Alternative design for the replacement Cambridge Pipe Bridge

2021 ◽  
Author(s):  
Steven Prozniak ◽  
Safia Moniz ◽  
Jayden Mellsop
Keyword(s):  
Cross Section ◽  
Treatment Plant ◽  
Cost Savings ◽  
Environmental Risks ◽  
Maintenance Costs ◽  
Alternative Design ◽  
District Council ◽  
Truss Bridge ◽  
Seismic Resilience ◽  
Waikato River

<p>The new Cambridge Pipe Bridge crosses the Waikato River just south of the historic Gaslight Theatre in Cambridge, NZ. The original pipe bridge was a three span truss bridge with a triangular cross section built from steel circular hollow sections and was constructed circa the early 1970s.</p><p>Waipa District Council is in the midst of a Wastewater Treatment Plant upgrade including new, larger diameter pipework which was proposed to cross the original bridge. As part of the project, strengthening of the existing bridge was designed to accommodate the increased pipe diameter.</p><p>Eastbridge and Holmes Consulting developed an alternative tender submission for the main contractor for the works, Fulton Hogan. The alternative design is a new network arch bridge that provides cost savings relative to the original strengthening scheme, a reduction in safety and environmental risks during construction, reduced maintenance costs, and increased seismic resilience for this critical piece of infrastructure.</p>

scholarly journals Analysis of Awareness on Biogas Adoption as the Alternative Energy through the Blue Economy Concept Application

2016 ◽  
Vol 1 (1) ◽  
pp. 25-31
Author(s):  
Nurul Istiqomah ◽  
Izza Mafruhah ◽  
Dewi Ismoyowati ◽  
Nunung Sri Mulyani
Keyword(s):  
Alternative Energy ◽  
Public Awareness ◽  
Cost Savings ◽  
Community Perceptions ◽  
Theory Approach ◽  
Community Perception ◽  
Maintenance Costs ◽  
Economic Relations ◽  
Blue Economy ◽  
Willingness To Use

Objective - The purpose of this study is (1) to analyse community perception in the use of biogas as an alternative energy, (2) to analyse whether variables such as income, age, education, cost savings, and livestock maintenance costs actually affect the willingness of community to use biogas, and (3) to develop a relationship among potential regional resources in the blue economy development. Methodology/Technique - The method used in this study is a collaboration between quantitative and qualitative models. For the first research objective, the qualitative theory approach focused on in-depth interviews and focus group discussions to develop a variety of potential economic relations in the implementation of the blue economy. For the second objective, descriptive statistics was used to identify differences in community perceptions on the use of biogas by the people in the Ngawi and Boyolali regencies. For third objective, model is used to analyze whether income, age, education, cost savings, and livestock maintenance costs affect community willingness to use biogas: Findings - The results show that (1) there are different community perceptions on biogas adoption in the Ngawi and Boyolali regencies, (2) variables such as income, age, education, cost savings, and livestock maintenance costs affect the willingness of community in using biogas, and (3) the blue economy concept can be developed by utilizing economic potentials in Ngawi towards an energy-independent village. Novelty - The use of biogas as an alternative energy needs to be developed so as to stimulate influential variables that can raise public awareness because the method is simple and exploits local potentials without waste. Type of Paper: Empirical Keywords: Blue Economy; Public Awareness; Logit Regression; ABCG actors.

Cost-Effective Dewatering of Municipal Treatment Plant Sludges Using Belt Presses

1990 ◽  
Vol 22 (12) ◽  
pp. 173-182
Author(s):  
W. N. Clarke ◽  
Ed. Hodges ◽  
Robert J. Ooten
Keyword(s):  
System Performance ◽  
Selection Process ◽  
Treatment Plant ◽  
Cost Effective ◽  
Filter Press ◽  
Maintenance Costs ◽  
Capital Costs ◽  
Polymer Addition ◽  
The Past ◽  
Belt Filter Press

An evaluation was conducted at the County Sanitation Districts of Orange County (CSDOC) which led to the purchase and installation of the belt filter presses currently in use. A selection process was made including pre-qualification of bidders after an exhaustive nationwide search and study of all known existing belt filter press facilities. Subsequent methods were employed for purchasing belt filter presses of the same make and manufacturer. Operating experiences and maintenance costs as well as minor modifications which were found to be desirable were documented. The paper will discuss in some detail the design criteria, capacity, polymer addition system, performance at CSDOC Plant No. 1 and Plant No. 2, sludge characteristics and the effect of chemical conditioning. Discussion regarding operation and maintenance criteria, such as staffing, operating and maintenance modes, operational checks, belt life and belt specification, safety ventilation required for the removal of odorous materials and hydrogen sulfide, data recording, and polymer dosing is included. Cost considerations, including capital costs, as well as operating and maintenance costs for the past five years are covered.

