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PTT’s YADANA GAS PIPELINE IN THAILAND

1. The Contractor and Building Time

In January 1997, the Tasco Mannesmann Joint Venture (TMJV a Thai-German Company Joint Venture), won PTT's pipeline contract which included the procurement, construction and commissioning of the pipeline and related facilities, as well as the design of the Supervisory Control and Data Acquisition (SCADA) and Telecommunications system including a Fiber optic cable system. The Yadana Gas Pipeline in Thailand was built in the years of 1997–1998.

2. Design, Detail Engineering and Route selection

PTT was responsible to provide the entire engineering (except for SCADA) including the detailed engineering for the pipeline project. For this work Nova Gas International and OGP Technical Services of Malaysia[2] won a consulting engineering and project management contract for the Yadana Gas pipeline in November 1995. According to the reference document Nova Gas/OGP was responsible for the route selection, the detailed engineering of the pipeline and all related facilities including issuing the Bid documents. With issuing the Tender documents for Bidding to Contractors the engineering was not finished and it was completed only during the execution phase of the project incorporating all the changes ordered by PTT. The design life for the pipeline is 40 years which is consistent with PTT's other pipeline systems. Furthermore, as PTT's Engineer and Consultant Nova Gas/OGP was responsible for the entire construction supervision of the Yadana Gas Pipeline Project.

3. The Pipeline System

The pipeline has a diameter of 42 inch and is around 240-kilometer-long and it has a total number of 12 Block Valve Stations that includes 6 Scraper Facilities, an operations and maintenance center including a gas meter station and a SCADA Telecommunications system that was connected to the Petroleum Authority of Thailand's (PTT) existing SCADA system. After it's completion the Yadana Gas Pipeline secured PTT with an alternative source of gas supply form Myanmar in addition to the Gulf of Thailand, on which PTT had totally relied upon.

4. Starting & Ending Location of the Pipeline

The Yadana gas pipeline system connects with the 36 inch Yadana Myanmar gas pipeline at Ban-I-Tong a small former mining village located in a forest mountain area, on the border in Kanchanaburi in the Province of Thong Pha Phum at KP-000[4]. At Scraper/Block Valve Station 1 located 350 meter away from the border the pipeline increases its diameter to 42 inch. It than transports the gas to the Ratchaburi Power Plant located at the end of the 240 km long pipeline. PTT’s Operation and Maintenance Center is located at Pipeline Kilometer KP 233.2 at Ratchaburi adjacent to Highway 4.Scraper/Block Valve Station #7 including the later built Compressor Station is the home for the Region VIII Gas Pipeline Operations Division Kanchanaburi.

5. Terrain of the Pipeline

The pipeline routes through a widely differing types of terrain such as along roads, through paddy fields, sugar cane fields etc. and mountainous areas. The basic right of way for the pipeline, varying in width from 5 meters in road reserves to 10 meters in privately-owned areas, and 12 to 20 meters in forestry areas, was provided by PTT, as was the land for the construction of other facilities.

6. Construction

TMJV used - as planned at the beginning of the Project - two main pipeline construction-spreads. Both spreads were sufficient equipped and have had mechanized welding crews. The mobilization of the imported construction equipment, local equipment and manpower was achieved as planned. Later in the project TMJV expanded the number of construction Spreads due to delays that occurred by mainly land unavailability. The accelerated recovery measures that were implemented by the TMJV worked successfully and most of the lost time was recovered and the anticipated Project delay was significantly minimized.

7. The Gas is used for many purposes in Thailand The gas as it transported by the 42 inch Yadana Gas Pipeline is used for many purposes in Thailand and is a part of PTT's Gas Value Chain. According to PTT the Yadana Gas Pipeline is a highly sophisticated technical system and complies to the Thailand Quality Award (TQA) criterion. PTT did win a TQA award in 2010! The Yadana Gas Pipeline deliveries about 25% of Thailand’s Natural Gas demand. It should be noted that Thailand's total power generation is dominated by 58% of natural gas according to the referenced Bangkok Post Article dated on 31. March 2020.

8. Pipeline Anniversary

September 2020 marked the 22nd. anniversary of the Petroleum Authority of Thailand (PTT) 42-inch Natural Yadana Gas Pipeline operation from Ban I Tong to Ratchaburi. Since this time no operation pipeline accident was reported.