『Bunker Oil Flow Meter 1/2 Inch: Dosing Chemical Dispersants and Stabilizers』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
Bunker Oil Flow Meter 1/2 Inch: Dosing Chemical Dispersants and Stabilizers
Quick Answer: For dosing chemical dispersants and stabilizers into bunker oil, a 1/2 inch flow meter must handle low viscosity fluids, small flow rates (often below 20 L/h), and resist aggressive additives. Silver Instruments recommends the OG series oval gear flow meter for dispersants under 5 cP or the CMF micro Coriolis mass flow meter for viscous stabilizers and higher accuracy. Both offer DN15 connections, 4-20 mA HART output, and ATEX Zone 1 options.
Bunker oil systems rely on precise chemical dosing to prevent asphaltene sludge and improve fuel stability. Chemical dispersants and stabilizers are injected through small bore pipes. A 1/2 inch flow meter sits on the dosing line. It measures the exact volume dosed in real time. Most engineers skip the cheap turbine meters here. They drift fast. The chemical eats the bearing. You need a meter designed for low flow and chemical resistance.
Silver Automation Instruments supplies two go to solutions. First is the OG series oval gear flow meter. It works with thin dispersants from 0.5 cP up. Accuracy is ±0.5% of reading. Flow ranges from 0.5 to 30 L/h on the 1/2 inch DN15 model. Wetted parts are 316L stainless steel, PEEK gears, and PTFE seals. This combination handles diesel based carriers, aromatic solvents, and most amine type dispersants. Output is 4-20 mA HART. You can direct wire to the bunker control panel or PLC. We often supply with a local display for field reading. Pressure rating goes to 40 bar. That covers typical injection pump discharge.
In practice, we see many ships and barge operators in Southeast Asia using the OG15 for dispersant dosing. A Vietnam based bunker chemical supplier reported back to us. They dose 2.5 L/h of a dispersant into HFO at 150 bar fuel line pressure. The meter sits before the injection quill. Pressure is 1.2 bar. Temperature is 30°C. The meter has run 18 months without re-calibration. They just flush with diesel once a month. Because the oval gear cavity is small, the meter holds only a few ml of chemical. That means no dead volume and no cross contamination between batches.
But if your stabilizer is thicker. Something like a 200 cP polyisobutylene based stabilizer. Then you need a different approach. The oval gear meter works but the pressure drop goes up in cold start. Here is the thing. A Coriolis mass flow meter measures mass directly. It does not care if the viscosity changes from 20 cP to 200 cP with temperature. We recommend the CMF micro Coriolis flow meter. It has a 1/2 inch process connection. Flow range is 0.1 to 60 kg/h. Accuracy is ±0.1% for mass flow. Density measurement is built in. You get kg dosed, not liters. That matters because the stabilizer density can vary by 2% between batches. With a volumetric meter you over or under dose by 2%. With a Coriolis meter you hit the target weight every time. Yes, the price is higher. But many Middle East and West Africa based operators choose this because they dose expensive stabilizers. Overdosing 2% on a 2000 L/month consumption is
Connection sizes matter. For 1/2 inch lines we offer DN15 threaded BSP/NPT or small ANSI 1/2 150 lb flanges. The OG15 is compact. Length is 120 mm. Weight is 2.6 kg. It mounts directly in the pipe without support brackets in most cases. The CMF micro meter needs a short support because of the dual tube vibration loop. But both meters are rated IP67. ATEX Zone 1 Ex ia IIC T4 certification is available. You just tell us the gas group and temperature class. Most bunker operations require ATEX because the chemical storage area is rated Zone 1.
We have seen many customers from Africa get stuck on signal output. Their PLC only accepts 4-20 mA with HART. So our standard configuration includes a 2 wire loop powered transmitter. On the OG series we use a PT100 sensor for temperature compensation inside the meter. The Coriolis meter has an on board DSP and outputs Modbus RTU over RS-485 plus a 4-20 mA HART channel. Both meters accept 24 V DC supply. You do not need an external power conditioner.
So what should you send us for a quote. Send the fluid name or chemical type. Viscosity in cP at pumping temperature. Flow rate range in L/h or kg/h. Pipe size DN15 or DN20. Pressure at the meter location in bar. Temperature in °C. Ambient zone classification. We then match the meter and wetted materials. A typical dosing line for dispersant uses PTFE or Viton seals. For stabilizer with aromatic solvent we spec Kalrez or EPDM. Missing this detail causes seal swell and meter lock. We check that before shipping. Some competitors ship standard Buna N and then the meter leaks after one week. We do not do that.
FAQ
What flow meter works best for chemical dispersant dosing in bunker oil lines? The OG oval gear flow meter. It handles low viscosities down to 0.5 cP and small flow rates. It gives ±0.5% reading accuracy with 4-20 mA HART output.
Can a 1/2 inch flow meter handle low viscosity fluids like diesel based dispersants? Yes. Oval gear meters with PEEK internals and PTFE seals measure down to 1 cP. The close clearance design minimises slip. Calibration by Silver Instruments ensures repeatability at 1 L/h.
Do I need an ATEX certified flow meter for bunker oil chemical dosing? Usually yes. Most chemical dosing skids are in Zone 1 areas. Silver Instruments offers ATEX Zone 1 certification on the OG and CMF series. Specify the gas group and temperature class when ordering.
How do I choose between an oval gear meter and a Coriolis meter for stabilizer injection? If the stabilizer viscosity is stable and below 50 cP, the oval gear meter is cost effective. If viscosity varies widely or density changes by more than 1% between batches, use a Coriolis mass flow meter. It measures kg dosed directly and ignores density shifts.
What output signal should I request for integration with a bunker management system? Request 4-20 mA HART. It carries both the analog flow signal and digital diagnostics on the same two wires. Silver Instruments supplies this as standard. Modbus RTU is also available on the Coriolis meter.
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