T/CWEC 12-2019 The testing method for the length of drip irrigation tubing (hose) installation

Scope

Main technical content: When irrigation water flows along the drip irrigation pipe (tape), energy is consumed to overcome frictional resistance, resulting in a loss of water head. The pressure at the downstream end of the drip irrigation pipe (tape) decreases as the laying length increases. During the design and operation of drip irrigation projects, the relative deviation of the pressure at the drip heads at the beginning and end of the drip irrigation pipe (tape) or the relative deviation of the drip head flow rate are often used as control indicators. When the relative deviation of the pressure at the drip heads at the beginning and end of the drip irrigation pipe (tape) is used as a control condition for the laying length, the laying length of the drip irrigation pipe (tape) can be calculated using the relationship between the laying length and the relative pressure difference upstream and downstream obtained from the standard test. The drip head flow rate is related to the pressure at the drip head inlet by a power function, and this relationship can also be obtained from the standard test. When the relative deviation of the drip head flow rate at the beginning and end of the drip irrigation pipe (tape) is used as a control condition for the laying length, the relative pressure difference at the beginning and end of the drip irrigation pipe (tape) under this flow rate relative deviation condition can be calculated using the relationship between the drip head flow rate and the pressure at the inlet, and then the laying length of the drip irrigation pipe (tape) can be obtained using the relationship between the laying length and the relative pressure difference upstream and downstream obtained from the standard test

Development Information

Related Standards