Posted By Paul Craythorne Steve, As far as I am aware, the only official and specific HSE Guidance relating to HP Jetting is Guidance Note PM29 'Electrical Risks From Steam/Water Pressure Cleaners'. As its title suggests, it is only concerned with electrical safety. You have stated in your posting that there is a voluntary industry 'Code of Practice'. If this is the case, then the HSE may have had an input into it, or if not, would be aware of it and may refer to it for guidance in the event of an accident investigation. Having worked for the hot metal forging industry, I am aware that the HSE do not always have industry specific guidance. It is therefore left to the industry to develop its own guidance. The HSE often get involved in this as they are keen to see industry helping itself. My advice is to use your existing industry specific guidance and if necessary, review and amend it accordingly. Regards, Paul