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Emerson Daniel Ultrasonic Flow Meter for Gas Custody Transfer: Precision Sizing Guide
Quick Answer: Size a gas custody transfer ultrasonic meter for 1 to 30 m/s actual gas velocity. Send pressure, temperature, gas composition, pipe inner diameter and flow range. An Emerson Daniel meter usually needs a 4 path or higher chordal design and AGA9 or ISO 17089 compliance. Silver Instruments can quote a gas ultrasonic flow meter alternative when you send your pressure (bar), temperature (°C), pipe size (DN), and flow range.
Why Precision Sizing Matters
Gas custody transfer is a billing point. A 0.5 percent error at 10 million standard cubic meters per month is real money. Many gas utilities in Southeast Asia and the Middle East run low night flows and peak morning loads. A meter sized only for peak flow can lose accuracy at 20 percent of range. In practice, check both minimum and maximum gas velocity. Too low velocity creates poor signal to noise. Too high velocity creates pressure drop and pipe noise.
We saw a pipeline in Vietnam with a 150 mm meter on a 250 mm pipe. The meter read 2 m/s at minimum flow and the diagnostic signal was unstable. After resizing to 100 mm with a reducer, the meter reached 5 m/s and the reading stabilized.
Parameters You Need Before Selecting a Meter
Send pipe size DN, minimum and maximum flow rate, operating pressure bar, operating temperature Celsius, gas composition and available straight run. For natural gas custody transfer, use actual flowing conditions. Standard or normal conditions hide real velocity. The same Nm3/h at 4 bar and 40 bar gives very different actual m3/h and gas velocity.
Gas composition matters because it changes the speed of sound. Natural gas with 8 percent carbon dioxide has a different speed of sound than pure methane. Daniel meters compare measured and calculated speed of sound. If the gas composition is wrong in the flow computer, the meter may flag a velocity profile error.
Recommended Sizing Targets
Keep minimum gas velocity above 1 m/s for a 0.5 percent uncertainty class. Better range is 3 to 25 m/s. Maximum velocity below 30 m/s for custody transfer. Pipe diameter is a direct lever. If a DN150 meter sees 1.8 m/s at minimum flow, a DN100 meter with reducers can reach 4 m/s. But do not create excessive pressure drop. For gas below 2 bar, keep pressure drop below 20 mbar if possible.
For a typical natural gas line at 20 bar, 20 Celsius, DN150, a flow range from 300 to 9000 Nm3/h gives roughly 3 to 24 m/s. This fits a 4 path custody transfer meter well. At 40 bar, the same DN150 can handle higher Nm3/h but velocity stays within limits due to gas density.
Accuracy Class, Path Count and Diagnostics
Most custody transfer standards accept 4 path and 8 path ultrasonic meters. A 4 path meter balances cost and performance. An 8 path meter is common above DN400 or when flow profile disturbance is high. Path count is not a substitute for straight run.
For AGA9 or ISO 17089 compliance, check meter body, transducer design, flow computer and calibration certificate. Ask for accredited high pressure gas calibration from a facility such as Pigsar in Germany or Westerbork in the Netherlands. Some suppliers only provide dry calibration or dimensional checks.
Diagnostics are part of precision sizing. Gain, signal to noise, speed of sound, turbulence and velocity profile should be readable from the meter software. We saw a gas plant in Nigeria run a meter with blocked transducer ports for months because the diagnostics alarm was ignored
Emerson Daniel Alternatives from Silver Instruments
Emerson Daniel is well known for gas ultrasonic custody transfer meters in LNG, gas transmission and petrochemical plants. Lead times and regional service can be a problem for smaller operators in Southeast Asia, Africa and Latin America.
Silver Instruments supplies gas ultrasonic flow meters for custody transfer and process gas. A typical meter uses a 4 path chordal design, stainless steel or carbon steel body, and 0.5 percent of reading uncertainty. We can check a Silver Instruments model as a drop in replacement or propose a reduced bore solution. A customer in Thailand needed a replacement for a 6 inch custody transfer meter. We supplied a DN150 4 path meter with flanges, pressure transmitter and a flow computer. The meter passed the local weights and measures acceptance test.
Installation and Straight Run
Use at least 10D upstream and 5D downstream after a single bend. After a control valve or pressure regulator, use 30D or more. If straight run is short, add a flow conditioner. But include its pressure drop in the sizing calculation.
Horizontal installation is common. For wet gas or dirty gas, transducers should not sit at the bottom where liquids collect. Vertical upward flow can help liquid carryover but changes access and support design.
Typical Silver Instruments Gas Ultrasonic Models
The Silver Instruments SUL-G100 is a 4 path inline meter for DN50 to DN300. It suits natural gas, biogas, nitrogen and process gas. The SUL-G200 is a 4 or 8 path meter for DN300 to DN600, used in city gate stations and gas distribution. Both models support 4 to 20 mA HART, Modbus RTU, pulse output and ATEX Zone 1 approval options.
For biogas with high carbon dioxide and saturated gas, we recommend the SUL-G100 with titanium transducers. For dry natural gas city gate service, the SUL-G200 with a flow computer and PT100 temperature sensor is a common package.
How to Request a Complete Sizing Check
Do not just ask for a price. Send pressure bar, temperature Celsius, pipe size DN, flow range in kg/h or Nm3/h, gas composition and available straight run. We will return a sizing sheet with gas velocity, pressure drop, meter body diameter, path count, flange rating and model number.
Contact Silver Automation Instruments at Tel: +86-25-68650347. For WhatsApp, message +86-25-52155837. WeChat users can reach us at +86 15365082610. We respond with technical selection within 24 hours.
FAQ
What is the minimum gas velocity for a custody transfer ultrasonic meter?
Keep minimum gas velocity above 1 m/s for a 0.5 percent class meter. Best range is 3 to 25 m/s under actual conditions.
Can I use an Emerson Daniel meter on a short straight run?
Yes, but add a flow conditioner and check velocity profile diagnostics. For control valve installations, aim for 30D upstream.
Does Silver Instruments calibrate gas ultrasonic meters for custody transfer?
Yes, we arrange high pressure calibration with accredited gas flow facilities and supply calibration certificates.
Which meter model fits a DN150 natural gas line at 20 bar?
For flow from 300 to 9000 Nm3/h, the Silver Instruments SUL-G100 4 path meter is usually a good fit. We confirm after receiving gas composition and pressure data.
How do I get a price and delivery time?
Send pipe size DN, pressure bar, temperature Celsius, flow range and gas composition to Tel or WhatsApp. We reply with model, sizing and price within 24 hours.
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