Industries and residential households on the west of Padma River are going to get their much coveted gas connections soon following the installation of a 30-inch pipeline through the river.
China Petroleum Pipeline Bureau (CPPB), a Chinese state-owned company, successfully completed the installation of the 30-inch high pressure natural gas pipeline across Padma River on July 13.
The project is being implemented by Bangladesh's state-owned Gas Transmission Company limited (GTCL).
“The project was technically demanding as over 100 years ago at the time of Hardinge Bridge construction, a British company dumped rock boulders under the riverbank to prevent it from being destroyed by river flow,” a GTCL official told the Dhaka Tribune yesterday.
These rock boulders eventually sank ten meters under the riverbed over time, causing the previous contractor to fail twice during the execution of reaming pass, said the GTCL official
Originally, the government planned to construct the 30-inch diameter 1,000 PSIG (70.3kg/cm3) gas pipeline from Hatikumrul to Bheramara, in order to supply natural gas to consumers as well as power stations located in Kushtia and Pabna.
The project consisted of installing 82km of land pipeline and five river-crossing pipelines by Horizontal Directional Drilling (HDD) method.
Although almost all of the project work had been finished earlier, only the construction of the Padma River-crossing pipeline remained incomplete.
Following the failure of the previous contractor, the GTCL in July 2015 invited an international tender to install the gas line through the mighty Padma.
The CPPB won the bid and started installing the 2.21km pipeline through Padma River.
After signing the contract, CPPB assigned experts to figure out why the former contractor had failed and finally decided to adopt a combined survey method of exploration hole and geophysical prospect, by which the characteristics of the formation of the river bed and the specific boundary of the rock boulders areas were clearly found out.
The CPPB furthermore deepened the bottom profile depth to 70 meters below ground level at exit point and optimised the engineering profile, successfully avoiding the dumped stone zone below the embankment.
The GTCL official said that after the installation of this section of pipeline, the downstream line will be connected to the upstream pipeline which has been under operation for more than four years.
After that, natural gas will be transmitted to the areas located on the west of Padma River.