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Our company shares with you the following contents below the manhole:

What areas need to be inspected?

1. To inspect the connection between manhole seats and pipeline equipment in sequence, it is necessary to progressively examine the equipment from the upstream and downstream sections of the service pipes, starting with the well-pipe-well-pipe sequence, and then gradually descending to the branch pipes, while expanding the main trunk.

2. The construction method for connecting the manhole seat to the pipeline should be consistent with that used for the same type of connection heads.

3. When connecting the effluent manhole seat and the incoming pipe, a change in diameter is required. When using a reducing coupling, if the incoming pipe is below the diameter of the manhole seat's spout, the top of the pipe should be level. If the effluent pipe's spout extends beyond the pipeline, the bottom outside should be level.

4. When adjusting the inclination using variable angle connectors or spherical connectors for piping, when the pipe diameter is 3.15 mm, tools should be used; chain wrenches are not applicable.

5. For equipment with additional connectors, select the tool based on the drilling standard and the diameter of the connecting pipe to bore holes in the wall. The edges of the hole should be smooth, and the additional connectors of the equipment must not be reversed.