Drop Connection Clause Samples
Drop Connection. In cases where branch pipe sewer enters the manhole of main pipe sewer at level higher than the main sewer by more than 600mm a drop connection should be provided. A typical drawing for drop connection shall be supplied to the contractor. For 150 and 250mm main line, the difference in level between the water line (peak flow-level) and the invert level of branch line is less than 60cm, a drop connection may be provided within the manhole by giving ramp. If the difference in level is more than 60cm, the drop should be provided externally.
Drop Connection. (i) Drop connections shall be provided between branch sewer and main sewer or in the main sewer itself in the steep ground when the difference in the invert level of the two exceeds 45 cm of the required size.
(ii) Drop connections from the gully trap to main sewer on rectangular manholes shall be made inside the manhole and shall have H.C.I. special type door on top and heel rest bend at bottom connected by a H.C.I. pipe. This pipe shall be supported by holder bat clamp at 180 cm intervals with one clamp for each drop connection. All joints shall be lead caulked joints 25 cm deep.
(iii) Drop connections from branch sewer to main sewer shall be made outside the manhole wall with glazed stone ware pipe tee connection, vertical pipe and bend at the bottom. The top of the tee shall be finished up to the surface level and provided with a C.I. hinged type frame and cover 30 cm x 30cm. The connection shall be embedded in the cement concrete 1:2:4 mix 15 cm all round the pipe and tee upto the surface chamber of the tee.
(iv) Drop connection made from vertical stack directly into the manhole shall not be considered as drop connection.