Rehabilitation of pipes with a non-circular cross-section
Mar 28, 2006
HOBAS NC Line - for pipes with a non-circular cross-section HOBAS NC Line are glass-reinforced polyester (GRhttp://www.unitracc.de/aktuelles/artikel/rehabilitation-of-pipes-with-a-non-circular-cross-section-en#fieldsetlegend-datesP) pipes manufactured using the filament winding process and designed for construction or rehabilitation of non-circular sewers. The special pipes can be made to fit inside the old sewer for rehabilitation or in virtually any shape required for new installations. HOBAS NC Line Pipes are consisting of polyester resin, quartz sand and glass.
shaped pipes with both circular and noncircular cross-sections up to a diameter of 4000 mm (Figure 1).
During the winding process, all the NC Line Pipes are also fitted with a sleeve coupling at one end, which has an elastomeric sealing gasket to DIN 4060. After this process is completed, the spigot is milled. An adhesive joint is also available for special applications (Figure 2).
Abrasion performance was tested using the Darmstadt method. The pipes show high abrasion resistance over their entire service life.
The jetting resistance was analyzed by Siebert Engineering Consultants in Oststeinbeck (report of August 22, 1989 available on request).
Different pipe shapes and wall thicknesses can be supplied and are selected to cater for the load cases involved. Design and manufacture of the NC Line thus meets a wide range of customer specifications.
The HOBAS NC Line Pipes are calculated taking the shape and installation conditions into account. Structural analysis takes into consideration the specifications and recommendations of the DWA code M 127 for rehabilitation and DWA A 127 for new installations. Tests are carried out by accredited third parties and building sites supervised by authorized experts or RAL quality association members.
Advantages
- Custom shaped
- Various lengths
- Different joint options
- Full load-bearing capacity
- Proven jetting resistance
- High hydraulic capacity
- Certified abrasion resistance
- Rapid construction progress
- No corrosion
- Installation possible in all weathers
- Combinable with all Hobas pipe ranges
- Convenient to work with
- Short-term elastic modulus:11.000 N/mm2
- Long-term elastic modulus:6.875 N/mm2
- Short-term flexural strength:150 N/mm2
- Long-term flexural strength:94 N/mm2
- Abrasion after 200,000 load cycles:0.07 mm
During 2003 contacts were established with one of the most important companies nationwide for water management, SMAT. This company is in charge of the sewer and water pipelines and purification plants and their choices are often taken as a kind of guideline by the other companies in the region.
The original idea of the relining sleeve was abandoned and the first 136 m of NC Line DN 614/1064 were ordered. The pipes have been delivered at the end of June 2004 and installed by a local contractor. Having no experience with these kind of pipes, the contractor was quite sceptical but was finally convinced of the HOBAS Pipe Systems. Additionally, Hobas provided the trolley required to transport the new pipes into the old pipeline (Figure 4).
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Contact
HOBAS Rohre GmbH, Neubrandenburg (G)Uwe Kreitel
17034 NeubrandenburgGermany
Phone:
+49 (0) 395 45 28 150
Fax:
+49 (0) 395 4528100