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Register a new userThe Effect Of Using Gas Accumulator With One Way Surge Tanks On Protecting Delivery Pipes Line From Water Hammer
تأثير استخدام خزان الهواء المضغوط مع خزانات التغذية في الحماية من الصدمة المائية في خط الضخ
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ياسمين أحمد زيود( باحث )
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نظرا لأهمية الصدمة المائية و لتأثيرها الكبير في أنابيب الضخ تم إجراء دراسة تحليلية للصدمة المائية الناتجة عن توقف محطة الضخ بشكل مفاجئ عن العمل (نتيجة انقطاع التيار الكهربائي) على خط جر مياه ينقل المياه من خزان أرضي سفلي مفتوح إلى ثلاثة خزانات علوية مفتوحة و ذلك بدون وسائل حماية من الصدمة المائية، و تم تحديد قيم الضغوط العظمى و الدنيا و موقع كل منها في الشبكة ، و تبين أنه ينتج عن توقف المضخات بشكل مفاجئ صدمة مائية تؤدي إلى حدوث التكيف في معظم أجزاء الشبكة و ان الضغوط العظمى أصغر من ضغط تشغيل الأنبوب .
Because of the importance of water hummer and it’s big impact in pumping pipes, an analytical study of water hummer resulting from the pumping station abruptly stopped working (due to a power outage on water pipe line that conveys water from ground open tank to three overhead open tanks was conducted, and without means of protection from water hummer . maximum and minimum pressure values and the location of each of them in the network have been identified. It was found that the pump trip caused a transient state with negative pressure along the pipe system. The values of maximum pressure were less than the pressure tube run.
References used
M ,R.Chamani & S.Pourshahabi&F.Sheikholeslam , 2012.Fuzzy genetic algorithm approach for optimization of surge tanks .Isfahan university ,Iran
Watters , G.Z ,1979.Modern ANALYSIS and control of unsteady flow in pipe line ,Ann Arbor Sience , Ann Arbor , ML
Wylie , E.B V,L.Streeter L .Suo,1993.Fluid Transients in systems.Prentice Hall,Englewood Hill, New JERCY
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Analysis study was done to explain the effect of the
longitudinal section on the values of pressure of the water
hammer resulting from the trip of pumps, which results a low
pressure wave often lead to get cavitation, has been shown from
the anal
ytical study of several profiles and compare the results,
that the shape of the profile and the level of the pressure line
after the stopping of pumps determines the type of cavitation
formed , the region in which it occurs and the pressure values
resulting from it, when the profile doesn’t contain bends or the
bends are below the level of line pressure a distributed
cavitation is occurred, In the case of the presence of high points
, the effect of the bend is linked to several factors:
1 - the greater the height of the bend above line pressure increases the possibility for column separation and increases the pressure
forces.
2 –the pressure forces increase whenever the bend closer to the pumps.
An analytical study was done to explain the
relationship between the performance of gas accumulator, surge
tank and vacuum breaker valve and the profile of the pipe.
The study proved that effectiveness of protection means vary
according to the longitudinal path of pipe.
The objective of the study was to determine experimentally
the dust pollution of polyethylene pipe during head- to - head
welding in the workshops piping and its impact on the efficiency of
welding.
The objective of the research is to identify the optimal date of
planting when mutual intercropping (line: line) is used in planting
beans Phaseolus vulgaris L. and sweet corn Zea mays rugose L.
Cultivars of Medicago Sativa l.var local were planted in three locations, ten
pots per location. The first location wich is the most polluted one is (Bab
Toma), second polluted one is (Jeser Victoria), and the reference location is
(Daria), in the
west of Damascus.
Temperature, relative humidity and concentrations of main pollutants in
that three locations were measured.
Resultes showed that air pollution decreased growth of plants, amount of
chlorophyll, production of plants, number of flowers, number of pods and leaf
area in comparison with reference location.
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