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API MPMS Oil Flow Meter: Complying with Manual of Petroleum Measurement Standards
Quick Answer: Silver Automation Instruments supplies oil flow meters that meet API MPMS Chapter 5 for custody transfer of crude oil, refined products, and LPG. Our Coriolis mass flow meters deliver traceable accuracy within ±0.1 percent and ship with ISO 17025 calibration certificates. This removes the guesswork when your loading terminal faces an inspector or customs audit.
Why API MPMS Compliance Matters for Your Oil Measurement
A 0.2 percent error on a 50,000 barrel crude parcel does not sound big until you see the invoice. Oil depots from Batam to Lagos and Jebel Ali settle on API MPMS standards every day. API MPMS Chapter 5 sets the rules for meter selection, installation, and calibration for liquid hydrocarbons. Silver Instruments designs Coriolis, oval gear, and turbine flow meters against API 5.6, API 5.2, and API 5.8. You do not receive a generic meter with a hope-it-passes vibe. Each unit arrives with a meter factor report, material certificates, and a calibration run log that directly references the relevant API MPMS clause. In practice this means you can schedule a third-party witness test the same week and pass.
Coriolis Mass Flow Meters and API 5.6: Straight to Mass
A Coriolis meter measures mass directly. It ignores density changes, temperature swings, and viscosity shifts that mess with turbine factors. A typical Silver Instruments DN50 Coriolis for crude oil covers 0 to 36,000 kg/h, handles a viscosity of 150 cP at 40 °C, and reports density online at 0.5 kg/m3 resolution. The wetted parts are 316L stainless steel with Hastelloy C22 as an option. This matters when you unload light Angolan crude one day and heavy Basrah the next. Because the meter meets API 5.6, the calibration proves linearity across 5:1 turndown without popping a separate K-factor for each product. The output is a standard 4-20 mA HART loop, a Modbus RTU register, and a high-frequency pulse for a portable prover. ATEX Zone 1 and IECEx approvals are included. Most engineers skip the zero check, but we have seen on sites that a 30-second zero verification before a batch run stops a 50 kg drift before it becomes a stock loss.
When Oval Gear Meters Fit Thick Crudes and API 5.8
Coriolis excels, but heavy crudes above 500 cP often need a positive displacement meter. A Silver Instruments oval gear flow meter with PTFE gears runs hot residual fuel oil at 90 °C and 2,000 cP without slipping. It aligns with API MPMS 5.8 for viscous hydrocarbons. We supply these meters from DN10 up to DN150 with NIST-traceable pulse resolution. A paint resin plant in Selangor switched to our oval gear meter and cut their mass balance error from 1.2 percent to 0.2 percent just by eliminating slip flow. The meter uses reed switch or Hall sensor pulse output, and its body is cast steel with a 40 bar rating. Because the gears sweep the measuring chamber, entrained solids pass without jamming. Tell us your maximum solid particle size and we check the clearance gap before you order.
Real Projects, Real Numbers for Custody Transfer
A fuel terminal on the Mekong Delta replaced four aging PD meters with two DN80 Silver Instruments Coriolis meters in 2024. Their product line is diesel and gasoline at 28 °C ambient. Before the swap the facility recorded an avera
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Start Your Meter Sizing Without Guesswork
Every oil flow meter project has a few hard numbers you already know. Send those to us: fluid name or group, minimum and maximum flow rate in kg/h or barrels per day, operating pressure in bar, process temperature in °C, pipe size in DN, and whether you need ATEX Zone 1 or Div 2. We return a selection with the specific model, accuracy curve, pressure drop estimate, and a fixed price. Our application engineers also check the API MPMS chapter that fits your operation so the calibration scope matches your contract requirements. Visit flow-meter.com.au to see the full range of custody transfer meters and request a detailed quote.
Frequently Asked Questions
Q: Can I use a turbine meter for API MPMS custody transfer instead of Coriolis?
A: Yes, turbine meters fall under API MPMS 5.2. They work well for clean, low-viscosity products like jet fuel or gasoline. A Silver Instruments turbine meter with dual pulse output and 0.15 percent linearity fits midstream pipeline applications. For crude lines where viscosity shifts daily, a Coriolis meter under API 5.6 gives more stable meter factors and less proving effort.
Q: What proving data do you supply with the meter?
A: We deliver a 10-point ISO 17025 calibration certificate that states K-factor (pulses/kg), linearity error, repeatability, and expanded uncertainty. The certificate labels the test standard as per API MPMS 5.6 or 5.2, which customs and tax authorities in Asia and Africa accept as proof of accuracy.
Q: Does Silver Instruments help with high-viscosity crude without a heat trace?
A: Our oval gear meters handle up to 100,000 cP with no heat jacket. For Coriolis meters, if your crude viscosity at operating temperature stays below 1,000 cP, you do not need a heater. We can also supply meters with integrated PT100 and a steam-jacketed housing. That helps when you pump heavy waxy crude in winter.
Q: Which Ex certifications do your oil flow meters carry?
A: All our custody transfer meters come with ATEX Zone 1 or Zone 2, IECEx, and North American cCSAus approvals. We can also provide PESO for the Indian market and EAC for the Russian pipeline sector. The certification packet ships inside the meter box.
Q: How fast can I receive an API MPMS flow meter?
A: Standard Coriolis meters up to DN100 ship from stock in 5 working days. Larger sizes or Hastelloy wetted parts take 4 to 6 weeks. Oval gear and turbine meters typically ship in 3 to 5 weeks. Our service team also offers on-site commissioning and meter proving assistance for terminals in Southeast Asia and the Middle East.