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HDPE high-density polyethylene reinforced spiral B-type pipe
Due to the smooth inner wall surface of HDPE pipes, the roughness coefficient n=0.009. When calculating the flow rate using the Manning formula, under the same pipe diameter conditions, its flow rate is 30% larger than that of reinforced concrete pipes. This means that when transporting the same amount of sewage, the diameter of HDPE pipes can be reduced by 1 to 2 pipe grades compared to reinforced concrete pipes.
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