Applications that involve particles in fuild are referred as dirty service which can be quite challenging for control valves, especially when cavitation or outgassing occurs. Control valve can be badly damaged in a very short period of time if a non proper valve design is offered. Wonder how Fisher addresses those problems associated with dirty particles in demanding applications? Click below to find out.
http://www.documentation.emersonprocess.com/groups/public/documents/brochures/d351830x012.pdf
I am a severe service engineer of Fisher control valve business unit, Emerson Process Management.
Hi Sabrina,
In my experiences with upstream O&G customers, one of the repeated concerns is the plugging of trims. From the attachement, I see that the designs varies from the normal anti-cavition trims. Is this something new from Emerson? And how would this design addresses plugging in high pressure drop applications? Appreciate your help. Thank you.
In reply to ShuJun.koh:
Hi ShuJun,
Thanks for your question. Fisher offers a broad range of dirty service products as you can find in above link. NotchfloDST, DST and DST-G are in dirty serive product family of Fisher. All those products feature large flow passages that can pass the particulate without plugging. Like you said, they indeed vary from conventional anti-cavitation trims which have quite small holes thereby very prone to be plugged if there is dirty particles entrained in fluid.
Actually Fisher dity service products are not that new. There are thousands of NotchfloDST, DST installed in very demanding applications in Oil&Gas, refinery, and power plant industry. By offering proper selected body/trim material with excellent corrosion/erosion resistance and mult-stage 3D dimensional flow along with anti-plugging design, Fisher dirty service products are field proved as excellent solutions to address both cavitation and particles.