Low Shear Valve . 1

[elangovan8391]

Hi all,

I am working on a oil and Gas project, Customer has requested to offer a Low shear valve for Oil+Water service. But in the data sheet it is mentioned Globe valve. As per my Experience it should be to prevent Emulsification. but i have no idea about the trims used for this service. Can some one suggest me wat type of valve to choose? (Eccentric plug, Axial valve,Globe valve)?

Elango
Dubai
+971558373009

 

[kishoredevadoss9704]

Refer competitors for trim material selection so u get a plot which is suitable

 

[kishoredevadoss9704]

I mean catalogues and their applications

 

[cam72]

Check with SEVERN GLOCON. If I am not wrong "LOW SHEAR"patent and design is by SG. They are pioneers in Low Shear Control Valve. There is one more company in Holland , but don't remember the name.

 

[elangovan8391]

Thanks cam72's. Csn you please explain, what is the purpose of using Low shear valve? and how does it work?

 

[EmmanuelTop]

The purpose of these valves is to reduce turbulence and hence decrease emulsification (= reduce dispersion of oil in water, and dispersion of water in oil). There is a video clip on Typhonix site showing principle of operation:

http://www.typhonix.com/technology-and-products/typhonix-low-shear-valves/watch-the-video

As pressure drop across a valve increases, more tight emulsion is created between hydrocarbon and aqueous phase. These valves offer "more gentle" pressure drop, apparently through a cyclonic design consisting of multiple tangential orifices and a venturi-shaped discharge. See also

http://etc14.ens-lyon.fr/openconf/m...c_proceedings&action=view.php&a=Poster&id=397

and

http://www.typhonix.com/technology-and-products/typhonix-low-shear-valves/faq

Dejan IVANOVIC
Process Engineer, MSChE

 

[RobV]

In recent years alot of research has been done in reducing shear forces in turbulent flow, specifically in valves and pumps. Typhonix AS has indeed been a leader in this research. Together with Mokveld (

http://www.mokveld.com)

they have developed a system in which the dispersed flow will have larger droplets than in conventional valves in the valve outlet. Effectively allowing better separation in gravity based separators.