scholarly journals Fatigue Investigations on Steel Pipeline Containing 3D Coplanar and Non-Coplanar Cracks

2020 ◽  
Vol 62 (1) ◽  
pp. 267-280 ◽  
Author(s):  
Zhongmin Xiao ◽  
Wengang Zhang ◽  
Yanmei Zhang ◽  
Mu Fan
Keyword(s):  
Steel Pipeline ◽  
Coplanar Cracks

Non-Contact Harmonic Magnetic Field Detection for Parallel Steel Pipeline Localization and Defects Recognition

Measurement ◽  
2021 ◽  
pp. 109534
Author(s):  
Yizhen Zhao ◽  
Xinhua Wang ◽  
Tao Sun ◽  
Yingchun Chen ◽  
Lin Yang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Steel Pipeline ◽  
Field Detection

Thermal shock and tritium resistance of SiO2 coating on the inner wall of 316L stainless steel pipeline

Vacuum ◽  
2021 ◽  
Vol 185 ◽  
pp. 110032
Author(s):  
Dong-Guang Liu ◽  
Ting-Ting Yang ◽  
Yu-Lan Liu ◽  
Lai-Ma Luo ◽  
Yu-Cheng Wu
Keyword(s):  
Stainless Steel ◽  
Thermal Shock ◽  
316L Stainless Steel ◽  
Sio2 Coating ◽  
Steel Pipeline

scholarly journals Finite Element Analysis of Composite Repair for Damaged Steel Pipeline

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 301
Author(s):  
Jiaqi Chen ◽  
Hao Wang ◽  
Milad Salemi ◽  
Perumalsamy N. Balaguru
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Hoop Stress ◽  
Pipe Wall ◽  
Von Mises Stress ◽  
Repair System ◽  
Composite Repair ◽  
Steel Pipeline ◽  
Von Mises ◽  
Infill Material

Carbon fiber reinforced polymer (CFRP) matrix composite overwrap repair systems have been introduced and accepted as an alternative repair system for steel pipeline. This paper aimed to evaluate the mechanical behavior of damaged steel pipeline with CFRP repair using finite element (FE) analysis. Two different repair strategies, namely wrap repair and patch repair, were considered. The mechanical responses of pipeline with the composite repair system under the maximum allowable operating pressure (MAOP) was analyzed using the validated FE models. The design parameters of the CFRP repair system were analyzed, including patch/wrap size and thickness, defect size, interface bonding, and the material properties of the infill material. The results show that both the stress in the pipe wall and CFRP could be reduced by using a thicker CFRP. With the increase in patch size in the hoop direction, the maximum von Mises stress in the pipe wall generally decreased as the maximum hoop stress in the CFRP increased. The reinforcement of the CFRP repair system could be enhanced by using infill material with a higher elastic modulus. The CFRP patch tended to cause higher interface shear stress than CFRP wrap, but the shear stress could be reduced by using a thicker CFRP. Compared with the fully bonded condition, the frictional interface causes a decrease in hoop stress in the CFRP but an increase in von Mises stress in the steel. The study results indicate the feasibility of composite repair for damaged steel pipeline.

Construction material supply risk management using Asian option contracts: the case of a pipeline project

2020 ◽  
Vol 27 (10) ◽  
pp. 3395-3414
Author(s):  
Mohammad Vahdatmanesh ◽  
Afshin Firouzi
Keyword(s):  
Risk Management ◽  
Scenario Analysis ◽  
Price Risk ◽  
Asian Option ◽  
Steel Pipeline ◽  
Content Type ◽  
Price Fluctuations ◽  
Option Contracts ◽  
Pipeline Project ◽  
Total Price

PurposeSteel price uncertainty exposes pipeline projects that are inherently capital intensive to the risk of cost overruns. The current study proposes a hedging methodology for tackling steel pipeline price risk by deploying Asian option contracts that address the shortcomings of current risk mitigation strategies.Design/methodology/approachA stepwise methodology is introduced, which uses a closed-form formula as an Asian option valuation method for calculating this total expenditure. The scenario analysis of three price trends examines whether or not the approach is beneficial to users. The sensitivity analysis then has been conducted using the financial option Greeks to assess the effects of changes in volatility in the total price of the option contracts. The total price of the Asian options was then compared with those of the European and American options.FindingsThe results demonstrate that the Asian option expenditure was about 1.87% of the total cost of the case study project. The scenario analysis revealed that, except for when the price followed a continuous downward pattern, the use of this type of financial instrument is a practical approach for steel pipeline price risk management.Practical implicationsThis approach is founded on a well-established financial options theory and elucidates how pipeline project participants can deploy Asian option contracts to safeguard against steel price fluctuations in practice.Originality/valueAlthough the literature exists about the theory and application of financial derivative instruments for risk management in other sectors, their application to the construction industry is infrequent. In the proposed methodology, all participants involved in fixed price pipeline projects readily surmount the risk of exposure to material price fluctuations.

40 years old LNG stainless steel pipeline: Characterization and mechanical behaviour

2017 ◽  
Vol 79 ◽  
pp. 876-888 ◽  
Author(s):  
Javier Sanchez ◽  
Oscar Galao ◽  
Julio Torres ◽  
Jose Fullea ◽  
Carmen Andrade ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Mechanical Behaviour ◽  
Steel Pipeline

HVDC Interference on MGL Pipelines

2021 ◽  
Author(s):  
Vipul Sawant ◽  
Shraddha Garate
Keyword(s):  
Direct Current ◽  
Gas Distribution ◽  
Operating Personnel ◽  
External Interference ◽  
Interference Phenomenon ◽  
Steel Pipeline ◽  
Pipeline Network ◽  
Technical Paper ◽  
Power Substation ◽  
City Gas

Abstract Mahanagar Gas is a City Gas Distribution Company engaged in the distribution of Natural Gas in and around Mumbai City. MGL has around 415 km of commissioned steel pipeline network which is being protected by ICCP. These pipelines are coated with three layer polyethylene coatings. Rectifying the external interferences on pipeline network is a major challenge for pipeline operating personnel in order to maintain safety and integrity of their pipeline. This technical paper is based on study of one of such external interference which posed a threat to MGL’s steel pipeline network. High Voltage Direct Current (HVDC) is a system for transmission of electricity over long distances. This system uses Direct Current (DC) for bulk transmission of electricity in contrast with the more common Alternating Current (AC) systems. HVDC is considered to be more effective to increase power grid delivery capabilities. A part of MGL’s pipeline network is currently facing interference due to a HVDC power substation on the outskirts of Mumbai. This substation is being operated by State Government and is affecting around 145 kms of MGL’s steel pipeline network during its monopolar operation for transmission of electricity. This interference is creating multiple anodic and cathodic areas on pipeline network with the help of a high magnitude current entering and exiting from pipeline at multiple locations which are difficult to predict and rectify. This technical paper will elaborate the concept of HVDC interference on steel pipelines. It will give a brief overview on the methodology adopted for identifying, monitoring and analyzing this interference phenomenon and will comment on the results of this analysis. It will throw light on a variety of technical challenges faced in dealing with this interference while operating a city gas distribution network in particular. And finally, it will discuss about possible remedial measures available and their effectiveness to curb this interference.

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