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ASME PTC 40 1991 Edition, January 1, 1991
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Flue Gas Desulfurization Units
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The performance of a flue gas desulfurization system (FGDS) is defined to be the characterization of inputs and outputs (see Fig. 1.1). This may include, but is not necessarily limited to, the following:

(a) percent SO2 removal (%R)

(b) Reagent Ratio (RRI or RRR)

(c) energy/power consumption

(d) water consumption and characterization

(e) reagent consumption and characterization

(f) waste/by-product production and characterization

(g) Availability and Reliability. Availability and reliability of the FGDS are not within the scope of this Code.