Flowrate of oil in an inclined returnpipe

[Pieterv]

Hey,
I try to estimate the possible flowrate of oil in a return pipe (pressureless) taking into account the viscosity, type of pipe,filling of the pipe. For water I use formula of Bazin. For oil I have no idea how to calculate.
can you help me with this?
Thanks

 

[TD2K]

Do you have someone in the office with a copy of Crane's Technical paper 410 "Flow of fluids through valves, fittings and pipes"? That would be the easiest approach in my opinion and Crane will allow you to solve for the flow rate with the pipe either full or partially full (though the latter is going to be a trial and error solution).

I don't use any of the Bazin formulas so I can't suggest how to adjust it for oil's properties.

If you don't have the Crane booklet you can order it off the Internet and it's got some excellent worked examples in it.