Krohne Optisonic 3400 Flow Meter Sizing: Three-Beam Inline Acoustic Custody Transfer Systems

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Krohne Optisonic 3400 Flow Meter Sizing for Three-Beam Inline Acoustic Custody Transfer Systems

Quick Answer: Sizing a Krohne Optisonic 3400 three-beam inline acoustic custody transfer meter starts with line size, pressure class, temperature, and flow range. The DN size must keep normal flow velocity between 0.5 and 10 m/s. Send your pressure (bar), temperature (°C), pipe size (DN), and flow range to Silver Instruments for a cross-checked quotation.

Most engineers skip one simple step when they size an inline ultrasonic custody transfer meter. They take the existing pipe size and assume the meter body matches. That assumption works for many water and refined product lines. But the same rule fails on high viscosity fluids or short straight runs. The Krohne Optisonic 3400 sizing data follows the same rule. Velocity, pressure drop, and acoustic path performance decide the final DN.

What Sizing Data the Three-Beam Inline Acoustic Custody Transfer System Needs

You need six values before you compare meter sizes. Line size in DN or inches. Maximum and minimum flow rate in m3/h or kg/h. Operating pressure in bar. Operating temperature in Celsius. Fluid type and viscosity in cP. Required accuracy and local approval. For custody transfer, also confirm the pressure class and approval standard. For example, a DN100 line moving 80 m3/h of diesel at 15 bar and 30 degrees C needs a different meter body than a DN80 water line at 6 bar.

DN Selection and Velocity Range

Here is the thing. Pipe size alone never confirms custody transfer performance. For inline three-beam acoustic custody transfer systems, normal velocity should stay between 0.5 and 10 m/s. Below 0.5 m/s the transit time difference becomes small and repeatability drops on some low flow conditions. Above 10 m/s noise and pressure loss go up fast. A DN80 meter handling 40 m3/h runs around 2.2 m/s. A DN50 meter on the same flow runs around 5.6 m/s and may work for a short period. In practice, we recommend DN80 to DN200 for most batching and truck loading skids. DN250 and DN300 fit larger pipeline custody transfer or jetty loading lines.

Pressure and Temperature Rating for Custody Transfer

Process conditions set the flange class and transducer material. Common options are PN16, PN40, PN64, and PN100. ASME 150 to 600 flanges are common in Middle East and Latin America projects. Standard temperature range runs from -20 to 60 degrees C. High temperature versions reach 180 degrees C for hot oil or district energy lines. If your fluid is sea water, check the wetted material first. Titanium or special alloys may be needed for a desalination plant in Saudi Arabia or a marine loading terminal in Panama.

Accuracy and Meter Factor

Custody transfer systems need repeatable volume totals, not just a local display. A three-beam inline acoustic flow meter averages three parallel acoustic paths across the pipe. This gives better swirl correction than a single path clamp-on meter. Typical calibrated accuracy can reach 0.1 to 0.15 percent of measured value on DN80 and larger. For billing applications, the meter factor from a proving skid matters. We have seen this on customer sites many times. A small change in upstream straight run changes the meter factor by more than the basic specification suggests.

Straight Run and Installation

The Krohne

Krohne Optisonic 3400 Flow Meter Sizing: Three-Beam Inline Acoustic Custody Transfer Systems

Optisonic 3400 inline body reduces installation effort because the three acoustic paths are inside a calibrated spool. Even so, you still need good inlet conditions. A general rule is 10D upstream and 5D downstream. A control valve before the meter always causes trouble. So do two elbows in different planes. If the existing pipe has a short straight run, tell us before ordering. Silver Instruments can supply a flow conditioner or a multi-path meter with better swirl tolerance. We have supplied inline ultrasonic flow meters for chemical distributors in Vietnam and crude oil skids in Nigeria where straight run was not ideal.

Why Some Projects Cross-Check Krohne Optisonic 3400 Sizing with Silver Instruments

Some projects specify the Krohne Optisonic 3400 by name. Others need an equivalent inline three-beam acoustic custody transfer system with local service support. We help both. Send us the original data sheet values. We will cross-check DN size, flange rating, flow range, and 4-20 mA HART output. Then we recommend a meter from our inline ultrasonic flow meter range. Our inline ultrasonic flow meters cover DN50 to DN300 with 4-20 mA HART output as standard. We can also supply pressure transmitters and paperless recorders for your custody transfer skid.

Quote Data Needed

For a fast quote, send us this data:

Pressure (bar)

Temperature (°C)

Pipe size (DN)

Minimum and maximum flow rate (m3/h or kg/h)

Fluid name and viscosity (cP)

Power supply and output signal

Classification needs such as ATEX Zone 1 or custody transfer approval

Contact Silver Instruments by Tel: +86-25-68650347, Whatsapp: +86-25-52155837, or WeChat: +86 15365082610.

FAQ

What is the correct velocity range for sizing an inline three-beam acoustic custody transfer flow meter?

Keep normal flow velocity between 0.5 and 10 m/s. Lower velocity can degrade repeatability on some fluids. Higher velocity increases pressure loss and acoustic noise.

Can this type of meter handle sea water or high viscosity fluids?

Yes. Sea water custody transfer works with the right wetted materials such as titanium. High viscosity fluids require a wider flow range check because velocity at low flow may drop below the acoustic path limit.

What data do you need to quote an ultrasonic custody transfer meter?

We need pressure in bar, temperature in Celsius, pipe size in DN, minimum and maximum flow rate, fluid type, viscosity in cP, and the required output signal such as 4-20 mA HART.

Does Silver Instruments supply an exact Krohne Optisonic 3400 replacement?

We do not label our meters as Krohne. We supply inline three-beam acoustic custody transfer flow meters with similar process connections and output options. Send us your existing data sheet and we will check the mechanical and electrical match.

How does a three-beam inline acoustic flow meter improve custody transfer accuracy?

Three parallel acoustic paths measure velocity at different locations across the pipe. The combined result is less sensitive to swirl and non-symmetrical flow than a single acoustic path. That produces stable volume totals and a predictable meter factor.

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