Project case study
Supply of two fixed clamp-on ultrasonic flowmeters for natural-gas flow measurement on District 9 transmission lines — from technical document approval and procurement from the European manufacturer through third-party inspection, customs clearance, installation on a line in service, commissioning and handover to the operator.
Project overview
District 9 Gas Transmission Operations, based in Sari, runs the gas transmission lines of northern Iran. Sanat Khat va Palayesh (SKP) won the district's public tender for two fixed clamp-on ultrasonic gas flowmeters and carried the scope end to end: preparing the technical documentation for client approval, buying from the manufacturer, importing and clearing the equipment, installing it on the line, commissioning it and handing over a working measuring point.
The engineering value of this project lies in the measurement method. Clamp-on transducers are strapped to the outside of the pipe and never penetrate the pressure boundary, so a new measuring point can be created on a transmission line that is already in service — no hot tap, no metering spool, no shutdown and no vented gas. Here the installation and commissioning were carried out on a line running at roughly 38 bar(a), with flow uninterrupted throughout.
The selected instrument is the FLUXUS G721 built by FLEXIM in Germany, configured for pipe sizes from 10 to 48 inches, gas velocities up to 18 m/s and gas temperatures from 5 to 60 °C, with ATEX/IECEx Zone 1 transducers and a Zone 2 transmitter. That operating envelope is what makes the assembly a district-wide measurement asset rather than a single fixed point: it can be redeployed to other lines as operational needs change.
Project images
Scope of work
Systems and delivery
The system works on the transit-time difference of ultrasonic signals with correlation processing, configured for natural gas on large-diameter transmission lines.
The bulk of the contractual obligation was procurement from the European manufacturer and the complete import chain through to delivery at the client's warehouse.
Installation took place on a line in service, which made site preparation, coordination with the operator and HSE compliance inseparable from the technical work.
Selected technical data
Project records are compiled from SKP's own contract and engineering documentation. Current status and time-sensitive details are shown only where they have been formally confirmed.
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