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Hard Coating under Dynamic Oring

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v7042800

v7042800

Mechanical
Joined
Jul 9, 2009
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20
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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.
 
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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!
 
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