Hollow Supports within CWST and the Risks
It has been found that the internal supports in cold water tanks can hold stagnant water that can allow biofilm and slime growth which can harbour micro-organisms such as Legionella and Pseudomonas. The use of uncapped PVC-U pipes (or similar) within cold water tanks as a support structure for the lid is likely to lead to stagnation and harbouring of harmful micro-organisms.
The UK Department of Health Alert (EFA/2013/004) issued on 19th November 2013, has highlighted an issue with cold water storage tanks which indicates that hollow tank supports are no longer permitted in cold water storage tank installations. This is also supported by the new ACoP L8 legislation provided by the Health and Safety Executive.
Hollow internal supports restrict the movement of water, allowing bacteria to form within a cold water storage tanks. Tanks that contain hollow supports have been identified by the HSE and EFA as providing an environment in which water can stagnate. The presence of stagnant water is likely to encourage the growth of Legionella bacteria above the recommended risk levels. This would then present the risk of the entire domestic water system becoming contaminated. The Hollow Supports should be removed to eliminate possible contamination and replaced with ‘clean’ solid supports, i.e. ones without cavities, crevices or details allowing water to stagnate and harbour micro-organisms.
How can we help?
Comfort Services Group can provide the hollow support replacement service and at the same time offer cleaning and disinfecting of the internal surfaces of the cold water storage tank, which will eliminate the risk of stagnation and contamination from Legionella bacteria.
What Our Customers Say
“The team at Comfort Services Group were awesome when they carried out the Legionella Control works at our offices, they were very accommodating, Tom and the guys on site were a pleasure to work with. I would recommend the services of Comfort Services Group without reservation. Excellent First impressions with the Office Team, which was mirrored by the guys who did the work. Thanks guys.”
Michael Green
“I have had Comfort commissioning working on different projects for the companies i have worked for over the past 15 years. They have assisted in many difficult projects throughout the country. Andy and Lawrence have been very professional and helpful. i found their attitude, and pro-active approach to be of very high standard. i will always push to use them on future projects”
Chris Richards
“Comfort commissioning are a great company, they deliver great services and the team there are very helpful and efficient. They really do care about their customers and take a keen interest in ensuring a high level of customer service is maintained at all times.”
Gary Clatworthy
“Fantastic service from Comfort from start to finish. Very responsive, friendly, reliable and professional.”
Sarah
“Contacted Comfort Commissioning Services Ltd for advice about unusual deposits in the header tank of an open vented domestic heating system. Not core business for them, but one of their directors responded to me really quickly via email with some excellent free advice which was greatly appreciated. Very impressed.”
Pete Davies
Contact Comfort Services Group for help with investigation and any remedial actions that may need to be taken.
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