Water Hammer Phenomenon in Pipeline with Inserted Flexible Tube

Kubrak, Michał; Kodura, Apoloniusz

doi:10.1061/(asce)hy.1943-7900.0001673

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…This can be performed by inserting a flexible tube into the pipeline [22], installing additional highly-deformable pipes in a pumping system, adding an in-line polymeric short section, branched penstock or by combining these techniques. Kubrak and Kodura [23] used a flexible gas-inflated tube inserted into the steel pipeline to control unsteady pressure oscillations. The experimental and numerical study performed by Pezzinga and Scandura [24] and Pezzinga [25] revealed that the ability of the additional polymeric pipe to dampen pressure waves depends mainly on the ratio between the volume of the device and that of the network system.…”

Section: Introductionmentioning

confidence: 99%

Water Hammer Control Using Additional Branched HDPE Pipe

et al. 2021

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In pressurised pipeline systems, various water hammer events commonly occur. This phenomenon can cause extensive damage or even lead to a failure of the pumping system. The aim of this work is to experimentally re-examine the possibility of using an additional polymeric pipe, installed at the downstream end of the main pipeline, to control water hammer. A previous study on this topic investigated additional polymeric pipes connected to the hydraulic system with a short joint section of the same diameter as the main pipeline. In the current research, a different method of including an additional pipe was considered which involved connecting it with a pipe of a smaller diameter than the main pipeline. Three additional HDPE pipes, with different volumes, were investigated. The performance of the devices was studied for hydraulic transients induced by both rapid and slow, manual valve closures. Experimental results show that the additional polymeric pipe can provide significant pressure surge damping during rapid water hammer events. As the valve closing time lengthens, the influence of the additional pipe on the maximum pressure increase is reduced. The additional HDPE pipe does not provide notable protection against hydraulic transients induced by slow valve closure in terms of reducing the first pressure peak. No relationship between the volume of the additional pipe and the damping properties was noticed. The observed pressure oscillations were used to evaluate a one-dimensional numerical model, in which an additional pipe is described as a lumped parameter of the system. The viscoelastic properties of the device were included using the one element Kelvin–Voigt model. Transient flow equations were solved with the implicit method of characteristics. Calculation results demonstrate that this approach allows one to reasonably reproduce unsteady flow oscillations registered during experiments in terms of the maximum pressure increase and pressure wave oscillation period.

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Section: Introductionmentioning

confidence: 99%

Water Hammer Control Using Additional Branched HDPE Pipe

et al. 2021

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“…Eq. 2.4 shows that the lower the elastic modulus of the hose and the larger its diameter in relation to the inner diameter of the pipeline, the greater is its ability to reduce the pressure wave velocity [11]. According to the well-known Joukowsky equation, the maximum pressure increase is proportional to the pressure wave velocity.…”

Section: Unsteady Pipe Flowmentioning

confidence: 99%

“…Some PVC sections used in their experiments collapsed and some of the aluminium tubes were deformed. In a more recent study, Kubrak and Kodura [11] used an inner air-inflated silicone rubber tube to attenuate pressure waves in a steel pipeline. Although the internal tube provided a significant damping of water hammer, it was reported that the strength of the internal tubes used in experiments restricts their practical application, as they tend to collapse and lose their ability to reduce transient pressure waves.…”

Section: Introductionmentioning

confidence: 99%

Water hammer mitigation by internal rubber hose

Kubrak

2024

Archives of Civil Engineering

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The aim of this research was to experimentally analyse the possibility of using a rubber hose placed inside a pipeline to mitigate the water hammer phenomenon. The experiments were conducted using a steel pipeline with an inner diameter of 53 mm and an EPDM rubber hose with a diameter of 6 mm. Hydraulic transients were induced by a rapid closure of the valve located at the downstream end of the pipeline system. In order to analyse the influence of steady-state flow conditions on the maximum pressure increase, measurements were carried out for different values of initial pressure and discharge. The experimental results indicate that placing a rubber hose inside a pipeline can substantially attenuate valve-induced pressure oscillations. It was observed that the initial pressure has a significant influence on the capacity of the rubber hose to dampen the water hammer phenomenon. Comparative numerical calculations were performed using the Brunone–Vitkovský instant acceleration-based model of unsteady friction. It was demonstrated that this approach does not allow satisfactory reproduction of the observed pressure oscillations due to the viscoelastic properties of the EPDM hose used in the tests.

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“…Even so, works exploring piping systems' energy transfer, dissipation, and distribution in viscoelastic systems are not standard. In fact, most research in which the dissipative nature of viscoelastic materials is examined regards the study of techniques to limit liquid pressure amplitudes and pipe displacements with the inclusion of additional viscoelastic pipes and/or viscoelastic supports in the piping systems (Tijsseling and Vardy, 1996;Zanganeh et al, 2015;Triki, 2018;Hosseini et al, 2020;Kubrak and Kodura, 2018;Kubrak et al, 2021). Nevertheless, these works did not employ an energy analysis to aid in the investigation of the efficiency of these techniques.…”

Section: Introductionmentioning

confidence: 99%