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Biodiesel Flow Meter DN100 Plant Intake Manifold Sizing Rules
Quick Answer: For a DN100 biodiesel intake manifold, size the flow meter based on the minimum and maximum flow rates you actually run, not the pipe diameter. Positive displacement meters like oval gear types handle viscosity changes from biodiesel feedstocks far better than turbine or differential pressure devices. Send your flow range in m3/h, biodiesel blend, and inlet pressure to Silver Automation Instruments for a direct meter model and price.
Why Pipe Size Alone Causes Metering Mistakes
A DN100 schedule 40 pipe can carry about 100 m3/h of biodiesel at 1.5 m/s velocity. But most biodiesel plants pull intake flow rates way below that during startup or partial production. A plant in Thailand producing B100 from used cooking oil runs its DN100 intake manifold at 8 m3/h during the heating phase and 45 m3/h at steady state. When they installed a DN100 turbine meter, low flow caused the rotor to stall. Errors went beyond 20 percent. The meter was simply too large for the actual range.
In practice, engineers often specify the meter size equal to the pipe size. That approach fails with biodiesel because the fluid viscosity of 4 to 7 cSt keeps the Reynolds number low at reduced flows. Turbine and vortex meters lose linearity. Magnetic flow meters do not work at all because biodiesel is non-conductive (conductivity below 0.01 uS/cm). Your options narrow to positive displacement or Coriolis.
Oval Gear Meters: The Practical Choice for DN100 Intake
A Silver Instruments OGM series oval gear meter is built for this job. You can select a DN80 meter body mounted in the DN100 line with concentric reducers. The reduced bore increases fluid velocity to 2 to 3 m/s at your normal flow. Accuracy stays within plus minus 0.5 percent across a 10:1 turndown. If your minimum flow drops further, a DN50 meter with a bypass can handle turndowns beyond 20:1.
Last year a biodiesel terminal in Cartagena, Colombia, asked us to resolve errors on their custody transfer skid. The original DN100 turbine meter was drifting by 2 percent between summer and winter because B100 viscosity changed from 4.5 cP at 40 degrees C to 7.2 cP at 25 degrees C. We replaced it with a Silver Instruments oval gear meter with a built in PT100 and an external flow computer. The flow computer corrects volume to 15 degrees C per ASTM D1250. Now they achieve 0.2 percent repeatability year round. That installation has been running without filter cleaning for 8 months.
Sizing Rules Based on Real Plant Data
Rule 1: Measure your minimum flow, not just the design flow. Read the pump curve and the VFD setting. If your lowest intake rate is 5 m3/h on a DN100 pipe, a full bore meter will be at 5 percent of its range. That is unusable. Size the meter so that the minimum flow sits above 10 percent of the meter capacity.
Rule 2: Check pressure drop at maximum viscosity. Biodiesel viscosity peaks at the lowest operating temperature. A DN80 oval gear meter at 50 m3/h and 7 cP drops about 0.25 bar. If your inlet head is limited (gravity feed from a day tank), confirm the allowable loss. Our application engineers can calculate the pressure drop curve in Excel and send it to you within 24 hours.
Rule 3: Add
Rule 4: Pick the right output. Most intake manifolds connect to a PLC or batch controller. Silver Instruments meters offer pulse output (open collector or NAMUR) and 4-20 mA HART for flow rate. Request ATEX Zone 1 certification if your plant processes biodiesel with methanol traces during distillation. We supply meters with Ex ia IIC T4 and Ex db certificates.
When to Choose a Coriolis Meter Instead
If you need mass flow measurement in kg/h, direct custody transfer accuracy, or fluid density monitoring, a Silver Instruments Coriolis mass flow meter solves all three. A DN50 Coriolis meter fits the same DN100 line using adapters and handles 0.5 to 50 tonne per hour of B100. The meter measures mass flow, density, and temperature. With density you can detect air slugs or off spec biodiesel in real time. A biodiesel plant in Malaysia uses this setup on their intake manifold to log density and cut off supply if water contamination exceeds 500 ppm. The Coriolis meter from Silver Instruments is the model CMF-DN50 with Hastelloy C22 wetted parts for acid resistance.
What to Send Us for a Fast Sizing
Do not waste time with generic quotes. We need four numbers from you: biodiesel blend (B100, B20), minimum and maximum flow rate in m3/h, inlet pressure in bar, and operating temperature range. We will select the meter body size, flange rating (ANSI 150 or PN16), seal material (FKM or PTFE), and signal output. You get a one page datasheet with an accuracy curve and a price in USD within the same business day. Reach our engineers at Silver Automation Instruments through the contact form on flow-meter dot com dot au.
Frequently Asked Questions
Q: Can a magnetic flow meter measure biodiesel?
A: No. Biodiesel has almost zero conductivity. Magnetic flow meters need a liquid with at least 5 uS/cm. Use an oval gear or Coriolis meter.
Q: How do I handle viscosity changes with temperature?
A: Add a PT100 temperature sensor to the flow meter. A flow computer or PLC can correct the volume to 15 degrees C. Silver Instruments oval gear meters have an integrated PT100 pocket as standard.
Q: What is the typical turndown for a DN100 oval gear meter?
A: With biodiesel, a 10:1 turndown is safe. For example, 5 to 50 m3/h. Below that, we recommend a smaller meter size or a dual meter manifold.
Q: Do I need straight pipe runs?
A: No. Positive displacement meters do not need upstream straight runs. You can mount the meter right after a 90 degree elbow. This makes the intake manifold compact.
Q: Can I get a meter with ATEX certification for biodiesel?
A: Yes. Silver Instruments provides ATEX and IECEx certified oval gear and Coriolis meters. Specify Zone 1 or Zone 2 when you request a quote.
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