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Sizing a Kerosene Flow Meter for a 4-Inch Storage Tank Intake
Quick Answer: For a 4 inch kerosene storage tank intake line, size your flow meter to measure 30 to 60 m³/h at a typical filling velocity of 2 to 3 m/s. An oval gear meter with a pulse output or a Coriolis mass flow meter gives you the repeatability and accuracy a fuel depot needs. Silver Automation Instruments ships both types with ATEX Zone 1 and IECEx approvals, 4-20 mA HART, and a local totalizer to customers in Southeast Asia, the Middle East, and Africa.
Why a 4 Inch Line Is the Standard for Kerosene Storage Tanks
Many bulk kerosene storage tanks in Indonesia, Nigeria, and Vietnam use a 4 inch (DN100) intake line. The reason is simple. A 4 inch pipe can move 40 to 65 cubic meters per hour with a pressure drop that stays below 0.5 bar. That flow range matches the typical unloading rate of a road tanker or an intermediate pump station. Engineers at fuel terminals do not want to oversize the line. A larger pipe adds cost and reduces flow velocity, which can cause sediment buildup over time. A smaller pipe forces a higher velocity and more wear on the meter. A DN100 pipe balances both sides.
Here is the thing. Kerosene is a thin hydrocarbon with a viscosity around 2 to 5 cSt at 25 °C. It behaves almost like water. That means you can use a turbine meter, but many operators in hot climates tell us they get better long-term results from positive displacement meters. One fuel depot in Thailand replaced a turbine meter on a 4 inch kerosene intake because small particles in the line were damaging the blades. They switched to a Silver Instruments oval gear flow meter rated for 0.5% accuracy and the maintenance calls stopped.
How to Pick the Right Flow Meter Technology for Kerosene
You have three realistic options for a 4 inch kerosene storage tank intake.
Oval gear meters are the most popular choice we see today. They measure the exact volume of fluid passing between two oval gears. Because kerosene has some lubricity, the gears move smoothly. These meters require no straight pipe runs, so you can mount them right after an elbow or a valve. A DN100 oval gear meter from Silver Instruments handles 1 to 70 m³/h, works up to 55 bar, and comes with a pulse output for batching or a 4-20 mA signal for the control room. We pre-configure the totalizer so operators can read the daily kerosene intake without a PLC.
Coriolis mass flow meters are the option when the depot needs mass in kg instead of volume in liters. Kerosene density changes with temperature. A fuel truck at 35 °C in Saudi Arabia delivers fewer kilograms than the same volume at 25 °C. A Coriolis meter measures mass flow directly and does not care about temperature or density variation. The Silver Instruments Coriolis meter for a 4 inch line covers 0 to 60,000 kg/h with 0.15% accuracy. It also gives you density and temperature readings in real time. This helps with custody transfer and excise tax reporting in markets like Brazil and Kenya.
In practice, most engineers skip turbine meters on kerosene intake lines because kerosene has low lubricity compared to diesel. The bearings wear faster. We have seen this on customer sites in East Africa where turbine meters lasted less than 18 months on a 4 inch kerosene line. If you must use a turbine, pick one with ceramic bearings and plan a filter upstream. Still, an oval gear meter usually costs 30% less over a 5-year service life when you add maintenance time.
Vortex flow meters can also work. A DN100 vortex meter from Silver Instruments measures 8 to 150 m³/h with a 1% accuracy. It has no moving parts, so you get a long fit-and-forget life. The downside is a minimum straight pipe requirement of 15D upstream and 5D downstream. That is not always easy on a tank intake with limited space. We recommend vortex only when the pipe run is long and you need an ATEX-certified meter without any liquid contact parts that could clog.
