Investigation of the length over diameter ratio of tandem pipe by computational fluid dynamics method

Po, Dolly Jim Ming (2019) Investigation of the length over diameter ratio of tandem pipe by computational fluid dynamics method. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The aim of this research was to study the effect of the length over diameter ratio in tandem pipe to the fluid pressure and fluid vortex characteristic. Failure due to vibration was the primary concern in oil and gas plant either in offshore or onshore plant. When vortex was shed, a force was produced and act to the inner pipe wall which can cause a vibration named as Flow-induced vibration (FIV). This study was performed using ANSYS FLUENT. A main pipe (MP) inlet with diameter of 0.7112m and two branch pipes which were Remote Controlled Valve (RCV) and Automatically Controlled Valve (ASV) with diameter of 0.6069m were used as parameter. Fluid with the speed of 30m/s were flowed from MP to inlet elbow, then pass through RCV continues with ASV then meet outlet elbow. Valve at both RCV and ASV were assumed fully closed. The initial case of study of the length over diameter ratio was 2. Modification will apply to the length of the pipe where the ratio become 2.5 and ratio 3. According to the result obtained, it was found that tandem branches can cause velocity and pressure drag. Besides, vortex mainly shed at the bending corner and tandem branches mouth. The vorticity increase when increasing the distance between branches. The velocity and dynamic pressure increase as the length over diameter ratio increase.

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