How do you define drip level, with relation to feedwater heaters in a steam power plant?
The closest thing I can think of regarding drip level is in level measurment in a direct contact deareating feed water heater. (Known as a DC heater) Level measurment in a tank can be done by measuring pressure at the bottom of a tank. Knowing density of the liquid the depth or liquid level can be determined. If the tank is unpressurized a single ended pressure measurment can be taken using atmospheric pressure as a reference. Since atmospheric pressure is relatively stable compared to a tank level it is easy to equate a liquid pressure to a tank level. This single ended pressure measurment that is connected at the bottom of teh tank is sometimes known as a the dynamic leg of a pressure transmitter because its prssure changes with tank level. However in a pressurized vessle like a boiler drum or a DC heater changes in pressure come not only from a change in liquid level by also by a change in operating pressure acticng upone the surface of the liquid. A single ended pressure measurment
