Weld 2 elbows 90 degree
Weld 2 elbows 90 degree
(OP)
what is the minimum allowed distance to assemble 2 elbows 90 degree (bell and spigot), ductile iron, 12", underground, used for fire system, working pressure 10 bar.
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RE: Weld 2 elbows 90 degree
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RE: Weld 2 elbows 90 degree
Two 90's out of plane create a swirl that is still persistent after a mile of Pipe (testing by Elizabeth Laws in the UK in the early 1990's to understand how to eliminate swirl in gas measurement, led to the development of the Laws Plate that worked great but cost $10k each). Dr. Laws found that adding a 5D pup between the 90's prevented the creation of the persistent swirl. Swirl in a flow increases the energy loss per unit length and should be avoided where practical. I've generally found adding a 30 inch pup to a 6-inch line could often be made "practical" (sometimes it just can't be and I accept a higher dP).
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: Weld 2 elbows 90 degree
There is though a discrepancy in the title of this post "WELD 2 elbows..." and the text "ductile Iron", "Bell and Spigot" implies push fit connections, not welded.
For a Fire Water system it might not matter so much as the systems Zdas04 was referring to.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.