COSHH Risk Assessment for Wind Turbine Cleaning

COSHH requires employers to assess the risk from hazardous substances, prevent or adequately control exposure, and keep those controls working. For cleaning chemistry that means the assessment has to look at the product as it is actually used: at the right dilution, in the real space, by the people who will use it, for the length of time the task takes.

It also covers biological agents. HSE guidance explains that COSHH applies to incidental exposure to biological agents during work activities or because of the work environment. For turbine cleaning that is directly relevant, because the mould, mildew and biofilm being removed are themselves part of what technicians may be exposed to during the task.

A turbine interior changes the exposure maths. HSE's confined spaces guidance notes that some spaces are confined by their nature and others become confined because of the work being done. Cleaning is squarely in the second category: it introduces chemistry, can disturb residue, and often extends the time a technician spends in a poorly ventilated space.

That is why solvent-based products are hard to defend inside a nacelle. A cleaner with a high volatile-organic-compound load or a flash point brings flammability and inhalation risks into a space you cannot easily ventilate. A water-based, non-flammable, low-odour product removes several of those problems before the assessment even starts, which is one reason the safety and compliance profile matters as much as the cleaning performance.

The safety data sheet is the starting point, not the finish. A defensible assessment reads the SDS for hazard classification, then checks the substances against workplace exposure limits. The limits published in HSE's EH40 are the reference point, and a product whose components sit comfortably below those limits at use dilution is far easier to control and to justify.

This is also where product choice quietly decides how much control effort you need. A cleaner with no substances of very high concern, no persistent organic pollutants and a low-odour profile at use dilution shifts the assessment from managing a hazard to confirming a low one. The pre-trial version of this work, including what to gather before a first application, is covered in the COSHH assessment before a trial.

Under the hierarchy of control, substitution sits above personal protective equipment. Choosing a lower-hazard cleaning product is a substitution-level control, and it should be recorded as such rather than jumping straight to respiratory protection. PPE still has a role, but a good assessment reaches for it after reducing the hazard at source, not instead of doing so.

The written record is what makes the assessment usable. It should state the product, the dilution, the task, the space, the controls, the PPE and the review trigger, in language a technician and an auditor can both follow. That record is also what lets procurement and asset-integrity teams see that the cleaning step was assessed properly rather than assumed.