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1 Inch Crude Oil Flow Meter with High-Pressure Rating Enclosures
Quick Answer: For a 1-inch crude oil flow meter with a high-pressure enclosure, Silver Instruments supplies oval gear flow meters housed in ATEX/IECEx Ex d bodies rated to PN100. These positive displacement meters handle viscous crude up to 1000 cP and output 4-20 mA HART without needing straight pipe runs. The combination is certified for Zone 1 oil field gathering stations, FPSO modules and road tanker loading skids.
Why Oval Gear Meters Win on Crude Oil Lines
Crude oil viscosity changes a lot. A light condensate can flow like diesel. A heavy waxy crude from Venezuela or Sumatra moves like cold honey. An oval gear flow meter does not care about viscosity shifts. It traps a fixed volume of liquid between two precision oval rotors and counts the rotations. The output is a direct volumetric flow. No need to apply Reynolds number corrections or guess fluid properties.
Here is the thing. We see many engineers initially try turbine or electromagnetic meters on crude. Turbine meters drift when viscosity spikes. Mag meters fail if crude has even a thin internal coating that acts as an insulator. Oval gear meters keep running. We shipped 36 units last year to a gathering station in Angola where crude viscosity varies from 80 cP to 600 cP inside a single batch. The meters recorded totalized volumes within 0.5% repeatability on every truck loading cycle.
High-Pressure Enclosures Built for Dangerous Zones
A 1-inch crude oil flow meter often sits right at the wellhead or on a custody transfer skid. The pipe pressure can hit 100 bar (1440 psi) easily. The standard aluminum flow meter body is strong enough, but the transmitter electronics need a flameproof enclosure. Silver Instruments provides Ex d IIC T6 housings with a hydrostatic test certificate. The enclosure bolts directly onto the meter body and holds the preamplifier or the 4-20 mA transmitter board.
We offer two enclosure materials. Cast aluminum with a gray epoxy paint is the most common. It handles offshore salt spray when you add an IP66/IP67 breather plug. 316L stainless steel enclosures are available for refineries where corrosion from H2S vapor is a worry. Both types are ATEX and IECEx certified. The certification plate includes the II 2 G Ex db IIC T6 Gb marking, so the meter fits Zone 1 and Zone 2 crude handling areas without extra approvals.
Real Field Setup: 1 Inch DN25 Meter on a Custody Transfer T-joint
Most customers mount the 1-inch meter between two block valves and an upstream strainer. Because crude can carry sand and paraffin lumps. We recommend a Y-type strainer with 40 mesh directly before the meter inlet. The oval gear meter itself has 1-inch NPT or BSPP female threads. Operating temperature range is minus 20 degrees Celsius to 120 degrees Celsius. The high-pressure enclosure keeps the electronics safe even when the pipe surface temperature nears 100 degrees Celsius.
Last year a customer in Vietnam replaced a failing Coriolis meter on a coastal tanker loading arm with our 1-inch PN100 oval gear unit. The Coriolis meter had persistent slug flow errors. The oval gear meter, with its positive displacement principle, stopped the billing disputes. The control room gets 4-20 mA HART and a Modbus RS485 pulse output for totalization. No special straight pipe upstream or downstream required. This saved more than 1.2 meters of space on a very tight dock
Output Signals and Control System Integration
Every high-pressure crude oil flow meter from Silver Instruments ships with a loop-powered 4-20 mA HART transmitter fitted inside the flameproof enclosure. The HART signal lets you read instantaneous flow rate, total flow, and diagnostic flags remotely. For sites that still use pulse outputs, we fit a reed switch or a NAMUR proximity sensor that gives a frequency proportional to flow. The electronics are sealed away from the crude and are fully accessible with the enclosure lid open only after a gas test.
Most engineers skip this part during commissioning. The HART communicator must be connected in the safe area or with an ATEX-approved barrier if you open the enclosure in Zone 1. We pre-wire the transmitter and set the 4 mA and 20 mA points to your flow range in the factory. Typical span for a 1-inch crude oil meter is 0.6 cubic meters per hour to 6 cubic meters per hour. Send us your pressure, temperature, pipe size and flow range so we pre-configure the calibrations. You just bolt the meter in and power the loop.
Frequently Asked Questions
Q: What is the maximum pressure rating for a 1-inch crude oil flow meter enclosure?
A: The standard enclosure is rated to PN100 (about 1440 psi at ambient temperature). For higher pressures we can supply PN160 or ANSI 900# body options with the same Ex d housing. The electronics enclosure itself does not see the line pressure, but its integrity is part of the overall explosion protection.
Q: Can the meter handle waxy crude with paraffin above 15 percent?
A: Yes, if you keep the crude above the wax appearance temperature. The oval gear rotors are hardened stainless steel with a small clearance. We advise steam tracing or electric heat tracing on the meter body and strainer. The high-pressure enclosure remains unaffected by the heat tracing. Do not insulate over the flameproof lid.
Q: Is the oval gear flow meter suitable for custody transfer of crude oil?
A: Many national oil companies accept oval gear meters with a OIML R117 or MID approval for crude allocation measurement. Our 1-inch meter achieves 0.5% accuracy of reading across a 10:1 turndown. Pair it with a certified prover loop and you have a complete crude custody transfer system.
Q: How often must the strainer be cleaned in a crude oil application?
A: This depends on your well. A customer in Oman cleans the strainer every 72 hours during the first month of production because of sand. After the well stabilizes, cleaning drops to once every two weeks. We suggest installing a differential pressure gauge across the strainer so you get a visible warning when blockage starts.
Q: Does Silver Instruments provide local support for installation and Ex inspections?
A: We have distribution partners in Southeast Asia, the Middle East, West Africa and Latin America. They can handle the flameproof gland terminations and the initial loop checks. Send us your site location and we connect you with a trained partner who understands the ATEX/IECEx requirements for crude oil areas.
Send us your pressure (bar), temperature (degrees C), pipe size (DN) and required flow range. Our engineers will reply with a recommended 1-inch crude oil flow meter model, a detailed datasheet and a price. Just visit our contact page and mention the crude oil enclosure specification. No generic calls needed.
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