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Mass Flow Meter Liquid: Coriolis Processing Instrumentation Sizing
Quick Answer: Sizing a Coriolis mass flow meter for any liquid starts with your flow range in kg/h, process pressure in bar, fluid temperature in °C, and viscosity in cP. Many engineers skip the pressure drop calculation and then face measurement errors from entrained gas or flashing. Silver Automation Instruments supplies direct-mass Coriolis meters from DN3 to DN150 with 4-20 mA HART, pulse, and RS485. Tell us your pressure (bar), temperature (°C), pipe size (DN), and flow range, and we will return a sizing report and price.
Why Direct Mass Measurement Stops Rework on Liquid Lines
Volumetric meters force you to compensate for density changes yourself. A Coriolis meter measures mass flow and density together, with one device and straight pipe. That means kg/h stays kg/h regardless of whether your fluid heats up from 25 °C to 80 °C or slightly changes composition. A paint manufacturer in Vietnam found this the hard way. They used a turbine meter on a solvent-based coating line. Every time the batch temperature drifted, the volume reading drifted with it, and the mix ratio was off. After switching to a Silver Instruments Coriolis meter in DN25, the dosing loop became repeatable within ±0.1% of rate. No more rework on 2-ton batches.
The 4 Parameters That Actually Determine Coriolis Sizing
Most sizing conversations get stuck on pipe diameter alone, but Coriolis sizing is about mass flow rate first. Here is the checklist we use with customers in the Middle East, Southeast Asia, and Latin America.
Nominal flow rate (kg/h or t/h). Give us the normal and maximum flow your process needs, not just the pipe DN. For a diesel transfer line from a storage tank in Kenya, the customer originally asked for DN80 based on pipe size. After we checked the pump data, the maximum flow was only 14 000 kg/h. A DN50 Coriolis meter handled it easily and saved over USD 1 200 on the sensor.
Process pressure and temperature. Standard designs work up to 150 °C and 100 bar, but you need to tell us the real numbers. For high-temperature glucose syrup at a Malaysian food plant running at 135 °C and 6 bar, we specified a secondary containment sensor body. No cooling jacket was needed.
Fluid viscosity and entrained gas. High viscosity above 100 cP shifts the sizing because pressure drop goes up fast. Entrained gas is even more critical. A wastewater sludge line in a Chilean plant had about 2% air by volume. We selected a Coriolis meter with entrained gas handling firmware, and the reading stayed stable instead of dropping to zero like their old magnetic flow meter.
Wetted material compatibility. For seawater in a desalination plant in Oman, we used Super Duplex stainless steel. For nitric acid at a Colombian fertilizer site, we went with Hastelloy C-22. The wrong material selection can ruin a sensor in weeks. We keep the material certificates and test reports on file for every build.
Send us your pressure (bar), temperature (°C), pipe size (DN), and the normal and maximum flow. We will select the sensor, transmitter, and process connection for you. Email [email protected] or message our engineers on WhatsApp at 86-135-12131526.
Pressure Drop Is the Hidden Sizing Limit
Coriolis tubes are restrictive by design because they rely on tube oscillation. If you ignore pressure drop, you risk undersi
Turndown Ratio and Low Flow Cutoff: What Works in Practice
Data sheets may claim 20:1 turndown, but the usable range depends on your accuracy requirement and fluid noise. For custody transfer of methanol in a Brazilian terminal, we calibrate the meter across the billing range only, and the low flow cutoff is set aggressively at 0.5% of maximum flow. But in a batch blending application for flavour additives at an Australian food plant, the plant engineer needed accurate dosing down to 2 kg/h on a DN10 meter. We achieved that by lowering the cutoff to 0.1% and confirming zero stability at site.
Field Experience That Shapes Our Sizing Advice
Here is the thing: most Coriolis sizing errors we see on customer sites come from two sources. First, the spec was handed off by someone who copied the line size without checking the actual flow. Second, process conditions changed after commissioning, but the meter was never resized. Last year a water treatment plant in Mexico asked us to replace a DN80 Coriolis from another brand. The plant had dropped flow by 40% after a process redesign, and the meter spent 70% of its time below 5% of the original range. We installed a DN50 Silver Instruments meter, and the dosing accuracy for their polymer addition improved immediately. Total installed cost went down too.
FAQ: Coriolis Mass Flow Meter Liquid Sizing
Do I need to know density to size a Coriolis meter? No. The sensor measures density directly and sends it to the transmitter. You only need flow rate, pressure, temperature, and pipe connection size to start the selection.
Can one Coriolis meter handle two liquids with different viscosities? Yes, if you give us the worst-case combination. A batch reactor in Egypt handled water-like solvent at 1 cP and heavy resin at 450 cP through the same DN40 meter. The meter handled both, but we sized for the high-viscosity case to keep pressure drop within limits.
What pipe length do I need upstream? Coriolis meters generally need no straight run, but if you have a severe swirl from two elbows in different planes, 3D of straight pipe before the meter helps. For most installations we use zero straight pipe and still get 0.1% accuracy.
Is a secondary containment housing mandatory? Only if your fluid is hazardous or if a tube rupture could create a safety risk. For standard water, chemicals, or food products, the standard single-tube or dual-tube design works fine. For ammonia or LPG, we always add the secondary barrier.
How fast can we get a quote with sizing confirmation? After you send us your pressure (bar), temperature (°C), pipe size (DN), and flow range to [email protected], we typically return a preliminary sizing and price within 4 hours during Asia business time. You can also reach us by phone at +86-135-1213-1526 or WeChat at +86 13512131526 for live technical support.
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