Plumbing Tips – Inspection

Being able to access all parts of the underground canals is clearly important. This is usually done by providing inspection chambers at different locations. To meet building regulations, chambers should be provided: at the junction between drains; Where the duct changes direction or inclination; At or near the beginning of the drain; And not at intervals of more than 45m on long, straight runs. Between the inspection chambers, the drains should be laid in straight lines.

The sides of the normal shape of the inspection chamber are made of bricks, often with cement inside or outside. There are open passages at the base of the holes with which the drains are connected and with which water flows in the drains.

The inspection chamber is at a confluence between three canals. The branch is connected to the drain main with a specially shaped half-channel bend that flows in the direction of water flow from the main channel.

Channels are built with benches – in the form of easily prepared concrete to send any splash back to the channels. The upper part of the inspection chamber is covered by a manhole with a heavy, cast iron plate set in the iron frame. If there is a manhole cover inside a building, it usually has to be lowered to the frame and the joint has to be sealed with grease.

With modern drain materials, it may not be necessary to have full inspection chambers at all junctions and turns in the drain. Instead, routing points can be used. Small circular inspection chambers can also be installed.

A rodding point is the length of a pipe in which a soft bend is connected at an angle to the groove. The other end of the pipe goes to the ground level and is covered by a removable cover. If the drain needs to be blocked, the lid is removed and the drain bars go down the drain. Roading points are small and clean – as opposed to large, ugly manhole covers – but some inspection chambers may be needed.

In older properties, an interceptor trap may be installed at the channel outlet in the inspection chamber on the property boundary. To access the length of the drain between the trap and the main gutter, the trap has its own rod arm that ignores the U-turn. The rod arm is fitted with a stopper (sometimes secured with a chain) to prevent the drain water from ignoring the U-turn.

This inspection chamber can also be ventilated from the side of the chamber through a short pipe above the ground. The pipe is usually attached to a grilled ventilator, with a flap at the back. The theory is that the flap allows fresh air to enter the drain but prevents dirty air from escaping. Ventilators are probably more of a hindrance than help, and damaged ones can be completely removed instead of repaired. Interceptor traps also cause problems as the rod arm restraint may fall off and obstruct the trap if it is not suspended by the chain.

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