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Coriolis Flow Meter Pressure Ratings and Material Selection Guide
Quick Answer: Pressure rating and wetted material choice decide if your Coriolis flow meter survives the process. Start with the maximum operating pressure in bar, add a safety margin of at least 20 percent, then select the next higher pressure class. Match wetted parts such as 316L stainless steel, Hastelloy C22, or tantalum to the exact fluid chemistry and temperature.
Many engineers open the Emerson Coriolis flow meter datasheet library and jump straight to accuracy and turndown. That is a mistake. The pressure rating table and material selection section matter more for long term reliability. Silver Instruments supplies industrial Coriolis mass flow meters for oil and gas, chemical, food and beverage, marine, and water treatment plants across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
What Pressure Ratings in a Coriolis Datasheet Actually Mean
A pressure rating like PN40 or ANSI 300 is the maximum allowable pressure at a reference temperature, usually 20°C. As process temperature rises, the metal body weakens and the safe working pressure drops. A meter rated PN100 at 20°C may only handle 78 bar at 150°C. Check the temperature derating curve in the Emerson datasheet before you choose a model. For example, if your pump deadheads at 55 bar, do not specify PN40. You need PN100 or ANSI 300. Most industrial users we serve need DN15 to DN150 meters with pressure ratings from PN16 up to PN100. High pressure oil and gas jobs sometimes need ANSI 600 or 900 flanges.
Wetted Material Selection for Coriolis Meters
Wetted material selection is about chemical compatibility, not just corrosion resistance. The Emerson Coriolis datasheet library lists several options. 316L stainless steel works for water, dairy, light chemicals, and many food products. Hastelloy C22 or C276 handle acids and chlorides. Tantalum suits strong acids like hydrochloric acid. Titanium serves seawater and brine lines. The measuring tube material matters more than the flange material because the tubes are thin and carry the process fluid. We saw a paint manufacturer in Vietnam specify 316L for a solvent blend that contained trace chlorides. Six months later the tubes developed pitting. A switch to Hastelloy C22 solved the problem. This detail rarely shows up on a process data sheet.
Temperature Derating: What Engineers Often Miss
Temperature changes two things at once. It reduces the pressure rating of the meter body and changes the material strength. Standard Coriolis meters from Silver Instruments handle process temperatures from -50°C to 150°C. High temperature versions extend to 200°C or 250°C with reduced pressure limits. For steam or hot oil, do not guess. Give us your maximum continuous temperature and the peak temperature during cleaning or CIP cycles. Food plants often run CIP at 135°C. The meter must survive that, not just normal production temperature. Because fluid density changes with temperature, mass flow measurement stays reliable. We recommend remote transmitter mounting for a
Matching Pressure Class and Material to Your Industry
Oil and gas terminals in the Middle East and Africa often ask for high pressure Coriolis meters with ANSI 600 flanges and 316L or duplex stainless steel bodies. Chemical plants in Southeast Asia lean toward Hastelloy C22 for acid dosing and solvent transfer. Food and beverage producers in Australia and New Zealand commonly use 316L with Tri-Clamp connections and CIP tolerant designs. Water and wastewater plants in Latin America select PN16 or PN40 meters for chemical dosing lines. We do not sell one material for all jobs. The right combination comes from four data points: fluid name, concentration, temperature, and maximum pressure. Send us those four points and we can suggest a Coriolis meter configuration from our standard range. If your process matches a known Emerson model series, we can offer a compatible alternative with similar pressure and material options.
Silver Instruments Coriolis Flow Meter Options
Our Coriolis mass flow meters cover DN3 to DN200. Pressure ratings include PN16, PN40, PN63, PN100, and ANSI 150, 300, and 600. Wetted materials include 316L stainless steel, Hastelloy C22, Hastelloy C276, titanium, and tantalum. Process connections include flanges, Tri-Clamp, and threaded options. Outputs include 4-20 mA HART, pulse, and Modbus RTU. Accuracy is typically 0.1 percent of rate for liquids and 0.5 percent for gas. These meters are designed for continuous industrial use, not laboratory testing.
For a fast quote, send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h. Reach Silver Automation Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610.
FAQ: Five Key Questions on Pressure and Material Selection
What pressure rating do I need for a Coriolis flow meter? Take your maximum operating pressure in bar and add at least a 20 percent safety margin. Then select the next higher PN or ANSI class. For example, 55 bar operating pressure needs PN100 or ANSI 300, not PN40.
Which wetted material is best for seawater? Titanium or Hastelloy C276 works well for seawater and brine. 316L can handle seawater for short periods but may pit if chlorides are high and oxygen is present.
Can I use a standard 316L Coriolis meter for hydrochloric acid? No. Hydrochloric acid will attack 316L. Use tantalum or Hastelloy C22 depending on concentration and temperature. Send us the acid concentration and temperature before you order.
Do Coriolis meters have temperature limits? Yes. Standard models handle -50°C to 150°C. High temperature versions extend up to 200°C or 250°C with reduced pressure. Check the derating curve in the datasheet.
What is the typical delivery time for a Coriolis meter with Hastelloy tubes? Most Hastelloy C22 and C276 meters ship within 3 to 4 weeks. Tantalum tube meters may take 5 to 6 weeks because the material is expensive and less common.
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