Naylor

MetroDrain Instructions

The Naylor MetroDrain Premium Drainage System is easily cut to length using a coarse toothed saw or jigsaw. Cuts should be made between the corrugations on the pipe. Before jointing, the pipe ends should be cleared of all sharp edges and dirt.

Naylor lubricant should be applied to the sealing ring and pipe end. The sealing ring is then located between the first and second corrugation on the pipe.

Ensure the inside of the connector or fitting is clean and then apply Naylor lubricant. The connector or fitting should then be pushed over the seal and on to the pipe ensuring all surfaces are kept clean during this process. It is often easier to start this process with the pipe at a slight angle.

The pipe should be pushed fully onto the connector or fitting until it reaches the stays within the connector or fitting. This can be done by hand or using timber as shown on the larger diameters.

Ensure that the alignment of the pipes is correct and that there is no excessive angular deflection.

If this procedure is not followed and Naylor Lubricant is not used, the airtight system guarantee is invalid.

Pressure Testing (Air test) – Test inline with current Highway Specifications, ensuring that the correct test equipment is used (4″ ‘U’ Guage).

  1. Seal the ends of the pipe and connectors or fittings with expanding stoppers.
  2. Fill a U-tube manometer with water to the required level without any trapped air bubbles.
  3. Connect the manometer to the port of one of the sealed stoppers.
  4. Increase the pressure until 100mm of water (0.01 Bar) is achieved.
  5. Let the pressure stabilise for 5 minutes and then increase the pressure to 100mm head of water if it drops.
  6. Record the pressure after 5 minutes. Larger diameters may require a longer test period, please refer to BS EN 1610 for details. It should not drop below 75mm head of water without any additional pumping.