condensate tank replace

Timco

Well, this is a 60 unit building, and the boilers send out a lot of steam, thus the old cond tank was constantly pumping. Not sure if that would keep up. Other issue is I need a solution yesterday, and only a duplex style larger tank is on the shelf. I am under the impression that the float switch is adjusted to maintain the correct level in the boilers based on water level in the tank, and the LWCO adds water if the boiler level drops too far down and there is no water to pump, which should be rarely...

Tim

Timco

I have an account where a cond tank is totally gone. It is a simplex setup, feeding 3 400K boilers. Current tank is like 15 gal or so, but I have been told I need 21 gal for that many BTUs. Float on new (bigger / taller) tank will still control water line in boilers correct with taller tank, correct? Can't seem to picture it with a taller tank.

Tim

nicholas bonham-carter

tank

could this setup work in such a case?--nbc


http://forums.invision.net/Thread.cfm?CFApp=2&&Message_ID=420500&_#Message420500

Brad White_203

Setup

If the pumps respond to how full the tank is, it is just a condensate pump. If the boiler water level calls, it is a boiler feed pump (in very simple terms).

The way I size such a receiver where it sees all of the returning condensate, is for 20 minutes storage.

The feed pump rate is 2.0 to 3.0 times the evaporating rate.

Thus, if you have a steam output of (taking a guess here), 1,000 lbs. per hour, that is 334 pounds in 20 minutes or about 40 gallons storage.

The feed rate at the same steaming rate would be

(1,000 PPH x 3.0) divided by (8.33x60)=6.0 GPM.

I would check both pumping rate and receiver size. It may also be that your impellers are worn (a lot of abuse those take). So an eroded impeller pumps a lot less so it runs and runs...

Unknown

Condensate tank

Tim, Brad is the man, but maybe you can get some info from this too.

Dave

Timco

This is a very small condensate tank, and I can see where that is why it runs soo much. Constantly discharging because it takes very little water to fill it. Just waiting on a OK from cust now...I would love to ditch the tank.

Tim