#Pipenet reamer manuals
Based on the knowledge of the RELAP5 code manuals and some relative documents, the authors utilize RELAP5 to set up an example of water-supply system via an impeller pump to simulate the phenomena of the pump-stopping water hammer. The purpose of this article is to introduce the RELAP5 to the simulation and analysis of water hammer situations. If this happens and when the pressure exceeds the critical pressure that the pipe or the fittings along the pipeline can burden, it will result in the failure of the whole pipeline integrity. Generally water hammer can occur in any thermal-hydraulic systems and it is extremely dangerous for the system when the pressure surges become considerably high. The fast deceleration of the liquid results in high pressure surges, thus the kinetic energy is transformed into the potential energy, which leads to the temporary pressure increase. However, as development continued, the code was expanded to include many of the transient scenarios that might occur in thermal-hydraulic systems. RELAP5 was originally designed to analyze complex thermal-hydraulic interactions that occur during either postulated large or small loss-of-coolant accidents in PWRs. Pump-stopping water hammer simulation based on RELAP5 In this paper, by using two case examples, vibration phenomena transmitted to each part are analyzed, on the basis of water pressure fluctuation and pressure wave propagation due to occurrence of water hammer oscillation.
#Pipenet reamer tv
In case a gate installed at the end of discharge conduit is vibrating during discharge, or an air valve is vibrating during water-filling operation into the conduit pipe between main gate and auxiliary gate, and vibration period tv is larger than tc ( water hammer propagation time) that is equivalent to the phenomenon of slow closure, there is a possibility that water hammer oscillation in the discharge conduit could be induced. Kurata, Kouichi Sasaki, Katsuhito Makihata, Toshiaki
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WATER HAMMER OSCILLATIONS IN THE IRRIGATION FACILITIES
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Finally we will show that the second water-hammer peak can reach pressures a lot higher than the first peak by additive interference of the primary and secondary water-hammer wave. We found a beat phenomenon which is likely to be the so called Poisson-coupling beat. The configurations feature a coiled pipe setup with a support structure and without a support structure. To enhance the understanding of water-hammer, we investigated different configurations and their influence on the wave shape in the frequency domain. Test benches used to conduct tests on future as well as current engines are also sensitive to water-hammer waves traveling along their feedlines. Here the priming of feedlines during start-up of an engine as well as the rapid closing of valves upon shutdown may lead to pressure peaks symptomatic of a water-hammer wave.
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Water-hammer phenomena are of strong interest in a number of different industrial fields, amongst which the space industry. Influences on water-hammer wave shape: an experimental study