• Twitter
  • Facebook
  • LinkedIn
  • Mail
  • Call Me Back
  • About
  • Knowledge
📞 Call us on 0330 223 31 31
  • 0Shopping Cart
Water Treatment Services
  • Home
  • Water
    • Applications
      • Boiler Water Treatment
      • Cooling Water Treatment
      • Closed Loop Water Treatment
      • Legionella Control
    • Services
      • Cooling Tower Cleaning
      • Cooling Tower Maintenance
      • Chlorine Dioxide Water Treatment
      • Commercial Water Softeners
      • Pre-Commission Cleaning
      • Tank Reline & Repair
      • TMV Servicing
      • Water Chlorination & Disinfection
      • Water Leak Detection
      • Water Testing
        • Drinking Water Testing
        • Metals Testing
        • Pool Water Testing
        • BSRIA Closed System Testing
        • SDI Testing & Analysis
        • Trade Effluent Testing
    • Training
      • Water Treatment Training
      • Basic Chemistry of Water
      • Industrial Treatment
      • Pre-Treatment
      • Boiler Treatment
      • Cooling Systems
      • Closed Systems
      • Wastewater Training
      • Advanced Treatments
      • Training Dates 2021
  • Wastewater
    • Metals Testing
    • Trade Effluent Testing
    • Wastewater Training
  • Air
    • Ductwork Cleaning
    • Indoor Air Quality
    • Local Exhaust Ventilation
    • Mould Testing
  • Energy
  • Legionella
    • Legionella Risk Assessment
    • Legionella Training Courses
      • Legionella Awareness Training
      • Responsible Person Training
      • Water Hygiene Awareness
      • Pseudomonas Training
      • Training Dates 2021
    • Legionella Testing
  • Contact
  • Search
  • Menu Menu
You are here: Home1 / Knowledge2 / Energy3 / Troubleshooting Problematic Closed Water Systems
Troubleshooting closed water systems

Troubleshooting Problematic Closed Water Systems

This technical troubleshooting guide looks at closed water systems, highlighting the most common problems that affect such closed heating and chilled water systems. The guide examines the problems of scale, corrosion, foaming and the build-up of bacteria and biofilm in closed loops. It also gives guidance on the selection and application of specialist water treatment chemicals designed to tackle specific issues.

Troubleshooting closed water systems

Many of the problems that affect closed heating and chilled water systems, such as scale and corrosion, can also affect open water systems.

However, one of the main differences in a closed water system is that the water is encapsulated in a closed loop arrangement and so can be chemically treated at much higher and consistent concentrations, given that there is none of the water (and associated chemical) loss typically associated with open systems.

There are a number of problems which crop-up frequently when considering both the on-going maintenance and water testing of closed loop systems… and each problem has a different chemical treatment solution which works best at dealing with it.

Dealing with scale formation in closed systems

Closed systems generally don’t suffer from serious scaling issues, unless the water used to charge the system initially is particularly hard.

Scaling can also occur if make-up water added to the system periodically to top-up water levels is particularly hard.

If however, you are experiencing high levels of calcium carbonate (scale) inside the water system, then you should consider using an on-line descaling product which can be dosed in to the water.

  • Learn more about closed system water testing

 This type of on-line de-scaler will gradually decrease the levels of scale as the system runs as normal.

Dealing with calcium carbonate deposits which have built up on the internal pipework surfaces can also help to prevent under deposit corrosion.

Descalers can also save you money on your energy bills by restoring heat transfer efficiencies – as scale can act as an unwanted insulator.

How to control high copper levels in closed water systems

If you have detected high levels of copper in your closed loop water system, then one of the best treatment methods is to add in an azole based film-forming inhibitor.

Such products work by forming a protective barrier on the surface of the copper which helps to protect it.

Ideally you should look for a copper corrosion inhibitor that contains enough azole to also protect small amounts of yellow metal within the closed system from becoming corroded.

If your pipework system is extensive with lots of copper present, then you might need to add a separate yellow metal corrosion inhibitor to make sure that you have adequate levels of protection against both copper and yellow metal corrosion.

