Practically every water system has a pressure vessel somewhere and most have more than one. Here at Pumps UK we can specify, supply, install and inspect all vessel types with years of experience, specialised equipment and training.
A pressure vessel is a closed container made to hold liquids at a pressure different from the normal ambient pressure, commonly in pressure boosting and boiler systems.
Vessels have a membrane or a diaphragm that is pressurised by an air (or nitrogen) charge and the water expands against this.
Normally the vessels air charge is equal to the fill pressure of the system before the boiler is turned on. The vessel will start to take expansion when the water starts to heat up. If the vessel size or air charge is incorrect the system will over-expand and lift the safety valve in the system. On booster pump systems the vessel charge should be .2 Bar below the cut-in (starting) pressure of the pump. If the pressure is not correct the pump(s) will hunt and cause a fluctuation in the system.
This why an incorreclty sized or a badly maintained pressure vessel will at best cause issues with your water system and at worst cause a complete system failure.
This is where we come in, we are happy to advise you along the way so please message using the form below for advice.