Line-C is one of the major water transmission system projects successfully accomplished in Saudi Arabia by Tekfen.
The purpose of the project was to supply potable water from Al Jubail Desalination Plant to Riyadh High Point Terminal.
Line-C Pipeline Project was one of the 4 phases constituting the Water Supply System; Tekfen’s responsibility covered construction of 60” x 375 km pipeline, pump stations and an underground reservoir system.
The project consists of 375 km, 60” diameter steel pipeline system with 4 pumping stations, a delivery terminal and a storage reservoir system of 6 x 60.000 m3 underground concrete tanks. Line pipe materials are API X-52 and X-60 with wall thicknesses ranging between 14,27 mm and 17,48 mm. Interior of the pipeline is lined with 14 - 16 mm cement mortar layer and exterior is coated with 6 mm polyethylene.
Design flow rate of the pipeline system is 4,4 m3 / sec, which gives and average daily throughput of 380.000 m3.
Water has to be pumped from the Desalination Plant, located at sea level, to 700 m elevation at Riyadh High Point Terminal. For this purpose 4 pump stations are used, each delivering in the range of 40 to 55 bars dynamic pressure with 20 - 30 MW installed capacity.
Operation of the system is designed to be automatically controlled by telemetering with computer back up from the center at Al Jubail.
Tekfen has also performed the following tasks:
• Hydraulic design verification of the pipeline system,
• Pipeline strength calculations and verification of pipe wall thickness distribution,
• Optimisation of route and right-of-way,
• Preparation of all pipeline construction drawings,
• Detailed design of all crossings,
• Detailed design of Cathodic Protection System,
• Preparation and implementation of the Hydrostatic Test Procedure,
• Preparation of the as-built drawings.
On the route, 28 Aramco Oil Transmission Pipelines have been crossed. Additionally, a twin 60” SWCC A and B lines, brine water line of Sadaf Plant in Jubail Area and twin 40” asbestos-cement water pipelines supplying Riyadh in Wasia Area have been crossed.
Al Jubail - Abu Hadriyah 6 lane expressway, Aramco’s heavy lift roads and several local roads of different sizes have also been crossed along the route.
In the rocky sections towards Riyadh, approximately 20 valleys have been crossed at extra depth and surface erosion protection was applied according to the specifications.
A WORLD RECORD IN PIPELINE CONSTRUCTION
Automatic welding technique was used on all joints (other than tie-ins) and average daily production of one shift has ranged between 40 and 50 welds. On one exceptional day, October 31, 1988, front-end welding crew completed 130 joints (60” / 15,88 mm); project was completed and delivered to the Client as scheduled.