.
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Lesson 58 · 9 min read · A diesel engine can ingest released hydrocarbon vapour, overspeed and ignite the cloud. Learn the FPSO barriers that stop gas ingress and runaway.
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Lesson 57 · 9 min read · H2S in FPSO cargo and slop tanks can exceed detector ranges and accumulate in low wind. Learn the monitoring and barrier actions that control exposure.
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Lesson 56 · 9 min read · Hydrate plugs can trap pressure, mislead instruments and move violently during removal. Learn how offshore teams prevent and control the hazard.
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Lesson 55 · 9 min read · Produced sand can rapidly erode bends, valves and fittings while disrupting instruments and shutdown functions. Learn how offshore teams manage the complete sand barrier.
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Lesson 54 · 10 min read · When a heat-exchanger tube fails, high-pressure fluid can rapidly enter the low-pressure side. Learn how design, relief, integrity and operations protect the connected system.
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Lesson 53 · 9 min read · A zero gauge indication alone may not prove a pig trap is depressurised. Learn how offshore teams verify venting, drainage and safe closure opening.
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Lesson 52 · 9 min read · Air entering hydrocarbon equipment during shutdown or startup can create an internal explosive mixture. Learn how offshore teams verify isolation, inerting and sequencing.
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Lesson 51 · 8 min read · Inspection evidence protects only when it changes the operating decision. Learn how offshore teams respond when equipment no longer meets its accepted basis.
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Lesson 50 · 8 min read · A flare protects only when released gas reaches a dependable ignition and combustion system. Learn how offshore teams manage pilot, purge and re-ignition barriers.
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Lesson 49 · 8 min read · Liquid entering a vapour-only system can overwhelm equipment and spread flammable material. Learn how offshore teams prevent, detect and stop carryover.
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Lesson 48 · 8 min read · Relief and blowdown systems protect equipment only when hazardous discharge reaches a safe, adequately sized disposal system. Learn how offshore teams verify the full path.
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Lesson 47 · 8 min read · Emergency isolation must close safely, on time and tightly enough to stop hazardous inventory feeding a release or fire. Learn how offshore teams verify ESD valves.
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Lesson 46 · 8 min read · An offshore temporary refuge protects people only while smoke, toxic gas, heat and blast are controlled. Learn how to verify enclosure and HVAC integrity.
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Lesson 45 · 8 min read · A firewater pump can run while poor distribution, blocked nozzles or inaccessible activation leaves equipment exposed. Learn how to verify offshore deluge performance.
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Lesson 44 · 8 min read · A detector head is only the first link in a fire-and-gas safety function. Learn how coverage, alarm, shutdown, testing and impairment control must work together.
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Lesson 43 · 8 min read · Dead-leg piping can trap a different environment from the flowing line and develop highly localised damage. Learn how to identify, inspect and control it.
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Lesson 42 · 8 min read · Corrosion under insulation can thin piping unseen until containment is lost. Learn how offshore teams identify susceptible locations, inspect effectively and close the integrity loop.
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Lesson 41 · 8 min read · A process upset can cool pressure equipment below its assessed temperature and increase brittle-fracture risk. Learn how offshore teams protect the pressure boundary.
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Lesson 40 · 8 min read · Gas blowby can overpressure downstream equipment after separator liquid level is lost. Learn how offshore teams protect lower-pressure systems.
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Lesson 39 · 8 min read · Chemical injection can create severe local corrosion at the pipe wall. Learn how offshore teams verify injection design, inspection coverage and integrity evidence.
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Lesson 38 · 8 min read · Vibration fatigue can break small-bore pressure connections. Learn how offshore teams assess branch loads, operating modes, supports and corrective work.
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Lesson 37 · 8 min read · Pyrophoric deposits can ignite when equipment is opened to air. Learn practical controls for sour-service maintenance, cleaning and waste handover.
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Lesson 36 · 8 min read · Temporary cabins can expose occupants to fire, explosion and toxic releases. Learn practical siting, occupancy and change-control checks for offshore teams.
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Lesson 35 · 8 min read · Learn how passive fire protection on structural supports limits fire escalation, and why damage assessment, repair compatibility and close-out evidence matter.
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Lesson 34 · 8 min read · Verify hose materials, assembly identity and service suitability before installation. Learn practical process-safety lessons from the CSB DPC chlorine investigation.
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Lesson 33 · 8 min read · A non-return valve shows the intended flow direction, but only suitable design, inspection, testing and verified isolation can establish protection against reverse flow.
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Lesson 32 · 7 min read · Condensate-induced water hammer can damage steam pipework. Learn how drainage, steam-trap maintenance and controlled restart protect containment.
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Lesson 31 · 8 min read · A liquid-filled section isolated between closed valves can overpressure as it warms. Learn how to identify blocked-in inventory and preserve a verified relief path.
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Lesson 30 · 7 min read · Drainage must manage rainwater and minor leakage without carrying hazardous material beyond secondary containment. Learn why drain status is a process-safety decision.
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Lesson 29 · 7 min read · Nitrogen can prevent fire and explosion by displacing oxygen, but the same property can create an invisible asphyxiation hazard outside the equipment boundary.
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Lesson 28 · 7 min read · A control-room indication may confirm an actuator or limit switch without proving that a valve has isolated flow. Learn how to verify the function that the process actually needs.
