Many SAGD facilities will boost the Boiler Feed Water (BFW) alkalinity with caustic to maintain the necessary alkalinity for corrosion protection in Once Through Steam Generators (OTSGs) and to promote rapid oxygen scavenging reactions in the boiler feed water circuit. However, some facilities can facilitate hydroxide addition with recycled boiler blow down into the BFW, thus reducing the necessity of supplemental caustic addition. This operational strategy and the issues will be discussed. This presentation outlines a case study where the management of the recycled boiler blow down resulted in reduction of caustic application, leading to operating chemical cost reductions.

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