Do we need to make changes to our boiler feed?

3000TDS is normally the blow-down concentration set-point for a low pressure (<200psi) industrial steam boiler, as it will begin to prime at concentrations much above this.

Look at the wider picture. The costs of treating the water per unit volume will be more than outweighed by the savings to be made in lower blowdown frequency in terms of the energy to be saved, make-up water volumetric charges to be saved and waste water volumetric disposal charges saved. Go for it with both hands before the treatment company wanders off.

Also go for maximising the recovery and reuse of steam condensate, as it's pretty pure water and needs minimal polishing prior to reuse. A factory in Dagenham saved a fortune starting from the early 1990s by doing this. Google 'Ogden Pumps' and take it from there.

3000TDS cannot be considered 'potable water'; it will have a significant taste and will be unpalatable. Anything below 750TDS and above 100TDS will be approaching 'potable', in World Health Organisation terms

dear;

thank you for quick replay, am power saving adviser in one of my project i suppmet the R/O system as power saving measure to reduce the blowdown and save the heat the client clamed that after installing the R/O system his chemecal bill increse from 1200 USD to 3000 USD which mean that what we saved in heat he paied it in chemecal becaus of that am asking is it possibel

Of course it is possible. Local economics make it desirable or not, as the case may be. It pays to look at the bigger picture, as suggested, rather than focus on treatment costs only.

The water treatment company is right if all RO system operating costs are taken into account. You have to look at the total cost of ownership or life cycle cost. You may save on the antiscaling part of the treatment program but you will find that raw water consumtion will increase even after savings on the blow down because the RO system will reject 30-40% as high salinity effluent and then some more on the filter wash cycle .There may be some waste water treatment issues too depending on where you are located. Your electric bill will be affected by the additional pumping required by the RO filter and RO water buffer tank. And you´ll have to take a depreciation charge on the capital equipment plus the recurring expense of replacing the fouled membranes. Ask to your treatment provider to show you the detailed calculation and comparative analisis before you commit yourself to RO.

it is better to use r o water. the treatment cost must be less than the cost of this your potable water. the water treatment company must rethink over the issue. you may also go for other treatment company's opinion by sending him the available water sample.