Papers by Keyword: Pipe Vibration

Abstract: Vibration based technique have so far been focused on the identification of structural damage. However, not many studies have been conducted on the corrosion identification on pipes. The objective of this paper is to identify corrosion on pipes from vibration measurements. A hollow pipe, 500 mm in length with 63.5 mm in diameter was subjected to impact loading using an impact hammer to identify the natural frequency of the tube in two conditions i) without any corrosion and ii) with an induced localized 40 mm by 40 mm corrosion at the middle of the pipe. The shift of natural frequencies of the structures under free boundary conditions was examined for each node of excitation. The results showed that there is a shift in natural frequency of the pipe, between 3 and 4 Hz near to the corrosion area. It can suggested that that the impact vibration is capable of identifying of localized corrosion on a hollow tube.

Abstract: This paper provides a method to eliminate pipe vibration on swirlmeter. We made an experimental research on a diameter 50 mm swirlmeter to study the influence that pipe vibration on the swirlmeter. Results show that using difference method can eliminate the error caused by pipe vibration by putting two sensors along the same side of the swirlmeters axis and using difference method. The experiment proved the approach using difference method to calculate the measured data feasible.

Abstract: In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, then the fixed relationship between standard deviation of pipe wall’s vibration induced by fully developed turbulence and mean flow rate is determined, by the abundant experimental data analysis,The vibration frequency characteristic of the pipe’s vibration signals is found in the experimental system.and fluid flow is measured non-intrusively, the study is conducted on vibration induced by turbulent flow when fluid flow through pipe.

Abstract: Circular pipes are widely used to convey goods to a desired location. Flow inside a pipe needs to be smoothed and unobstructed to ensure an optimize flow of particle. However, pipes are prone to clogging or blocking due to deposition of unwanted impurities and external objects. Built up inside a circular pipe will affect the flow velocity and pressure within the pipe. This paper presents a method of assessing blockage inside a pipe by using vibration analysis. The effect of blockage was observed through changes in pipe vibration response and also turbulence intensity. The changes in vibration parameters were identified together with the reduction of flow area due to increasing blockage size.

Abstract: In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed, then the fixed relationship between standard deviation of pipe wall’s vibration induced by fully developed turbulence and mean flow rate is determined.The advantage of this method is applicable to small flow measurement with non-intrusively.

Abstract: Fluid-solid coupling dynamic characteristics analysis of vertical cantilever lifting pipe in transporting coarse solid particles was conducted by adopting ADINA. Firstly, finite element models of pipe and fluid were built, which was solved by using ADINA/FSI module. Secondly dynamic characteristics of pipe vibration for different run-time, constrain conditions, volume concentration and transporting velocities were studied. Thirdly the stress and displacement characteristics were discussed under above conditions. The results were shown that stress and displacement will increase with transporting concentration and velocity rising; the shorter run-up time is, the bigger stress and displacement will be; stress and displacement of lifting pipe supportive anchor in weak constrain were greater than that in fixed connect condition. Analysis results have certain directive significance in future structure design, check, reducing vibration study for lifting pipeline in the ocean mining.

Abstract: Following the adequate model of the reciprocating compressor piping system and the compressor design parameters, operating conditions and gas parameters, the mechanical system of compressor piping, gas-column system, pressure pulsations and of vibration response are numerically simulated. And the main factor bringing to the compressor piping system vibration is identified. A reasonable way to controlling piping vibration is developed to achieve a better efficiency. Keywords: Compressor; Pipe vibration; Vibration Analysis; numerical simulation.

Abstract: Abstract. Above all, it is discussed about vibration mechanism of the pipe system in a chemical ship, according to layout feature of pipes, the finite element model of the pipe system is constructed by means of CAESARⅡ software, through analyzing internal characteristics of pipes, exciting force and valves of dynamic responses are deduced, displacement responses are tested after the pipe system is applied by exciting force, damping projects of pipes are put forward to after measuring results are compared with calculation results.

Abstract: The pipe vibration’s mathematical model is established with help of the finite element impedance method, through the beam element simulating the pipeline structure, a finite element model of pipe system is constructed by means of CAESAR Ⅱ software, the vibration simulation and field testing is carried on in the abnormal vibration pipe joints, hangers and other parts, the simulation results and the field test results are compared, and then putting forward the damping project of the hydrogenation piping, the project is used in damping improving of the original hydrogenation piping, vibration test results indicate that the damping effect is obvious in the improved pipe joints, hangers supporting structure.

Abstract: Above all, it is discussed about vibration mechanism of the pipe system being filled with liquid ammonia in a chemical ship, the mathematic equations of pipe vibration are deduced, and finite element model of the pipe system is constructed by means of CAESARⅡ software, then according to constructed model, vibration emulating of the pipe system is done with the help of MATLAB software, and field measuring of vibration is also done in the connection and elbow of the pipe system, dynamic damping project is put forward after the results of emulating are compared with measuring values of vibration in a chemical ship, original pipe system being filled with liquid ammonia is improved on the basis of the dynamic damping project, in the end, vibration values of improved pipe system are tested and analyzed again, the results of testing indicate that adopted dynamic damping project is feasible.