PPr Welding Guidelines

For Pipe Work Inside Buildings

• Do not secure one pipe to another or use a pipe to support others.

• Arrange pipes for easy identification and use mounting plates as needed.

• Lay pipes to prevent air locks and provide drainage fittings at the lowest points to avoid frost damage.

• Place exposed cold water pipes at the lowest level to minimize condensation risk.

• Install a riser in each building if the system supplies water to multiple buildings.

• Ensure the main branch pipe branches off at least 300 mm above the maximum water level on each floor if draw-off points require backflow prevention but are not individually isolated (DIN 1988 part 4).

Instructions for Welding Bluetherm Pipes & Fittings

Heat the welding machine to 260°C as described in “Using Bluetherm Welding Device & Tools.”

1. Cutting the Pipe:

   Use the Bluetherm pipe cutter to cut the pipe, ensuring a straight and clean cut, not at an angle. This ensures proper welding conditions.

   The Bluetherm fusion welding process consists of three stages:

   Stage I: Initial heating and fitting expansion.

   Stage II: Heat soaking to create the joint.

   Stage III: Joint cooling.

   Note: Stages I and II are collectively termed ‘fusion time.’ Successful pipe joining requires the following preparation stages:

   First: Ensure pipe ends are squared, not chamfered or broken. This ensures full contact with the welding tools for proper heat conduction. For Stabi composite pipes, completely peel off the aluminum polypropylene layer before welding.

   Second: Clean the pipe surfaces to remove contaminants and foreign material. Contaminants at the joint interface can significantly weaken the joint.

   Finally: Clamp the pipe and fitting during welding to prevent movement. This ensures the molten polymer fuses fully at the interface, creating a strong joint.

2. Mark the Welding Depth:

   Use a pencil and the measurement plate to mark the welding depth. Details given in table below.

3. Heating and Joining:

   • Insert the pipe end into the tool up to the marked depth without twisting. Simultaneously, push the fitting onto the heating tool without twisting, following the heating times outlined in table.

   • Timing for heating starts once the pipe and fitting reach the marked welding depth. Heat both for the set time, then remove from the heating tool and press together to the marked depth for a few seconds without twisting. This forms a homogeneous structure.

   • Perform major alignment before inserting the pipe and fitting. Use fusion time for minor alignment before cooling. Do not stress the joint mechanically before cooling time completes.

   A properly welded Bluetherm joint will show a smooth transition between the two parts, indicating uniform melting and fusion into a single piece. For the Bluetherm Electro Fusion coupling welding procedure, please refer to the Technical Manual Installation.