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Thanks guys. I will try and revert to all your replies. The first error I made in explaining is that we have 11 bar boilers, 14 bar, 17 bar and 20 bar boilers, not that the pressure in the boiler is designed to vary from 11-20 bar. So we intent to keep the liquid level of water in the boiler...

We will use a VFD and a PI Controller for varying the head of the pump. We do not want to change our pumps because of cost constraints unfortunately.

Thanks quark. The problem is our whole water level regulation control algorithm is not working right. We cant keep the water fixed at the average water level however the water level is modulating about the required set point. We understand the superiority of 3 element control but then we trying...

Thanks guys for your input. Our philosophy is that once the differential pressure across the pump is found we can then use the signal from the DP cell through a controller and a VFD to make the pump head to be always greater than the boiler operating pressure hence ensuring flow. We also have...

I trust you are well. I have just started at this big boiler making company and there is a problem we are trying to fix with regards to water level in the boiler. We are looking into installing a differential pressure cell across the pump, such that the head of the pump can be changed as the...