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Kerosene Flow Meter 50 m3/h Airport Hydrant Network Sizing
Quick Answer: For a 50 m3/h kerosene flow in an airport hydrant pit system, the most practical meter is an oval gear flow meter or a Coriolis mass flow meter. Oval gear meters deliver repeatable ±0.2% accuracy at lower cost and need a simple inlet strainer. Coriolis meters provide direct mass measurement, no moving parts in the fuel stream, and native ATEX Zone 1 compliance. Silver Automation Instruments supplies both types with 4-20 mA HART output and full material traceability. Send us your operating pressure (bar), temperature (deg C), pipe size (DN), and flow range for a firm quote.
Why an Airport Hydrant Pit Meter Cannot Be a Generic Flow Meter
A hydrant dispenser pulls kerosene from a pressurized underground network at flow rates that hit 50 m3/h fast. The fuel is clean but the operating rhythm is harsh. Startup and shutdown pressure peaks can ruin a meter not built for this duty. In Manila and Nairobi we replaced generic turbine meters that drifted out of spec after three months. The bearings wore from the low lubricity of Jet A-1. An oval gear meter with PEEK gears and hard-coated rotors solved it.
Temperature in a pit under the apron in the Middle East easily reaches 45 deg C while fuel temperature may be 10 deg C from the tank farm. That thermal shock calls for a meter body with low thermal expansion. We often supply CF8M stainless steel bodies for our OGM series oval gear meters exactly because of this delta. Aluminum bodies are cheaper but engineers in Doha and Jeddah avoid them for hydrant pits.
Sizing a 50 m3/h Kerosene Meter Without Overpressure Drop
833 litres per minute is no small flow. The meter size that handles this while keeping pressure loss under 0.3 bar is typically DN50 or DN65. Too small a meter and you create a restriction that the hydrant cart servo valve has to fight. Too large and you lose low-flow resolution during defueling or slow fill operations. We size for a nominal velocity around 3 to 5 m/s in the meter chamber.
For oval gear meters, a DN50 unit like the Silver OGM-DN50 covers 5 to 60 m3/h with a 12:1 turndown. Pressure drop at 50 m3/h on kerosene (viscosity 1.2 cP at 20 deg C) stays at 0.32 bar. That is well within the JIG recommended maximum of 0.5 bar per component. For Coriolis, a dual-tube DN40 model (CMF040) handles this flow with less than 0.15 bar pressure drop and gives you live density reading as a bonus.
Oval Gear Meter or Coriolis for Hydrant Kerosene
Here is the thing. Both meter families work, but the decision tree splits on total cost of ownership and auxiliary data needs. Oval gear meters have a purchase price typically 40 percent lower than an equivalent Coriolis meter. They need a Y strainer with a 60 mesh screen upstream to catch any pipe scale from the hydrant loop. Maintenance is straightforward, and a local technician can change the rotor pack in under an hour. We have customers in Vietnam running OGM-DN50 meters on hydrant carts that logged over 8 million litres before the first service call.
Coriolis meters, like our CMF series, do not need a strainer. The straight tube or slightly curved tube design has no cavities where dirt collects. They also measure mass flow directly, so you do not need a separate density transmitter or a flow computer converting volume at 15 deg C. In Africa, a major airport authority chose CMF040 meters because they could use the built-in density value to detect fuel batch changes and potential contamination. The ATEX Ex ia IIC T4 Ga transmitter was wired back to a SIL-2 rated PLC via 4-20 mA HART without extra barriers.
Both meter types leave our factory with a 5-point calibration certificate traceable to ISO 17025, using actual Jet A-1 as the test medium when specified. That detail matters to aviation fuel auditors.
Installation and Wiring Details Engineers Skip on the First Order
We have seen this on customer sites many times. The meter arrives, but the straight pipe run is too short or the grounding is wrong. For oval gear meters, 5 DN of straight pipe upstream and 2 DN d
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For Coriolis meters, zero dead leg installation is critical. We ship the CMF meters with factory-installed pigtails so the drain and vent leave no kerosene trap. The transmitter base provides HART device variables of mass flow, density, and temperature all on one twisted pair. Most customers land this on a ProLink RS-485 converter or directly to an RTU.
ATEX and IECEx Compliance for Airport Fuel Pits
Hydrant pit areas are Zone 1 classified spaces. Any meter installed directly in the pit or on the dispenser needs a valid ATEX certificate for gas group IIA (or IIB) and temperature class T4. Silver Automation Instruments supplies OGM oval gear meters with an Ex db IIC T4 Gb explosion-proof enclosure certified by SGS. The Coriolis CMF series comes with Ex ia IIC T4 Ga for the transmitter and Ex d for the sensor junction box. We include the EU-Type Examination Certificate and the associated wiring diagram in every shipment so your inspector has no reason to hold the commissioning.
Frequently Asked Questions on Kerosene Hydrant Meters
Can an ultrasonic flow meter work for kerosene hydrant metering at 50 m3/h?
Clamp-on ultrasonic meters struggle with Jet A-1 kerosene. The sound velocity of kerosene is lower than water and the signal attenuates quickly in thin-wall carbon steel pipe. Inline spool-piece ultrasonic meters exist but the cost often exceeds an oval gear meter. For custody transfer and repeatability, mechanical displacement meters still dominate in aviation fueling.
What accuracy do I need for an airport fuel farm transfer meter?
Fuel into the hydrant loop is a bulk transfer and sometimes a fiscal operation. A common requirement is ±0.2% of reading for line meters. Oval gear meters from Silver Instruments meet this over a 10:1 turndown. For hydrant cart discharge, a sub-meter with ±0.5% is acceptable to IATA guidelines, but most clients standardize on one meter type with ±0.2% fleet-wide.
Do you supply the flow computer and ticket printer too?
We supply the meter and the RTD probe, and we can pre-configure the pulse scaling factor (typically 100 pulses per litre) to match your existing Epsilon or Hectronic flow computer. Silver Automation Instruments also offers a paperless recorder with MODBUS TCP that can serve as a digital fuel ticket register. Ask our engineer to include this when you send the specification.
How often should a kerosene oval gear meter be recalibrated?
In a high-throughput hydrant system, we recommend an annual master meter check on site. A portable master meter on a trailer is common practice at large airports in the Middle East. The rotor chamber wear depends on fuel cleanliness. With proper 60 mesh filtration, the meter holds its calibration for over 12 months. Our service team in Kuala Lumpur can ship a replacement rotor kit in 48 hours if needed.
What information do you need for a quotation on a 50 m3/h hydrant kerosene meter?
Send us the minimum and maximum flow rate in m3/h, operating pressure in bar, fuel temperature range, the pipe size (DN) at the meter run, and the required hazardous area classification (ATEX or IECEx). Also note if you need a batch controller or just a raw pulse output. Email this data and we will return a full technical proposal with a dimensional drawing within one working day.
Silver Automation Instruments ships kerosene flow meters to airport operators across Africa, Southeast Asia, and Latin America. Every meter includes a 5-point test certificate, material inspection report, and a factory pressure test at 1.5 times the PN rating. Send your operating parameters now and receive a binding price valid for 30 days.