What is a dead leg?
What is a dead leg? And How Do You Know If You Have One
In terms of your company’s water system, a dead leg is a section of piping that is no longer used, or rarely used. It is generally created when modifications have been made to the system and piping removed, leaving a small ‘leg’ that is capped.
Without having water flushing through it on a frequent basis, a dead leg will collect stagnant water, so the extra pipework needs to be made as short as possible and capped. A further danger of a dead leg is that, without movement, water is more likely to settle at a temperature that favours the legionella bacteria, creating the kind of conditions that will enable it to thrive.
How do you know you have a dead leg in your system?
As part of your legionella control programme, schematic drawings will map out where any dead legs occur. Getting a legionella risk assessment will identify whether these legs are a risk and recommend any remedial action you can take. If for any reason, it is not possible to remove the dead leg, you will need to do regular risk assessments to ensure water safety. In rare circumstances, a water pipe is used only occasionally and therefore cannot be removed, in which case you need to regularly flush water through it in order to help prevent the legionella bacteria from being able to take hold.
How to get rid of a dead leg
If you are unsure of how to get rid of a dead leg, hire a professional plumber to do the task for you. The length of redundant piping must be as short as possible. In fact, the Water Regulations Advisory Scheme (WRAS) recommends that a dead leg must be no longer than twice the width of your pipe, for example, a 30mm dead leg for a 15mm pipe. If your water system has a dead leg that is more than 100mm, you must cut off the excess in order to prevent the water from stagnating and to ensure the water remains safe.
If you are unsure about dead legs in your water system, contact us to arrange a legionella risk assessment or talk to us about our other services.
Legionella and Water Hygiene Blog Posts
With hairdressing businesses relying so heavily on water, hairdressers can understandably be worried about the legionella bacterium. Legionella is waterborne, and if inhaled on droplets or aerosols, it has the potential to cause the potentially fatal...
An outbreak of Legionnaires’ disease in your hotel would have disastrous consequences for your business. An outbreak could close your hotel with immediate effect until remedial work has taken place, resulting in adverse publicity as well as the stress...
January is traditionally a time of year when gyms are at their most crowded. The combination of Christmas over-indulgence and New Year’s Resolutions is enough to get half the population squeezing into their shorts to try to get back into shape. So with...
Water Hygiene Services
Why do so many choose uRisk?
25 Years Experience
Over 25 years of water hygiene and legionella control experience.
Customer Service Excellence
Friendly and simple advice by phone, email & online at your convenience.
City & Guilds Qualified
All staff are trained water hygiene consultants and engineers.
With engineers located all across the UK, we’re never too far away.
UKAS Accredited Testing
Our labs are UKAS approved providing you with quality assurance.
Full Compliance Services
Your one stop shop for legionella control, no need to go elsewhere.