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Aircraft Fuel Flow Meter: Aviation Fuel Management Indicators
Quick Answer: Silver Instruments supplies Coriolis mass flow meters and oval gear flow meters for direct mass measurement of Jet A-1 and Avgas. These meters eliminate the density correction steps required by turbine meters, delivering repeatable accuracy of ±0.1% to ±0.2% of rate. They are built for refueling trucks, depot load stands and engine test benches where custody transfer or precise fuel accountability is mandatory.
Why Mass Direct Matters More Than Volume in Aviation Fuel
Jet fuel expands roughly 0.09% per degree Celsius. A 20 °C temperature shift on a 20,000‑litre trailer load changes the volume by more than 360 litres without any fuel lost or gained. Turbine and positive displacement meters count volume, so site teams set up density readings and manual tables to back‑calculate mass. That manual loop introduces drift, bookkeeping errors and disputes every time an invoice lands on a desk. Silver Instruments takes a simpler path. We recommend a Coriolis mass flow meter that weighs the fuel directly in kg/min. The reading you see on the local display equals billable kilograms, no ASTM Table 53 corrections needed. This approach is common now in the Middle East and Southeast Asia, where fuel farm operators in Oman and a regional airline in Manila have switched to direct mass to stop reconciliation arguments.
Types of Flow Meters We Apply on Jet Fuel and Avgas
Most aircraft fuel skids still run turbine meters, and that is fine for volume‑only batching. But when a maintenance hangar or an engine test cell asks for repeatable mass data, we step up to Coriolis technology. For lower flow rates and smaller pipe sizes such as DN15 or DN20, oval gear meters work well on clean Avgas and test‑stand kerosene circuits. Here is a practical comparison we share with customers. A turbine meter paired with a density sensor can deliver ±0.3% mass accuracy on a good day. A straight‑through Coriolis meter with no moving parts holds ±0.1% of rate across a 20:1 turndown and measures density at the same time. That density signal also flags fuel batch degradation or water ingress, something the density loop alone often misses. For depot loading arms handling 500 to 1200 L/min, we typically propose a dual‑tube Coriolis meter in DN50 or DN80 with 4‑20 mA HART output and PT100 temperature compensation. For a refueling truck with limited straight run, an oval gear meter in ductile iron or stainless steel offers a compact, pulse‑output solution that fits between the filter separator and the delivery hose real.
A Real Refueling Truck Upgrade in Vietnam
Last year a ground handling contractor at Tan Son Nhat Airport asked us to replace three aging mechanical turbine registers that were leaking pulse signals. The tanker held 18,000 litres of Jet A-1 and dispensed through a 2‑inch line. Their biggest headache was the daily temperature reset on the batch controller. We supplied our Silver SMF series Coriolis mass meter in DN40 with an integral Ex d transmitter, ATEX Zone 1 certified for IIC gases. The installation used existing flanges and needed only 80 mm of straight pipe downstream. After commissioning, the mass totalizer matched the weighbridge ticket within 0.08% consistently over 50 loads. The operator stopped running manual density checks. The billing process went from 15 minutes per shift to an automated printout. That is the kind of tangible result engineers remember when they talk to us.
Key Specifications Engineers Ask About
We get the same technical questions every week. Accuracy class: most of our Coriolis meters for fuel custody transfer come with ±0.1% of rate for liquids above
On‑Site Verification and How We Help with First‑Time Setup
Most engineers skip the zero‑check step when a meter arrives, and that causes avoidable offset errors. We ship every Coriolis meter with a factory zero calibration report and a quick‑start video that walks the local technician through power‑up, zero verification in an empty, air‑free pipe and K‑factor matching with the batch controller. In practice, the video cuts the on‑site commissioning time to under 30 minutes. If the fuel contains entrained air after filter separator coalescence, we suggest installing an air eliminator upstream. Because air weighs almost nothing, a Coriolis meter interprets a gas bubble as a density dip and can alarm immediately if the density envelope is set tightly. That alarm has caught faulty separator elements on two sites we know of, saving the fuel quality before it reached an aircraft tank.
Frequently Asked Questions
Can I use a Coriolis meter with Jet A-1 that contains icing inhibitors? Yes. The additives do not affect the meter or its calibration. We verify this with a 316L wetted body and standard FKM seals, which are compatible with fuel additives conforming to DEF STAN 91‑91.
What is the minimum conductivity required for your meters? Coriolis meters do not need any fluid conductivity. Unlike electromagnetic flow meters, they measure mass by inertia, so dielectric constant and conductivity have zero impact. This makes them reliable for pure kerosene and Avgas UL91.
Do you supply meters with metric and imperial unit options? Every transmitter can display kg/h, kg/min, lb/min, and even US gallons based on a fixed reference density if the local regulation still requires volume backup. You select the primary unit during configuration.
How do I integrate the 4‑20 mA output into an existing PLC? The transmitter provides passive analog output, and we give you a wiring diagram for a 250‑ohm HART loop. If the PLC already reads Modbus, many customers prefer RS‑485 to get mass flow, density and temperature on three registers in one cable.
What is a realistic lead time for an Ex d Coriolis meter in DN50? For standard 316L construction with ATEX certification, we ship within 3 to 4 weeks to most Asia‑Pacific and Middle East hubs. Custom Hastelloy or PED‑compliant builds take an extra 10 working days.
Send us your fuel type, operating pressure in bar, pipe size (DN), flow range and required accuracy. Our engineers will return a datasheet and price within the same working day. Contact Silver Instruments by email at [email protected] or call +86-25-68650347. You can also reach us on WhatsApp at +86-25-52155837 or add our WeChat: +86 15365082610. When you write, mention the aircraft fuel application so we include the right certificates in the proposal.