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Posted By Mor Raphael
I have 14 portable canisters for pressure washing equipment. They are 200 litre capacity and run at 4 bar pressure plugged into the ring mains. Can anyone tell me if they come under pressure vessel requirements other than routine maintenance inspection. The HSE were on site last week and they themselves asked the question, they're unable to answer but perhaps someone can advise us please.
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Posted By Jim Walker
Google Pressure vessels directive -I'm fairly sure there is a definition, there.
You multiply the volume by pressure.
I'm a bit rusty in this field, but my knee jerk is yes they are.
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Posted By Catman
Hi
A relevant fluid under the regs is one which is 0.5 bar above atmospheric presssure and which would become a gas under release to the atmosphere, in this case meaning steam.
If its cold water it wont be covered by the regs.
So the answer to your question will depend on the water temperature.
The threshold in size is 250 bar litres.
Hope this helps.
Cheers
TW
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Posted By Jane Blunt
Have a look at L122, Safety of pressure systems, the Approved code of practice for the Pressure Systems Safety Regulations 2000. In particular the flow chart in the appendix gives you a decision tree to see which regulations apply under what circumstances.
There is a sliding scale for the requirements, and who does what is also determined by who owns the equipment.
The first question to be answered is what is the fluid inside? If it is air or another gas at a pressure greater than 0.5 bar above atmospheric, then you simply multiply the maximum working pressure in bar by the volume in litres, and if the answer is greater than 250 bar-litres all of the regulations apply. One of the outcomes is that you need to get a competent person to draw up a written scheme of examination and examine it in accordance with that scheme - many of us get insurance companies to do this.
The data you give indicate a product greater than 250 bar-litres.
If the working fluid is steam, then it requires a written scheme regardless of pressure-volume product.
As your previous correspondents have stated, if the fluid is a liquid such as water, and cannot yield gas or steam, then it simply comes under PUWER.
Jane
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