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# Friction Loss Calculations

## Friction Loss Calculations

(OP)
I've visited sites where people were offering or giving links to sites where Excel spreadsheets were available to assist people who are doing friction loss calculations.

Now that I need one I can' remember where to go.

Assistance would be appreciated.

### RE: Friction Loss Calculations

What do you need?

### RE: Friction Loss Calculations

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

### RE: Friction Loss Calculations

(OP)
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.

### RE: Friction Loss Calculations

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

### RE: Friction Loss Calculations

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.

### RE: Friction Loss Calculations

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 www.aft.com 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

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