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JapaneseHDPE PIPE Information 2
Production technology
The static calculated of the pipeline resulted in a possible world record wall thickness of 220 mm in a DN / ID 3600 pipe. To meet the requirements of the production technology, the engineering specialists of Krah AG visited the production site at the Community Partner Krah Americana Latina in Tigre, Argentina. The investigation required a modification of the machine and production line in order to handle the enormous wall thickness as well as the resulting weight of about 16 tonnes per pipe. Considerable changes had to be made to reinforce different parts of the manufacturing machine. Some heights of the processing stations needed to be calculated and adapted.
After only 3 months the complete production line in Argentina was upgraded to produce this kind of large pipes and fittings, locally in Buenos Aires at the production facilities of Krah America Latina S.A.
Pipe Production
After all required acceptances for the pipes samples and joints were given; the overall system for the production by the Krah technology was aapproved and sould start. Accordingly, the pipe production could begin.
During the spirally wound pipe production process a total amount of 22 layers (each up to 10 mm thickness) were wrapped around to achieve a wall thickness of about 220 mm per pipe. The used material was delivered by the Brazilian company Braskem. Namely the used material was PE100.
The observed shrinking forces in radial and longitudinal directions resulted in a pipe production with oversizing of the pipe parameters. The shrinking of the first sample pipe pieces in the required dimensions showed that the pipes needed to be manufactured with plus tolerances in length and diameter. A final pipe length of 5.50 m could be realized and adjusted. One important aspect was to produce the pipes with very small tolerances to guarantee a safe and secure jointing later. By using the Krah-winding technology even these kind of heavy solid wall pipes do not have any sagging effects.
Overall, 300 tonnes of PE100 have been used to produce all pipes, fittings and test pieces. On average the pipes were produced with an output of 650 kg/hr. New production lines like KR800, would have an output of 1.000 kg/hr.
article source:
Handbook on large plastic pipe
