Locate and clear blockages

PVC pipes are suitable for high temperature discharges.

• True

• False

Galvanised steel pipes corrode internally.

• True

• False

Generally, the owner of the property is responsible for blockages upstream of the point of connection to the authority’s sewer.

• True

• False

If the shaft is not full of sewage/water, the blockage is downstream of the shaft.

• True

• False

You must never insert drain-cleaning rods or a sewer cable past the connection point to the authority’s main or into the sewer main.

• True

• False

Any drain you may be clearing connected to the network’s utility sewer must not be less than DN 100 at the point of connection.

• True

• False

Answer explanation

Min. size of main drain is DN 100

After the blockage is cleared IO caps should be replaced along with the sealing ring.

• True

• False

When investigating a blockage you must visually inspect gullies for evidence of overflow.

• True

• False

When investigating a blockage, fixtures should be flushed one by one to try to isolate the potential blockage point.

• True

• False

What are the three main causes for pipe blockages?

• Roots

• Foreign objects

• Pipe Breaks

• Air