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Lesson 27 · 7 min read · A clamp, enclosure or composite repair changes the pressure boundary and must have an engineered basis, operating limits, monitoring and a firm replacement plan.
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Lesson 26 · 7 min read · A stable transmitter value does not prove that the process connection is open, representative and leak-tight. Learn why impulse lines must be treated as part of the safety function.
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Lesson 25 · 7 min read · Loss of power, instrument air, cooling or another utility can disable several controls at once. Learn how to verify that a process can reach and remain in a safe state.
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Lesson 24 · 7 min read · High temperature hydrogen attack can weaken a carbon-steel exchanger internally. Verify actual hydrogen-service conditions, select resistant materials and limit exposure during nonroutine work.
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Lesson 23 · 7 min read · Liquid nitrogen can displace oxygen beyond the visible fog. Prevent single-point overflow, ventilate the credible release, monitor oxygen and isolate from a safe location.
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Lesson 22 · 7 min read · When reaction heat exceeds cooling capacity, rising temperature can accelerate the chemistry and overwhelm the equipment. Control the runaway case before the batch begins.
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Lesson 21 · 7 min read · A zero reading at the workface cannot prove that a nearby tank or connected system is safe. Identify hidden fuel spaces, eliminate hazardous atmospheres and make every test representative.
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Lesson 20 · 7 min read · Dust hidden on beams, cable trays and equipment can be lifted by a small blast and fuel cascading secondary explosions. Control releases, inspect elevated surfaces and remove deposits safely.
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Lesson 19 · 6 min read · During a toxic release, an urgent call for help does not make entry safe. Protect rescuers through early warning, controlled hot zones, accountability, monitoring and trained response.
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Lesson 18 · 6 min read · An unloading connection can fit and still lead to an incompatible chemical. Verify the product, line and receiving tank together before transfer begins.
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Lesson 17 · 6 min read · Flammable liquid transfer can charge the liquid itself. Bonding and grounding matter, but low-conductivity products may need additional controls before filling starts.
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Lesson 16 · 5 min read · A pipe-cleaning or purging job can become a major-accident hazard when flammable gas is deliberately discharged where people work. Engineer the method and discharge destination before commissioning begins.
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Lesson 15 · 5 min read · A filling tank needs more than a plausible level display. Independent warning and a reliable way to stop or divert flow are critical when the primary indication fails.
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Lesson 14 · 5 min read · A fastener that looks like part of an actuator may actually retain the process pressure boundary. Before work starts, the team must know exactly what each proposed removal will open.
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Lesson 13 · 4 min read · A relief valve can open exactly as designed and still produce a major accident if the discharged material reaches people or an ignition source.
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Lesson 12 · 4 min read · An idle pump and its connected pipework can retain reactive material. Removing equipment from service may create a stagnant dead leg with a hazard that grows while nobody is operating it.
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Lesson 11 · 4 min read · Pressure protection depends on a continuous, verified path from the equipment to its relief device. A closed block valve can silently defeat that barrier.
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Lesson 10 · 7 min read · Individually authorised jobs can interact and create a hazard that no single permit fully describes. Learn how a shared operating picture, explicit interfaces and controlled change keep simultaneous offshore work within an approved risk envelope.
Read the full lesson →Lesson 9 · 7 min read · A safe shift handover must transfer the plant's actual condition, changing risks and unfinished actions—not merely recount the work completed. Learn how preparation, two-way exchange and cross-checking protect continuity offshore.
Read the full lesson →Lesson 8 · 7 min read · Startup places equipment, safeguards and people in changing conditions. Learn why readiness must be proved, deviations must be acted on early, and production pressure must never replace the approved startup sequence.
Read the full lesson →Lesson 7 · 7 min read · Stable readings and an absence of visible leakage cannot confirm that pressure equipment, piping and protective devices remain fit for service. Learn why inspection evidence, defect control and disciplined escalation are essential barriers against loss of containment.
Read the full lesson →Lesson 6 · 7 min read · Temporary hoses, revised line-ups, software adjustments and altered procedures can change major-accident risk even when the work looks minor. Learn how disciplined management of change keeps the technical basis, safeguards, documents and people aligned.
Read the full lesson →Lesson 5 · 7 min read · A marked valve, signed certificate or closed permit cannot by itself prove that hazardous energy and process inventory are controlled. Learn why offshore isolation depends on correct design, physical verification, monitored integrity and disciplined reinstatement.
Read the full lesson →Lesson 4 · 6 min read · Alarms must help operators recognise abnormal conditions and take timely action. Learn why nuisance alarms, standing alarms and alarm floods weaken that purpose—and what an offshore team can do about them.
Read the full lesson →Lesson 3 · 6 min read · Operating limits define where an approved response is required. Learn why teams must recognise developing deviation, act through the procedure and resist allowing temporary excursions to become normal practice.
Read the full lesson →Lesson 2 · 6 min read · A temporary bypass changes the protection available during an upset. Learn how to assess the affected hazard, authorise restrictions, maintain clear handovers and verify restoration before closing the impairment.
Read the full lesson →Lesson 1 · 6 min read · Normal process readings tell us how the plant is operating now. They do not prove that its safeguards are ready for an upset. Learn how barrier status, controlled impairments and clear handovers support sound operational decisions.
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General learning supports approved site procedures, installation-specific safety requirements and competent technical advice.
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