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does anybody know what table D, table E etc and ANSI 300, ANSI 600 means in regards to pipe flanges. I believe that they refer to the pressure rating...

I am installing a new pipe line and would like to incorporate air release valves into the system. The problem is I don't know how often I need these valves. If anyone knows of a formula or book or website or anything that has this information it would be very helpful. Thanks in advance.

I am looking for information on a Polyethylene pipe welding machine e.g. how it works, size of the machine, what it looks like etc. Can anybody refer me to a website?

when i draw a spline in autocad, an area comes up in the properties window....does anyone know what this area refers to? thanks in advance..

I have a reservoir of water with a total head of 100m. I have a pump connected to the tank with a pipe in series at the bottom (i.e H=0m). The pump has a head of 50m for this sized pipe. Would I be able to pump the water 150 m from the bottom (where the pump is)? In other words would I be...