Tag
#safety
20 topics across all disciplines.
Relief and flare systems — what happens when pressure wins
How relief scenarios are worked out, why the governing case is rarely the obvious one, and why nearly every part of a flare exists to stop it becoming the hazard it was built to remove.
Fired heaters — an open flame next to a hydrocarbon inventory
How a furnace is arranged, why the process fluid and flue gas travel in opposite directions, what draught and excess air actually control, and why the purge before light-off is never negotiable.
Valve types — picking one for the duty, not the drawing
Gate, globe, ball, butterfly and check valves explained by what each is built to do. Why throttling with a gate valve destroys it, what double block and bleed means, and how check valves slam.
Valve actuation and fail position — deciding what happens when everything stops
Pneumatic, electric and hydraulic actuators, why a spring is what makes fail-safe possible, how fail open and fail closed are chosen per service, and what a positioner actually does.
Vessels, exchangers and relief devices — the static equipment
What MAWP means and why it matters more than design pressure, how heat exchanger types differ, and why the relief device is the one protection that cannot be bypassed.
Storage tanks — the simplest equipment with the largest consequences
Why the vapour space is the whole design question, how a tank breathes, why overfill protection must be independent of the gauge, and why a tank is far weaker against vacuum than pressure.
Compressors — surge, staging and the machine you cannot replace quickly
Why gas is harder than liquid, what surge actually does to a centrifugal compressor, why compression is staged with intercooling, and why liquid in a suction line is catastrophic.
Hazardous areas — zones, gas groups and Ex protection explained
Why a light fitting in a refinery costs ten times a normal one. Zones and divisions, gas groups, temperature classes, IP ratings, and how to read an Ex certification label.
Lighting and small power — the systems people only notice when they fail
How lighting levels are set and why uniformity matters more than average lux, the three tiers of emergency lighting, and why a socket outlet in a hazardous area is not a simple thing.
Earthing and bonding — several different jobs sharing one word
Why a plant has more than one earth, the difference between earthing and bonding, how the neutral earthing decision shapes the whole system, and why static bonding has almost nothing to do with fault current.
Distribution and the single line diagram — the map of the electrical system
How power gets from the grid to a motor, what transformers and switchgear actually do, why protection must discriminate, and how to trace a supply on a single line diagram.
Plant layout, paving and drainage — decisions you cannot undo later
What a plot plan is actually deciding, why paving and slopes matter more than they look, and why a plant has four separate drainage systems that must never meet.
Underground services and excavation — the part of the plant nobody can see
What is buried under a plant and how it is protected, why trench collapse is the hazard that kills, and why backfill compaction decides whether a road is still level in ten years.
Buildings and shelters — designed for the day everything goes wrong
Why plant buildings are sited by risk assessment rather than convenience, what blast resistance actually requires, and why a building can survive the explosion and still kill everyone inside.
Safety instrumented systems and SIL — the layer that acts on its own
Why protection is kept separate from control, what a SIL number actually measures, how voting trades spurious trips against missed ones, and why a bypass left in is the classic failure.
Risk assessment and the hierarchy of control
The difference between a hazard and a risk, why PPE is last and what that actually means on site, how a job safety analysis differs from a site risk assessment, why a high near-miss reporting rate is a good sign, and what stop work authority costs the first time somebody uses it.
Permit to work — how a plant decides a job is safe to start
What a permit actually is and what it is not, why proving an isolation matters more than making one, why confined spaces kill rescuers, and the ways a permit system quietly becomes paperwork.
Working at height and lifting operations
Why preventing a fall beats arresting one, what suspension trauma does to somebody hanging in a harness, why a scaffold tag matters more than how the scaffold looks, how sling angle multiplies the load in each leg, and why nobody stands under a suspended load however short the lift.
Occupational health — substances, H2S and working in heat
Why hydrogen sulphide becomes more dangerous as the smell disappears, what an exposure limit actually means, why a filter respirator is useless in an oxygen-deficient atmosphere, how silica and welding fume do their damage silently, and why heat stroke is a medical emergency rather than a bad afternoon.
Emergency response and site welfare
Why muster points are chosen against the prevailing wind, what a headcount is actually for, why drills exist to find the problems rather than to demonstrate compliance, what a medical evacuation plan has to settle in advance, and why camp welfare is a safety matter rather than a comfort one.