Sizing the Meter: DN100, Flow Range, and Pressure Drop
Your 4 inch kerosene line has an internal diameter close to 100 mm. For a filling rate of 45 m³/h, the velocity is about 1.6 m/s. At 60 m³/h it jumps to 2.1 m/s. You want to keep the velocity below 3 m/s to avoid water hammer and excess noise. So pick a meter that covers 10 to 80 m³/h with a turndown of at least 10:1. A Silver Instruments oval gear meter for DN100 provides a 1:70 turndown, which means you can measure filling rates as low as 1 m³/h when the tank is alm
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A customer in Ghana asked us last year to size a meter for a 4 inch kerosene intake from a 40-bar pump. The operating pressure was steady at 25 bar, kerosene temperature 30 °C. We recommended a DN100 oval gear meter with a 300 bar body and a PT100 temperature sensor integrated to correct volume to 15 °C. The meter shipped with a factory calibration certificate traceable to ISO 17025. The installation took two hours. The depot now has a daily batching totalizer that matches their tank gauging within 0.3%.
Pressure drop matters. Across an oval gear meter, the loss at 60 m³/h is typically 0.3 to 0.5 bar. A Coriolis meter for the same line can add 0.7 to 1 bar depending on the tube design. Make sure your transfer pump can overcome that extra head. We always ask for the pump curve so we can check the net positive suction head and avoid cavitation during high-flow intake.
Certifications, Signal Outputs, and On-Site Setup
Kerosene vapors create a Zone 1 hazardous area in most storage tank farms. The flow meter and its electronics need ATEX, IECEx, or equivalent local certification. Silver Instruments meters ship with ATEX II 2G Ex db IIC T6 Gb as standard for the 4 inch size. For markets like Australia and New Zealand we supply IECEx-certified versions. If your site follows NFPA standards, we can provide a version with FM approval.
The output signal is not a minor detail. Most tank intake systems use a PLC or a remote I/O panel. The meter should give you a 4-20 mA HART signal so you can read flow rate, totalizer, and diagnostic data on one pair of wires. We also add an isolated pulse output for batching controllers or local display units. The pulse resolution on our DN100 oval gear meter is 10 pulses per liter, which gives you fine control for small top-up batches.
Because the meter goes on an intake line, you may want a local display that shows the batch total and the instantaneous flow rate. We pre-program the display in liters or kilograms based on the customer location. A fuel distributor in Mexico chose a dual display in liters and US gallons. We set it up at the factory and shipped it with a 5-point calibration at 10, 25, 50, 75, and 100% of full scale.
A Real-World Quote Request: What We Need from You
Most inquiries for a 4 inch kerosene flow meter start with a simple email. But to get the sizing right the first time, we need four numbers. Send us your operating pressure in bar, kerosene temperature in °C, pipe size DN, and the max flow rate you expect in m³/h or kg/h. If you have a pump datasheet, attach it. We will check the pressure drop, the velocity, and the meter material compatibility within one working day. Then we send a full quotation with a dimensional drawing and a delivery schedule. No generic forms. No chatbots. Reach our engineering team at [email protected] with “4 inch kerosene flow meter” in the subject line.
Frequently Asked Questions
What flow meter technology is best for kerosene in a 4 inch line?
A positive displacement oval gear meter offers the best balance of accuracy, low maintenance, and no straight pipe requirement. A Coriolis meter is the upgrade path if you need mass flow and density data for custody transfer.
How do I calculate the flow rate for a 4 inch kerosene intake?
Measure the internal diameter in mm. A DN100 pipe has about 0.00785 m² cross section. Multiply by a velocity of 2 m/s to get 0.0157 m³/s, which is 56.5 m³/h. Adjust for your pump capacity and use that as the meter upper range.
Can I use a turbine flow meter for kerosene?
Yes, but we do not recommend it for 4 inch intake lines with possible particles or low lubricity. Oval gear meters survive longer in kerosene service. If you already own a turbine, install a 200-micron strainer upstream and check bearing wear every 6 months.
Does the flow meter need ATEX certification for kerosene storage tanks?
Almost always. Kerosene is a flammable liquid and the vapor zone around the tank intake is Zone 1 or Zone 2. Silver Instruments supplies meters with ATEX, IECEx, and FM certifications for safe operation.
What signal output do I need for a tank intake totalizer?
A pulse output connects directly to a batching controller or a totalizer counter. A 4-20 mA HART output lets your PLC read flow rate and diagnostics. We recommend having both on the same meter for flexibility.