Induced draft (ID) fan lubrication system design review and proposed modification upgrade at Callide C Power Station

[Abstract]: Australia’s coal fired power stations are the most efficient form of providing bulk base load power generation (i.e. electricity) to consumers. This is due to Australia having an abundance of thermal coal reserves, which is the fuel used in coal fired power stations. Therefore it is extremely important that these power stations operate at maximum availability and reliability to ensure the consumer receives cost effective and uninterrupted electricity. Callide C Power Station in Biloela Queensland is a 900 Megawatt (MW) coal fired power station that was commissioned in 2001. Unfortunately Callide C Power Station has been plagued with continuous operational and reliability problems caused from the induced draft (ID) fans since initial commissioning. The ID fan problems have arisen from the bearing lubrication system which provides oil recirculation to the induction motor bearings and fan main shaft bearings. Consequently these issues have caused half-load unit (225 MW) run-backs and full unit (450 MW) trips over the past decade. This project’s aim is to analyse the ID fan lubrication system and then identify and define all root causes and their associated failure modes. Once all root causes are identified through Root Cause Analysis (RCA) process, effective design solutions can be researched and evaluated so a proposed modification design project can be finalised. This final design proposal will be used to justify capital expenditure so implementation can occur in the near future

Explaining Anglo-Saxon military efficiency: the landscape of mobilization

The importance of warfare in Anglo-Saxon England is widely accepted, but the processes by which armies were put in the field are only partially understood, with most discussion focusing on the economic logistics rather than the spatial practicalities of mobilisation. Yet such a system underpinned recorded military actions and must have evolved in response to changing military organisation in the late Anglo-Saxon period. Through an assessment of documentary references to sites of muster, and by using a multidisciplinary landscape-focused approach, this article examines possible traces of that system – especially those preserved in place-names – and relates them to later Anglo-Saxon administrative geography

Identifying outdoor assembly sites in early medieval England

Venues of outdoor assembly are an important type of archaeological site. Using the example of early medieval (Anglo-Saxon; 5th–11th centuries A.D.) meeting places in England we describe a new multidisciplinary method for identifying and characterizing such sites. This method employs place name studies, field survey, and phenomenological approaches such as viewshed, sound-mark, and landscape character recording. While each site may comprise a unique combination of landscape features, it is argued that by applying criteria of accessibility, distinctiveness, functionality, and location, important patterns in the characteristics of outdoor assembly places emerge. Our observations relating to Anglo-Saxon meeting places have relevance to other ephemeral sites. Archaeological fieldwork can benefit greatly by a rigorous application of evidence from place name studies and folklore/oral history to the question of outdoor assembly sites. Also, phenomenological approaches are an important in assessing the choice of assembly places by past people

Fulham 878–79: a new consideration of Viking manoeuvres

This paper uses evidence from a variety of disciplines in order to re-evaluate an apparently enigmatic event reported in several early sources – the landing of a Viking force at Fulham in 878. It examines the vocabulary of written accounts of their activities, sets archaeological evidence for a military camp at the site within a wider context, and gives further consideration to the strategic background of that location within a military landscape. These combined approaches, it is argued, allow a more detailed picture of this Viking war-band and its military significance to emerge