At all levels of micro-irrigation system, determine the diameter of the stainless steel pipe fittings and pipe section is one of the main task of the hydraulic calculation. Micro-irrigation system of capillary only 10 mm in diameter, and 12 mm, 15 mm, 20 mm, 25 mm to wait for a few kinds, in can choose directly based on the experience in the design of micro-irrigation system. Stem, the diameter of the pipe section should be calculated according to by the flow section O flow relations with stainless steel pipe section size is:
The flow velocity is related to only one flow is not sure of the diameter of the. Therefore, in the design of micro-irrigation stainless steel pipe system, the velocity of choice is one of the important problems of stainless steel pipe fittings design.
Stainless steel pipe fittings mainly affects two aspects, the design of the velocity is one if the velocity is too large, water and wear resistance of stainless steel pipe head loss is big, in the process of operation will increase energy consumption. If the velocity is very large, in the open and closed the gate and all of a sudden stop of pipeline system is easy to occur pipeline water hammer, direct damage caused by water hammer pressure on pipes. In order to prevent the pipe network middle damage caused by water hammer, the velocity of the maximum limit has certain limits. Second, if the flow rate is too low, in order to deliver a certain flow of water, you need a larger water section size stainless steel pipe fittings, pipe network construction investment increase, so the stainless steel pipe fittings and not too small. Only from the aspects of technology, the maximum and minimum value of the velocity of change between the range is very big, but the pipe diameter determination involves the two aspects of technology and economy, therefore, also should consider from the economy of stainless steel pipe fittings design flow rate.
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