What is slope reversal?
What is slope reversal?
(OP)
Hi Everybody!
In many pipe specs it is mentioned that be sure that the slope is not reversed at any point.
What does it mean? Does it mean that through out the complete piping the slope should be in same direction ? or does it mean that the slope should not be against the flow direction?
thanks in advance
In many pipe specs it is mentioned that be sure that the slope is not reversed at any point.
What does it mean? Does it mean that through out the complete piping the slope should be in same direction ? or does it mean that the slope should not be against the flow direction?
thanks in advance





RE: What is slope reversal?
David
RE: What is slope reversal?
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: What is slope reversal?
I have not heard of the term, so that is my best intuitive guess.
Regards,
SNORGY.
RE: What is slope reversal?
"All pipes must be sloped to a low point drain. Be sure that the slope is not reversed at any point."
The specs belong to sanitary compressed air which comes in contact with product as well as some intermediate products for body care creams.
The plant is for FMCG products making detergents and fabric enhancers. Process piping is mostly sanitary design.
Biginch:
Piping is not gravity flow.
Snorgy:
What is the meaning of "Do not pocket"? Does it mean a U loop should not be in piping with out drain?
Thanks
RE: What is slope reversal?
Due to thermal expansion, we had to specify different installed slopes for each leg of the system so it always had at least the minimum specified slope when the system was hot.
Deflection of the system from dead weight could reverse the slope from the theoretical slope as well.
I think this is what they are talking about.
NozzleTwister
Houston, Texas
RE: What is slope reversal?
It is ambiguous for a pipe that has a drain located somewhere in the middle, in which case you would have to slope both ends toward the drain and therefore would have to reverse the slope.
The conventional way to say this in an English contract document or on a piping drawing is exactly as Snorgy says above, "DO NOT POCKET" while showing the minimum slope value with directional arrow to the nearest appropriate drain for various points on the pipe.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: What is slope reversal?
RE: What is slope reversal?
RE: What is slope reversal?
Some more comments:
Slope not always should be in flow direction. It depends on piping kind. The purpose is that water does no collect - that is all.
RE: What is slope reversal?
The specification seems pretty clear to me. I does help to understand that moisture condensation in compressed air lines is a very common problem. If this is sanitary air that contacts food and cosmetics, you do not want it to contain water that may have been collecting in pipes for days.
RE: What is slope reversal?
Regards,
SNORGY.
RE: What is slope reversal?
Spirax Sarco's literature explains all.
RE: What is slope reversal?
I read in a dictionary of scientific and technical terms that geologists define reverse slope as
RE: What is slope reversal?
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: What is slope reversal?
The same dictionary tells us that Geologists call slope as the inclined surface of any part of the Earth's surface. In addition, the book says same experts define slope failure as
Did you know that in Mining Engineering there is a function named slope engineer?
RE: What is slope reversal?
NozzleTwister
Houston, Texas