The cracking analysis of refined oil pipeline elbow

2021 ◽  
Author(s):  
jianwei jia ◽  
hui huang ◽  
jian liu ◽  
liqiu chen
Keyword(s):  
Refined Oil ◽  
Oil Pipeline

scholarly journals Calculation method for the amount of contaminant oil during sequential transportation through product oil pipelines

2020 ◽  
Vol 38 (4) ◽  
pp. 1014-1033
Author(s):  
Enbin Liu ◽  
Wensheng Li ◽  
Hongjun Cai ◽  
Weibiao Qiao ◽  
Mohammadamin Azimi
Keyword(s):  
Cross Sections ◽  
Volume Fraction ◽  
Mixing Length ◽  
Refined Oil ◽  
Oil Pipeline ◽  
Actual Operation ◽  
Mixed Oil ◽  
The Relationship ◽  
Replacement Time

A considerable amount of oil contamination is caused by the presence of the trailing oil. This paper aims to simulate and analyze the influences of trailing oil on the quality of oil products in undulating sections. By studying the formation mechanism of mixed oil at inclining pipeline sections and the influences of velocity and oil batches on incline sections, as well as both ups and downs, the correlation is obtained between replacement time of different batches and velocity at various sections. By applying FLUENT 14.5, the maximum time of volume fraction of contaminant oil from 1% to 99% is simulated at cross-sections among different pipeline sections. Aiming at the relationship between oil product replacement time and change time of mixing section volume fraction and flow velocity, the mixing increment of undulating section relative to straight section is obtained. Combining with the empirical mixing length calculation equation, the equation for calculating mixing length considering terrain undulation is obtained. Combined with the actual operation data of Lan-Chengyu’s product oil pipeline, the error of the new mixed oil length calculation equation and actual oil mixing is 0.7966%. Excessive cutting amount of mixed oil will result in the waste of refined oil, and the less cutting amount will cause pollution of refined oil. The new mixed oil length calculation equation can more accurately guide the oil mixing cutting work at the oil station.

Application of the FTA in the Risk Management of Refined Oil Pipeline

2012 ◽  
Vol 226-228 ◽  
pp. 2211-2216 ◽  
Author(s):  
Ling Ling Zhang ◽  
Gang Fu ◽  
Xian Fu Wang
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Third Party ◽  
Refined Oil ◽  
Oil Pipeline ◽  
The Third ◽  
Risk Sources ◽  
Importance Analysis ◽  
The Third Party ◽  
Sources Of Risks

Building a fault tree for the refined oil pipeline on the basis of fault tree analysis method. By analyzing the potential risks existing in the refined oil pipeline, the main sources of risks have been figured out based on FTA. This paper aims to find out the key risk factors existing in the oil pipeline as followed: corrosion, machinery and material failure, the third-party damage and maloperation. The main risk sources and the vulnerable spots are found out through the structural importance analysis of the fault tree, including neglecting the construction supervision, corrosion detection, poor corrosion resistance, operation inspection and supervision and bad alarm system, cathodic protection failure and the third-party damage.

scholarly journals Research on Formation Mechanism of Trailing Oil in Product Oil Pipeline

2018 ◽  
Author(s):  
Enbin Liu ◽  
Wensheng Li ◽  
Hongjun Cai ◽  
Shanbi Peng
Keyword(s):  
Boundary Layer ◽  
Pipe Wall ◽  
Viscous Force ◽  
Refined Oil ◽  
Convection Diffusion ◽  
Oil Pipeline ◽  
Oil Transportation ◽  
The Dead ◽  
Modified Formula

Trailing oil is the tail section of contamination. There are two main reasons for the formation of trailing oil, one is the effect of laminar flow boundary layer, the other is the outflow of the preceding batch remained in the dead-legs. In the batch transportation of refined oil, under the action of viscous force, the preceding batch forms laminar boundary layer near the pipe wall and stays on the pipe wall, resulting in the phenomenon of contamination trailing and formation of trailing oil. When oil passes through the valve chamber of the oil transportation station, dead-leg will be formed. Due to gravity and convection diffusion, preceding batch flowing from dead-legs will form trailing oil in the pipeline. The phenomenon of trailing oil exists in the process of batch transportation, which will have an effect on the quality of oil. In this paper, Reynolds time-averaged method is used to simulate turbulence.Computational Fluid Dynamics(CFD) software is used to simulate different flow rates and bypass lengths to obtain contamination-related experimental data.Matlab software is used to perform multi-nonlinear regression for the oil substitution time, the length of the bypass and the flow rate. The formula for calculating the length of the trailing oil produced by the dead-leg is obtained. The modified formula for calculating the length of the contamination is obtained by combining the existing formula for calculating the length of the contamination.

