Technology and devices for liquid pressure pipeline interventions in livestock farms

This technology is used when performing interventions on pipelines through which fluid under pressure is conveyed, in order to extend new networks, or branches, repair damage to pipes, install heat measuring systems, meter water consumption for billing, without interruption of utilities to consumers connected upstream of the point of intervention. Implementing the new technology is based on two devices: tight drilling-cutting device for the pressure pipeline and clogging device of the pressure pipeline. Both devices are successively mounted on a base block, whose boss is welded on the top generator of the pressure pipes, at the point of intervention. Currently, interventions on liquid pressure pipes, regardless their purpose, involve closure of the tower at the nearest point where there are isolation gates, hard to handle or broken, sometimes located in inaccessible places. The technology of intervention presented may be applied on under pressure pipe networks being in static or dynamic operational mode for operational pressures of max. 6 bar and standard nominal diameters of 65, 80, 100, 125, 150 and 200 mm. After performing tests was chosen the obturator with constant thickness of the wall for its constructive simplicity in the conditions in which the operational requirements are fulfilled. The tests demonstrated that the obturator accomplishes its role of interrupting water flow through the pipe in dynamic operational mode at 6 bar, if the pressure from inside it has a value of 10 bar. Application of this new technology has a direct effect on quality of life, allowing elimination of interruptions in drinking water supply utilities, domestic hot water or heat

Injector of primary solutions with hydraulic control

The injector within the structure of the equipment usable for fertigation of horticultural crops, developed under the PNII-PT-PCCA-2013-4-0114-FERTIRIG project, Financial Agreement no. 158 /2014, is the type double diaphragm pump, compact design, its body embedding both the hydraulically controlled directional valve, which controls the change in the direction of motion of the mobile assembly with membranes, and the valves for intake/ discharge of primary solution. The injection device uses irrigation water as the working (driving) fluid; this water is taken from the same pipeline in which the primary solution (that in a mixture with the irrigation water forms the fertilizing solution) is injected, which provides autonomy in operation of the fertigation equipment in any spot of the irrigation enclosure. The overpressure needed to perform injection is achieved on the principle of difference between the active surfaces of driving chambers and injection chambers. The injector shall be installed in bypass against the pipeline which supplies the drip or micro sprinklers irrigation plant, with which it forms a working assembly. The pump working pressure is 2.5…3 bar, and it is limited to such values by the pressure allowable in the irrigation water distribution network. Laboratory tests have highlighted that for the previously defined pressure range, at flow rates of the irrigation plant of 10.5...13.5 l/min, the device achieves injection flow rates of 2.5...3 l/min, at frequencies of the mobile assembly of 90...110 double strokes/min. Tests on the fertigation equipment, in real operating conditions, will be conducted at the premises of project partners USAMV Iasi and ICDP Pitesti Maracineni

The most important high floods in prut river’s middle course-causes and consequences

Hydrological risks phenomena on Prut River’s middle course are a consequence of the global climate change or variations at the regional and planetary level and secondly, the human intervention in the specific landscape. Statistical analysis focused on the maximum flows recorded at Radauti – Prut, Stanca-Aval, respectively at Ungheni emphasized the multiannual maximum flow variability during 1978 – 2012. The analysis of monthly maximum flows indicates spacial differences caused by local conditions and climatic characteristics of the periods in which they occurred. For the Prut River, the highest flow recorded in the period 1978 – 2012 was 4240 m³ /s at Radauti – Prut in July 2008, as a result of heavy rainfall which fell in Ukraine. The spacial location of the Stanca – Costesti reservoir on the middle course of the Prut river outlined a downward trend of the flows recorded at the hydrometric stations located downstream, due to the mitigating role. Upstream is highlighted a clear upward trend,knowing that the flood peak from 2008 exceeded the flow with the probability of 1 %. Floods study is an important aspect, also the infrastructure monitoring of water resources because they are unevenly distributed and equipped in the middle course. It is necessary to ensure the consistency between quantitative and qualitative management policies applied in Romania, Moldova and Ukraine. Anthropogenic intervention in the Prut river basin triggered negative reactions, and these major imbalances made the floods to emerge stronger