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DIN EN 641:1994
Reinforced concrete pressure pipes, cylinder type, including joints and fittings
The document specifies the requirements of concrete pressure pipe cylinder type, that is not prestressed, in sizes from DN/ID 250 to DN/ID 4000 inclusive. Pretensioned concrete cylinder pipe, in which the reinforcement is wrapped under low tension, directly on to the steel cylinder is covered by this document and is not normally manufactured in sizes above DN/ID 1400.
Deutsches Institut für Normung [din]