A tanker of toluene is at the gantry and the driver is restless. The loading hand drops the dip pipe, opens the valve and walks back to the panel. The bonding clamp hangs on its hook a metre away. Most days nothing happens. On the day the air is dry and the flow is fast, a spark jumps from the tanker shell, and the vapour above the hatch does the rest.
The solvent manufacturers page ranks this hazard above all its other strains. Earthing rules are painted on walls across such plants. What decides whether they work is whether each person clips on, every transfer, including the hurried ones.
Where the clip gets skipped
- Tanker gantry. The driver wants to leave; the loader is handling two vehicles at once.
- Drum filling bay. Drums arrive on pallets, and clipping each one feels slow when the target is hundreds per shift.
- Hose transfers in the tank farm. A temporary hose between two tanks is coupled for a short job and never bonded across the flange. Elsewhere, splash filling replaces the dip pipe because the pipe has gone missing.
- IBC and can decanting. A plastic container on a steel floor, filled by gravity, with no earthing point anyone thought about.
- Sample drawing. A lab analyst fills a bottle from the still outlet wearing a polyester shirt instead of cotton overalls and antistatic shoes.
- Broken equipment. A clamp with a cracked jaw or an earthing relay that shows green without a connection, so people stop trusting it.
Why good people skip it
Few operators set out to take a risk. The skip has causes. Pressure from the dispatch desk to clear the gantry is the commonest one. Equipment faults come next: if the clamp is hard to open or the indicator lies, people work around it. Outside drivers bring the habits of every other plant they visit, and most were never told how this one works.
Then there is the quiet year. A site that has passed many months without a flash teaches its crew that the clip is a formality. New joiners copy the seniors, so a shortcut becomes the method within one hiring cycle. And where discipline is inconsistent, one supervisor shouting and another ignoring, the step ends up hanging on which in-charge holds the roster that night.
What it costs
The worst outcome needs no description at a flammable-liquid site. Below that sit near misses nobody logs and an insurer asking hard questions. A customer's tanker may be held for an investigation, and operators may leave after a scare. A solvent plant with a reputation for fires struggles to hire experienced still operators at all.
Building the habit, person by person
- 1
Teach it standing at the gantry
Induction for every new hand includes clipping on at the gantry, the drum line and a hose transfer, with a senior watching. The person repeats it unprompted before being signed off.
- 2
Brief every outside driver at the gate
A short standard briefing and a gate log, with a single gatekeeper per shift answerable for it. The gantry and permit routine for distillers shows how the briefing, escort and log fit together.
- 3
Name a checker each shift
The shift in-charge or loading lead walks the gantry and the drum bay at set points and looks only at bonding. Short, frequent checks beat long, rare audits.
- 4
Fix equipment the same day
A broken clamp, a frayed bonding lead or a doubtful relay is tagged and repaired before the next transfer. Maintenance keeps the earth pit resistance test in date. People keep a habit only when the kit lets them.
- 5
Write a fair discipline route
A missed clip is serious, and the response is the same on every shift: record facts, talk to the person, retrain, and escalate on repeat. Our notes on written rules for thinner and solvent units cover keeping such rules short and consistent.
- 6
Thank people who stop a transfer
Anyone who halts a loading because bonding is missing earns public thanks at the next briefing, even if a tanker waited.
Rosters, fatigue and the drum bay
A tired person misses steps. Long shifts in a noisy, vapour-laden drum bay make it worse. Swap people out of the bay on a fixed clock and keep enough hands on the gantry at peak hours so one loader is not juggling two tankers. The rota rules for solvent manufacturers also reserve a handover slot, so open permits and partly filled tanks are passed on in person.
Start with three checks
Give an hour at the gantry to counting bonded transfers against unbonded ones. Ask the last three joiners to show you how they clip on a drum. Test every clamp and relay with the maintenance fitter. What you see will point to training, kit or supervision as the first lever. For loading and changeover risks elsewhere in the group, read the main page for chemical makers alongside this one. To plan induction, gantry briefings and supervisor coaching together, tell us how your tank farm runs.
