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Daniel 3400 Ultrasonic Flow Meter Sizing for Custody Transfer Natural Gas
Quick Answer: Daniel 3400 ultrasonic flow meter sizing for natural gas custody transfer requires actual minimum, normal, and maximum flow rates plus gas composition, pressure, temperature, pipe size, and base conditions. Keep flowing gas velocity between about 1 and 25 m/s at normal operating pressure. Send Silver Automation Instruments your line size in DN, pressure in bar, temperature in °C, and flow range in m3/h for a complete sizing check.
Many engineers skip this part. A Daniel 3400 meter can be ordered in the same nominal size as the pipe, but that does not mean the meter is sized correctly. We have seen customer sites in Southeast Asia where a DN200 meter on a 6-inch gas line spent most of its time below the useful custody transfer velocity range.
Why Custody Transfer Gas Meter Sizing Is Different
Custody transfer measurement is not the same as process gas indication. The Daniel 3400 sits in a billing loop. A measurement error of 0.3 percent on a large gas pipeline can cost one party real money every month. That is why sizing cannot stop at flange size. You have to verify turndown, gas velocity, upstream piping, and flow conditioner location before installation. AGA Report No. 9 and ISO 17089 give performance guidance for gas ultrasonic meters in custody transfer service. The meter body size may be smaller than the pipeline. That reduction is normal when it helps keep the gas velocity high enough for stable acoustic paths.
Sizing Inputs for the Daniel 3400 Meter
The first set of inputs is operating data. We ask for minimum flow, normal flow, and maximum flow at actual conditions. We also ask for operating pressure and temperature at the meter run, gas composition, base pressure, base temperature, and pipe schedule. A gas stream with high CO2 or high nitrogen content will change density and speed of sound. That changes the meter performance calculation. If the normal flow is too close to the minimum, the meter may spend most of its time near the low range where custody transfer accuracy is harder to hold.
For a typical Daniel 3400 installation at 20 bar and 25 °C with DN150 pipe and 800 to 8,000 m3/h, the meter might be sized as DN150 or DN100 depending on velocity. The final choice comes from calculating gas velocity inside the meter bore, not just matching the pipeline. We also check pipe schedule because the inside diameter can change by a few millimetres.
Common Field Sizing Mistakes We See
One common mistake is using the design pressure instead of the actual operating pressure. That makes the calculated velocity look lower than it is. Another mistake is ignoring the flow conditioner location and upstream straight length. A Daniel 3400 ultrasonic meter in custody transfer service normally needs a flow conditioner and sufficient upstream piping to reduce swirl. We have seen a gas distribution customer in Vietnam run a DN300 meter at less than 5 m/s at normal flow. The better fix was a smaller meter body with reducers. That kept the velocity in the sweet spot without changing the pipeline.
So before you quote a natural gas custody transfer project, ask the process engineer for the real operating envelope. Do not use the maximum pipeline capacity only. Do not use the design temperature only. And do not forget to define base conditions for volume flow because 1,000 m3/h at actual conditions is not the same as 1,000 m3/h at standard conditions.
Recommended Sizing Workflow for Daniel 3400
We follow a simple workflow on customer requests. First, collect gas composition and operating p
Signal Outputs and Flow Computer Matching
Custody transfer natural gas measurement usually includes a flow computer. The Daniel 3400 can provide frequency pulse, 4-20 mA HART, and serial data depending on the electronics. The flow computer handles pressure and temperature compensation, compressibility calculation, and volume conversion to base conditions. When you size the meter, also check the pulse output frequency at maximum flow. Some flow computer inputs have a maximum frequency. You do not want a pulse output that exceeds the flow computer input limit at peak gas flow.
Regional Installation Notes
In Australia, natural gas custody transfer stations often use a skid with two meters and a bypass. We see similar layouts in Malaysia and Indonesia for pipeline export gas. In the Middle East, customers often ask about high pressure gas at 40 bar to 70 bar and high ambient temperature. That changes speed of sound and density. In Latin America, we see more CNG stations and smaller line sizes for fuel gas. In Africa, diesel-to-gas conversions and gas engine fuel lines are common. Sizing always starts with local operating data. A customer in Oman once asked for a DN150 meter because the pipe was DN150. The actual flow at 50 bar was too low for the meter body. A DN100 with reducers was the correct selection.
Daniel 3400 Custody Transfer Natural Gas Sizing FAQ
Q: What flow range should I send for a Daniel 3400 sizing check?
A: Send minimum flow, normal flow, and maximum flow at actual conditions. Include the flow unit such as m3/h or kg/h. If you only have standard volume flow, also include base pressure and base temperature.
Q: Can the Daniel 3400 meter body be smaller than the process pipe?
A: Yes. It is common to use reducers. A smaller meter body raises gas velocity at low flow and can improve turndown. The piping reduction must be accounted for in the installation drawing.
Q: Which gas composition details do you need?
A: Provide methane, ethane, propane, nitrogen, CO2, and any heavy hydrocarbon share. Water content and hydrogen sulfide also matter if present. The gas composition affects density and speed of sound.
Q: What signal outputs do I need for custody transfer?
A: Frequency pulse is often used for flow computer totalization. 4-20 mA HART can go to SCADA. Serial data such as Modbus is useful for diagnostics. Specify your flow computer make and input limits.
Q: Why does the Daniel 3400 sizing result depend on pressure?
A: Natural gas volume flow at actual conditions changes with pressure. A higher pressure at the same pipe size gives lower actual velocity for the same standard volume flow. That affects turndown and meter path performance.
Need a sizing check? Send Silver Automation Instruments your gas composition, pressure in bar, temperature in °C, pipe size in DN, and minimum to maximum flow in m3/h. We can confirm the correct Daniel 3400 meter body and upstream piping requirement. Tel: +86-135-1213-1526. Whatsapp: 86-135-12131526. WeChat: +86 13512131526.
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