Prior to commencing drilling, 18 metre pipe lengths were assembled at the exit point of the HDD. These 18m sections consisted of three 6 metre sections (known as triplets). The “triplet” sections are then placed on a launch system which is aligned in both horizontal and vertical planes to the HDD exit point. As the 18m section is drawn back into the drilled hole the next section is moved into position on the launch system and joined using two special connecting rings. The main advantage of this technique is that lengthy trace alignment becomes irrelevant.
Viseer & Smit Hanab utalised its 100 ton drilling rig to complete the 195m drilling into which the cast iron pipeline was pulled through.
In addition to the drilling, Visser & Smit Hanab was also responsible for tie-in works from the newly installed line into the existing water lines on both sides of the canel.
Despite having to work to a tight schedule, the project was successfully completed thanks to effective cooperation between the various departments within Visser & Smit Hanab and the local authorities in Veendam.