Size Surge Tank

This calculator is ONLY for the separate surge tank as part of a two-tank (2T) system.
Before you begin!
If condensate return temperature is 200°F or above (at sea level) check available NPSH to avoid potential cavitation problems.

Deaerator Design



Pump Flow Rate

Each pump on a surge tank is sized based on the load of the deaerator being fed. Pumps on the surge tank are sized for continuously running operation.

Pump Flow Rate for Pumps Running Continuously 2
0 gallons ⁄ min (GPM)

Typical Surge Tank Receiver Sizing

Typical Surge Tank Receiver Size is determined from Pump Flow Rate. Sizing is not applicable for Two-Compartment Design deaerators. The receiver on a two-tank surge tank design is typically based on total deaerator load. The size of the receiver is expressed in gross gallons; based on the number of gross gallons needed to achieve 10 minutes of NET storage.

Typical Surge Tank Receiver Size 3
0 gross gallons

Pump Discharge Pressure

Assumes pressure drop through modulating valve of 10 psig or less. Assumes proper discharge pipe size of a velocity 10 ft/sec or less.

If deaerator and surge tank are on same floor, enter "0" (zero) 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.

feet (of head)
Pump Discharge Pressure 5
0 psig
  • Each pump on a surge tank is sized based on the load of the deaerator being fed.
  • Pumps on the surge tank sized for continuously running operation.
  • 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.
  • 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.
  • Assumes pressure drop through modulating valve of 10 psig or less. (Assumes proper discharge pipe size of a velocity 10 ft/sec or less).
  • Pump gallons/min (gpm) is < 0.5.

    Contacting your Shipco® representative is advised.
  • Pump gallons/min (gpm) is > 500.

    Contacting your Shipco® representative is advised.