VALVE PACKING SEALANT TESTING

[Bambie]

thread378-336794

I am looking for a recommendation for a laboratory that performs viscosity testing of valve packing sealants that are very viscous, require high pressures to flow and likely non-Newtonian.

The intent is to predict whether control valve response will change due to viscous drag from the sealant after being injected into the stuffing box through the packing leak-off line.

I have attached a proposed test procedure and analytical basis and would appreciate constructive comments on my approach.

 

[Bambie]

The key assumption is that the average velocity produced by a pressure gradient in a cylinder creates shear stresses and rates that are equivalent to the shear stresses and rates created by the inner cylinder of an annulus moving at that velocity.

Is this a reasonable assumption?

 

[bcd]

Yarmouth research laboratory in Maine? They do a lot of different types of valve testing.

 

[Bambie]

Thanks bcd, I will check them out.

 

[Bambie]

bcd,

No joy from Yarmouth - left an inquiry with Anton Parr.