Dynamic behaviour of direct spring loaded pressure relief valves connected to inlet piping: IV review and recommendations

Hős, Csaba; Champneys, Alan R; Paul, K.; McNeely, M.

doi:10.1016/j.jlp.2017.04.005

Cited by 25 publications

(12 citation statements)

References 50 publications

(103 reference statements)

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“…Once the system pressure decreases below the reseat pressure, the valve tends to closes. The difference between the set pressure and reseating pressure expressed as a percentage of set pressure is the so-called blowdown which is a crucial term in predicting the opening and closing cycles [7,12].…”

Section: Iso Description Of a Safety Valvementioning

confidence: 99%

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An Experimental Study on the Force Coefficient and the Discharge Coefficient of a Safety Valve in Air-water Mixture Flow

Burhani

Hős

2021

Period. Polytech. Mech. Eng.

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Due to the low number of experimental investigations on the sizing of safety valves in multiphase flow, a novel set of measurement data of an air-water mixture is reported. This paper presents an experimental study on three different geometries of safety valves, a poppet valve with jet angle θ = 120°, and two-disc valves with deflection angles θ = 0° and θ = 90°, respectively. Our test rig comprises a pipeline with 42.5 mm inner diameter, spray nozzles to supply the added water quality (water mass fraction) to the pressurized airflow up to 40 % mass fraction and an inlet pressure up to 6.6 bar(g). The time histories of force, valve lift, and pressures were recorded. We present correlation data for the force coefficient and the discharge coefficient. The widely used omega technique for the Homogenous Equilibrium Model (HEM) is employed to predict the theoretical mass flux. The results show that the poppet valve experiences less momentum force and lower mass flow rates compared to disc valves, while the disc valve with deflection angle θ = 90° presents the highest discharged flow rates among the tested geometries. Our most important finding is that up to 60 % relative valve lift and 40 % mass fraction, neither the force nor the discharge coefficient changes significantly compared to the pure-air case. Finally, we propose a new correlation with a single equation for the resultant force and the discharge coefficient as a function of the relative valve lift for all tested water mass fractions.

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Section: Iso Description Of a Safety Valvementioning

confidence: 99%

“…[6][7][8]. The safety valve, which is a single degree of freedom oscillator [9][10][11], shows a high complex dynamical behaviour as mentioned in [12] which demands more investigations and experimental work, notably to define the flow force behavior and the characteristics of discharging in case of emergency scenarios.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Force Coefficient and the Discharge Coefficient of a Safety Valve in Air-water Mixture Flow

Burhani

Hős

2021

Period. Polytech. Mech. Eng.

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“…The aim of such valves is to protect the system from excessive pressure by venting the unnecessary amount of flow if needed. However, sizing of these valves -especially in the case of multi-phase applications -might be challenging both from the static and dynamic point of view [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…A PRV is an example of a single DoF oscillator which is prone to self-excited oscillators [16][17][18] and, if coupled with the fluid dynamics inside the piping system, might result in a surprisingly rich dynamic behavior, see [10] for more details. A significant research effort was devoted to predicting the dynamic behavior of safety valves in case of single-phase flow by applying CFD models or running empirical investigations.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Analysis on the Dynamical Behavior of a Safety Valve in the Case of Two-phase Non-flashing Flow

Burhani

Hős

2020

Period. Polytech. Chem. Eng.

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Pressure Relief Valves (PRVs) are key elements of any hydraulic system in the process industry, especially in chemical plants or hydraulic power transmission systems. Their task is to maintain the system pressure beneath a prescribed maximum pressure and vent the excessive fluid in an emergency scenario. This paper addresses the static and dynamic behavior of a Direct Spring-Operated PRV of conical shape in the presence of two-phase non-flashing flow, that is, water-air mixture. First, experimental results on the force and discharge characteristics of such a valve in a wide range of the air-to-water mass fraction are presented. Our test facility includes a custom-designed PRV with 42.5 mm inlet pipe diameter, an inlet pressure up to 6.6 bar(g) and a maximum lift of 10 mm. Additionally, the empirical results on the static characteristics, notably fluid force on the valve disc and discharge coefficients are reported as a function of the liquid mass fraction and valve lift. In the second part of the paper, we present the development of a Matlab-based simulation tool that is capable of predicting the dynamics and stability of such a valve in the case of two-phase, non-flashing, frozen-mixture flow. Moreover, the effect of system parameters, such as spring stiffness and reservoir capacity are recorded. Finally, we also present results on the stability of the opening and closing the multi-phase flow influence on the stability of the blowdown process.

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“…As for the support hydraulic system, the stiffness characteristics depend heavily on the open and close of the relief valve and the dynamic characteristics of the valve. In fact, the static and dynamic characteristics of the poppet relief valve have a significant influence on the efficiency of the hydraulic system [21,22]. For this purpose, it is necessary to investigate the nonlinear static and dynamic stiffness characteristics of the support hydraulic system while also considering the dynamic characteristics of the relief valve and working conditions.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Static and Dynamic Stiffness Characteristics of Support Hydraulic System of TBM

Tao

Lei

Liu

et al. 2019

Chin. J. Mech. Eng.

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Full-face hard rock tunnel boring machines (TBM) are essential equipment in highway and railway tunnel engineering construction. During the tunneling process, TBM have serious vibrations, which can damage some of its key components. The support system,an important part of TBM, is one path through which vibrational energy from the cutter head is transmitted. To reduce the vibration of support systems of TBM during the excavation process, based on the structural features of the support hydraulic system, a nonlinear dynamical model of support hydraulic systems of TBM is established. The influences of the component structure parameters and operating conditions parameters on the stiffness characteristics of the support hydraulic system are analyzed. The analysis results indicate that the static stiffness of the support hydraulic system consists of an increase stage, stable stage and decrease stage. The static stiffness value increases with an increase in the clearances. The pre-compression length of the spring in the relief valve affects the range of the stable stage of the static stiffness, and it does not affect the static stiffness value. The dynamic stiffness of the support hydraulic system consists of a U-shape and reverse U-shape. The bottom value of the U-shape increases with the amplitude and frequency of the external force acting on the cylinder body, however, the top value of the reverse U-shape remains constant. This study instructs how to design the support hydraulic system of TBM.

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Dynamic behaviour of direct spring loaded pressure relief valves connected to inlet piping: IV review and recommendations

Cited by 25 publications

References 50 publications

An Experimental Study on the Force Coefficient and the Discharge Coefficient of a Safety Valve in Air-water Mixture Flow

An Experimental Study on the Force Coefficient and the Discharge Coefficient of a Safety Valve in Air-water Mixture Flow

An Experimental and Numerical Analysis on the Dynamical Behavior of a Safety Valve in the Case of Two-phase Non-flashing Flow

Nonlinear Static and Dynamic Stiffness Characteristics of Support Hydraulic System of TBM

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