Hard Coating under Dynamic Oring

[v7042800]

I have a question about tungsten carbide coating on a seal sleeve. The sevice is high-pressure crude with trace H2S. My question is: which grade is better, cobalt bound or nickel bound? Thank you.

 

[flexibox]

What you should consider is what will potentially corrode the filler. If your crude contains traces of water then use Ni bound Tungsten because colbilt is likely to corrode. I have always used Ni bound and never had a problem. Also have the surface with a super finish if it is for the dynamic oring of a mechanical seal!

 

[v7042800]

thank you, Flexibox..!