Method Statement For Chlorination Domestic Water Supply Piping System

Method Statement for Chlorination Domestic Water Supply Piping System

This Method Statement for Chlorination Domestic Water Supply Piping System aims to control the commissioning operations in accordance with the Project Quality Plan and Project Commissioning Specification requirements to obtain the best outcomes.

This method statement serves as guidelines for completing the chlorination of the water supply system in line with the commissioning plan, contract specifications, and approved project quality plan.

The chemical supplier will do all pre-commissioning and commissioning tasks for the water supply system (chlorination) directly under the direction of the commissioning team. Before submitting the Commissioning works for the consultant or client approval and inspection, the team will check them.

The commissioning team will make necessary corrections and resubmit the test for approval in the event that any test fails.

The commissioning team shall save all Original Test reports that were seen and approved. A copy of the Water Supply System (Chlorination) final testing & commissioning report will be sent to the client for approval.

The commissioning team is responsible for gathering, preparing, and maintaining all commissioning results in accordance with this method.

Instruments & Tools

Mechanical tool kit for plumbing
Kit for Testing Chlorine

Every instrument used for testing must have a current calibration, and a certificate must be provided.

Health and Safety Requirements

Only skilled testing and commissioning teams with specialist subcontractor employees can mix the chlorine chemicals into the water supply system.

Dust and building debris must not be present in the vicinity.

To prevent leakage, competent operators from the T&C team and the specialist subcontractor must inspect the mixing unit and the connections.

Prior to starting the chlorination work, the safety department must be provided with supporting documentation for the competence of the specialized contractor employees, as well as third-party inspection certificates for the equipment.

Offer a task light and a pedestal fan for adequate lighting and ventilation in the work area.

Hold a specific training session and inform all employees of the dangers, safety measures, and emergency procedures (including the safety measures outlined in the MSDS and COSHH Assessments).

To provide the necessary personal protective equipment and ensure its proper use when mixing, consult the CoSHH Assessments for the Chlorinated Chemicals.

Remove all employees not required for the operation from the chlorine mixing area.

Prior to starting work and at the end of the shift, confirm the physical fitness of every worker.

Before testing, remove all combustible items and unnecessary tools from the plant room.

Display warning signs in all water outlets (Danger Chlorination Going On, No Unauthorized Entry, Do Not Use and Drink This Water, etc.) and provide sufficient information to people working close.

Maintain orderliness throughout the workday.

An accountable site engineer must always be present to ensure that the work is done as safely as possible.

The testing commissioning team must adhere strictly to the approved Lockout/Tag out Procedures when turning on the water pump for chlorination.

Use the Lockout Tag out procedures to isolate all electrical equipment that is not required.

RCDs, ELCBs, and GFCIs can isolate equipment to ensure a sufficient power supply.

To control illegal uses and keep an eye on leaks, designate one capable worker to serve as a watchman (24 hours).

Wear rubber hand gloves, respirators, and transparent safety glasses to exercise greater caution.

Place appropriate numbers of emergency contact information, such as the Chemical Safety Team, in distant areas.

Any spill in the working area must be reported and cleaned up as away.

In the event of a significant spill, isolate the power supply, stop the spread, and immediately contact the HSE or chemical safety team.

Waste water must drain to a temporary tank after testing and be disposed of by a certified third party.

Methodology for Chlorination Domestic Water Supply Piping System

The Method Statement for Chlorination Domestic Water Supply Piping System outlines the procedures for disinfecting water supply piping systems in domestic buildings. The process involves the following steps:

Step 1: Preparation

Before starting the chlorination process, preparing the water supply system is essential. The following steps should be taken:

1. Close all valves and taps connected to the water supply system.
2. Drain all water from the system.
3. Remove any debris or sediment from the pipes.

Step 2: Mixing the Chlorine Solution

The next step is to mix the chlorine solution. The following steps should be taken:

1. Calculate the amount of chlorine needed based on the volume of water in the system.
2. Mix the chlorine with water in a separate container.
3. Stir the solution until the chlorine is completely dissolved.

