The installation procedure of ductile iron pipe connection is as follows:
Clean socket and spigot → clean rubber ring → upper rubber ring → lower pipe (discharge pipe) → brush lubricant on socket surface and rubber ring → push pipe to insert into socket → check.
① Cleaning the nozzle: clean all the sundries in the socket.
② Clean up the rubber ring and upper rubber ring: clean up the adhesive on the rubber ring, bend the rubber ring into "plum blossom" or "8" shape and put it into the socket groove, and press it along the whole rubber ring by hand, or smash it with a rubber hammer to ensure that all parts of the rubber ring are not warped or twisted and evenly stuck in the groove.
③ Apply lubricant on the outer surface of socket and apron: apply lubricant evenly on the inner surface of apron installed at socket, and apply lubricant on the outer surface of socket. When applying lubricant on the outer surface of socket, all the socket parts outside the socket line shall be evenly brushed.
④ Pipe laying: the pipe shall be laid down to the bottom of the groove according to the requirements of the pipe, usually by manual laying or mechanical laying.
⑤ Installation of machinery and equipment: the prepared machinery and equipment shall be installed in place, and the cleaned pipe parts shall not be polluted again during installation.