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Glycerine in Boiler

Glycerine in Boiler

Glycerine in Boiler

(OP)
I'm working with a guy using a 30-40% glycerine solution directly in his fire tube hot water boiler.

I have had to replace seals on the pumps due to grit in the system a number of times.  I think the glycerine is burning on the tubes or there is some other type of reaction.

There is also CPVC and standard black pipe.

Any ideas???

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