Sting wrote:long read - but the link I posted in this thread appeared to have helped the OP and his pressure drama
maybe you too??
thanks for the link, I've read it twice, it makes sense and I think I'll buy the book:) good stuff. However I don't think it quite addresses what I am seeing in this case. I am consistently seeing a pressure of 18-20 regardless of circulating or cycling of the boiler.
stoker-man wrote:The expansion tank sounds hollow when you rap it with your knuckles. If you have an increase in pressure along with an increase in temperature, check the circulator. If the temperature doesn't increase, check the coil, as stated.
The pressure does not increase with temp. just with time. I shut off the infeed regulator yesterday for about 4 hours and did not have any increase in pressure over that time, there was actually a small decrease. After opening the infeed again the pressure steadily climbed back up to 18 which leads me to believe it is the cause of this higher pressure that I'm getting. There's very little change in pressure once it gets up there, but I couldn't understand why it was going that high. Now to figure the best way to either clean or replace that regulator
I do have two expansion tanks one just off the oil boiler and then another just off the coal boiler, both sound hollow on the bottom and solid on the top. I haven't checked to see what the pressure is in the tanks..