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Flow Meter Marine Applications: Rugged Heavy Fuel Oil Optimizers for Ship Bunkering
Quick Answer: Heavy fuel oil bunkering needs a flow meter that handles high viscosity, high temperature, and barge movement. Silver Instruments recommends a Coriolis mass flow meter for custody transfer in kg/h or t/h. A lower cost backup is an oval gear flow meter with a heating jacket.
Heavy Fuel Oil Is Not a Clean Water Application
Marine grades like RMG 380 sit around 380 cSt at 50°C. At lower temperatures the viscosity climbs fast. That puts extra force on rotors and flow tubes. Standard turbine meters struggle because heavy oil coats the blades. The K factor drifts at low and high flow. This drift creates disputes between barge operators and vessel engineers.
Engineers from ship management companies in Singapore, Vietnam, and the UAE send us the same specs. They need flow measurement from 10 m3/h to 300 m3/h on bunker barges. They need readings that match the bill of lading within 0.5 percent or better.
Mass Flow Beats Volume Flow For Custody Transfer
Bunker deliveries are sold by metric tons. A volume meter gives only part of the answer. You need density and temperature to convert volume to mass. That conversion adds error when fuel temperature changes between storage and delivery.
A Coriolis mass flow meter reads mass, density, and temperature directly. Silver Instruments supplies the SIL-CMF series for this job. The meter outputs kg/h, t/h, density in kg/m3, and temperature from a built in PT100. Accuracy for mass flow is around 0.1 to 0.2 percent of rate across a 20:1 turndown.
Coriolis Meters For Bunker Barges
Silver Instruments suggests the SIL-CMF series with DN15 to DN150 line sizes. DN80 and DN100 are common for barge manifolds. Flow rates range from about 1 t/h to 120 t/h depending on pressure drop and velocity. Wetted parts can be 316L stainless steel with no moving parts. Pressure rating is usually PN40 or ANSI 150 lbs to match bunker hoses.
For hazardous areas on tankers, choose an ATEX Zone 1 or IECEx certified transmitter. The signal output is normally 4-20 mA HART plus pulse. Some terminals also have RS485 Modbus for a barge control system. One issue with Coriolis meters is start up with empty pipes. Air pockets after hose connection cause reading errors. Purge the line slowly before starting the transfer.
Oval Gear Meters For Lower Budget Bunker Skids
Not every bunker station has the budget for Coriolis. Silver Instruments supplies the SIL-OG series oval gear flow meter. These meters are used in Indonesia, the Philippines, and Nigeria for diesel and heavy fuel oil transfer. Marine gas oil can drop below 10 cP at 40°C. For heavy oil, request a heating jacket around the measuring chamber. Steam or hot oil at 120 to 160
Accuracy is around 0.5 percent of reading within a defined viscosity band. When viscosity swings from 50 cSt to 500 cSt, the meter needs a correction curve. Install a Y strainer before the oval gear meter. We have seen debris from storage tanks jam the gears on a supply barge in Batam.
Marine Installation Notes
Bunker hoses flex and move. Rigid pipe runs near the meter cause stress. Always support the pipe on both sides of the flow meter. Keep the meter full during measurement. A back pressure valve downstream prevents flashing when heavy oil is hot.
For Coriolis meters, avoid mounting the sensor at the top of a vertical pipe. A horizontal installation with the sensor tubes down is more stable. For oval gear meters, keep the meter level and align the inlet and outlet correctly.
Typical Configuration For A Southeast Asia Bunker Barge
A bunker supplier in Singapore ordered a SIL-CMF series meter for a 5000 dwt bunker tanker. Line size was DN100. Fuel was RMG 380 at 120°C. Flow rate during delivery was 40 to 80 t/h. Across twelve deliveries, the average deviation was 0.15 percent compared to shore tank gauging.
Another customer in Vietnam needed a lower cost option for a 2000 ton coastal bunker barge. We supplied two SIL-OG oval gear flow meters with heating jackets. The meters were DN80 and used for marine gas oil and a light fuel oil blend. Flow range was 5 to 30 m3/h.
FAQ
What flow meter does Silver Instruments recommend for heavy fuel oil bunkering?
Use a Coriolis mass flow meter like the SIL-CMF series when your sale is based on metric tons. For lower budgets, use a SIL-OG oval gear meter with a heating jacket.
What accuracy is realistic for marine bunker custody transfer?
Coriolis meters reach 0.1 to 0.2 percent of rate for mass flow. Oval gear meters reach 0.5 percent of rate within a defined viscosity range.
Which line sizes fit a typical bunker barge manifold?
DN80 and DN100 are common for flow rates from 20 to 120 t/h. Smaller service boats use DN25 to DN50. Large bunker tankers may use DN150.
Can these meters work in ATEX Zone 1 areas on tankers?
Yes. The SIL-CMF and SIL-OG series can be supplied with ATEX Zone 1 or IECEx certification.
What output signals do the meters provide for a barge control system?
Coriolis meters normally include 4-20 mA HART, pulse, and RS485 Modbus. Oval gear meters can have pulse or 4-20 mA with a transmitter.
Send your fuel type, viscosity in cSt, pipe size in DN, flow range in kg/h or m3/h, and hazardous area zone to Silver Automation Instruments. We will quote a meter for your bunker barge or terminal. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
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