BFP Recirculation Valves

[mdecaprio]

Aloha,

I am an operations engineer with the Hawaiian Electric Company. We have been plagued by continuous probles with our boiler feed pump recirculation valves. I was wondering if anyone could give information as to what type of valves you use at your plants.

Things to consider are:
Unlike a mainland utility our grid is in isolation. This requires even our base load units to cycle. What I am saying is that even our units that stay online 24 hours a day, come down to a low power at night due to low system load.
This meens
1-our BFP recirc valves cycle almost every day.
2-Unlike most, more modern units our BFP recirc discharges straight to the condesor, NOT to a deairator.
3-Our feedpump discharge pressure when the valve opens is around 3000psig and the condensor is around 30" of vacuum.
4-OUr feedwater temp at this point is between 250-280F

So, we have this extremely large d/p and flashing occuring at the valve. OUr valves last lest then a few months.

We tried duabla(spelling?), fisher, mogas and other valves. Currintly we have had mild success with valtek and are considering cci drag valves.

Any comments as to what works best for you guys would be very much appreciated.

Aloha,
Mike
heco

 

[JEB66]

with all the money you spent on valve, could not you make a case to send the recirc water to the DEA?

 

[toothless]

Try this vendor. He has exactly what you are looking for. His device takes the pressure drop so your valve doesn't have to.

CU Services LLC
725 Parkview Cir
Elk Grove, IL 60007
Phone 888-394-2303

http://www.cuservices.net