Current position > News detail
『Oil Flow Meter NMI Approved: Legal-for-Trade Certifications for Australian Metrology』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)
Oil Flow Meter NMI Approved: Legal-for-Trade Certifications for Australian Metrology
Quick Answer: In Australia, any oil flow meter used for buying and selling must have a National Measurement Institute (NMI) pattern approval. Silver Instruments supplies NMI M10 approved Coriolis mass flow meters for custody transfer of crude oil, diesel, and mineral oils. The meters come with full certificates and specific calibration data. Send us your oil type, flow range, pipe size, and pressure. We will return a quote and a copy of the NMI certificate.
Here is the thing. If you bill a customer by the litre or by the kilogram for fuel, lubricant, or crude oil in Australia, your flow meter is a legal instrument. Under the National Measurement Act, the meter must have an NMI pattern approval certificate. Without it, trade is illegal and you can face fines. Many engineers learn this only after an audit.
At Silver Automation Instruments, we have been through the NMI approval process for our Coriolis mass flow meters. The approval covers a family of meters designed for oil custody transfer. We offer the SCM-D series, with sizes from DN15 up to DN200. Each meter is tested and shipped with a calibration certificate traceable to Australian standards. But the key is the pattern approval itself.
What Does NMI Approval Mean for Oil Flow Meters?
NMI stands for National Measurement Institute, the agency that manages trade measurement in Australia. A flow meter gets NMI approval after it passes a series of strict tests defined in NMI M 10 (pattern approval for liquid measuring systems). The tests check accuracy, repeatability, durability, and the effect of temperature and pressure changes. Once a pattern is approved, any meter from that same design can be used for trade if it is calibrated and sealed according to the rules.
For oil applications, the meter often works with viscous fluids, high flow rates, and variable temperatures. So the NMI tests push the meter with mineral oil at different viscosities and flow rates. The approval confirms the meter meets the maximum permissible errors set by the Australian trade regulations. For most oil transactions, that means an accuracy within plus or minus 0.5 percent of the actual volume or mass.
Our SCM-D Coriolis mass flow meter was put through these tests by an independent NMI appointed laboratory. It passed for a flow range of 1 to 50 kg/s, nominal diameter DN25 to DN150, and fluid temperatures from minus 20 up to 180 degrees Celsius. The pattern approval number is listed on the certificate you can download from our website.
Why Coriolis Mass Flow Meters for Oil Trade
Most oil trade in Australia still uses volumetric meters with temperature compensation. But here is the reality: density changes. A litre of diesel at 15 degrees Celsius is not the same mass as a litre at 40 degrees. Coriolis meters measure mass directly, which is immune to density shifts. So you get a true mass reading no matter the temperature. That is why major oil terminals have been switching to Coriolis meters with NMI approval.
Silver Instruments Coriolis meters also deliver very high accuracy, typically plus or minus 0.1 percent of rate, and repeatability down to 0.05 percent. They have no moving parts, so maintenance is low even with dirty fuels. The tubes are made of stainless steel 316L, with options for Hastelloy for aggressive crude oils. Pressure ratings go up to PN100 (100 bar), and the meter handles process temperatures up to 200 degrees Celsius.
On the customer side, we have seen a fuel depot in Western Australia replace three positive displacement meters with a single SCM-D DN80 Coriolis meter. They cut calibration costs by half because the Coriolis meter holds its calibration over time. The NMI inspector was happy. They now use it for diesel, biodiesel, and heating oil sales.
Practical Installation and Verification
Engineers often ask about inst
Verification after installation is straightforward. The meter leaves our factory with a calibration certificate. But the site needs to be verified by a licensed service company or NMI inspector. The meter electronics have a custody transfer lock switch and a security seal to prevent tampering. All data outputs, 4-20 mA HART, pulse, and Modbus RTU, are available. The pulse output is often used for a remote totaliser in the control room.
Case Studies and Specific Countries
A biodiesel producer in Queensland contacted us last year. They export to Asia and needed a flow meter accepted by both Australian and Vietnamese authorities. We provided the NMI pattern approval certificate and the Vietnamese metrology authority accepted it as an equivalent for their local verification. The customer uses two SCM-D DN40 meters to measure B100 biodiesel loaded onto tank trucks.
In another case, a Singapore based ship chandler supplies lubricating oil to vessels in Darwin port. They required an NMI approved flow meter for bunker delivery. We supplied an SCM-D DN25 with a pulse output and a local display. The meter was verified on site by an NMI appointed verifier. The chandler now has a legal trade system that satisfies the port authority.
How to Order an NMI Approved Oil Flow Meter
Do not just ask for a price list. The right configuration depends on your oil viscosity, flow range, pipe connection, and output needs. Send us these details:
Required parameters: type of oil (crude, diesel, lube, etc.), kinematic viscosity in cSt at operating temperature, flow range in kg/h or litres per minute, pipe size DN, maximum working pressure in bar, process temperature in degrees Celsius, and required output signals. Also mention if you need the meter supplied with a pre verification service or just the factory calibration.
We will reply with a model recommendation, a technical data sheet, the NMI pattern approval certificate, and a quote. For Australian customers, we can arrange local service partners for verification. For Southeast Asian buyers, we can supply the same meter without NMI approval if your country accepts factory calibration and OIML certificates.
FAQ: Oil Flow Meter NMI Approval
1. Is NMI M 10 approval mandatory for all oil flow meters in Australia? Yes, if the meter is used for trade or sale of oil products by volume or mass. Meters used for internal transfer or process control do not require NMI approval.
2. Can I use a Coriolis meter with NMI approval for diesel and petrol? Yes. The SCM-D series is approved for hydrocarbons from light petrol to heavy fuel oil. The pattern covers a wide viscosity range.
3. How long does it take to get an NMI approved meter delivered? From order to delivery, standard meters take 3 to 4 weeks. Custom configurations may take 6 weeks. The NMI approval is already in place, so no extra wait.
4. What happens if the meter loses calibration? Coriolis meters are stable. But if you suspect a shift, you must have the meter re verified by a licensed service company. Silver Instruments can provide guidance and spare parts.
5. Do you provide meters with ATEX or IECEx for hazardous oil zones? Yes. We can supply NMI approved meters with ATEX Zone 1 or Zone 2 certification for use in coal seam gas or oil vapour areas. Specify the zone requirement when ordering.
Get in touch with your parameters. We will help you pick the correct NMI approved oil flow meter.