Controlling foaming in closed-loop systems

Foaming can affect closed systems but is less common than problems such as corrosion and scaling… if it occurs however, it still needs to be dealt with effectively.

Foam found in a closed water system is usually due to poor system design, and a high rate of water flow through the pipework.

Adding a low dosage of a special antifoaming agent can help resolve these issues.

Nitrite reducing bacteria (NRB) and reduced nitrite levels

If you are already dosing your closed water system with a multi-metal corrosion inhibitor, and you have determined through water testing that you have appropriate levels of molybdate, but are still struggling with nitrite levels that are significantly less than 250 parts per million, then the most likely culprit is nitrite reducing bacteria, or NRB.

If your system has been colonised by this type of bacteria, then you need to consider adding an appropriate biocide into the water system to deal with it.

Once added allow the biocide to circulate around the system for around one week, and then test again to ensure that you have managed to get bacterial levels under control.

When you are confident that the nitrite reducing bacteria are under control you should then look to add a nitrite supplement to bring the levels in the water back up to greater than 250 parts per million.

Controlling biofilm in closed loop systems

Even when biocides are being added into your system, sometimes this isn’t enough to bring the levels of bacteria and microbes down to acceptable levels.

The most common reason for this stubborn build-up of bacteria is due to the formation of biofilm (or slime) in the system.

This slimy biofilm forms a protective barrier or shield that sticks to the inside surfaces of the system, protecting the bacteria and preventing the biocide from doing its job

Over time, the bacteria break free from the biofilm to re-contaminate the water in the system.

The build-up of biofilm can be treated by dosing a special chemicals called bio-dispersants, designed to disrupt the biofilm, lifting the film away from the surface of the pipework so it can then be removed.

An added benefit of using bio-dispersant chemicals in a closed water system is that removing the biofilm from the pipes will also prevent corrosion forming under the slimy deposits, and ensure that any corrosion inhibitors used are fully in contact with the surface metals to protect them.

Bio-dispersants are typically used in conjunction with a biocide to control the overall numbers of bacteria.

It’s important to remember that once it’s been dislodged, the biofilm has to go somewhere in the system.

Consider also the possibility of clumps of free-floating biofilm blocking smaller pipes entirely.

If your pipes are wider, then strainers added into the system will collect any larger clumps of slime that are dislodged.

Once the bio-dispersant chemicals have been added, any strainers fitted to the system will need to be removed and carefully cleaned regularly to ensure the closed system doesn’t block.

  • Learn more about filters for closed systems

Selecting water treatment for closed loop systems

You should always seek specialist advice when developing a water treatment programme for closed heating and chilled water systems to ensure any chemical additives used are the most appropriate for your needs, given the individual specification and design.

  • How to develop the best water treatment programme for closed systems

Closed water system experts

Water Treatment Services offer a comprehensive range of solutions for the management of closed heating, chilled and cooling water systems.

Find out how we can help improve the thermal performance of your closed systems, lower energy bills, reduce maintenance costs and down-time, and extend plant life-cycles.

Our industrial water treatment experts can provide advice and full support to help you identify the most appropriate strategies for managing your water systems.

With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, water treatment specialists and technicians we offer cost effective environmental support solutions across the whole of the UK and Ireland.

Contact us today to learn how our water management solutions can help improve the performance of your heating, chilled and cooling water systems.

Contact Us Today

Further reading…

Learn more about our expert solutions for closed heating and cooling systems.

 

Tags: Closed loop water systems, Closed Systems, water treatment
You might also like
Controlling bacteria in closed systems Controlling Bacteria in Closed Systems
Types of cooling tower All About Cooling Towers
Antibiotics and antimicrobial resistance Antibiotics & Antimicrobial Resistance – Goodbye to the Power of Antibiotics?
Using Chlorine Dioxide to Treat Water, Wastewater & Effluent Using Chlorine Dioxide to Treat Water, Wastewater & Industrial Effluents
Reverse Osmosis Water Purification Reverse Osmosis (RO) for Water Purification
Guide to Treating Industrial Effluent Guide to Treating Industrial Effluent (Trade Effluent)
10 causes of industrial equipment-failure 10 Causes of Industrial Plant and Equipment Failure
When to test for legionella When Should You Test For Legionella?

