Posted By Robert Jackson Amjad When discharged the Liquid / Gas drops in temperature ( below 80c) causing the ice. hope this helps Rj

Posted By Robert Jackson The cylinders are full of pressurised CO2 gas - same as what is used to make pop fizzy etc Not sure what you are thinking of using them for or how much training you have with them but easy advice is Dont touch the black nozzle when using and dont use in confined areas - 2 lung fulls of that and your brown bread mukka! Hope this helps Rj

Posted By Andrew1 Amjad, The following information is from BOC Gases website (www.bocindustrial.co.uk). In general when you release C02 the cylinder draws heat from the outside in order to provide sufficient pressure to force the gas out in gas form. This drawing of heat around the cylinder rapidly decreases the temperature in the vicinity which causes the icing effect sometimes visible. In gaseous withdrawal cylinders the carbon dioxide is stored in the cylinder as a liquid with a gaseous phase on top. As the gas is drawn off the liquid boils and releases more gas. To meet the demand for more gas, heat must be absorbed through the walls of the cylinder at a rate greater than the latent heat of vaporisation (the amount of energy required to turn a liquid to a gas). However, there comes a point were not enough energy can be passed through to cylinder to create the gas and when this happens crystals of dry ice may be drawn into the valve and gas control equipment. Hope this helps Andrew

Posted By Robert Jackson Amjad just a quickie on your last post mate, under the EU ruling all fire appliances must now be red so if you are using black ones (co2) still then i would ask your provider to change these ASAP Regards Rj

Posted By AMJAD AL ATA Rj, I've forgot to ask you sending me a link or other detailed information about the new EU colour code for extinguishers (I've googled it but found no usefull thing). Thanks in advance. Regards Amjad

Posted By AMJAD AL ATA Rj, All thanks. Amjad

Posted By Allen Higginson Unless (as is the case here) it is a fixed extinguishing system (usually activated but not always by automatic detection in a transformer room,boiler house etc.) where the cylinders usually are 90KG gross weight,in banks and are red!

Posted By TBC Yes - you can use old style until are past there sell by date i.e. no longer serviceable. It is good practise to keep old ones together though e.g. if you have two warehouses or two floors in a building try and keep the old extinguishers together and the new together. It will help to avoid confusion if ever they need to be used - and ensure the ID above the extinguisher also has the correct info. On the fixed systems - whether old or new the info signs will be highly visible.

Posted By AMJAD AL ATA Thanks to you all for responses; In the first psot, I was meaning fixed CO2 system, whcih as you said (red cylinders) together with information sign (CO2 Protected area ..etc) fixe in the entrance to the protected area. But regarding protable extinguishers we still useing the old one (totally black)(servicabl). In future if my employer going to purchase new one I am sure they will follow the new color code so the idea to separate them upon distribution, is good idea. Once again many thanks Amjad