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Heavy Fuel Oil Flow Meter DN200 for Bunkering Custody Transfer: Key Specifications
Quick Answer: For DN200 heavy fuel oil bunkering custody transfer, Silver Instruments recommends a Coriolis mass flow meter. It delivers plus or minus 0.1 percent mass accuracy across the full viscosity range of HFO, without needing temperature or density compensation. The CMF series meets OIML R117-1, handles fuels up to 380 cSt at 50 degrees Celsius, and ships with MID/MI-005 Annex MI-005 approvals for marine bunkering.
Why a DN200 Bunkering Meter Requires Special Attention
Bunkering custody transfer is a money transfer. A one percent error on a 2000 tonne HFO delivery can cost USD 20,000 at current IFO380 prices. That is why port authorities in Singapore, Rotterdam, and Fujairah enforce strict meter requirements. Large pipe sizes like DN200 are common on bunker barges because the fuel needs to be pumped fast. Process managers ask for flow rates above 500 cubic meters per hour to minimize port stay. However, high flow does not mean easy flow. Heavy fuel oil is dirty, viscous, and carries suspended solids. Most flow meter technologies cannot keep accuracy when the Reynolds number drops below 10,000 during cold fuel recirculation. Here is the thing. Coriolis meters do not rely on the Reynolds number at all. They measure mass directly.
Challenges of Measuring Heavy Fuel Oil in Custody Transfer
Heavy fuel oil at 50 degrees Celsius often sits between 180 and 380 cSt. During winter bunkering in Northern Europe or China, the fuel can arrive at 30 degrees Celsius, pushing viscosity past 600 cSt. Volumetric meters like turbine or ultrasonic devices lose accuracy in this zone. Positive displacement meters work, but their moving parts wear fast when abrasive cat fines are present. Coriolis meters solve both problems. They have no moving parts in the flow stream and give a mass flow reading that is unchanged by viscosity shifts. Still, one detail that most engineers skip is the pressure drop. A straight-tube Coriolis meter in DN200 will add around 0.3 bar of pressure loss at 600 cubic meters per hour. That is acceptable on a bunker barge where pumps can push 10 bar. But it must be checked against the barge’s pumping curve.
Another practical point is air entrainment. Bunker hoses often drain between deliveries. When the pumping starts, a slug of air goes through the meter. Silver Instruments CMF meters have a built-in two-phase flow detection algorithm. It flags the batch when the gas volume fraction exceeds 2 percent, so the bunker operator can pause and re-verify zero. A paint manufacturer in Vietnam told us that this single feature caught three air void incidents in the first month and saved them from a billing dispute.
Recommended Flow Meter: Silver Instruments CMF Series Coriolis
The model we quote most for DN200 HFO bunkering is the CMF-200-CSS. It is a stainless steel straight-tube Coriolis meter with 8-inch ANSI 150 flanges, rated for process temperatures up to 180 degrees Celsius. Mass flow accuracy is 0.10 percent of rate for liquid mass, repeatability 0.05 percent. Density accuracy is 0.5 kilograms per cubic meter. The transmitter has 4-20 mA HART, Modbus RS485, and a custody transfer pulse output with a resolution of 10,000 pulses per kilogram. It is certified for ATEX Zone 1 and IECEx, which covers the safety requirements on bunker tankers. The meter also stores 3,000 batch records internally, each with time stamp, average density, average temperature, and total mass. During a Port State Control inspection, the surveyor can scroll through the records without a laptop.
Calibration is done at our factory on a certified mass flow rig using heavy fuel oil simulant at 200 cSt. We do not use water calibration and apply a viscosity correction factor. That approach causes errors above 0.3 percent with real HFO. Our test procedure is documented in a four-page calibration certificate that accompanies every custody transfer me
Real-World Installation: Singapore Bunker Supplier
Last year, a bunker supplier in Singapore replaced three 10-inch PD meters with our CMF-200-CSS on a 5,000 DWT barge. The PD meters had mechanical wear issues because of cat fines and required monthly proving. With the Coriolis meters, proving intervals moved to six months, approved by the Maritime and Port Authority of Singapore. The uncertainty of the Coriolis system was 0.08 percent during the proving runs, versus 0.25 percent for the old PD meters. The pipe run required only three diameters upstream and two downstream, which fitted the barge’s tight engine room. After installation, the barge crew reported that the mass-based measurement eliminated paper tables for volume correction to 15 degrees Celsius. In bunkering, the bill of lading numbers now come directly from the meter’s custody transfer pulse output, without human conversion errors.
FAQ: Heavy Fuel Oil Flow Meter DN200 Custody Transfer
Can a Coriolis meter handle high-viscosity HFO without losing accuracy? Yes. Mass flow measurement is independent of viscosity. The point of concern is pressure drop. We size the meter to stay below 1 bar pressure loss at maximum flow, so the pump does not struggle. For HFO above 700 cSt, we heat the meter block with a jacket or trace heating. The sensor housing can accommodate a heating system for trace heating up to 150 degrees Celsius.
Is DN200 a standard size for custody transfer Coriolis meters? Yes. Silver Instruments manufactures Coriolis meters from DN15 up to DN300. The DN200 size is common for bunkering because it matches the 8-inch ANSI schedule 40 pipe used on most bunker tankers and receiving ships. The meter weight is 320 kilograms, and lifting lugs are included for crane installation on deck.
What certifications are needed for a bunkering custody transfer flow meter? At minimum, OIML R117-1 or MID MI-005. Plus, a national type approval from the port state. Our CMF series carries OIML certificate R117/2012-SG-22.03 and can be supplied with a Singapore MPA letter of acceptance. We also provide a MID declaration of conformity for European flagged vessels. The pulse output is encrypted per WELMEC 8.8 to prevent tampering.
How do you deal with air slugs in the fuel line? The transmitter monitors the density signal in real time. If the measured density drops below 700 kilograms per cubic meter for more than two seconds, the meter enters alarm mode. The batch totalizer freezes, and a dry contact relay opens. Once the operator bleeds the air and the density returns to normal range, the batch can be resumed or cancelled. This function is enabled by default on all our custody transfer firmware versions.
What is the typical price of a DN200 HFO bunkering flow meter? A single CMF-200-CSS custody transfer package, including the sensor, transmitter, calibration certificate, and pulse output isolator, is quoted depending on the hazardous area certification and the country of destination. Send us your pressure (bar), temperature range (degrees Celsius), pipe size (DN), and required flow range (cubic meters per hour) at our HFO flow meter inquiry page. We return a guaranteed delivery time and a fixed price within two working days.
Get Your DN200 HFO Bunkering Meter Quote
Tell us the operating conditions. We need the normal and maximum flow rate, the HFO grade (RMG 380, RMK 500, etc.), the fuel temperature at the meter inlet, the maximum working pressure, and the hazardous area classification. We recommend a straight-tube Coriolis meter for HFO because it is self-draining and requires almost no straight run. You can see our Coriolis mass flow meter for heavy fuel oil selection guide with full technical dimensions. Send us your pressure (bar), temperature (degrees Celsius), pipe size (DN), and flow range now. We reply with a data sheet marked with your duty point and a firm price.