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General Outdoor Furnace Discussion / overpressure but not overheating

« on: January 12, 2014, 10:38:50 AM »

I have an old Kerr Titan 101 indoor wood boiler.  The Kerr is tee'd into a System 2000 oil boiler and I have run the system as plumbed with no problem for years.  I am having continuous problems this year with the pressure at the boiler building up to over 30psi, releasing the relief valve, when the temp is running at normal (right around 180F).  At the same time this is happening, the pressure downstream at the System 2000 is only 20psi and the temp is the same 180F.  The only components between the Kerr gauge and the other gauge are the dump aquastat, a flowcheck, and a hand valve.  All of this tells me that there is a constriction somewhere between the two gauges, but I could be wrong.  Sometimes the pressure drops back below 30psi on its own, and sometimes I seem to have success reducing the pressure by quickly closing and opening the hand valve, which I interpreted as clearing whatever was causing the constriction.  I also took out the plug in the flocheck to see if I could identify blockage there, but it seems fine as far as I can tell.  The last thing I did was loosen the thumbscrew on the flocheck to hold it open.  I tried to attach pictures of each gauge and component. but the site is not allowing it.  Any ideas on what the problem could be and/or how to fix it would be appreciated.

It also looks like the feedwater make-up regulator is running normally, as the 30psi relief right downstream  of that is not releasing, and when I closed the shutoff valve for the feedwater it did not affect the pressure.