Hello Everyone.

I have an Extrol Epansion Tank Model #30 on top of my Oil Burner. We have hot water Cast Iron Radiators. No steam.

I have a pin hole leak in my Extrol Expansion Tank. I plugged the hole with Oatey "Fix it Stick". I plugged the hole probably 3 weeks ago. I realize I need to change out the tank. I actually bought an new Extrol Expansion Tank. I just haven't had the time to install the new Extrol tank.
My question is, I noticed my pressure gauge on the Oil Burner reading 40 lbs Psi. The pressure relief valve is not dripping any water. Can I just remove the plastic cover/cap on top of the expansion tank and let some air out of that air valve on top of the expansion tank ?

I came back to edit my question at 1:45 Am in the morning to add pictures thinking maybe pictures would be helpful.

















Lee



Edited 2 times.

You need to replace that expansion tank. While it's off make sure the gauge reads zero. If not replace the gauge. If it goes high again after filling the system you may need to repair or replace the pressure reducing valve (last 3 pictures).

Thank you very much !

One more question.

Boiler Pressure per gauge is at 30 Psi, after I installed the new expansion Tank. Obviously the boiler pressure is too high. I believe pressure should be at 12 Psi to 15 Psi . The boiler, if I remember correctly, always ran at 20 Psi. I apparently made a mistake during the installation process. Presently, I tapped on the new expansion tank and the new expansion tank seems to be half full/ half empty. Because of the tapping on the expansion tank I believe the tank is still good and not ruined. I thought I ruined the expansion tank when I added air to the expansion tank with my compressor. Tank is definitely still good. I thought I needed to add air to the expansion tank because my tire pressure gauge did not register or move when I checked the air pressure(with two tire pressure gauges).

Question : do I let air out of expansion tank at the valve ? Or do I put more air in the expansion tank ?
Do I first need to isolate the top floor of the radiators or close off/ isolate the water to the cast iron radiator on the top floor(single floor Ranch house) then once I have closed off or isolated the top floor - turn the boiler drain valve and drain the boiler and subsequently the water will drain out of the expansion tank while watching my boiler pressure gauge and then address the expansion tank either add more air or take air out at the valve of the expansion tank ?

Appreciate some help big time !

The pressure reducing valve sets the pressure in your system. Assuming you haven't changed the adjustment screw it's probably letting too much water into your boiler. You can try adjusting it but you'll probably end up rebuilding or replacing it. As long as the relief valve isn't dripping too much pressure isn't a big problem.

Hi Tom130 !

Thank you for all your help. I am guessing the original Plumber who installed the Boiler must have set the Pressure Reducing Valve to 20 Psi. I noticed when I opened the boiler drain valve(red handle) at the bottom of the boiler, the pressure kept or stayed at 20 Psi. The Pressure Relief Valve I just installed. So the Pressure Relief Valve is new. The Pressure Relief Valve is not dripping. I should be Ok it seems.

During the original installation of a boiler ; does the Plumber measure the water pressure coming from our Town and then adjust the water Pressure Reducing Valve to match the pressure the boiler manufacturer requires ? I looked at the Pressure Reducing Valve it says on the label that it is set at 12 Psi from Bell and Gossett. Apparently either the Pressure Reducing Valve is set at 20 Psi by the Plumber at the time of original installation of the boiler or the Pressure Reducing Valve is broken ?

I still kind of think I screwed up the installation of the expansion tank. I am really glad the Pressure Relief Valve is not dripping. I did kind of think that is what matters in the long run. Sorry if I am being a Pain in the Rear End over here in NJ(approximately 45 minutes from the City) ! I have always been interested in Plumbing and Electrical, actually, and having "understanding" is really interesting !

If I remember the boiler always had a pressure of approximately 20 Psi now the pressure is just under 30 Psi. That is why I believe I screwed up the install of the expansion tank. I do realize that for a "Homeowner" the standards are less. I certainly am not a Professional or a trained Tradesman. I am able to keep the "lights on" by doing a thing or two whenever I can. Well, Tom thanks for all your help. Again sorry for going on and on. I do find Plumbing interesting. Plumbing is, in my opinion, the most important Trade their is. Without Water Humans could not live. Thank You. You the Man !