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CRACKS & FRACTURES:
Cracks are one of the most common conditions recorded on C.C.T.V. surveys, they fall into 3 categories. Circumferential cracks, these, of course circle a part or all of the diameter of the pipe. Longitudinal cracks, these run down the pipe. They can be seen for a part of or all a given pipe. Multiple cracks, are a mixture of both of the above conditions. Cracks become continuous when they affect more than one length of pipe, with a crack in the same position. Fractures are visibly open cracks. |
DEFECTIVE CONNECTIONS:
Defective connections come in many forms; the one shown to the right intrudes into the main drain, causing the potential for blockage at a later date. |
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DEBRIS IN DRAIN:
Debris or detritus matter is deposited in drains as it falls out of suspension in the transport water. For the purpose of a basic C.C.T.V. survey, it is only necessary to worry about two types. The first type of debris to identify is grease. It is always a matter of some surprise when surveying domestic drains to find grease in varying amounts tracked to the side of the drain. In commercial situations the build up of grease can make an obvious case for the installation of a grease trap. |
ENCRUSTATION:
Encrustation of drainage pipework is caused by the build up of salts from the local water supply that is flushed down the drainage system. This condition is often more evident in hard water areas where lime salts are the main cause of the encrustation. This condition can build up throughout a drainage run. Cleaning this type of condition may require specialist equipment. |
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ROOT INGRESS:
Any root ingress usually falls into three categories; these are fine roots, tap roots or a root mass. The photograph shows a root mass. Tap roots are about as thick as your finger. It is worth remembering that root ingress often starts at a single point and then tail down the drain with the flow. |
COLLAPSE:
This drain condition is self explanatory. It cannot be confused with any other condition found whilst surveying. This condition is best isolated by surveying from any downstream chamber; this allows a physical distance to be recorded for the excavational repair. A pipe is deemed to be collapsed when more than 50% of its diameter is obstructed by broken pipe. |
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