8 Materials, Corrosion Resistance Tables

Transcription

1 8 Materials, Corrosion Resistance Tables Included among the criteria for meter selection are the materials to be utilized. Of primary interest are those materials which come in contact with the measuring medium. Also the ambient conditions must not be neglected where it is most important that humidity be considered. Generally the user knows his measuring media so well that he can readily indicate suitable materials. The following tables are provided for assistance. The listed information is taken from manufacturers' publications. However, a guarantee for the completeness and correctness cannot be given. The following list includes the available materials for the process-wetted parts in the individual measuring devices. Vortex Flowmeters: Swirl Flowmeters: Meter tube: Sensor: Shedder: Gasket: Meter tube: Sensor: Shedder: Gasket: Graphite,,, Kalrez Graphite,,, Kalrez Electromagnetic Flowmeters: Liner Hard rubber, soft rubber,,, Torlon, Peek,, Ceramic Carbide Electrodes Stainless steel ,,, stainless steel ,,, Iridium Coriolis Mass Flowmeters: Meter tube Stainless steel , , 281

2 Thermal Mass Flowmeters Meter tube Sensor Gasket Stainless steel , Hastelloy Stainless steel , Hastelloy, Ceramic Al 2 O 3 Viton, Kalrez Variable Area Flowmeters: Meter tube,,, stainless steel Float, stainl. steel ,,, Fittings,, O-rings,, Ethylene/ Propylene = The following symbols are used in the resistance tables: + indicates usable material - indicates unsuitable material open fields indicate unknown resistance Even though the tables may indicate that a metal is satisfactory, electromagnetic flowmeters may nevertheless show malfunctions, due to electrochemical reactions in the flowmeter. Liability Note: The following resistance table for ABB flowmeters has been compiled from reference literature and own experience. It is intended to allow for a pre-selection of potentially suited materials for a special application, or for excluding unsuitable materials a priori. However, these specifications are only recommendations for which no liability can be assumed since the corrosion behavior under actual operating conditions may deviate from results obtained in the laboratory with clean measuring media. Reliable specifications require operational corrosion tests or must be based on the user's operational experience. The specifications in the tables refer to laminar corrosion attack. The risk of local corrosion attack (pitting corrosion, stress corrosion cracking) has not been taken into account. 282

3 Non- Acetic acid F Acetic acid F Acetic anhydride F Acetylene G Alum. chloride solution F Alum. chloride solution F Alum. sulfate solution F Alum. sulfate solution F Ammonia G Ammonia solution F Aniline F Argon G Beer F Benzene F Blood F Brine F Bromine F Butane G Butyl acetate F Butyl alcohol F Butylene G Calcium chloride solution F Calcium hydroxide sol. F Calcium hypochlor. sol. F Caprolactam F Carbolic acid F Carbon dioxide G Carbon tetrachloride F Carbonic acid F Carboxylic acid, diluted F Chlorinated water F Chlorine dioxide, dry G

4 Non- Chlorine, dry G Chlorine, dry F Chlorine, wet G Citric acid F Copper chloride solution F Copper sulfate solution F Copper sulfate solution F Deionized water F Diesel fuel F Ethane G Ethanol F Ethyl acetate F Ethyl alcohol F Ethyl ether F Ethylene G Ethylene chloride F Ethylene glycol F Fatty acid F Ferric chloride solution F Ferric chloride solution F Ferric sulfate solution F Fluorine G Formaldehyde solution F Formic acid F Gasoline F Gelantine F Glycerine F Glycol F Heating oil F Helium G Heptane F

5 Non- Hexane F Hydrazine solution F Hydrobromic acid F Hydrochloric acid F Hydrochloric acid F Hydrocyanic acid F Hydrofluoric acid F Hydrofluoric acid F Hydrogen G Hydrogen chloride G Hydrogen peroxide sol. F Hydrogen sulfide, dry G Kerosine F Krypton G Magnesium chloride s. F Magnesium sulfate sol. F Malic acid F Methane G Methanol = Methyl alc. F Methylbenzene = Toluol F Methylene chloride G Monochloroacetic acid F Natural gas, dry G Neon G Nitric acid F Nitric acid F Nitrogen G Oleum F Oleum F Olive oil F Oxalic acid solution F

6 Non- Oxygen G Ozone G Perchloroethylene F Petroleum F Phenol F Phosgene F Phosphoric acid F Phosphoric acid F Photographic emulsion F Phthalic anhydride F Potassium chloride sol. F Potassium hydroxide sol. F Potassium permang. sol. F Potassium sulfate sol. F Propane G Sea water F Sodium bicarbonate s. F Sodium bisulfate solut. F Sodium bisulfate solut. F Sodium carbonate sol. F Sodium chloride sol. F Sodium chloride sol. F Sodium hydroxide sol. F Sodium hydroxide sol. F Sodium hypochloride s. F Sodium nitrate solution F Sodium silicate solution F Sodium sulfate solution F Sodium vanadate sol. F Spinning bath F Sulfur dioxide, dry G Sulfuric acid F Sulfuric acid F

7 Non- Sulfuric acid F Sulfurous acid F Tannic acid F Tartaric acid F Toluene F Trichlorethylene F Tricresylphosphate F Urea F Vinyl acetate F Vinyl chloride F Wort F Xylene F Yeast F