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Kerosene Flow Meter Selection: Explosion-Proof Positive Displacement Spur Gear Instruments for Fuel Deliveries
Quick Answer: For kerosene fuel deliveries, select an explosion-proof positive displacement spur gear meter with ATEX Zone 1 certification and a flow range that matches your truck pump. A DN15 or DN25 Silver Instruments GF meter handles most batch deliveries from 1 L/min to 120 L/min with accuracy near ±0.5% of reading.
Why a Spur Gear PD Meter Works for Kerosene Deliveries
Kerosene has low viscosity and low lubricity. A turbine meter can slip at low flow. Inferential meters lose accuracy when the delivery pump starts and stops. Positive displacement gear meters trap fixed volumes between rotating gears. Each pocket passes a known volume per pulse. That gives batch total accuracy even at start and stop. For a fuel delivery truck, the meter sits between the pump and the hose reel. Flow often starts at a low rate. It then rises to full pump output. A PD spur gear meter keeps counting every small pocket. This is what you need for invoicing by litres.
Hazardous Area Ratings Come First
Kerosene vapour can form a flammable atmosphere around the meter during loading and unloading. Do not install a general purpose flow meter on a fuel truck. The meter body, sensor, and cable glands must carry an Ex rating for Zone 1 or Zone 2 based on local site rules. Silver Instruments supplies the GF fuel gear meter with Ex d IIC T6 or Ex ia IIC T6 options. Order the Ex d version when the meter sits close to the pump and hose reel. Use Ex ia pulse or 4-20 mA HART output when the control panel sits in a safe area. The transmitter housing is aluminum with stainless steel internals. Rotors can be PPS or aluminum. For kerosene, PPS rotors reduce friction and extend service life. Stainless steel rotors are available for contaminated fuels.
Flow Range and Pressure Drop
Most kerosene delivery pumps on small trucks run between 20 L/min and 60 L/min. A DN15 meter with a range of 1 to 40 L/min fits smaller vans and skid units. A DN25 meter with a range of 5 to 120 L/min fits 5,000 to 12,000 litre tankers. Check the viscosity. Kerosene at 20 °C has viscosity near 1.3 cP. That is low, so internal clearances must be tight. Silver Instruments sets rotor clearance at 0.03 mm for kerosene service. The pressure drop stays below 0.5 bar at 60 L/min on DN25. If your pump delivery pressure is 4 to 6 bar, this loss is acceptable. In cold regions, kerosene viscosity increases. Tell us your minimum operating temperature. We can specify ceramic bearings for low temperature starts.
Output Signals and Register Options
A fuel delivery operator needs a local total and a remote record. The mechanical register gives a sealed batch total. In many countries, this register is accepted for custody transfer between supplier and customer. At the same time, a pulse output sends data to an electronic register or fleet management system. Silver Instruments provides a dual output option on the GF series. One side drives the mechanical counter. The other side sends a 10 to 1000 Hz pulse signal. For more advanced setups, order the 4-20 mA HART output. This output reports instantaneous flow rate to a PLC or fuel management terminal. The HART signal lets a technician configure range and damping without opening the housing. That matters in a Zone 1 area. If you need remote batch control, pair the meter with a Silver Instruments batch controller in a safe area panel.
Materials and Installation Notes
Kerosene can swell some rubber seals. Use FKM or PTFE seals. Buna N is not recommended for continuous kerosene service. The GF meter body is available in cast aluminum or 316 stainless steel. Aluminum is lighter for truck mounting. Stainless steel is better for coastal fuel depots where salt air attacks aluminum. The measuring chamber has PPS gears as standard. For high flow or frequent daily use, specify hard anodized aluminum gears. The shaft uses tungsten carbide or ceramic bearings. This combination keeps friction low and extends the time between rebuilds. Because kerosene does not lubricate like diesel, bearing choice matters more than many buyers expect.
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In practice, some crews skip the strainer. This is a mistake. Kerosene tanks can carry rust, sand, and pipe scale. A 100 mesh strainer before the meter protects the gears. Do not deadhead the pump against a closed valve. Install a bypass or pressure relief valve. Air in the measuring chamber causes lost pulses. Mount the meter below the hose reel or install an air eliminator. Keep the meter full of liquid between deliveries. Drain the meter if the truck will stand idle in freezing conditions. Silver Instruments supplies the GF series with a built in air eliminator as an option. This option adds 80 mm to the length but saves many batch errors on small deliveries.
Model Selection for Common Truck Sizes
For a small delivery van with a 40 L/min pump, select the Silver Instruments GF-DN15-EXD-FKM. That model has a cast aluminum body, Ex d IIC T6 pulse output, FKM seals, and a 1 to 40 L/min range. For a 6,000 litre tanker with a 90 L/min pump, select the GF-DN25-EXD-HART-FKM. That model has a 5 to 120 L/min range, 4-20 mA HART output, mechanical register, and hard anodized aluminum gears. Both models accept a PT100 temperature sensor if you need temperature compensation for volume correction.
Field Problems We See on Fuel Deliveries
One issue is registering flow when the nozzle is nearly closed. A turbine meter undercounts at 5 L/min. A PD gear meter still counts each pocket. Another issue is pressure spikes from positive displacement pumps. Add a pulsation dampener if the pump has a single piston or diaphragm design. We have seen cracked gear teeth from water hammer. The fix is a check valve and pressure relief set at 7 bar. Air in the system is the third issue. If the batch total is lower than the tank dip reading, check for air leaks on the suction side. Tighten the camlock fittings and inspect the hose for pinholes.
Last year a fuel distributor in Vietnam replaced a turbine meter with a Silver Instruments GF DN25 on a 6,000 litre kerosene truck. The batch errors dropped from 3% to 0.4% after the first week. The main reason was the PD gear meter does not depend on swirl and straight pipe runs.
Request a Quote with Specific Data
Do not send only the word kerosene. We need five data points to select the right flow meter. Send us the flow range in L/min, the pump discharge pressure in bar, the minimum and maximum product temperature in °C, the pipe size or hose size in DN, and the hazardous area classification. Also tell us the country for the fuel truck registration. We ship to Southeast Asia, the Middle East, Africa, Latin America, and Oceania. We keep stock of DN15 and DN25 GF kerosene meters in our Nanjing warehouse. You can reach Silver Instruments by phone at +86-25-68650347, by WhatsApp at +86-25-52155837, or by WeChat at +86 15365082610.
Frequently Asked Questions
Can a diesel flow meter be used for kerosene? Yes if the seals are FKM or PTFE and the rotor material is compatible. Kerosene has lower lubricity than diesel. Some diesel meters with carbon bearings will wear faster on kerosene. Ask for ceramic or tungsten carbide bearings.
What accuracy can I expect on a delivery truck? Expect ±0.5% of reading across the normal 20 to 60 L/min range. At very low flow below 5 L/min, the error may rise to ±1.0% on some models. Batch repeatability is normally ±0.1% or better.
Do I need an air eliminator on a kerosene PD meter? If the meter is mounted above the tank outlet and the hose drains between deliveries, yes. Air pockets cause under registration. A built in air eliminator vents air before the measuring chamber.
Is a mechanical register enough for custody transfer? In many countries a sealed mechanical register is accepted for truck delivery. For electronic records, add a pulse output to a register printer or fleet system. The GF series can provide both signals at the same time.
Can the meter handle kerosene at low temperatures? Yes. Specify ceramic bearings and confirm the minimum operating temperature. Kerosene viscosity increases in cold climates. The meter range may shift slightly. Silver Instruments can calibrate the meter at your expected operating temperature.
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