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US-based Nessco has announced that it has won a subcontract to provide telecommunications, radio and security systems for QatarEnergy’s project to add a fifth natural gas liquids (NGL) train at its fractionation complex in Qatar’s Mesaieed Industrial City.

The subcontract was awarded to Houston-headquartered Nessco by India’s Larsen & Toubro Energy Hydrocarbon (LTEH), in its capacity as the main contractor performing engineering, procurement and construction (EPC) works on the NGL-5 project.

MEED reported last September that QatarEnergy had selected a consortium of LTEH and Greece-headquartered Consolidated Contractors Group (CCC) to execute EPC works on the NGL-5 project.

The aim of the project, estimated to be worth $2.5bn, is to build a fifth NGL train with the capacity to process up to 350 million cubic feet a day of rich associated gas from QatarEnergy’s offshore and onshore oil fields.

In a statement confirming its contract award in October last year, LTEH said the scope of work on its contract “encompasses engineering, procurement, construction, installation and commissioning of a natural gas liquids plant and allied facilities for processing rich associated gas (RAG). This also involves all associated utilities and offsites and integration with existing facilities.

“The RAG sourced from offshore and onshore oil fields will be treated at the plant to remove impurities like H2S, CO2 and H2O, producing value-added products such as lean sales gas, ethane, propane, butane and hydrocarbon condensate,” Bombay Stock Exchange-listed L&T said. 

Under the consortium arrangement, LTEH, as the lead partner, will be responsible for engineering and procurement, while CCC will handle construction activities.

Project scope of work

Associated gas from the PS1, PS2 and PS3 offshore fields, as well as the Dukhan onshore field, is processed at existing facilities at the NGL complex in Mesaieed – specifically, the Fahahil stripping plant, NGL-1 and Qapco ethane recovery units.

The planned NGL-5 facility will replace these three units at the Mesaieed complex and process gas from the PS1, PS2 and Dukhan fields.

The scope of work on the project involves EPC of units for the following functions:

• Feed gas compression
• Slug handling
• Gas sweetening
• Dehydration
• Mercury removal
• NGL fractionation
• NGL recovery
• Product treatment
• Propane refrigeration
• Acid gas enrichment
• Sulphur recovery
• Anti-flaring
• Utilities
• Boil-off gas recovery
• Drains and collection networks
• Effluent water treatment plant
• Carbon dioxide treatment and sequestration/export
• Brownfield modifications
• Product rundown pipelines

QatarEnergy intends to start operations at the NGL-5 facility by the second quarter of 2028.