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This Concept Map, created with IHMC CmapTools, has information related to: Spraying During Ballast Voyage of an LNG Carrier, to the spray line. START Spray Pump to Subject tank., to allow minimum flow and to cool down the spray header. Once spray header is cooled down : Open isolating valve further., to Subject tank. OPEN Spray discharge valve to allow minimum flow and to cool down the spray header., to subject tank. PARTIALLY OPEN Isolating Valve to the spray line., to vapour header. FULLY OPEN Spray inlet valves to subject tank., for high flow operation. Upon finding it satisfactory; SET Nitrogen supply valve to insulation space header to desired pressure., to insulation space header to desired pressure. SET Nitrogen supply regulating valve at 0.2 kPa., at 0.4 kPa. FULLY OPEN Vapour dome outlet to vapour header., Increase flow rate by adjusting the spray pump discharge. On completion of cool down: Leave spray header valves open to allow the spray line to warm up to ambient temperature., to supply the Engine Room with Boil -off gas for the boilers. SET Forward Mast Riser to the desired pressure., to allow minimum flow and to cool down the spray header. Once spray header is cooled down : Increase flow rate by adjusting the spray pump discharge., at 0.2 kPa. SET Exhaust regulating valve at 0.4 kPa., to the desired pressure. Check Nitrogen System for high flow operation., SPRAYING DURING BALLAST VOYAGE is carred out by the following steps Choose the Subject Tank, Choose the Subject Tank SET LD Compressors on line to supply the Engine Room with Boil -off gas for the boilers.