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Daniel Gas Flow Meter: High Volume Pipeline Metering Loop Design
Quick Answer
Silver Instruments supplies gas flow meters and loop components for high volume pipeline metering loops from DN150 to DN900. A Daniel gas flow meter replacement usually needs a primary flow element, pressure and temperature transmitters, and a flow computer. Send your pipe size, gas type, pressure, temperature, and flow range. We reply with a meter model, a loop diagram, and a price.
What a High Volume Pipeline Metering Loop Includes
A metering loop is a short pipe section with a flow element, straight upstream and downstream lengths, pressure taps, a temperature sensor, and a flow computer. The loop measures gas flow at actual conditions and converts it to standard volume or mass flow. In gas lines from 6 inch to 36 inch, the loop design decides whether the system holds 0.5 percent accuracy or drifts beyond 2 percent.
Where Daniel Gas Flow Meter Loops Are Used
We see Daniel gas flow meter loops in natural gas custody transfer, city gate stations, gas turbine fuel lines, biogas upgrading plants, and compressor discharge lines. These sites often operate at 20 to 100 bar and 20,000 to 600,000 Nm3/h. A customer in Indonesia asked us to inspect a 12 inch natural gas line at 40 bar and 80,000 Nm3/h. The existing Daniel orifice meter had lost accuracy after wet gas service.
Loop Design Details That Matter
Start with the meter run. The upstream and downstream pipe must match the meter body schedule and inside diameter. For an orifice plate, ISO 5167 asks for long straight runs. In practice, many stations do not have space. A flow conditioner can reduce upstream straight run from 20D to 5D. Most engineers skip this part when a meter underreads at low flow. We have seen this on many customer sites.
Temperature and pressure compensation are the next weak points. A PT100 transmitter and a 4-20 mA HART pressure transmitter must sit in the correct tap locations. If the pressure tap is too close to the orifice plate or blocked by sludge, the flow computer calculates the wrong density and the loop shifts by 1 to 2 percent.
Meter Options for High Volume Gas Pipelines
Silver Instruments offers three setups. The first is an orifice plate system with a differential pressure transmitter. This suits dry natural gas and compressed air from DN100 to DN900. The second is an inline ultrasonic gas flow meter. This suits natural gas, biogas, and oxygen from DN150 to DN600 with turndown up to 1:30. The third is an insertion thermal mass flow meter for flare lines and risers from DN80 to DN300.
For a Daniel gas flow meter replacement, inline ultrasonic is often the fastest option. It fits between the same flanges when the meter run has enough straight le
A Real Replacement Example in Vietnam
Last year a gas distribution customer in Vietnam asked us to quote a replacement for a 10 inch Daniel gas flow meter on a natural gas line at 25 bar and 45,000 Nm3/h. The customer wanted to keep the existing straight run and panel wiring. We supplied an inline ultrasonic gas flow meter, a PT100 temperature transmitter, a pressure transmitter with HART, and a flow computer with AGA 8. Installation took two days. The meter passed the site acceptance test at 0.5 percent deviation.
Five Frequently Asked Questions
Question: Can you replace a Daniel gas flow meter without changing the piping?
In many cases yes. We need the existing flange size, flange rating, meter run length, and straight run. We can match flange face and body length for many inline ultrasonic and orifice systems.
Question: What data do you need for a loop quote?
Send gas type, flow range in Nm3/h or kg/h, pressure in bar, temperature in Celsius, pipe size in DN, flange rating, and area classification such as ATEX Zone 1. We will select the meter, flow computer, and wiring.
Question: What accuracy can a high volume gas loop achieve?
Inline ultrasonic can reach 0.5 percent of reading under stable flow. An orifice loop typically holds 1.0 to 1.5 percent across a narrower turndown. The pressure transmitter and flow computer set the final system accuracy.
Question: Which gas types can the loop handle?
Natural gas, compressed air, nitrogen, oxygen, biogas, flare gas, and process gas. We keep wetted materials in 316L stainless steel or Hastelloy for corrosive and wet gas streams.
Question: Do you ship to Southeast Asia, Australia, Latin America, Africa, and the Middle East?
Yes. We export to Indonesia, Vietnam, Thailand, Malaysia, Philippines, Australia, New Zealand, Saudi Arabia, UAE, Nigeria, Chile, Peru, and Mexico. We include a test report and calibration certificate with each meter.
Get a Quote for Your Metering Loop
Send your pressure in bar, temperature in Celsius, pipe size in DN, gas type, flow range, and flange rating. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. Our engineers will reply with a recommended meter, loop drawing, and price. You can also visit flow-meter.com.au for the product range.