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Oil Flow Meter 100 bar: Specialized Equipment Rules for Hydro-Testing Rigs
Quick Answer: For oil flow measurement at 100 bar on hydro-testing rigs, oval gear positive displacement meters are the most reliable solution. They deliver volumetric accuracy even when oil viscosity and temperature shift during a pressurization cycle. Silver Instruments supplies 100 bar rated oval gear flow meters factory calibrated for hydraulic oils, with pulse or 4-20 mA HART output as standard.
What Makes 100 Bar Oil Measurement Different
Hydro-testing rigs use hydraulic oil to pressurize valves, wellhead components, heat exchangers and pipe spools. A typical test cycle pushes pressure to 100 bar and holds it while operators monitor for leaks. The fluid is rarely a thin calibration oil. We see heavy ISO VG 46 or ISO VG 68 hydraulic oils on job sites in Vietnam, Thailand and Saudi Arabia. Their viscosity can swing from 110 cSt at 20 °C down to 22 cSt at 60 °C. A turbine meter or a standard vortex meter will drift with these changes. An oval gear meter does not. Because it traps fixed volumes between the gears, the output is a direct mechanical count of displaced oil. No Reynolds number corrections. No straight run requirements. Just clean, repeatable volume readings you can trust for test reports.
Oval Gear Meter Rules for 100 Bar Hydro Rigs
Not every oval gear meter handles 100 bar safely. Here is what we tell rig builders to check before purchase.
Body material and seal selection. Operating pressure at 100 bar demands a solid housing. We recommend ductile iron or 316L stainless steel bodies for burst protection. FKM (Viton) seals are fine for mineral hydraulic oils. If your rig uses fire resistant phosphate ester fluids, switch to EPDM seals. A paint manufacturer in Malaysia once ordered a cast iron meter with NBR seals and had swell within a week. One small detail changes the service life.
Bearing and gear design. High pressure puts axial load on the gears. Silver Instruments oval gear meters use tungsten carbide journal bearings and matched gear pairs with tight clearances. This keeps the meter linear from 2 L/h on a DN15 size up to 600 L/min on DN50. The measuring chamber remains full throughout the stroke, so trapped air pockets do not falsify the test volume.
Pressure drop management. At 100 bar, a meter with poorly sized ports creates an extra pressure drop that can mask a small leak in the test piece. We size the meter so the pressure loss stays below 0.3 bar at maximum flow. This keeps the hydro rig pump curve stable and the test result valid. Always share your full flow range, not just the nominal point.
Temperature compensation with PT100. Oil thermal expansion adds error if you only read pulse counts. Built in PT100 temperature sensors feed real time oil temperature to the PLC or a Silver Instruments paperless recorder. The system then applies a volumetric correction to reference temperature, normally 15 °C or 20 °C. This matters a lot when a rig in Dubai starts at 50 °C ambient and then heats up further during the 30 minute hold period.
Signal Output and Rig Integration
Most hydro test rig PLCs accept a frequency pulse from the meter. We prewire our oval gear meters with a dual channel open collector pulse output, 0 to 5 kHz range. One channel gives raw volume, the second channel indicates flow direction. This is useful when the rig runs a fill and drain cycle. For sites that want 4-20 mA HART with totalizer, we install a local mount transmitter. The transmitter runs on 24 V DC loop power and maps flow rate across the 4-20 mA span. We have supplied this configuration to a drilling equipment service center in Port Harcourt, Nige
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Site Conditions That Destroy Meters
A 100 bar rating on the nameplate means nothing if the meter sees solids. Hydro test oil picks up metal chips, welding slag and pipe scale, especially during commissioning of new manifolds. We make it a rule: install a Y or basket strainer directly upstream. Mesh size 60 or finer for small bore DN15 to DN25 meters. Also, never let a test rig siphon oil back through the meter at high speed when depressurizing. A fast reverse surge can snap the gear shaft. We often add a check valve bypass loop to protect the meter during blow-down.
How a Southeast Asia Rig Builder Solved Repeatability Issues
A hydraulic cylinder test bench operator in Ho Chi Minh City contacted us twelve months ago. They used a turbine meter with 100 bar rating on paper. However, the weekly calibration check with a master cylinder showed drift of 0.8 percent every ten days. The culprit was viscosity shift from oil heating and gear pump pulse dampening. We replaced the turbine meter with a Silver Instruments OG-S DN20 oval gear meter with PT100 compensation. The site now sees repeatability within 0.15 percent of reading across the full 50 bar to 100 bar test range. No more weekend recalibration calls.
Oil Flow Meter 100 Bar Hydro Testing FAQ
Can I use a Coriolis mass flow meter for hydro test oil at 100 bar?
Yes, if you need mass flow and density data. A Coriolis meter handles 100 bar easily and ignores viscosity. The trade-off is higher upfront cost and a longer lead time. For simple volume verification, a well built oval gear meter is lighter, cheaper and easier to clean.
What is the minimum flow my meter must read accurately?
Hydro test pumps often start at a few liters per hour during low pressure fill. Choose a meter with a turndown ratio of at least 100:1. Our DN15 oval gear meter measures down to 2 L/h at 60 cP, which covers most ISO 46 and ISO 68 oils.
Do I need ATEX certification for a hydro rig oil meter?
It depends on your zone. If the rig is indoors with good ventilation, standard IP67 meters are enough. In a Zone 1 area because of nearby gas sources, you will need an ATEX or IECEx certified meter. Silver Instruments supplies ATEX II 2G Ex db IIC T6 Gb oval gear meters for these sites.
How often should I recalibrate a 100 bar oval gear meter?
We recommend a bench check once a year or after 500,000 liters, whichever comes first. Mechanical wear from contaminated oil shortens the interval. Many customers send the meter to our service center or do an onsite master meter comparison with water, but only if the meter seals are compatible.
Which pipe size fits a typical 100 bar hydro rig?
Most small to medium rigs run DN15, DN20 or DN25 process connections. Larger valve test benches handling 6 inch API 6A gate valves often move up to DN40 or DN50. Measure the port size on your intensifier pump first; the meter connection should match it exactly to avoid cavitation.
Get a Quotation for Your 100 Bar Oil Flow Meter
Every hydro test rig has its own flow profile, oil type and pressure envelope. Send us your pressure (bar), oil viscosity in cSt, pipe size (DN), flow range and signal output preference. Our applications team will prepare a complete dimensioned drawing and price sheet within 4 working hours. Reach Silver Automation Instruments directly.
Email: [email protected]
Tel: +86-135-1213-1526
WhatsApp: 86-135-12131526
WeChat: +86 13512131526
You can also visit our product pages at flow-meter.com.au to see 100 bar oval gear meter curves and exploded parts drawings.
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