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Can anyone provide reputatble references as to the most appropriate coefficient of friction to be used for steel-steel contact for piping systems. Thanks, Sitidor.

I agree entirely with jlcochran1. I have purchased hundreds of vessels in the past and I strongley suggest that you openly communicate with your fabricator, otherwise you can just about gaurantee that the final product will not be what you want nor expected. Although it sounds a simple change...

When there is no bellows in the piping,then the only thrust that could act on the pump flange is when there is a reducer in the line of the pump nozzle. In these cases, the thrust load is equivalent to the difference in cross sectional area's of the two pipe sizes multiplied by the pressure...

Consider using a refractory lined slide valve or a Tyco Vannessa valve (ie. triple offset buterfly).

Also considerlimiting heat inpu, as this may affect hardness.