New Current Interesting Links - Piping Design (Theory & Practical), Welding

Click through to the pages mentioned below via www.pipingdesign.com's "Current Interesting Links" feature at the main page (these links are also archived at http://www.pipingdesign.com for future reference). these are all PM Engineer links:

Process Piping and the Codes
http://www.pipingdesign.com/designtheory.html

<<In closing, the ASME B 31.3 is the only accepted code that exists for
process piping systems. It is directly required by law in Canada and indirectly in the U.S. by means of OSHA process safety requirements and insurance mandates. However, the fact that the code is required should not be the only reason to compel users to follow it. If followed, it is an excellent means to insure the safe, reliable installation of process piping, as evidenced by the excellent record that exists in chemical plants and petroleum refineries throughout North America.>>

Back to Basics: Backflow Prevention
http://www.pipingdesign.com/designpractical.html

   <<The goal is to assure a backflow event does not cause an unintentional reversal of flow of any substance into the potable water system that can affect water quality by means of a cross-connection. Backflow can happen because of two hydraulic conditions, backpressure and/or backsiphonage. Backpressure is a condition where a greater pressure is created on the outlet side of a piping system than from the inlet side. Pumps, thermal expansion or elevated storage tanks are different examples that can cause this condition to occur. Backsiphonage is a reversal of flow caused by a negative or sub-atmospheric pressure. Broken water mains often cause negative pressures in a potable water system by increasing demand to a point where a negative pressure can be created. >>

Flowrates in Parallel Piping Systems
http://www.pipingdesign.com/designpractical.html

<<Here's what you need to know to analyze the flow rates and head losses
in parallel distribution piping systems.>>

When Brazing Copper Tube is Wrong
http://www.pipingdesign.com/welding.html

<<The dimensions of solder-joint fittings were established around 1950
based on testing that was performed by the National Bureau of Standards (NBS). NBS discovered that solder1 was not very strong and that plenty of overlap (i.e., socket depth) was needed to ensure that soldered joints did not come apart in service.>>

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