Hot Dip Galvanising Insurance

The event that defines galvanising safety is a kettle explosion, and it almost always traces to a sealed void.

Steel going into the bath has been through fluxing and is wet. If a hollow section is closed at both ends, or a cavity cannot drain, the liquid trapped inside turns to steam instantly in 450 degree zinc and the pressure has to go somewhere. The result is zinc ejected from the bath across the working area. The same thing happens with a section that looks vented but has a blocked hole, a jig that trapped flux, or a fabrication with an internal baffle nobody could see from outside.

So the control is upstream of the kettle: inspection of every item before dipping, with venting and drainage confirmed rather than assumed, and a willingness to reject work. That is a commercial conversation as well as a safety one, because a customer whose fabrication is rejected is delayed and unhappy. Agree venting responsibilities in your terms of trade in writing, give customers clear guidance before they fabricate, and never dip something you are unsure about because a job is urgent. The explosion is not survivable as a business event if somebody is standing there.

The commercial claims here are about other people's fabrications, and standard liability cover excludes exactly that.

A galvaniser's yard holds steelwork belonging to fabricators, with each batch representing days or weeks of cutting, welding and drilling, frequently with a site programme behind it. Damage it by dropping it, lose it, distort it in the bath, or coat it badly, and the customer's loss is not the steel price: it is remaking a fabrication and the delay to whatever it was going into. A general public liability wording excludes damage to property in the insured's care, custody or control, which is all of it.

So confirm that cover specifically, set the limit against a busy week rather than an average, and understand how distortion is treated. Distortion is the recurring argument in the trade: thin sections, long asymmetric pieces and welded assemblies with locked in stress will move in a 450 degree bath, and sometimes that is unavoidable physics rather than a processing error. Guidance to customers at quotation stage about design for galvanising is both good service and a defence.

Before anything reaches the zinc it goes through chemistry, and that half of the plant carries the pollution and health exposures.

Degreasing, acid pickling and fluxing tanks hold substantial volumes, and the realistic incidents are a tank or liner failure, a bund that was full of rainwater when a leak happened, a transfer spill, and acid reaching a drain or the ground. That is a clean-up with a regulator attached rather than a stock loss, and it is worth checking how the policy treats gradual as well as sudden pollution, because a slow leak under a tank is the gradual kind many wordings exclude.

The health side is fume and splash. Acid mist, zinc fume and ammonium chloride from fluxing all require extraction that works rather than exists, and the splash risk from immersion work needs protection that people actually wear in a hot building. Expect an underwriter to ask about tank integrity testing, bunding and its drainage, extraction maintenance, and health surveillance. Those questions are the same ones that prevent the incidents.

Most businesses can trade at reduced capacity after a property loss. A single kettle plant cannot.

A galvanising line is built around one bath. Lose the kettle to a leak, a crack or a furnace failure and there is no reduced output, there is no output, and customers go elsewhere immediately because their steel still needs coating. Replacement is not a matter of ordering a tank: it is a kettle, a furnace, a lining, installation, commissioning and a slow heat up, with lead times measured in months. Meanwhile the fixed costs continue and the customer base erodes.

Which makes business interruption the most important part of the placement rather than an add-on, and the indemnity period the number to argue about. Twelve months is frequently too short. Set it against a realistic replacement and commissioning programme, consider whether subcontracting to another plant is genuinely available at your volumes, and make sure the sum insured reflects current plant cost rather than a figure set years ago. A galvaniser underinsured on business interruption is the clearest version of a solvable risk left unsolved.

Molten metal and the indemnity period decide this one. We are an FCA regulated broker and will not tell you we are the best choice. These are the questions that decide it.