The accumulator vessel is a device that fitted into a pressurised water system will provide system water at a pre-set sustained pressure. Its most common application is to supply systems in which the main supply pressure is too low and a pump is fitted to boost the pressure to an acceptable level. As system demands take place the accumulator vessel will sustain system pressure by feeding additional water into the system at the required pressure. This process will limit the number of times the pump needs to start (pump hunting) in order that system pressure remains at the optimal level. The 2000 litre accumulator pressure vessel. Mild steel. DN80 male bsp main connection. Replaceable EPDM membrane suitable for potable water. Maximum pressure 10 bar. Maximum and minimum liquid temperatures -10°c to +50°c