Sizing Surge Tank Units with Atmospheric DA (2-Tank)

NOTE: DOES NOT apply to 2-Chamber units! See Sizing Deaerator

Step 1 : Pump Flow Rate Sizing
Enter Load of Deaerator expressed as any of the following units in the drop-down list.	Continuously running pumps
Boiler HP Sq. Feet EDR Lbs./Hour BTUs/Hour MBH Kilowatts (kW)	pump GPM
#1	#2
The result is LESS than 0.5 pump GPM. We advise you contact your Shipco representative. The result is GREATER than 500 pump GPM. We advise you contact your Shipco representative.
Step 2 : Typical Surge Tank Receiver Size
Calculated automatically from results in Step 1.	gross gallons
	#3
Step 3 : Pump Discharge Pressure Sizing
Enter Vertical Lift (if applicable).
feet of head	pump discharge psig
#4	#5
Press "Reset All" to CLEAR ALL calculations and enter new values.

Notes

1. Each pump on a surge tank is sized based on the load of the deaerator being fed.
2. Pumps on the surge tank sized for continuously running operation.
3. Sizing is not applicable for Two-Compartment Design deaerators. The receiver on two-tank surge tank design is typically based on total deaerator load. The size of receiver is expressed in gross gallons, based on the number of gross gallons needed to achieve 10 minutes of NET storage.
4. If deaerator and surge tank are on same floor, enter zero (0) for feet of head. If deaerator is located on a floor above the surge tank, enter the vertical height (in feet) from the pump discharge of the surge tank up to the inlet piping on the deaerator.
5. Assumes pressure drop through modulating valve of 10 psig or less. (Assumes proper discharge pipe size of a velocity 10 ft/sec or less)

Additional Information

If condensate return temperature is 200°F or above (at sea level) check available NPSH to avoid potential cavitation problems.

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