scholarly journals Failure analysis and simulation model of pinhole corrosion of the refined oil pipeline

2019 ◽  
Vol 106 ◽  
pp. 104177 ◽  
Author(s):  
Qingshan Feng ◽  
Bingchuan Yan ◽  
Pengchao Chen ◽  
Siamack A. Shirazi
Keyword(s):  
Failure Analysis ◽  
Simulation Model ◽  
Refined Oil ◽  
Oil Pipeline

Investigation of the reasons for decreased efficiency of depressant additives during the pumping of paraffinic oils

2020 ◽  
Vol 10 (2) ◽  
pp. 157-163
Author(s):  
Alexander Y. Lyapin ◽  
◽  
Vladimir O. Nekuchaev ◽  
Sergei K. Ovchinnikov ◽  
Mikhail M. Mikheev ◽  
...  
Keyword(s):  
Crude Oil ◽  
Rheological Properties ◽  
Laboratory Studies ◽  
Refined Oil ◽  
Oil Pipeline ◽  
Pumping Stations ◽  
Key Factor ◽  
The Usa ◽  
Flow Through ◽  
Paraffinic Oil

The purpose of the research is to find out the reasons for the decrease in the effectiveness of the depressor additive DPN-1 as oil flows through the pipeline. The objects of the research are a mixture of paraffinic oils entering the Usa – Ukhta oil pipeline, either treated or untreated with DPN-1, as well as its mixture with highly-refined oil pumped from the Chikshino crude oil delivery and acceptance point. To achieve this goal, the rheological properties of oil were monitored at the main US oil pumping station, Chikshino and Ukhta-1 oil pumping stations; laboratory studies on the rheological properties attributed to simulated mixtures, compiled taking into account the volumes of oil delivered by various oil producers; and monitoring of the rheological properties of point samples of oils as they flow through the pipeline. The serial experiments resulted in establishing that the key factor in reduced efficiency of the DPN-1 additive used in the paraffinic oil mixture is the high pour point oil pumped from the Chikshino crude oil delivery and acceptance point (the share of which is 10 % of the total pumping volume).

Design of Blasting Scheme Based on Numerical Simulation

2013 ◽  
Vol 353-356 ◽  
pp. 1364-1369
Author(s):  
Zhen Hui Li ◽  
Yue Tang Zhao ◽  
Cheng Chu
Keyword(s):  
Numerical Simulation ◽  
Peak Velocity ◽  
Velocity Ratio ◽  
Quantitative Relationship ◽  
Vibration Velocity ◽  
Refined Oil ◽  
Oil Pipeline ◽  
Transmission Pipeline ◽  
Under Construction ◽  
Different Thickness

Operating safety of adjacent pre-constructed pipeline must be insured when the crude oil and refined oil pipeline is under construction. Applying finite element method, the peak velocities of observed points located at test segment and operating segment of West to East Gas Transmission Pipeline were calculated, and the ratio of the two peak velocities in different relative positions was also obtained. Taking advantage of quantitative relationship between the detonation charge and vibration velocity of particle on the pipeline, the ratio of detonation charge is derived from the peak velocity ratio, thereby the blasting scheme of West to East Gas Transmission Pipeline with different thickness is ascertained. This method is not only economical and convenient, but also has no damage to the pipeline, which also works for other blast schemes of different conditions.

Failure Analysis on a Non-Occupation Refined-Oil Pipeline

2016 ◽  
Vol 850 ◽  
pp. 977-983
Author(s):  
Feng Wang ◽  
Bin Feng ◽  
Bao Min Chu ◽  
Yu Ran Fan ◽  
Qiao Fei Sun ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Failure Analysis ◽  
Xrd Analysis ◽  
Experimental Results ◽  
Chemical Corrosion ◽  
Refined Oil ◽  
Oil Pipeline ◽  
Metallic Inclusions ◽  
Corrosion Pits ◽  
Corrosion Simulation

In this paper, the failure analysis was conducted on a non-occupation refined-oil pipeline, in which corrosion perforation occurs when the pipeline was filled with 1.2 MPa air for more than 1 year, and the material of the corrosion pipeline was L245. To find out the reason of the corrosion, some tests such as XRD analysis for corrosion products, corrosion pits analysis, inclusions and microstructure inspection, as well as corrosion simulation trial were conducted. The experimental results showed that the failure was caused by electro-chemical corrosion because of the dissolved oxygen, while the existence of 1.2 MPa inner air and non-metallic inclusions accelerated the corrosion.

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