Step 3: Adding the Chlorine Solution

The next step is to add the chlorine solution to the water supply system. The following steps should be taken:

1. Open the valve to allow the chlorine solution to enter the water supply system.
2. Let the chlorine solution circulate through the system for a minimum of two hours.

Step 4: Flushing the System

The final step is to flush the system. The following steps should be taken:

1. Drain all water from the system.
2. Flush the system with clean water until there is no chlorine in the water.
3. Open all valves and taps connected to the water supply system to allow the water to flow freely.

Pre Commissioning Phase

Before the water supply system is chlorinated, the pre-commissioning checks’ primary goal is to prepare and examine the installation of piping and a residential water tank.

The test sheets will be checked off the following list.

Verify the booster pump’s installation and operation.

Before applying chlorine, ensure all filtration, softening, water heating, and calorifier systems have been turned off.

Ensure the isolation valve is installed for both the intake and the outlet.

The strainer should be installed, so check.

Make sure the piping system testing is finished.

Ensure the tank installation is approved and the necessary test successfully accomplished.

Commissioning Phase

Procedure for Commissioning Chlorination

Remove the treatment system from usage by the general population.
Post appropriate hazard warning signs at all important entrances, such as the bathroom, tank room, and similar locations.

Before flushing, fill the tank with new water and turn on the booster pump to spread it throughout the system.

As much as possible, drain the water tank and the distribution system to physically clean and empty it of all deposits of rust, slime, silt, scale, and other fouling.

Refill the water tanks with fresh water, then cut off the cosmetics supply.
Add the approved chemical or tablets to the water in the tank to add chlorine, bringing the water’s measured free chlorine level to at least 50 ppm. Using the provided testing chlorine kit, this can be determined.

If the color is yellow, the concentration is 50 ppm or higher; otherwise, a second chemical tablet is needed.

Charge the system with the chlorinated water from the water tanks after an hour. It is important to bypass all filtration, softener, water heater, and calorifier systems.
Each draw-off fitting should be opened one at a time, moving farther away from the water tank and pipeline once the water tank and pipeline have been chlorinated.

When the water discharges smell like chlorine, all taps and draw-off fittings should be shut off. The water tanks and pipelines must be filled and chlorinated as described above; they must not be allowed to become empty during this operation. For a full day, the water tanks and pipelines should be charged.

Open several outlets, especially those highest or farthest from the water tank, and check the free chlorine level after 24 hours. The disinfection process must be repeated if the free residual chlorine content is less than 30 ppm (using a testing kit, a pink hue should be produced). In any other case, drain 20% of the tank’s water.

After draining, add 1.55 ppm of chlorine-neutralizing solution per 1 ppm of free chlorine.

Fill the fresh water tank with the equivalent of the 20% that was previously drained after adding the neutralizing solution.

Hold off on charging the system for 3–4 hours. All outlets and taps must be open during system charging to release water until the water flowing from the faucets is clear and does not smell of chlorine.

The sample must be taken from the designated place for the microbiological test.
An approved laboratory will test the sample.

Final Certification will be provided upon successful completion of the procedure mentioned above.

Conclusion

The Method Statement for Chlorination Domestic Water Supply Piping System is a vital document that outlines the procedures for disinfecting water supply piping systems in domestic buildings. Chlorination is essential to ensure that the water is safe for consumption, and the method statement provides a clear set of instructions for the chlorination process.

It is important to note that a professional should do chlorination with the necessary equipment and expertise to carry out the process correctly. Additionally, it is crucial to flush the system with clean water after chlorination to ensure that the water is safe for consumption.

If you are in doubt about the safety of your water supply system, it is essential to carry out chlorination and ensure that the water is safe for consumption.

tag: Method Statement For Chlorination Domestic Water Supply Piping System