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| Basic Facts | |
|---|---|
| Client: | Hellenic Gas Transmission System Operator S.A. (DESFA) |
| Timeframe: | July 2007 – March 2008 |
| Project location: | Thiva Region, Greece |
| Main services: | • Third party inspection, including witnessing of welding, lowering and backfilling, kathodic protection, hydrotesting, cleaning, calibration, drying, processes • Non-destructive testing • Issuance of final certificate |
| Involved regulations/standards: | • EN 287-1 • EN 15614-1 • EN 10208-2 • API 1104 • Owner’s specifications |
Initial situation and requirements
The Hellenic Gas Transmission System Operator S.A. (DESFA) was established as a subsidiary company of DEPA S.A., the public gas corporation of Greece. The scope of DESFA is to operate, maintain, manage, exploit and develop the National Natural Gas System and its interconnections, ensuring that the system is both financially viable and technically reliable in order to meet customers’ needs as safely and competently as possible. When the DESFA constructed the steel pipe network and polyethylene network for industrial customers, they needed a reliable partner to conduct inspection services of the medium pressure transmission system.
| The National Natural Gas System transports gas from the Greek-Bulgarian border, the Greek-Turkish border and the Revythousa Island in the Gulf of Megara to consumers in continental Greece. |
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About TÜV Rheinland
Founded more than 140 years ago, TÜV Rheinland is a global leader in independent inspection services, ensuring quality and safety for people, the environment, and technology in nearly all aspects of life.
We inspect technical equipment, products and services, oversee projects and help to shape processes for companies around the world. Since 2006, we have been a member of the United Nations Global Compact to promote sustainability and combat corruption.
As a provider of comprehensive inspection services for the oil and gas industry , we can help reduce risk, prevent material defects and ensure maximum safety of plants and pipelines. We support our clients with certification, inspection and testing services and help them meeting their obligations for all applicable standards and regulations.
Solutions, results
Due to its advanced knowledge of inspection services in the oil and gas industry , TÜV Rheinland was the preferred choice for DESFA.
In order to provide the full raft of inspection services DESFA required, we provided a breakdown of the statutory work that had to be undertaken. The inspection was to be conducted along the medium pressure 19 bar transmission system of the steel pipe network and the PE network 4 bar, both of which are part of the Greek Natural Transmission System.
To conduct the statutory third party inspection works, we witnessed the welding, lowering and backfilling processes during construction. As part of post-manufacture inspection works, we conducted non-destructive testing (NDT) , such as ultrasonic testing and radiographic testing , and recorded the process of cathodic protection, stringing, hydrotesting and drying of the pipework.
We were able to provide our full complement of inspection services, thus enabling DESFA to achieve the EN 10204 certification they had aimed for. The competitive nature of our bid did not compromise on quality, reliability or the responsible conduct and performance of our expert services.
Read more about our services for the oil and gas industry
Benefits for the client
With the benefit of TÜV Rheinland’s services, DESFA was able to enjoy:
• On site inspection, conducted during network production, enabling the elimination of delays to project progress and completion.
• Consistent and thorough application of high standards during inspection process.
• Achievement of EN 10204 certification standard.
• Use of reliable and competent technical expertise, including the use of different NDT methods as part of the inspection service provided.