Titan Mechanical is a leading provider in the water treatment industry offering a comprehensive range of services. In this expert guide, we take a look at the use of expansion vessels in pressurised hot water systems, the risk of Legionella and how to manage those risks within your water supply.
After a risk assessment of your water system has taken place, it's likely that some remedial actions may be necessary to bring your water system up to compliance.
Our wide range of remedial water services includes expansion vessel replacement, installation of drain valves, the fitting of isolation valves, and various maintenance works. At Titan Mechanical, all our remedial work is carried out by highly trained experts who meet the risk assessment requirements and industry standards.
One of the biggest risks to water systems is the build-up of bacteria inside. Left to grow, bacteria could increase and when dangerous levels are reached could be a risk to humans. Expansion vessels have been shown to increase the risks associated with bacteria growth because when a pressurised system is running efficiently, there could be long periods without flowing water.
The UK's Health and Safety Executive have therefore released a number of recommendations to minimise this risk.
If you have an existing water system, Health and Safety regulations state that a full Legionella risk assessment should be carried out to identify any issues and that this should be continually renewed throughout the lifecycle.
It's also important that you check:
Expansion vessels can be found in the majority of modern pressurised hot water and heating systems. Their main aim is to protect the water system from a build-up of pressure which could damage installation. Usually, expansion vessels are filled with air. If pressure builds up in the water system, the air is compressed to absorb any excess pressure, protecting the pipework and any other components. If installed properly, the vessel will fill and empty between pump runs and exchange water at regular intervals.
Expansion vessels are very common in water heating systems and can be found in schools, offices, factories, hotels, nursing homes, and many other places. The Health and Safety Executive has stated that these vessels could potentially carry a risk of Legionella as a result of low water flow or stagnation problems. While many people believe the risk of Legionella is reduced if a water system is rarely used, little-used outlets and water systems can often present the highest risk.
In the UK, if you are an employer, or you control premises that have an expansion vessel in its water heating system, you'll need to carry out a risk assessment of the water systems that are under your control.
The first step is to find out whether your hot water system contains an expansion vessel. It's worth noting that if you have a combination boiler, the expansion vessel is usually hidden under the cover of the boiler. In other hot water systems, the expansion vessel can often be found in a stand-alone unit away from the calorifier or water heater. They're usually a cylinder shape and coloured red.
There are a huge range of expansion vessels including flow-through types, bladder, diaphragm, and a potable water expansion vessel.
Diaphragm and bladder vessels often include a fixed and interchangeable bladder which can be made from synthetic rubber such as EPDM. These materials can harbour the growth of microorganisms including legionella.
Expansion vessels can also be found in potable water systems. This area needs particular attention as potable water systems are designed to hold water which is suitable for consumption. Potable water expansion vessels must, therefore, comply with the highest standards of hygiene and manufacture.
Strictly compliant - Titan Mechanical ensure that all Legionella remedial works are based on the requirements of BS 8558:2015 & BS EN 806 parts 1-5 and comply with The Water Supply Regulations 1999 to ensure your water system adheres to all health and safety guidance and best practice.
Experience - Our team of experts have over 50 years of combined experience, bringing a thorough knowledge of the industry and unrivalled expertise in dealing with a variety of water systems.
Additional services - In addition to the planned remedial work and water system maintenance, we also carry out tank refurbishment and tank reline services that are cost effective and completed to a very high standard.
Accredited - We are proud to have been accredited by CHAS and to be members of the Legionella Control Association (LCA).
Nationwide coverage - With a Head Office based near Liverpool, we have teams working up and down the country and have the capacity to carry out Legionella remedial works in the South and South East England, North West, Midlands, South East England, and Wales, North, North East, and Scotland.
Our team of experts have over 50 years of combined experience, bringing a thorough knowledge of the industry and unrivalled expertise in dealing with a variety of water systems.
We are proud to have been accredited to the highest standard for all our services. Please [visit our homepage - link] to see a full list of accreditations.
In addition to the planned remedial work and water system maintenance, we also carry out [tank refurbishment and tank reline (please link to tank reline page on all pages] services that are cost effective and completed to a very high standard.
With a Head Office based near Liverpool, we have teams working up and down the country and have the capacity to carry out Legionella remedial works in the South and South East England, North West, Midlands, South East England, and Wales, North, North East, and Scotland.
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Titan Mechanical Services deliver all works in line with current best practice and applicable British standards.
Call 01704 335800 to speak to our expert team.