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40 G/H Flow Meter for Liquid Custody Transfer Protocols
Quick Answer: For a 40 G/H liquid custody transfer point, a Coriolis mass flow meter is the only instrument type that delivers direct mass measurement, long term stability, and compliance with API MPMS and OIML R117. Silver Instruments recommends the SIL-CFM series in DN15 size with a 4-20 mA HART output and an active PT100 temperature sensor. This meter achieves a ±0.1% mass flow accuracy under real process conditions and comes with a traceable calibration certificate for your audit chain.
Why a 40 G/H Flow Rate Demands Special Attention
Low flow custody transfer at 40 gallons per hour sits in a tricky spot. Many turbine and positive displacement meters lose accuracy at these rates due to bearing friction or internal leakage. Electromagnetic meters can work but they measure volume only and drift when conductivity drops below 5 µS/cm. In practice, a Coriolis meter ignores all that. It measures mass directly, independent of fluid density, viscosity, or pipe vibration. We have seen this on customer sites many times. A water treatment plant in Thailand swapped an oval gear meter for our SIL-CFM015 and reduced billing disputes by 90 percent because the temperature effect on volume was eliminated.
Protocols and Standards You Must Follow
Custody transfer is a legal transfer of ownership. That means your meter and the whole measurement chain must meet written standards. The key ones for liquid hydrocarbons and chemicals include API MPMS Chapter 5.6 for Coriolis meters, OIML R117 for dynamic measuring systems, and MID MI-005 for Europe bound shipments. In the Middle East and Southeast Asia we often see contracts referencing ISO 10790. A 40 G/H meter used for diesel or solvents will need a test report that shows meter factor linearity across the full turndown range. Silver Instruments ships every custody transfer flow meter with a 10 point calibration certificate tied to a national standard.
Recommended Meter Configuration for 40 G/H
We size the SIL-CFM015 meter body for a nominal flow range of 0 to 50 kg/h. When measuring diesel with a density of around 830 kg/m³, 40 G/H corresponds to roughly 126 kg/h. The meter runs inside the sweet spot of its curve. The wetted parts use 316L stainless steel and the standard process connection is 1/2 inch BSP or NPT. For custody transfer you need a full system. That includes the flow transmitter with 4-20 mA HART, a remote or integral PT100 for density correction, and often a batch controller to trigger shutoff valves. The electronics meet ATEX Zone 1 or Class I Div 2 requirements for oil and gas loading bays.
A Real Site Story from Latin Ame
Last year a lubricant blending plant in Colombia approached us. They were using a turbine meter for a 40 G/H heated base oil line but the meter factor shifted every month because the viscosity changed from 22 cSt to 46 cSt. The plant sent us their pressure (6 bar), temperature (80 °C), pipe size (DN15), and flow range. We installed a SIL-CFM015 with a built in RTD. The meter now reports mass flow in kg/h, calculates volume at 15 °C automatically, and sends data to their paperless recorder. The plant engineer told us the uncertainty dropped from 0.8 percent to 0.14 percent. More important, the audit finding was closed immediately.
How to Get a Quote for a 40 G/H Custody Transfer Meter
Send us your fluid name, density (kg/m³), viscosity (cP), operating pressure and temperature, pipe size (DN), and your target flow range in kg/h or G/H. Also tell us which certificate standard you need. We will return a fixed price with delivery time to your port in Malaysia, Vietnam, UAE, Chile, or Nigeria. Our team tests every meter on a NIST traceable calibration rig before it leaves the factory.
Frequently Asked Questions
Can an electromagnetic flow meter handle 40 G/H custody transfer?
Only if the liquid conductivity is above 5 µS/cm and the contract allows volumetric transfer. Most custody transfer contracts demand mass based measurement, which an electromagnetic meter cannot provide without an external densitometer.
What is the typical turndown ratio for a DN15 Coriolis meter at this flow?
A SIL-CFM015 gives a specified turndown of 20:1. You can measure accurately from 2.5 kg/h up to 50 kg/h, which covers startup and slow pump conditions easily.
Do I need straight pipe runs before the meter?
No. Coriolis meters do not require upstream or downstream straight runs. You can install the meter right after a pump or an elbow, which saves space on a compact skid.
What certificates come with the flow meter?
Every custody transfer shipment includes a factory calibration certificate with 10 measurement points, material certificates to EN 10204 3.1, and a pressure test report. For MID or OIML certified meters we provide the type examination certificate and declaration of conformity.
How do you verify the 40 G/H measurement on site?
Most customers perform a master meter comparison or a gravimetric test using a weigh scale and a stopwatch. The test is simple. Collect the liquid for a known time, weigh it, and compare the totalized mass against the SIL-CFM display. Because the meter has a local display with data logging, you can run this test behind the custody lock and keep the record for your regulator.
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