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Coriolis Flow Meter Installation Orientation: Preventing Slurry Trap Pipe Settling
Quick Answer: For slurry, sludge, mining tailings, food pulp, or any fluid with solids, install the Coriolis flow meter in a vertical pipe section with flow moving upward. This keeps particles suspended and stops sludge from settling inside the sensor tubes during shutdown or low flow. If vertical mounting is not possible, use horizontal mounting only when the tubes remain full and velocity stays above the settling limit.
Silver Automation Instruments fields many questions from water and wastewater plants, mining sites, and food processors about Coriolis flow meter installation orientation. The biggest mistake is not electrical. It is mechanical. A slurry flow meter installed with its tubes in a low spot or flat pipe can turn into a settling basin. Once solids pack inside the tube, measurement drifts, pressure drop rises, and cleaning becomes a shutdown job. This orientation decision is the starting point for preventing slurry trap pipe settling.
We have seen this on customer sites many times. A mineral processing plant in Western Australia had a DN50 Coriolis meter mounted horizontally in a long tailings line. The pump was 80 meters away. During batch stops, fine solids fell out of suspension and compacted in the U shaped tubes. When the line restarted, the meter read 6 percent high for the first 20 minutes because the tube stiffness changed.
Start with Vertical Upward Flow
Vertical upward flow is the safest orientation for slurry and dirty services. Gravity works with the flow direction. Solids cannot easily fall down and collect in the sensor tubes when the process is running. During a zero flow or shutdown condition, the remaining particles tend to drop back down the vertical pipe away from the meter body. This reduces the chance of a hard plug inside the measuring tubes.
For most installations, mount the meter in a vertical pipe run with flow from bottom to top. The pipe should be supported on both sides of the meter. Do not allow the meter to work as a pipe support. At nominal flow, keep velocity in the range recommended by the manufacturer. For abrasive slurry, a minimum velocity of 1.5 to 3.0 m/s is typical depending on particle size and density.
Horizontal Mounting Rules for Slurry and Dirty Fluids
Many plants cannot add a vertical section because of headroom or existing pipe racks. Horizontal mounting is possible but only with strict rules.
First, the measuring tubes must stay completely full at all times, including startup and shutdown. For a bent tube Coriolis meter, the sensor tubes are often U shaped. In horizontal position, the tube bend should point downward for liquids with solids if the vendor permits that orientation. This creates a self draining path. If the bend points upward, solids can collect at the bottom of the loop. That is the slurry trap condition many operators find after a weekend shutdown.
Second, locate the meter on the discharge side of pumps or after a vertical riser where solids stay suspended. Avoid placing a horizontal Coriolis meter just before a downward pipe drop. The low point may become a settling pocket.
Third, use a bypass or drain valve around the meter for flushing. In mining slurry, caustic slurry, or starch lines, operators need a clean water flush after batch stops. A drain port near the meter makes flushing faster. Without a flush connection, the meter may need removal every time particles settle.
Where to Place the Meter in the Pipe Run
Do not install a slurry Coriolis meter at the lowest point of a pipe system. That is inviting pipe settling. The meter body becomes a trap during static periods. Place it in a continuously rising line or just downstream of a discharge elbow where flow turbulence is high enough to keep particles moving.
Avoid long horizontal dead legs upstream of the meter. For example, a dairy plant in New Zealand had a waste whey line with a DN25 meter installed after a 30 meter horizontal run. The line was flushed with water only once per day. Yeast and protein solids settled inside the meter during the night. The morning batch always started with density errors. After the plant moved the meter to a vertical riser after the positive displacement pump, the problem stoppe
Recommended Silver Instruments Coriolis Models
Silver Automation Instruments supplies Coriolis mass flow meters for slurry, high viscosity, and solids-bearing process fluids. For general slurry service, the standard meter line covers DN15 to DN150. The dual bent tube design suits flow ranges from 0 to 1000 kg/h for smaller line sizes and up to 300,000 kg/h for larger pipes. Wetted parts can be specified in 316L stainless steel, Hastelloy, or other alloys depending on corrosion and abrasion conditions. High viscosity up to 500,000 cP can be handled depending on tube design.
The transmitter gives 4 to 20 mA HART with mass flow, density, and temperature outputs. That helps slurry lines because a density shift is often an early warning of solids settling inside the tube. Intrinsically safe options are available for ATEX Zone 1 and Zone 2.
For abrasive mining slurry or ceramic slip, we often recommend the larger tube design with a hard wetted surface option. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h or m3/h. We will recommend a meter orientation and a model that fits the pipe layout. The process data matters more than the model number.
Site Example: A Slurry Line in Indonesia
Last year a customer in Indonesia asked us about a DN80 Coriolis flow meter for clay slurry. The original meter was mounted horizontally in a long drain line. After two months, the sensor tubes packed with clay and the zero point shifted. The plant replaced the meter and changed the pipe spool to a vertical section with upward flow. The replacement meter from Silver Automation Instruments was installed on the vertical riser after a progressive cavity pump. The line runs at 2.1 m/s during normal transfer. Since the change, the meter has held its zero and the plant does not open the meter for manual cleaning.
What About Zero Flow and Shutdown
Slurry systems do not always run continuously. Batch operation is common in food, mining, and wastewater plants. During shutdown, solids will settle if the fluid is not moving. That is why the installation orientation must leave a path for solids to fall away from the sensor tubes. Vertical upward flow naturally drains the tube on shutdown. Horizontal mounting with the tube bend downward also helps. But even the best orientation needs a flush plan for sticky or fast settling slurries.
FAQ
Can a Coriolis flow meter handle slurry with large particles
Yes, but the particle size must be smaller than the sensor tube internal diameter. For particles above 3 mm or high solids loading, confirm the application with the supplier. We ask for particle size, solids percentage, density, viscosity in cP, and pipe size before recommending a meter.
Is vertical upward flow mandatory for slurry
No, but it is the strongest method to prevent slurry trap pipe settling. Horizontal installation can work if tubes stay full and velocity remains high. Vertical downward flow is not recommended because air pockets and falling solids create unstable signals.
What is the minimum pipe velocity for slurry in a Coriolis meter
It depends on the slurry. For fine particles, keep velocity above 1.5 m/s. For coarse or heavy particles, use 2.5 to 3.5 m/s. The customer should provide particle size distribution and specific gravity so Silver Instruments can verify the meter pressure drop and orientation.
How do I clean a Coriolis meter after slurry service
Install isolation valves and a flush port. Use clean water or a compatible solvent to flush after each batch. Do not use compressed air into a hot sensor without checking the vendor limits. The flush velocity should be at least the normal process velocity to carry settled material out.
What data should I send for a slurry Coriolis flow meter quote
Send us the pipe size DN, flow range in kg/h or m3/h, process pressure in bar, temperature in °C, solids content in percent, particle size, and the available straight run. We will check the orientation and quote a meter that matches your pipe spool.
Contact Silver Automation Instruments: Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, WeChat: +86 13512131526. You can also search for Silver Automation Instruments flow meter manufacturer for more application notes.