给水管网中旧管段直径及阻力系数的确定

在测试管段比阻的基础上,提出用几种常用水头损失公式计算旧管段直径、海曾——威廉斯公式中系数C和柯尔勃洛克公式中绝对粗糙度k值的方法.并结合实例进行了计算和验证.结果表明:该方法同时考虑了管径及阻力系数对管网水力计算的影响,使旧管道的计算值更接近实际,因而具有广泛的实用性.

Determination of Diameter and Resistance Coefficients of Old Pipes in Pipe Networks

On the basis of pipe test, a. method of determination of D, C and k values of old pipes by using the usual loss-of-head formula is presented. Checking Computations are also given in this paper. This method takes the variations of both pipe diameter and pipe resistance coefficient into consideration, which makes the computed results of old pipes more practical. The method can be widely applied in engineering.