Stacked Deaerators

What is a stacked deaerator system?

It's a deaerator mounted above the surge tank and piped together in one piece in order to save money, time, and space.

Why consider a stacked deaerator?

In a crowded boiler room where a system has returns, a surge tank is required when there are more than 20% returns. To achieve proper .005 cc/L levels of deaeration, you need to control the swings using constant temperature. Shipco® controls these swings with a modulating level controller on the deaerator and a constantly running transfer pump on the surge tank which is pumping into a transfer/make-up valve between the deaerator and the surge tank. All the make-up water and returns in the system enter the surge tank and mix with the return water. Cold make-up water also mixes with the return condensate reducing the temperature swing upon entering the deaerator. The regulator reaction remains steady with regards to the slight temperature change.

All this considered, a deaerator with a surge tank is necessary, but remembering your boiler room is crowded with limited available space!

Shipco® manufactures a "stacked deaerator" system in addition to typical two-compartment (-2C) and separate two tank (-2T) units. In a stacked deaerator system, the deaerator is mounted above a surge tank, generally cast iron or stainless steel, and is piped together in one piece to save space and reduce installation time. Best of all, a stacked deaerator system still allows controlling all the swings or transients in your system. By controlling all the transients with modulating controls and allowing returns to enter a surge tank with pumps running continuously, temperature and capacity variations are minimized. Quick and sudden changes can also cause air to redissolve very rapidly.

Additionally, the surge tank can be cross connected for redundancy in your system so that when the deaerator is offline for annual inspections or other maintenance, you will have a backup ready to go in its place.