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I am hoping someone can explain the following situation.
My home has baseboard hot water heating using an oil fired furnace. The water piping is a closed loop system. There is an inlet valve for make-up water, but the valve is closed. There is an expansion tank on the outlet water pipe from the furnace, and the air pressure in the tank is at 12 psi (I checked). There is an air purge on the outlet water pipe from the furnace, and it does work because I do on occasion hear air escaping from the purge valve.
Occasionally I hear gurgling in the water piping in the house. I assume that the gurgling noise is due to air pockets in the water. The furnace is 4 years old and I have seen no water leaks that might allow air to enter the system. I never have to add make-up water to maintain the water pressure. I have seen no water leaks from the system. I assume that if water was leaking, the water pressure would decrease over time.
What is interesting is that the gurgling is noise is heard only every few days. Strange!!
If I have an air purge, I would think that the air would eventually be purged and I would no longer hear the gurgling. And since the water piping is a closed loop system, no air can enter the piping. I would think that eventually all of the air would be purged and I would no longer hear the gurgling. So why does the gurgling continue year after year? What am I not understanding?
My home has baseboard hot water heating using an oil fired furnace. The water piping is a closed loop system. There is an inlet valve for make-up water, but the valve is closed. There is an expansion tank on the outlet water pipe from the furnace, and the air pressure in the tank is at 12 psi (I checked). There is an air purge on the outlet water pipe from the furnace, and it does work because I do on occasion hear air escaping from the purge valve.
Occasionally I hear gurgling in the water piping in the house. I assume that the gurgling noise is due to air pockets in the water. The furnace is 4 years old and I have seen no water leaks that might allow air to enter the system. I never have to add make-up water to maintain the water pressure. I have seen no water leaks from the system. I assume that if water was leaking, the water pressure would decrease over time.
What is interesting is that the gurgling is noise is heard only every few days. Strange!!
If I have an air purge, I would think that the air would eventually be purged and I would no longer hear the gurgling. And since the water piping is a closed loop system, no air can enter the piping. I would think that eventually all of the air would be purged and I would no longer hear the gurgling. So why does the gurgling continue year after year? What am I not understanding?
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