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Dear N.J.Suresh,

GI pipes are not used. Generally in sewage rising main C.I./D.I/HDPE pipes are used. For more information please refer CPHEEO Manual for Sewerage and Sewage treatment. Kindly go through the link here: http://cpheeo.nic.in/

Regards,

V. K. Babbar
Chief Engineer (Civil)
Delhi Jal Board
New Delhi-110005

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