Concrete pipes (reinforced or non-reinforced, NP or P class) are classified as follows:
Class of PipeBrief DescriptionUsage
NP1Non-pressure pipe without reinforcementFor drainage and irrigation. Not suitable with u/g trenches
NP2Reinforced concrete non-pressure pipe (light duty)For drainage, irrigation, culverts (light flow)
NP3Reinforced concrete non-pressure pipe (medium duty)For drainage, irrigation, culverts (medium flow)
NP4Reinforced concrete non-pressure pipe (heavy duty)For drainage, irrigation, culverts (heavy flow)
P1Reinforced concrete pressure pipe (with hydrostatic pressure rating of 0.2 MPa)Where pressure doesn't exceed 2/3rd of hydrostatic pressure rating
P2Reinforced concrete pressure pipe (with hydrostatic pressuer rating of 0.4 MPa)Where pressure doesn't exceed 1/2 of hydrostatic pressure rating
P3Reinforced concrete pressure pipe (with hydrostatic pressuer rating of 0.6 MPa)Where pressure doesn't exceed 1/2 of hydrostatic pressure rating
3/16/2011 01:35:11 pm

Do not, for one repulse, give up the purpose that you resolved to effect.

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1/25/2012 07:37:30 am

THX for info

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will return shortly

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3/25/2012 03:42:35 pm

Many thanks for details

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3/29/2012 05:28:35 pm

nice post

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3/29/2012 07:00:41 pm

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5/6/2012 05:15:20 pm

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This, unfortunately, is just tracing. Andy Warhol and many other artist have already exhausted this kind of statement. It says more about old media artists struggling to find their own relevance in a hyper-accelerated digital world.

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8/28/2012 01:28:20 pm

I see it more of the same "He did it first" type of art that ultimately has little long-term resonance or connection to most people.

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9/25/2012 02:31:01 pm

Appreciate your information

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