Selection of hypochlorous gas transmitters
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For blast furnace gas with a temperature of 150°C and a pressure of 9 kPaG, where the chloride ion concentration in the gas is 22 mg/Nm³ and the concentration in the condensed water is 6600 ppm, what material should be used for the liquid-contacting part of the pressure transmitter? What material should be chosen for the pressure tap tube? I heard that chloride ions are particularly likely to corrode stainless steel.
Simply select a regular material and add an isolation tank. Diaphragms made of special materials are more expensive; to resist chloride ions, titanium or Hastelloy may be required.
1. The thickness of the diaphragm is expressed in terms of how many 0.01mm units there are; therefore, for corrosion resistance, it’s not enough to rely solely on the hardness of the diaphragm. No diaphragm can withstand such conditions for more than a year. . . 2. Theoretically, those with good resistance to chlorine corrosion are tantalum diaphragms, titanium diaphragms, and Hastelloy diaphragms; however, due to their high stiffness and low toughness, using them to manufacture sensors for measuring pressures of 9 kPa presents significant challenges in terms of process complexity in order to ensure optimal performance. 3. There are specialized areas of expertise; in terms of corrosion prevention, some issues can be resolved by using pressure application techniques, allowing one to achieve much with little effort. How many do you need? Do you want your brother to teach you the art of selling? :Bro P can basically be considered a master of his craft. Aren’t the brothers saying that! Those who think it’s correct, please post 11111111; those who think it’s incorrect, please post 000
The material of the equipment determines the material of the pressure guiding pipes; chloride ions cause pitting corrosion in stainless steel. Therefore, the idea mentioned on the second floor of using an isolation tank and adding an isolation fluid is also a good approach. Actually, I have a question: do you plan to use a flanged transmitter or a pressure tap + transmitter? If it’s a flange type, there’s not much to consider. But in the case of pressure transfer pipes, the material used for the transmitter’s contact parts can only be stainless steel; many manufacturers won’t go to the trouble of creating custom components for such instruments, and the cost of custom fabrication would be relatively high.