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.

Laterale Pendelschwingungen beim Reiben*/Lateral pendulum oscillation in reaming

2018 ◽  
Vol 108 (01-02) ◽  
pp. 33-40
Author(s):  
E. Abele ◽  
N. Lautenschläger
Keyword(s):  
Automotive Industry ◽  
Experimental Verification ◽  
Engine Block ◽  
Technical Paper ◽  
Pendulum Oscillation

Geriebene Präzisionsbohrungen finden in vielen Branchen Anwendung, besonders die Automobilindustrie und Hydraulik-/Pneumatikbranche sind hier von großer Bedeutung. Bei der Serienfertigung von Komponenten des Antriebsstrangs, speziell des Motorblocks, ist das Einbringen von Präzisionsbohrungen unerlässlich für die Funktionserfüllung. Dieser Fachaufsatz befasst sich mit der Simulation des Reibprozesses und der experimentellen Verifizierung. Besondere Aufmerksamkeit gilt hierbei dem Effekt der lateralen Pendelschwingung.   Reamed precision drillings are used in many industries, especially the automotive industry and hydraulics / pneumatic industry are of great importance here. In the production of components of the powertrain, especially the engine block, the introduction of precision drillings is essential for the functionality of the workpiece. This technical paper describes the simulation of the reaming-process and its experimental verification. Particular attention is given to the effect of the lateral pendulum.

Mainstreaming pre-manufactured offsite processes in construction – are we nearly there?

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Joseph Kwame Ofori-Kuragu ◽  
Robert Osei-Kyei
Keyword(s):  
Construction Industry ◽  
Relevant Literature ◽  
Future Research ◽  
Content Type ◽  
Technical Paper ◽  
Sustainable Systems ◽  
Technology Firms ◽  
Current State ◽  
Academic Publications ◽  
The Subject

Purpose The purpose of this paper is to explore the current state of popular modern methods of construction (MMC) and pre-manufactured construction in the construction industry and propose a framework for future implications for practice and future research. Design/methodology/approach This technical paper is based on a narrative review of the extant literature on the subject. First, the Scopus search engine was used to retrieve relevant papers on MMC, offsite and pre-manufactured construction. Second, institutional literature such as reports by industry professional and trade bodies, literature from leading technology firms and contractors with experience of MMC were extracted. These two strands of literature were synthesised and a comprehensive discussion on the topic was provided. Findings Results show that journal publications on MMC and pre-manufactured construction have increased in the past decade. The paper found significant advances in the development of premanufactured and offsite construction approaches with many benefits. Offsite and pre-manufactured construction are viable and sustainable systems currently suitable for wider adoption as the mainstream construction method. Research limitations/implications This technical paper based on an integrative review of relevant literature could have benefitted from interviews of professionals with experience of offsite and pre-manufacture techniques and from wider availability of current academic publications on the subject. Validation of the framework has not been undertaken. Originality/value Not much-published work has been undertaken on the current state of development globally and the viability of these construction approaches. This paper evaluates evidence from academic and industry sources to address this gap. A framework has been developed which can help the industry’s industrialisation drive.

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