Steam trap?

Looks like a condensate tank, what is it doing besides leaking?

Bob

This is a duplex condensate return pump set. The pumps are controlled by the mechanical alternating float switch; that thing on the right side (when looking at the pumps) of the tank with all the liquid tight flexible conduit connections.

Where is the leak? The top of the tank looks rusty, probably from water dripping onto it. Doesn't look like you have pump shaft seal leaks. If you did, there would be water leaking out from the pumps, just below the motors.

This is possibly a Hoffman or Domestic brand unit. Doesn't look like a Shipco. There is a nameplate on the tank's top, in the front right corner. Can't make out what it says though.

If you have steam or hot vapor coming out the vent pipe, this is usually caused by failed steam traps out in the system. When a steam trap fails open, it allows steam into the return lines which vents off to atmosphere at the condensate pump's receiver vent pipe.

Oh God no......that condensate needs to go BACK TO THE STEAM BOILER. with a cast iron boiler (or any boiler besides domestic water) makeup water is the ENEMY.............it will cause boiler failure...........so any of the steam condensate that can make it back to the boiler is less makeup water the boiler has to tolerate. This isn't "waste condensate" like in an air-conditioning system...........the is condensed heating medium (the medium being STEAM....which is the GAS THAT CARRIES THE HEAT TO WHERE IT NEEDS TO GO. you don't want to waste it...........you want to recycle it......back into the boiler to be made into steam again.

The small copper tube coming out of the pump head is to vent air from the seal cavity inside the pump so the seal doesn't run dry in a trapped air bubble. The mechanical shaft seal needs to be in water to be cooled and lubricated.

Once the air is vented, when the pump is running, a tiny bit of water will recirculate through this tube back to the condensate receiver.

If this pump were mounted horizontally, the shaft seal would always be submerged, so the vent line wouldn't be needed.

If this tank is leaking due to a failed seam weld, that's not unheard of with welded steel tanks. I usually see this if the tank is not vented to atmosphere. The receiver tank vent is the only air vent for the whole (2 pipe) system.

When a trap fails open, that steam pressure is now in the returns, and in extreme cases can rupture the tank if it's not vented.

I would say the typical life of a welded steel receiver like this is 10 years. On the other hand, I've seen cast iron tanks last close to a century! You can get cast iron tanks with a 20 year warranty against corrosion failure.

Pump Guy, Thanks for the info on the pump tubes.

Should the float system allow the water level to get to the top of the tank? The rusted hole is now the venting means

Could the existing pipe into the mop be the vent pipe connected higher up to the condensate drain line?
A picture from farther back would be interesting.