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Chlorinating Pipework: A Guide to Disinfection

Chlorinating pipework is a specialised and essential procedure where water pipes and associated systems are professionally cleaned and disinfected using a chlorine-based solution. This process is critical for eradicating harmful bacteria, viruses, and other microorganisms to ensure water is safe for consumption and use. Pipe Testing Services (PTS) regularly carries out pipework chlorination nationwide,

    Chlorinating Pipework:
    A Comprehensive Guide to Disinfection

    Chlorinating pipework is a specialised and essential procedure where water pipes and associated systems are professionally cleaned and disinfected using a chlorine-based solution. This process is critical for eradicating harmful bacteria, viruses, and other microorganisms to ensure water is safe for consumption and use. Pipe Testing Services (PTS) regularly carries out pipework chlorination nationwide, safeguarding public health for both new installations and existing systems requiring maintenance. This guide explains the process, its importance, and how PTS delivers this vital service.

    chlorinating pipework & water mains chlorination - image of PTS working on pipework.

    Why is Pipework Chlorination Important?

    Properly chlorinating pipework is a fundamental safety measure that protects public health. The key benefits of engaging professional services from PTS include:

    When is Chlorinating Pipework Required?

    Pipework chlorination is necessary in several key scenarios to mitigate contamination risks:

    The Pipework Chlorination Process – A Step-by-Step Guide

    Here’s the simplified yet thorough process PTS follows to chlorinate pipework for our clients across the UK:

    Step 1: Initial Assessment

    Our technicians evaluate the system’s condition, size, and configuration to determine the most appropriate chlorination method and safety requirements, following our Chlorination Safety Protocols.

    Step 2: System Preparation & Isolation

    The section of pipework to be chlorinated is isolated from the rest of the system to prevent cross-contamination. All fittings are checked to ensure they are secure.

    Step 3: Pre-Chlorination Flushing

    The isolated section is thoroughly flushed with clean water to remove any loose debris, sediment, or installation residues. This step is critical as debris can reduce the effectiveness of the chlorine.

    Step 4: Chlorine Solution Preparation & Application

    A chlorine solution is mixed to the required concentration (typically 50mg/l or higher, as per BS 8558). This solution is then carefully introduced, filling the entire pipework section.

    Internal Pipework Chlorination UK Cost - image of water droplets
    Internal Pipework Chlorination UK Cost - water Pipe work
    Internal Pipework Chlorination UK Cost - water Pipe work
    Internal Pipework Chlorination UK Cost - water Pipe work

    Step 5: Contact Time

    The chlorine solution is allowed to remain in the system for a specified period, usually at least one hour. This “contact time” is crucial for the disinfectant to effectively kill all microorganisms.

    Step 6: Flushing and Neutralization (Dechlorination)

    After the contact time, the chlorinated water is flushed from the system. It is then neutralized using an approved dechlorination method before being safely discharged, a process detailed on our Dechlorination of Pipelines page.

    Step 7: Testing and Certification

    Post-flushing, water quality samples are taken for microbiological and chemical analysis by a UKAS accredited laboratory. This testing confirms the disinfection was successful. Upon passing, we issue the necessary Chlorination Certificates Explained in more detail on our dedicated page.

    Chlorinating New vs. Old Pipework: Key Differences

    The approach to chlorinating pipework varies depending on its age and condition:

    Pipe Swabbing. Disinfection by-products (DBPs). Chlorination Services carried out by PTS; swabbing, de-chlorination, chlorination. Water Sampling After Chlorination

    New Pipework Chlorination

    When chlorinating new pipework, the focus is on removing manufacturing residues and any contaminants introduced during installation.

    Old or Existing Pipework Chlorination

    Chlorinating older, existing pipework presents unique challenges that require a more rigorous approach:

    What Does Pipework Chlorination Test For?

    The post-disinfection water samples are tested to confirm the absence of harmful bacteria and the suitability of the water. Key tests include:

    • Presence of E. coli and other coliform bacteria.
    • Total Viable Count (TVC) of microorganisms.
    • Chlorine residuals.
    • Water turbidity and clarity.
    • pH levels.
    water mains replacement contract - pressure testing, chlorination. Water systems fusion welding. Pneumatic Leak Testing.
    Image used as an example for legionella detection, water microbiological sampling, and, legionella testing services. Legionella control in healthcare facilities

    Choose PTS for Professional Pipework Chlorination

    Engaging a professional service like PTS offers significant advantages in expertise, safety, and compliance. We ensure adherence to all local regulations, use the correct equipment and techniques for effective disinfection, and provide comprehensive documentation. Our tried-and-true methods minimise the risk of recontamination and ensure your peace of mind.

    Get in Touch for Expert Pipework Chlorination Services

    For professional chlorination services that ensure the safety and compliance of your water systems, contact our expert team today. We provide comprehensive solutions tailored to your specific needs, backed by years of experience and adherence to the highest industry standards.

    Pipework Chlorination
    Services FAQs

    The most commonly used chemical for disinfecting water systems is a solution of sodium hypochlorite. It is a highly effective disinfectant that is carefully dosed to achieve the required chlorine concentration for killing microorganisms.

    While it may seem straightforward, pipework chlorination is a technical process that requires specialised knowledge of chemical handling, safety protocols, correct dosages, contact times, and testing procedures. To ensure safety, compliance with UK regulations, and effective disinfection, this task should always be entrusted to trained professionals like Pipe Testing Services.

    Failing to chlorinate pipework after a new installation or repair can lead to significant risks, including the proliferation of harmful bacteria like E. coli and Legionella, which can cause serious illness. It can also result in non-compliance with water regulations, failed inspections, and costly project delays.