Abstract
The influence of the material stress state induced by internal and external forces on the erosion rate of pipelines has rarely been investigated in the literature. In order to fill this gap, using a tensile tester machine, a two–phase gas–solid particles jet erosion test was carried out considering a 316L stainless steel under different tensile stresses and different erosion angles. The results show that: 1) In the elastic range, with the increase of stress, the erosion rate manifests a rising trend; 2) In the metal plastic range, the increase of stress leads to a decrease of the erosion rate; 3) The erosion rate at a small erosion angle is more sensitive to the increment of stress. The present research demonstrates that the combined effect of erosion and material internal stress can contribute to determine the effective resistance of the vulnerable parts of piping systems (such as elbows or similar components).
Highlights
The particle velocity and the incident angle are closely related to the particle movement within the flow
The pattern was divided into two parts, the elastic range (0–200 MPa) in which the erosion rate rapidly increases with impact angles of 30°, 45°, 60°, 75°, and 90°, and the plastic range (300–500 MPa), where the erosion rate decreased slowly for all the impact angles
In the plastic range (300 MPa to 500 MPa), the erosion rate decreased as the stress increased; pipelines used in engineering rarely reach the plastic stage
Summary
In oil and gas gathering and transportation processes, sand particles are contained within the extracted oil and gas mixture. When particles move with the fluid to the elbow, tee, or valve, where the flow direction suddenly changes, their inertia will impact the inner pipe wall and possibly damage it. This process is known as erosion and causes serious safety hazards [1–3]. The main factors affecting the erosion rate are the particle velocity, the incident angle, particle properties, and target martial properties. In current studies on erosion complications, the focus is mainly on the movement of particles within the pipeline, with little focus on the changes in target properties and their influences on the erosion process. Studying the effect of stress on erosion is needed to better understand its implications
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