HVOF Coating Thickness
HVOF Coating Thickness
(OP)
I've been looking into hardface coatings on pipeline Ball Valves and was wondering what the typical coating thickness was for HVOF Tungsten Carbide on balls and seats. Are there specific minimum/maximum coating thickness limits that give the best performance?
Does the thickness put down depend on the properties of the fluid in the line? i.e. thicker coating to reduce effects of erosion?
Thanks
Does the thickness put down depend on the properties of the fluid in the line? i.e. thicker coating to reduce effects of erosion?
Thanks





RE: HVOF Coating Thickness
RE: HVOF Coating Thickness
Valvit is correct 400 mic is a good place to start but still its depends upon as you said the fluid in the line?
Mostly we are applying bond arc after the surface preperation of the base material and then final coating, which gives good strenghth.
RE: HVOF Coating Thickness
Applied on gate and ball valves all sizes in direct contact with well stream. Base material need to be CRA materials as SuperDuplex or Inconel for hardness. This to avoid denting.
RE: HVOF Coating Thickness
RE: HVOF Coating Thickness
You may refer to the old revision of TOTAL Spec. In my understanding, TOTAL Spec requires 300 micron coating thickness only...
RE: HVOF Coating Thickness
A few other things I haven't come across are how much the ball diameter affects the decision - presumably coating thickness will change with ball diameter, or does it stay the same? Are thicknesses on ball valve gates and seats typically the same as on gate valves?