Snap-Tite Quick Coupling Pressure Drop 2

[22west]

Does anyone know how to calculate the pressure drop across a quick coupling? Or atleast know of a method of accurately extrapolate published data? The catalog data typically gives the pressure drop using oil or water as a test media at room temperature or slightly warmer.

See page 2 here :

http://www.tridentaustralia.com.au/userfiles/file/71s.pdf

I would like to find the pressure drop for a Snap-Tipe quick coupling using a different fluid at a much lower temperature (175 cSt viscosity).

Staubli will calculate this for you if you give them all the information on the media - but Snap-Tite won't do it.

Staubli says they use an "equivalent pipe" method - I'm not sure what this is.

Can anyone help?

 

[MikeHalloran]

The phrase "equivalent pipe method" suggests a way to proceed:

Find or write a spreadsheet that calculates pressure drop of a straight pipe, given the pipe length and size and fluid parameters.
Increase the pipe length until the pressure drop calculates out the same as the coupling you are modeling.
Then leave the pipe length unchanged, and change the fluid properties to get your new pressure drop.




Mike Halloran
Pembroke Pines, FL, USA

 

[22west]

I just worked it out like you said using a Staubli coupling and I came within 1% of the drop that Staubli calculated.
Thanks for your help!