+-----------------------+--------------+-----------------------------+ | Difficulty Resulting | Nature of | Ordinary Method of | | from Presence of | Difficulty | Overcoming or Relieving | +-----------------------+--------------+-----------------------------+ | Sediment, Mud, etc. | Incrustation | Settling tanks, filtration, | | | | blowing down. | | | | | | Readily Soluble Salts | Incrustation | Blowing down. | | | | | | Bicarbonates of Lime, | Incrustation | Heating feed. Treatment by | | Magnesia, etc. | | addition of lime or of lime | | | | and soda. Barium carbonate. | | | | | | Sulphate of Lime | Incrustation | Treatment by addition of | | | | soda. Barium carbonate. | | | | | | Chloride and Sulphate | Corrosion | Treatment by addition of | | of Magnesium | | carbonate of soda. | | | | | | Acid | Corrosion | Alkali. | | | | | | Dissolved Carbonic | Corrosion | Heating feed. Keeping air | | Acid and Oxygen | | from feed. Addition of | | | | caustic soda or slacked | | | | lime. | | | | | | Grease | Corrosion | Filter. Iron alum as | | | | coagulent. Neutralization | | | | by carbonate of soda. Use | | | | of best hydrocarbon oils. | | | | | | Organic Matter | Corrosion | Filter. Use of coagulent. | | | | | | Organic Matter | Priming | Settling tanks. Filter in | | (Sewage) | | connection with coagulent. | | | | | | Carbonate of Soda in | Priming | Barium carbonate. New feed | | large quantities | | supply. If from treatment, | | | | change. | +-----------------------+--------------+-----------------------------+