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Bunker Oil Flow Meter DN200: Maximizing Speeds in Tanker Loading Lines
Quick Answer: A DN200 Coriolis mass flow meter reads fuel oil mass directly, ignoring volume shifts from temperature. This lets you run loading pumps at full capacity without waiting for density correction. Silver Automation Instruments supplies a compact DN200 Coriolis with ±0.1% mass accuracy, ATEX Zone 1, and 4-20 mA HART. Most terminals cut loading time by 15 to 25 percent after switching.
Why a DN200 Coriolis Cuts Bunker Loading Time
Bunker docks work on tight schedules. A 30,000 DWT tanker burning demurrage at USD 15,000 per day needs every hour back. When you load IFO 380 or VLSFO with a turbine meter, you measure volume. Fuel oil at 50 °C shrinks by roughly 1 percent for every 10 °C temperature drop. An offline densitometer fixes the numbers but forces operators to slow the pump rate to let the signal stabilize. Most crews drop from 800 m³/h to 600 m³/h just to keep the error under 0.5 percent.
A DN200 Coriolis meter from Silver Instruments ends that trade-off. It measures mass flow at the pipe wall. No density loop delay. No manual sampling. A barge loading 2,800 metric tons of low-sulfur fuel oil went from 4.9 hours to 3.6 hours after installing our CMF-DN200. That is 1.3 hours back per load. Over 200 loads a year, the terminal saved enough to pay for two spare meters.
Real Loading Line Test in Port of Tanjung Pelepas
We have seen this on a customer site many times. A bunker supplier in Malaysia ran a side-by-side test. One line used a DN200 oval gear meter plus a PT100 and a density loop. The parallel line used our Coriolis DN200 with 316L tubes and PN16 flanges. Both lines loaded the same VLSFO batch at 380 cSt. The oval gear line had to throttle back to 580 m³/h whenever a cloud of cooler fuel hit the pipe. The Coriolis line held 790 m³/h from start to finish. Mass total agreed with the barge draft survey within 0.12 percent. The tanker captain signed the bunker delivery note 45 minutes earlier than usual.
The meter body is a twin bent-tube design. It weighs 340 kg and fits between two 12-inch flanges. Silver Instruments supplies a remote transmitter with a 15-meter cable. The electronics output Modbus RTU, pulse, and two 4-20 mA HART loops. You can read mass flow, density, and temperature on a single pair of wires. The terminal tied it straight into a Honeywell Fusion4 loading computer. No signal converter needed.
DN200 Parameters That Terminal Engineers Ask For
Before quoting a DN200 bunker oil flow meter, our engineers usually ask for these numbers. They come from dozens of projects in the Middle East, Southeast Asia, and South Africa.
Mass flow range. Nominal 0 to 1,200 t/h with heavy fuel oil at 0.98 kg/litre. Turndown is 20:1. That handles both the bulk transfer and the final stripping phase in one meter run.
Line pressure. Most tanker loading arms operate at 8 to 12 bar. Our standard DN200 Coriolis works up to PN16 continuous. We also offer PN40 flanges for terminals that push 20 bar during pigging operations.
Oil temperature. Bunker oil moves at 50 to 70 °C. The CMF-DN200 is rated from -50 to +200 °C. No derating needed. The sensor electronics sit away from the hot pipe, so zero drift over a 70 °C ramp stays below 0.05 percent.
Viscosity. We calibrate the meter on water. Then
Approvals. ATEX/IECEx Ex d ia IIC T4 for Zone 1. MID MI-005 and OIML R117-1 optional. Many terminals in the Persian Gulf request the tamper-evident MID version for commercial billing.
Mounting a 12-Inch Coriolis Without Zero Drift
Most engineers skip the support brackets and then call us about unstable zero. A DN200 Coriolis weighs as much as a small motorcycle engine. It needs rigid pipe supports within 1 metre of each flange. In practice, we see the best results when the meter sits in a frame that blocks pipe movement from flexible loading hoses. A terminal in Durban installed two CMF-DN200 units on cantilevered pipe racks. Three months later, zero drifted 0.3 kg/min. We added a simple support saddle under each flange. Zero returned to factory spec in one minute.
Keep the flow tubes oriented downward if water slugs are possible. Run the cable tray at least 300 mm away from variable-frequency pump drives. The meter does not need long straight pipe runs. Silver Instruments recommends 3 D upstream and 2 D downstream only to leave room for cleaning pigs. The sensor ships with a factory calibration certificate to ISO/IEC 17025. We pre-configure span, zero, and baud rate for your fuel type. You unbox it, bolt it, wire 24 V DC, and start measuring.
FAQ: Bunker Oil Flow Meter DN200
Can a single DN200 meter handle heavy fuel oil and marine gas oil?
Yes. The Coriolis principle works with density from 0.3 to 3.0 g/cm³. The meter detects the fuel switch within 50 milliseconds using the live density output. No recalibration is needed. A terminal in Fujairah uses one CMF-DN200 to load IFO 180, VLSFO, and MGO through the same arm.
What if the loading pressure drops below 5 bar?
Mass accuracy stays within spec down to 1 bar gauge. The real limit is vaporisation. Heavy fuel oil at 70 °C has a very low vapor pressure, so even 2 bar is safe. Just make sure the back pressure stays above the bubble point.
Do you supply a custody transfer grade version?
We do. The CMF-DN200 MID has OIML R117-1 approval and mechanical sealing. It meets the 0.2 percent mass accuracy required for maritime fuel billing. Bunker terminals in the UAE and Singapore already use it as the official meter for delivery notes.
How do we field verify the DN200 meter?
Zero check takes 90 seconds via the local display or a HART 475. For full verification, we can rent a portable Coriolis master meter. Our partner in Rotterdam also does on-site ISO 17025 calibration. We recommend a yearly verification interval for heavy fuel oil service.
What is the delivery time for an ATEX DN200 meter?
Standard lead time is 4 weeks from our Shanghai workshop. Hastelloy C22 wetted parts add 2 weeks. Express air freight to Jebel Ali or Durban takes about 5 days. We keep one PN16 SS316L unit in stock for urgent replacement orders.
Send us your fuel type, mass flow range in t/h, operating pressure in bar, temperature in °C, and pipe schedule. Our engineers will return a full DN200 quote with a P&ID hookup drawing. Reach us at flow-meter.com.au or email directly. Ask for the bunker oil Coriolis meter model CMF-DN200.
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