4 replies to this topic

[Bren]

Hi guys,

 

Guidance documents on static will typically quote a figure of 1 m/s as the maximum permissible velocity through a pipe containing non-polar solvents.

 

In my case, I'm working on an application involving heptane flowing under gravity, where we have a velocity > 1m/s, where we cannot add restrictions to the flow (as line contains polymers which tend to casue blockages) and where the line is only partially full.

 

Does the 1m/s rule apply to partially full pipes, or would it be restricted to flooded, fully turbulent flow?

My thoughts are that static wouldnt be generated to the same extent, as with a flooded pipe you have a quantity of heptane towards the middle of the pipe that is not earthed, unlike in my case where its more laminar-type shearing of the fluid against the lower side of the pipe.  

 

But these are just my thoughts - has anyone any thoughts/experience on this matter?

 

Cheers!

[TS1979]

Static head is equivalent to potential energy, which is only related to elevation and not related to full or partial full piping. If you know the elevation of the point to the reference point, you know the static head, which is the elevation difference between the point you want to know and the reference point.

[thorium90]

I believe he refers to static electricity not static head.

[breizh]

Consider this resource and recommendations .

 

 http://www.iapa.ca/p...Electricity.pdf

 

Breizh

[thorium90]

Perhaps the following links might be helpful

 

http://www.google.co....45373924,d.bmk

 

http://www.srbrowne....klet/index.html