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Caldon Ultrasonic Flow Meter: Sourcing Custody Transfer Petroleum Infrastructure
Quick Answer
For custody transfer petroleum lines, a Caldon ultrasonic flow meter or an equivalent meter must meet API MPMS Chapter 5.8, ISO 17089, and the local metering regulation. Buyers should specify line size, pressure class, product viscosity, temperature range, and uncertainty budget before requesting a quote. Silver Automation Instruments supplies ultrasonic flow meters for these applications and provides a technical review within 24 hours.
Why Caldon Ultrasonic Meters Appear in Custody Transfer Projects
Caldon ultrasonic meters are often installed on crude oil, refined product, and liquefied petroleum gas lines. The meters use wetted ultrasonic transducers. That design can deliver high repeatability on large pipelines above DN150. Many custody transfer systems in the Middle East and Latin America run them in parallel with a prover or master meter.
We have seen this on customer sites many times. A custody meter is not just a sensor. It includes flow computer, pressure and temperature transmitters, and a sampling system. The meter body is one part of a bigger fiscal package.
What to Check Before You Source a Caldon Ultrasonic Flow Meter
First confirm the fluid and operating window. Crude oil at 38°C and 42 bar behaves differently from naphtha at 15°C and 9 bar. Viscosity changes affect Reynolds number and meter performance. Get the product density in kg/m3 and viscosity in cP from the process team.
Then check the line size. Caldon meters are often specified for DN150, DN200, DN250, and DN300 custody transfer runs. Smaller lines below DN100 usually require a different meter type or a reduced bore design.
Most engineers skip this part. Ask for the flow computer protocol. You may need Modbus TCP, Ethernet/IP, or serial RS485. The meter output should include 4-20 mA HART for flow rate and digital totalizers for batch and daily totals.
Pressure, Temperature, and Hazardous Area Requirements
Petroleum infrastructure often sits in ATEX Zone 1 or IECEx Zone 1. The ultrasonic transducers, cable glands, and flow computer enclosures must carry the right certificates. A meter that is approved for Zone 2 will not be accepted in a Zone 1 tank farm or pump station in many countries.
In practice, you should collect the line pressure class first. Class 150, Class 300, and Class 600 are common. Some crude transfer stations in the Middle East use Class 900. A buyer from a fuel terminal in Vietnam last year needed a meter rated for 25 bar operating pressure and 50°C product temperature. The flange rating was Class 300. That detail changed the quote significantly.
Calibration and Proving
Ask for a calibration certificate from an ISO 17025 lab. The certificate should list Reynolds number, line size, product, and flow range. A generic water calibration is not always enough for heavy crude. A buyer in Indonesia once found that a meter calibrated at 20°C water performed differently on 1800 cP heavy crude at 60°C. The meter supplier had to adjust the profile factor.
Before final acceptance, connect the meter to a prover or master meter. Run at least five consecutive passes. Compare repeatability and linearity against the fiscal contract limits. This step catches insta
Silver Instruments Alternative for Caldon Ultrasonic Flow Meter Sourcing
Silver Automation Instruments supplies ultrasonic flow meters for custody transfer and allocation measurement in petroleum infrastructure. The inline models cover DN80 to DN600. Clamp-on models cover DN15 to DN2000 for check metering and leak detection. Both options can output 4-20 mA HART, Modbus RTU, and pulse for flow computers.
If your team wants a Caldon meter replacement or a second source, send us the meter tag number, pipe size, flange standard, process pressure in bar, product temperature in °C, and flow range in kg/h or m3/h. We will match the mechanical and electrical interface.
Typical Parameter and Model Pairing
For a 14 inch crude oil custody transfer line at 38°C, 42 bar, and 900 m3/h, a Silver Automation Instruments inline ultrasonic flow meter with ANSI 300 RF flanges, ATEX Zone 1 transducers, 4-20 mA HART, Modbus RTU, and bi-directional flow totals works as a direct technical review case. The uncertainty target should be written as 0.5 percent of rate or better for allocation service, or 0.15 percent of rate for custody transfer depending on local regulation.
For a 6 inch diesel loading line at 20°C, 10 bar, and 180 m3/h, a clamp-on ultrasonic meter with PT100 inputs and density compensation is often enough for check metering against a positive displacement meter. But for fiscal transfer, you need an inline spool piece and a flow computer matched to API tables.
FAQ: Caldon Ultrasonic Flow Meter Sourcing
Q1. Can Silver Automation Instruments supply a direct replacement for a Caldon ultrasonic flow meter?
Yes. We need the existing meter tag, line size, flange standard, process pressure, temperature, product, and flow range. Our engineers prepare a mounting and wiring comparison before quote.
Q2. What accuracy is accepted for custody transfer petroleum measurement?
Most national metrology rules accept 0.15 to 0.5 percent of rate for liquid ultrasonic meters. The exact value depends on the product, line size, flow range, and whether a prover is used. We size the meter to stay within the linear range.
Q3. Do you supply meters for ATEX Zone 1 petroleum installations?
Yes. We supply ultrasonic flow meters with IECEx and ATEX Zone 1 transducer housings. The flow computer and transmitter options include 4-20 mA HART, pulse, and Modbus.
Q4. What information should a buyer send for a fast quote?
Send us the pipe size in DN, pressure in bar, temperature in °C, flow range in kg/h or m3/h, product density in kg/m3, viscosity in cP, flange standard, and hazardous area classification. A one-line process diagram helps but is not required for the first budget number.
Q5. Can this meter be used on both crude oil and refined products?
Yes. The meter can be configured for crude oil, diesel, gasoline, jet fuel, and light naphtha. Each product requires a different density and viscosity curve in the flow computer.
Contact Silver Automation Instruments for a Caldon ultrasonic flow meter sourcing review. Send your pressure in bar, temperature in °C, pipe size in DN, flow range, and product to Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526.