Search…

What’s New

  • Managing Asbestos in the Workplace – Practical Guidance

    Managing Asbestos in the Workplace – Practical Guidance

    This practical guide to managing asbestos in the workplace …
  • Guide to Dust Exposure in the Workplace

    Guide to Dust Exposure in the Workplace

    The indoor air quality and ventilation specialists at WTS …
  • Air-Conditioning and Covid-19 – Can HVAC Spread Coronavirus in Buildings?

    Air-Conditioning and Covid-19 – Can HVAC Spread Coronavirus in Buildings?

    This article looks how Covid-19 can be transmitted in …
  • Health Effects of Drinking Softened Water

    Health Effects of Drinking Softened Water

    This article looks at the potential health effects of …
  • How to Stop Pipes Freezing

    How to Stop Pipes Freezing

    Whether plumbing systems are used at home or at …
  • What is Trade Effluent?

    What is Trade Effluent?

    Trade effluent is defined as any liquid waste which …

REVIEWS

4.8
Rated 4.8 out of 5
Water Treatment Services is rated 4.8 out of 5 stars (based on 94 reviews)
Read our reviews

Free Newsletter

Receive exciting features, news, latest research and special offers! Just add your email address and we'll do the rest.

Contact us

Water Treatment Services

[email protected]

Tel: 0330 223 31 31

© Copyright 2021 - EDG Ltd. Operating as Water Treatment Services
  • Twitter
  • Facebook
  • LinkedIn
  • Mail
  • Home
  • About
  • Careers
  • Privacy
  • Environment
  • Reviews
  • Sitemap
District Heating – Heat Distribution Networks Explained District heating explained What is trade effluent? What is Trade Effluent?
Scroll to top

WTS response to Covid-19. As a responsible organisation we have robust Business Continuity Plans in place to ensure business as usual whatever the circumstance. In response to Covid-19, our aim is to ensure continued operations whilst protecting both our people and our clients. To this end we have initiated a number of practical measures that will allow us to continue to support our clients in the most appropriate way. Rest assured that we are making every effort to prevent or minimise any impact on our services during this public health challenge.

OK

Cookie and Privacy Settings



How we use cookies

We may request cookies to be set on your device. We use cookies to let us know when you visit our websites, how you interact with us, to enrich your user experience, and to customize your relationship with our website.

Click on the different category headings to find out more. You can also change some of your preferences. Note that blocking some types of cookies may impact your experience on our websites and the services we are able to offer.

Essential Website Cookies

These cookies are strictly necessary to provide you with services available through our website and to use some of its features.

Because these cookies are strictly necessary to deliver the website, refuseing them will have impact how our site functions. You always can block or delete cookies by changing your browser settings and force blocking all cookies on this website. But this will always prompt you to accept/refuse cookies when revisiting our site.

We fully respect if you want to refuse cookies but to avoid asking you again and again kindly allow us to store a cookie for that. You are free to opt out any time or opt in for other cookies to get a better experience. If you refuse cookies we will remove all set cookies in our domain.

We provide you with a list of stored cookies on your computer in our domain so you can check what we stored. Due to security reasons we are not able to show or modify cookies from other domains. You can check these in your browser security settings.

Google Analytics Cookies

These cookies collect information that is used either in aggregate form to help us understand how our website is being used or how effective our marketing campaigns are, or to help us customize our website and application for you in order to enhance your experience.

If you do not want that we track your visit to our site you can disable tracking in your browser here:

Other external services

We also use different external services like Google Webfonts, Google Maps, and external Video providers. Since these providers may collect personal data like your IP address we allow you to block them here. Please be aware that this might heavily reduce the functionality and appearance of our site. Changes will take effect once you reload the page.

Google Webfont Settings:

Google Map Settings:

Google reCaptcha Settings:

Vimeo and Youtube video embeds:

Other cookies

The following cookies are also needed - You can choose if you want to allow them:

Privacy Policy

You can read about our cookies and privacy settings in detail on our Privacy Policy Page.

Privacy
Accept settingsHide notification only