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Oil Flow Meter DN400: Ultimate Scale Marine Vessel Bunkering Connection Rules
Quick Answer
For marine bunkering with 16-inch (DN400) lines, a Coriolis mass flow meter gives you mass in kg or tonnes directly. There is no need for density or temperature compensation. Silver Automation Instruments supplies a SIL-CFB series DN400 Coriolis meter that meets ISO 13739 rules and fits standard bunker manifold layouts. It delivers ±0.1 percent mass accuracy even with heavy fuel oil up to 700 cSt.
Why DN400 Bunker Metering Demands More Than Just a Large Pipe
A bunker barge transferring fuel to a VLCC or a container ship often moves 2,500 to 5,000 cubic meters of fuel in a few hours. At this scale, a DN400 pipe is just the entry point. The real challenge is coping with fuel oil viscosity that can swing from 10 cSt for marine gas oil to 380 or 700 cSt for heavy fuel oil. A traditional turbine flowmeter suffers from bearing wear and viscosity drift at these extremes. Here is the thing: most engineers skip the fact that at high viscosities the meter factor can shift by more than 0.5 percent. With a single bunker stem worth over half a million dollars, a 0.5 percent error can create a serious custody transfer dispute in ports like Singapore or Fujairah.
Silver Instruments Coriolis Mass Flow Meter for DN400 Bunker Applications
Silver Automation Instruments builds the SIL-CFB series Coriolis mass flowmeter specifically for large-line bunker custody transfer. The DN400 model handles flow ranges up to 4,000 cubic meters per hour in continuous operation. The wetted material is 316L stainless steel, compatible with HFO, MGO and biofuel blends up to 150 degrees Celsius. The meter body design uses a parallel dual-tube configuration that keeps pressure drop below 0.6 bar at maximum flow. Output options include 4-20 mA HART, Modbus RTU and pulse for batch control. The transmitter housing is ATEX Zone 1 certified, and we factory-configure every unit according to ISO 13739 Annex C guidance.
Bunkering Connection Rules That Affect Your Meter Layout
Practical bunkering connections follow ISO 13739 which explicitly encourages the use of Coriolis mass flow meters. The connection flange for a DN400 meter is typically ASME B16.5 Class 150, but in Asian shipyards we often see JIS B2220 10K. In practice, the meter face-to-face dimension must match the hard-piped manifold spool on the bunker barge. Silver Instruments DN400 meter has a standard face-to-face length of 1,200 mm, which aligns with common manifold designs used by bunker operators in Rotterdam and Singapore. We can also supply custom lengths on request. The upstream and downstream straight pipe requirements are far less strict than those for turbine or ultrasonic meters.
Installation Tips and Practical Considerations
Most engineers skip this part: vibration from ship engines and pump harmonics can induce low-frequency noise into the Coriolis drive signal. We have seen this on customer sites many times. Mount the meter on a rigid steel base and use flexible hoses or expansion joints on both sides. Keep the meter pipes full at all times. Partial filling or slug flow will trigger a diagnostic alarm, and the meter will not give a valid reading. Because the SIL-CFB DN400 weighs around 950 kg, plan your lifting arrangement early. We always include lifting lugs and a zero-shift test report from our Nanjing factory before dispatch. Last year a bunker supply company in Vietnam replaced a bank of positive displacement meters with one DN400 SIL-CFB unit and cut their maintenance downtime from 12 days a year to zero.
Frequently Asked Questions — DN400 Oil Flow Meter for Bunkering
What is the maximum flow rate for a DN400 Coriolis bunker meter? The Silver Instruments SIL-CFB DN400 handles up to 4,000 cubic meters per hour for fuel oils with viscosity from 2 to 700 cSt at standard process conditions.
Does the meter meet OIML R117 custody transfer standards? Yes, we design the meter according to OIML R117 for dynamic measurement of fuel oil, and we provide a type-approval certificate from a notified body where required.
What flange standard is used on the DN400 meter? We supply ASME B16.5 150LB as the default, but we can provide JIS 10K or PN16 to match existing manifold connections on your barge or receiving vessel.
How do you handle high viscosity without affecting accuracy? The Coriolis measuring principle is inherently immune to viscosity changes. There is no mechanical drift or Reynolds number correction needed, unlike with turbine or differential pressure meters.
What is the typical pressure drop at maximum flow? At 3,500 cubic meters per hour of 380 cSt heavy fuel oil, the pressure drop across the meter is approximately 0.5 bar. If you need a lower drop for a specific pump layout, contact our engineers with your flow profile.
Send us your operating data for a firm quote. Tell us your fuel type (HFO, MGO, blend), normal and peak flow rate in cubic meters per hour, pipe size (DN), operating pressure in bar, and temperature in Celsius. Reach Silver Automation Instruments directly at [email protected] or call +86-25-68650347. Message us on WhatsApp +86-25-52155837 or WeChat +86 15365082610. We can prepare a complete dimensional drawing and compliance statement for your classification society within 48 hours.
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