Answer Posted / suresh

the Non Pressure RCC hume pipes of class 2 are known as light duty hume pipes used for sewers,irrigation and light traffic culverts.their thickness varies from 25 to 110 mmfor 8cm dia and 2.2m dia respectively.
for NP3 (medium duty) the thickness varies from 25 to 215mm
for 8cm dia and 2.6m dia respectively.
there is NP4 class also. all yhe remaining being same except the thickness.
IS:458-1988 deals with the requirements.

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