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[Crossir]

I wanted to add an update to my original post/question. I moved the circulator from the basement to the back of the boiler last weekend. That eliminated all noises no matter what the water temps are. You can hardly hear the hum of the motor and no water noise at all. Thanks for the advise, I would of never thought of the lower vapor point in a vacuum.

[mlappin]

 

[dukethebeagle]

sounds like the water is thinner then the pump can push.mine does the same
when it gets real hot it gurgles and makes noise.
cause is poor circulation.
i don't worry about it.

[RSI]

With the piping mentioned in the OP, I would estimate that the 0011 pump would be running at around 17-20' of head and 14-15 GPM. If 15 GPM would flow to the point where the pump was located by gravity, it would never see negative pressure. Unless the boiler was a ways up hill, I doubt it would flow that much.

As mentioned above, negative pressure at the pump inlet is not good.

[mlappin]

With the piping mentioned in the OP, I would estimate that the 0011 pump would be running at around 17-20' of head and 14-15 GPM. If 15 GPM would flow to the point where the pump was located by gravity, it would never see negative pressure. Unless the boiler was a ways up hill, I doubt it would flow that much.

As mentioned above, negative pressure at the pump inlet is not good.

Doesn’t take much to restrict flow when your trying to pull water. Different situation but we always used to run a strainer BEFORE our ag sprayer pumps, hydraulic drives and those babies really sing. Theory was a strainer before would catch any gunk and prolong pump life, even using an oversized strainer to increase flow still restricted flow enough that every couple of years the seal would go out, removed the strainers 5 years or so ago and haven’t replaced a seal yet.