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How to unblock a manhole

Before entering into the blocked manhole Muswell Hill, it is good to know the level of oxygen and to use a detector in measuring the flammability for all levels of a confined space from the top, middle or bottom. The flammability has to be measured using the Lower Flammable Limit and the Lower Explosive Limit. It is a small concentration for combustible gas. Because the toxic concentration can be heavier or lighter compared to the air, it can be found near the top and the bottom of a confined space. The atmosphere to test the toxic concentration of the vapor can be measured using the Threshold Limit Value. A confined space should be tested on three different levels for every atmospheric condition. Every level has to be tested up to the minimum of 60 seconds. A gas detector can be lowered into the confined space using a safety line and a detector that may be used like an aspirator pump. This is why the detector may not be lowered in a confined space.
The ventilator for a fresh air blower has to be set before the operation starts and during the inspection or the maintenance procedures. The air blower ventilation system may be operating in a confined space and it has been tested and also determined to be safer to the entry. The operator has to be equipped with the safety harness with a lifeline and it is attached on a tripod safety system. The approved and also calibrated gas detector should be in operation for the entire time that the employee may be in a confined space. This is important since there is a rapid change in confined space atmosphere.
Before you start to work on the blocked manhole Muswell Hill, you have to make sure that there is another person nearby to stay over the ground to support you when you get problems in the confined place.