BULLETIN 172 Type .005 DA-ISTP-2THS, .005 DA-STP-2THS, .005 DA-ISTP-2CHS, or .005 DA-STP-2CHS High Temperature Return Units and Deaerating Boiler Feed Pumps
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Pressurized two-compartment or two-tank deaerator units where most if not all of the returns are above the saturation point. Condensate returns are not vented to atmosphere.
HS systems consist of the following types: