Water Journal : Water Journal February 2015
FEBRUARY 2015 water 41 Spotlight on St Gobain Where specialist sewerage fittings are required, ISO/EN598 outside diameter components are available, including saddle branches, swivel branches, angle branches, joints, connection sleeves, manhole connections, access hatches, cleaning tees, inspection covers, cleaning chambers and manholes. Pipe-joining technology is another area of significant development for SGP. Today’s ductile iron joints are a far cry from the bolted gland joint of 1860. A case in point is the 2015 UNIVERSAL Ve joint. This joint incorporates a sealing chamber, a locking chamber, a locking segment and a spigot with an anchoring weld bead. These components are integrated in the assembled joint to effect tensile anchorage and a restrained joint. The sealing chamber accommodates the EPDM elastomeric sealing ring, while the locking chamber accommodates the circular locking segment, which bears against the circumferential weld bead as the spigot is pushed out of the joint. The locking segment wedges against the locking chamber and the weld bead catches on the locking segment, preventing the spigot from being dislodged. This joint has the advantage of mechanical restraint while maintaining a high pressure where required. By anchoring the joints using the UNIVERSAL joint, a restrained joint pipeline can be established and all the associated benefits obtained, such as elimination of anchor blocks, slip-lining, horizontal directional drilling (HDD) and pipe cracking. The latter applications have recently been made more practicable, with coating systems that not only protect the pipe from aggressive environments, but that are also robust enough to withstand the abrasion associated with the drawthrough. Coatings such as coextruded polyethylene, solventless 2-pack polyurethane and fibre cement-coated pipes are all systems suited to HDD as well as pipe bursting and pulling into a sleeve. Note that these techniques reduce environmental damage, reduce accidents, reduce economic risk, reduce pollution and do not interfere with traffic or interrupt services. Pipeline designers and practitioners can expect more new ductile iron technologies and products from Saint-Gobain PAM as 2015 unfolds and the market continues to embrace innovation in water infrastructure systems. HDD (TRENCHLESS) CASE STUDY: STP PROJECT OF SHANXI YAOGUANG COAL POWER COMPANY, PINGYAO COUNTY, SHANXI PROVINCE, CHINA In 2013, Saint-Gobain PAM China provided materials for a pipeline for the sewage treatment plant (STP) project of the Shanxi Yaoguang Coal Power Company. The pipeline was built to transport the water after wastewater treatment from the STP to the power plant for industrial use. The geographical environment of this project was complex: • The level drop between the STP and the power plant was around 200m; and • The location of the project had a varied topography. This meant the operation pressure of the pipeline was high. Saint-Gobain PAM China provided pipe and anchored gasket for the project. As Pingyao County is a tourist city, excavation was not allowed in certain areas, so Saint-Gobain PAM China decided to apply trenchless technology to three sections of the total pipeline. The first section of the pipeline was 78m long, the second was 102m and the third was 564m. The pipeline needed to go through the lake of a park. 564 meters – the length of the third section in Pingyao project – set a record for the longest pipeline in a trenchless project in the domestic market. The project earned high praise and laid a good foundation for Saint-Gobain PAM’s development in trenchless projects. For more information please contact Hilton Terry, Marketing Manager, 0419 005 570. See www.saint-gobain-pam.co.uk. Authorised distributors Australia and New Zealand: PWS Water Systems Pty Ltd. Easily handled, easily transported, DN750 PN35 HYDROCLASS Zinalium pipes.
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