| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2008: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
This dissertation presents a series of studies conducted for investigating applicability of automatic control valves to guarantee the safety in field-irrigation pipelines The final goal of the studies is to achieve a pressure reduction on field irrigation pipelines using automatic control valves. For the purpose, the studies focused on the following two main objectives ; (1) in natural down-flow pipelines, establish a pressure control technique by applying automatic control valve and safety valve, and (2) in pumping pipelines, investigate for water column separation and establish a technique of controlling water hummer pressure by applying check valve. These techniques contribute to reduce maximum pressure in the pipeline and thus enable a safe use of low-cost polyvinyl-chloride pipes for field irrigation pipelines. Also, it allows to construct pumping pipeline system without having conventional facilities for negative pressure measures.
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