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Friction Loss Calculations
- Thread starter Matador
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If you're after friction losses in hydraulic calculations, try browsing the "Piping & fluid mechanics engineering" or the "Pump Engineering" forums. There are several threads there about hydraulic calculations.
Or type "friction" in the search box. This may give nearly all of them.
Regards
Mogens
Or type "friction" in the search box. This may give nearly all of them.
Regards
Mogens
- Thread starter
- #4
I would like to combine two seperate sections of pipe and put the entire flow through a static mixer, then split them again using control valves on each branch. The existing piping system pumps 6% pulp stock and there are 3 pumps pumping into each header.
The static mixer has a pressure drop varies from 2 psi to 5 psi depending on throughput, which puts the existing pumping capacity in question.
The original designer (NLK Consultants) used K values for the fittings to determine their pressure drop. The K values they used look like they are from Crane but not exactly the same.
What I need is a spredsheet to check the pressure drop at min and max flows. (ie 800, 1000, & 1200 MTD at consistencies from 4.0% to 6.0%) you can appreciate the work involved if I don't use a spreadsheet.
This is all being done for more operating flexibility.
The static mixer has a pressure drop varies from 2 psi to 5 psi depending on throughput, which puts the existing pumping capacity in question.
The original designer (NLK Consultants) used K values for the fittings to determine their pressure drop. The K values they used look like they are from Crane but not exactly the same.
What I need is a spredsheet to check the pressure drop at min and max flows. (ie 800, 1000, & 1200 MTD at consistencies from 4.0% to 6.0%) you can appreciate the work involved if I don't use a spreadsheet.
This is all being done for more operating flexibility.
Matador,
I have several fluid flow spreadsheets that I've developed for point to point analysis, based upon Crane TP 410. I also have one for paper-stock utilizing the methodology as presented in Goulds Pump Engineering.
send it to me at dmcoffman@aol.com
I have several fluid flow spreadsheets that I've developed for point to point analysis, based upon Crane TP 410. I also have one for paper-stock utilizing the methodology as presented in Goulds Pump Engineering.
send it to me at dmcoffman@aol.com
Guest
I would be a little cautious about using standard K values to derive pressure drop for fittings etc. At 6% stock I reckon you will be in a non-Newtonion Flow regime and standard K values may not be as accurate as you need. My company (Statiflo) supply static mixers - (I can say that as you already have one, so I can't be accused of trying to sell you one !!)
When we design mixers for stock suspensions, we derive a "Pseudo" Reynolds number to compensate for the non-Newtonion flow regime. Its not perfect, but it gives a pretty good prediction of what sort of mixture quality & pressure drop can be expected.
When we design mixers for stock suspensions, we derive a "Pseudo" Reynolds number to compensate for the non-Newtonion flow regime. Its not perfect, but it gives a pretty good prediction of what sort of mixture quality & pressure drop can be expected.
I suggest you invest in AFT's Fathom as the programme models non Newtonian fluids. In particular it has two standard approaches for paper stock. Go to where you download demos and an explanation of the paper stock models.
I run their software as a part of a piping design service but I am in Australia and you may not be totally comfortable with someone on the other side of the globe doing you engineering design.
Speak to AFT they may be able to suggest someone in your home town. If not I am blenrayaust@yahoo.co.uk
cheers
Geoff Stone
I run their software as a part of a piping design service but I am in Australia and you may not be totally comfortable with someone on the other side of the globe doing you engineering design.
Speak to AFT they may be able to suggest someone in your home town. If not I am blenrayaust@yahoo.co.uk
cheers
Geoff Stone
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