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High Accuracy Mass Flow Meter: Premium Gas Custody Transfer
Quick Answer: For natural gas, LNG, CNG, hydrogen, and industrial gas custody transfer, a mass flow meter must deliver better than ±0.25% of rate repeatability under real line conditions. Silver Automation Instruments supplies Coriolis mass flow meters that achieve ±0.15% of rate for gases, with OIML R137 and MID MI-002 certification, direct mass output, and no need for external pressure or temperature compensation. Send us your pipe size, gas type, and pressure, and we will recommend a meter that fits your exact custody transfer skid.
Why Direct Mass Measurement Changes the Game for Gas Custody Transfer
Volumetric meters like turbine or rotary meters measure volume and then apply pressure and temperature factors to estimate mass. With natural gas, a small error in those factors can shift the billing number and trigger audit disputes. A Coriolis meter measures mass flow directly. No need to compensate for density, compressibility, or changing gas composition. We have seen this on customer sites many times: a gas distribution company in Thailand replaced six turbine meters with our Coriolis flow meters and settled billing variances that had persisted for two years. The direct mass output matched the pipeline provers every time.
Here is the thing. In custody transfer, you do not want to argue about calculated density or transmitter drift. You want a number that both buyer and seller trust. A Coriolis mass flow meter from Silver Instruments gives you that number in real time. It also supplies density, temperature, and totalized mass via Modbus, HART, or pulse output directly to your flow computer. Standard pulse scaling meets NMI M-10 and OIML R117 requirements for high-integrity pulse trains. No exotic signal converters needed.
What Makes a Mass Flow Meter Premium for Gas Service
Not every Coriolis meter works well on gas. Low density and high velocity can excite tube vibration modes that affect accuracy. Our gas-optimized sensor runs a higher drive gain and uses a stiffened dual tube design to handle gas densities down to 2 kg/m³. Materials are 316L stainless steel with optional Hastelloy C22 for wet sour gas. Secondary containment ratings comply with ASME B31.3 and PED 2014/68/EU. For hazardous areas, we offer ATEX Zone 1 Ex ia IIC T4 or IECEx with flameproof housing. Line sizes go from DN15 to DN200, covering flow rates from 0.5 kg/h to 600,000 kg/h. Pressure ratings reach 100 bar standard and 285 bar on request. Process temperature range is -50 °C to +180 °C. Every meter leaves the factory with a NIST-traceable calibration certificate at three gas-equivalent points.
In practice, many engineers skip this part, but you should not. For custody transfer, you need a meter approved by national metrology institutes. Our Coriolis meters carry OIML R137 class 0.3 and MID MI-002 Annex MI-002 conformity. That covers most jurisdictions across Southeast Asia, Latin America, Africa, and the Middle East. A paint manufacturer in Vietnam needed a MID-certified meter for solvent vapor transfer to meet an EU customer specification. We provided a DN25 Coriolis with 0.15% mass accuracy and MID declaration in two weeks. The meter passed local verification with no adjustments.
An LPG Custody Transfer Upgrade in Indonesia
Last year a customer in Indonesia asked us to replace aging PD meters on their LPG truck loading bays. The existing meters needed monthly correction factors and frequent seal changes. They were losing 0.4% of product per batch, mostly due to vapor phase errors. We installed DN40
Connecting to Your Flow Computer and SCADA
Most custody transfer systems use a flow computer like OMNI, FloBoss, or S600+. Our meters speak the protocols these devices expect. Options include active pulse output (10 kHz max), 4-20 mA HART, RS-485 Modbus RTU, and Ethernet Modbus TCP. Self-diagnostic bits flag two-phase flow, empty tube, and calibration drift. That helps the flow computer decide if the meter is in an alarm state and switch to a backup path. The transmitter itself stores up to 120 days of diagnostic data. For remote gas wells, we can power the meter from a small solar panel with a 24 V DC supply, drawing less than 4 W.
What We Need to Give You a Quote
Here is what works best. Send us your pressure in bar, temperature in °C, pipe size in DN, gas type, and normal and maximum flow rates in kg/h or Sm³/h. Tell us if you need hazardous area certification and which standard you follow (ATEX, IECEx, or NEC). Email [email protected] or call +86-135-1213-1526. You can also reach us on WhatsApp at 86-135-12131526 or WeChat at +86 13512131526. We will propose the exact Coriolis model, flange rating, electronics configuration, and a budgetary price. Most quotations go out within one working day.
Frequently Asked Questions
What accuracy can I expect for hydrogen gas custody transfer?
For dry hydrogen at 20 bar to 700 bar, we guarantee ±0.2% of rate mass accuracy. Very low density below 3 kg/m³ requires a hydrogen-optimized sensor with higher drive power. We provide calibration data with nitrogen or helium simulation if direct hydrogen calibration is not practical on site.
Can the Coriolis meter handle high-pressure natural gas at 200 bar?
Standard models cover up to 100 bar. For 200 bar and above, we supply a high-pressure version with reinforced flanges and a thicker secondary containment shell. Rating can go up to 400 bar for specific line sizes. Just tell us your design pressure and we will confirm the feasible DN range.
Do you provide MID certification for EU or EU-aligned markets?
Yes. Our Coriolis meters can be ordered with MID MI-002 conformity assessment certificate, modules B and D. This satisfies legal metrology requirements in the EU, EEA, and several countries that recognize MID. We also supply national pattern approvals for India, Brazil, and Indonesia on request.
How do you deal with pulsating flow in CNG dispensers?
The transmitter includes a configurable DSP filter and a fast flow response mode. It suppresses compressor-induced pulsation without slowing down the batch cutoff. In one CNG station in Peru, we set the filter to 25 Hz and the meter settled within 100 ms after valve open, delivering repeatable fills within 50 g mass tolerance.
What are maintenance requirements for a gas custody Coriolis meter?
No moving parts, no wear, no seal replacements. The only routine action is an annual zero check under no-flow conditions. The meter can run a zero verification sequence on its own with the process valve closed. If you need a full recalibration, we offer factory service or on-site mobile calibration rigs for larger line sizes. Return intervals of 5 years are common in clean gas service.
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