Question:

What is a duplex pipe ?

by Guest66014  |  earlier

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I have aslo heard of semi duplex etc.

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  1. Duplex pipe appears to be one pipe inside another with very close fit and from the sites that come up, one of the features is that the outer pipe deals with the environment while the inner pipe deals with the transported material - for example cooling water being carried through a heated and acid water bath.  

    http://www.freepatentsonline.com/5253680...

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