![]() ![]() When installed correctly, an expansion vessel will partially fill and empty between pump runs and would normally exchange water at regular intervals. In most heating systems, expansion vessels are filled with air and if pressure builds up in the system, that air becomes compressed to absorb any excess pressure which helps to protect the pipework, vessels and other components from damage. ![]() They are designed to protect the components of the system from a build-up of pressure, usually caused by booster pumps, which could damage the installation. ![]() In this expert guide the specialists at Water Treatment Services examine the use of expansion vessels in pressurised heating systems, the potential legionella risks arising from their use and what can be done to manage those risks in line with current health and safety guidance from the Health and Safety Executive including ACOP L8 and HSG274 Part 2.Įxpansion vessels, sometimes called hydraulic accumulators are an essential component in most modern pressurised hot water and space heating systems. ![]()
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