Big Jim posted:smd4 posted:you're adding cold water to the boiler and cooling it off, so the pressure goes down.Steve,
I am surprised that YOU, of all people, would say that! You are most definitely not putting cold water in. Much to the contrary, the water is very hot. The loss of pressure is that you are using boiler pressure to operate the injector.Nope! That has NOTHING to do with using the injector, since the boiler pressure through the injector goes right back into the boiler. The boiler pressure drops a bit because the injector supplies water that is NOT as hot as the large volume of water that is already in the boiler. No, the injector doesn't supply "cold water", but it DOES supply water that is "cooler" than the boiler water, and on smaller boilers, the pressure can drop significantly if the injector is left running too long.
Besides, what you might consider "very hot", say 180 degrees?, is no where near the boiler water temperature, anyway. On the other hand, a Worthington Feedwater System will pump "cold water" into the boiler if there is no exhaust steam to preheat the water to temps above 180 degrees.
