Hydraulic calculation of pipes is performed to select the optimum diameter at which, loss of pressure (friction of water against the walls of pipes) will be optimal and economically viable. Losses per 1 meter of pipes, depending on the material, are accepted 80 - 250 Pa / m or 8 - 25 mm of water column. The water velocity in the pipes, depending on the diameter, should be within a certain range. The maximum The value of the water velocity for heating systems is 1.5 m / s. Recommended limit values ??for water speed in pipelines for internal diameter: 15 mm - 0.3 m / s, 20 mm - 0.65 m / s, 25 mm - 0.8 m / s, 32 mm - 1 m /
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