DTCS Series Double-Wall Steam Tank Heaters

Steam Recovery Rate With a Second Barrier

The DTCS combines two things that would otherwise pull against each other: the recovery rate of a steam-heated bundle and the containment of double-wall construction. It exists because potable storage tanks frequently need both.

Steam gives the recovery rate. Condensing steam delivers latent heat at a rate no practical hot water supply matches, which is what brings a large storage tank back to temperature quickly after a heavy draw.

The double wall gives the separation. Boiler steam carries treatment chemicals and is not potable. Inside a potable storage tank, a single tube wall between the two is exactly what double-wall requirements exist to prevent, and the vented path between the walls routes any leak outside the tank.

Surface temperature deserves attention. Steam produces a high tube surface temperature, and in a potable tank that promotes scaling on hard water. Lower steam pressure reduces the surface temperature and slows scaling, generally more effectively than adding surface does.

Condensate drainage remains critical. A flooded bundle loses surface progressively and the symptom presents as a tank that will not recover. Check the trap and drainage before assuming the bundle has failed.