Type .005 DA-STP pressurized deaerators are recommended for high-pressure boiler applications. The standard .005 design removes dissolved oxygen to a maximum level of .005 cubic centimeters per liter of feed water. Unit designed so that undeaerated water only comes in contact with stainless steel to prolong life of unit.
The amount of hot condensate returns influences which design is most appropriate for applications. A single-tank design (DA-STP) is typically used on systems having 80% or more make-up water. A two-tank design (DA-STP-2T) that includes a standalone surge tank is typically used on systems having more than 20% return hot condensate.
Standard deaerator receiver available in black steel and ASME code stamped with an extra corrosion allowance of 1/16" beyond ASME code requirements added. Unit designed with stainless steel trays in external black steel dome that is removable from the receiver; with removable trays in the dome. For two-tank designs, the surge tank can be either plasite-lined or made 300 series stainless steel. Unit can built to handle a wide range of flows and pressures; receiver can be customized in terms of diameter, length and height to meet job specific requirements. Options for stress relieving and radiography testing of receiver available upon request.
Number of pumps on unit depends upon number of boilers to be supported and stand-by specifications. Pump motors can be either 1750 RPM or 3500 RPM, single or three phase. Unit equipped with single stage or multi-stage pumps depending upon operating conditions. Pumps bronze-fitted with industry standard motors and mechanical seals rated for temperatures up to 300°F. Higher temperature seals and special faces available upon request. Pumps can be mounted in either a vertical or horizontal orientation.
A .005 DA-STP deaerator is equipped with direct steam injection assembly with stainless steel preheat tube; assembly includes pressure regulator that is self-contained. Other accessories include but not limited to gauge glass assembly thermometer, inlet strainer, butterfly isolation valve, low-water cut-off or alarm switch, electrical control panels and tank insulation.