Uprating of Mogden Sewage Treatment Works

2000 ◽  
Vol 41 (9) ◽  
pp. 53-61
Author(s):  
A.V. Koodie ◽  
I.J. Kirkaldy
Keyword(s):  
Sewage Treatment ◽  
Treatment Plant ◽  
Cost Savings ◽  
Control Cost ◽  
Process Improvements ◽  
The Us ◽  
Major Process ◽  
Urban Wastewater Treatment ◽  
Sludge Thickening ◽  
Research Budget

Mogden Sewage Treatment Works treats a population equivalent of approximately 1.8 m people from a catchment area of 160 sq. kilometres in North and West London. Substantial improvements have been undertaken over recent years including the automation of the works and major process improvements providing new sludge thickening facilities. In order to satisfy new obligations on treatment capacity set by the EC Urban Wastewater Treatment Directive a series of trials evaluating innovative and novel alternatives to conventional design were conducted. The “Mogden Trials” as they became known were granted a £1m research budget from the Thames Water capital release committee, however, substantial cost savings from an original capital control cost of £85m (NPV £141m) were considered possible. This paper describes how the savings were achieved through the trials and the assessment of options and provides details on the process of uprating the treatment plant including the successful partnering agreement between the owner/operator Thames Water and the US based company Black and Veatch.

Energy Saving in Mine Ventilation Roadway and its Optimization Model Solving

2013 ◽  
Vol 868 ◽  
pp. 291-295
Author(s):  
Jie Liu ◽  
Peng Yang ◽  
Wen Sheng Lv
Keyword(s):  
Mathematical Model ◽  
Cross Section ◽  
Least Square Method ◽  
Mine Ventilation ◽  
Least Square ◽  
Construction Costs ◽  
Maintenance Costs ◽  
Capital Construction ◽  
The Relationship ◽  
Power Costs

The paper is aimed at introducing our research of mathematical modelling of mine ventilation roadway optimal cross-section and its solving method. As we know, a rational cross-section should be determined to satisfy each intake and return airflow roadway based on the analysis of the relationship between ventilation cross-section and capital construction costs, in addition to maintenance costs and ventilation power costs. Reasonable selection of ventilation roadway cross-section is important to economic. The least square method is reasonable to build mathematical model for ventilation roadway costs. On the basis of previous studies, the relationship of capital construction costs and maintenance costs were further analyzed. Finally, considering the capital construction, maintenance and ventilation power costs three costs, the mathematical model was more accurate. Through researching a single ventilation roadway costs variation with the size of cross-section, cross-section size determined by considering time variable of costs was optimal, and built by this size could reduce economic investment. Hereby, it provides a solving method for the whole process of ventilation networks roadway cross-section optimization.

BUCKLING STRENGTH ANALYSES OF CORRODED TRUSS MEMBER WITH COMBINED CROSS SECTION

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Sae Teranishi ◽  
Tatsumasa Kaita ◽  
Tatsuro Yamane ◽  
Shuhei Kawami ◽  
Katashi Fujii
Keyword(s):  
Analytical Model ◽  
Cross Section ◽  
Steel Surface ◽  
Steel Structure ◽  
Forecast Method ◽  
Buckling Strength ◽  
Corrosion Pits ◽  
Truss Bridge ◽  
Working Out ◽  
Truss Member

It will be important to forecast future the deterioration of remaining strength on corroded members for working out reasonable maintenance scenarios on steel structure. In this study, the buckling strength analyses, including future forecast, were conducted for the vertical member, which has the combined cross-section in actual aging truss bridge. For constructing the analytical model, a simple corrosion progress model was applied to generating the corroded steel surface. In this corrosion progress model, it assumes that corrosion pits are generated by the attack factors which can be decided by some control parameters for corrosion environment, corrosion form and corrosion area. And, the constant number of the attack factors per year fall all over the discretized steel surface. The corrosion surface in the future can be generated numerically by repeating mentioned above. The average thickness calculated from the numerical corrosion surface was applied to the local corrosion area in each analytical model. From these analytical results, a future forecast method applying a corrosion progress model was discussed by focusing on the aging deterioration of the buckling strength.

Solar Concentrator Structural Optimization: A Variable Beam Cross Section Design

2017 ◽  
Author(s):  
Moucun Yang ◽  
Yuezhao Zhu ◽  
Wei Fu ◽  
Garth Pearce ◽  
Robert A. Taylor
Keyword(s):  
Structural Optimization ◽  
Cross Section ◽  
Cost Savings ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Maximum Displacement ◽  
Cross Sectional ◽  
Optical Efficiency ◽  
Box Structure ◽  
Section Design

The design and construction of solar concentrators heavily affects their cost, heat utilization and optical efficiency. Current trough concentrators support the reflector with an equivalent uniform beam configured from a metal grid sub-structure. Under gravity and wind loads, the support-structure stress distribution varies as a function of position of the structure and the tracking angle. In the conventional design, there is ample surplus stiffness and strength designed into some beams of the structure, which increases the overall weight and cost of the structure. This paper describes an approach towards structural optimization of trough concentrators (with the Eurotrough design taken as an example, that means that the safety factors and structure is similar with Eurotrough design) using a variable cross section beam. The main improvement of this approach comes from keeping the beams rigid and strong near the two ends (at the torque box structure) while allowing the middle of the structure to be relatively weak. Reducing the cross-sectional area of the central beams not only reduces amount of material needed for the structure but also reduces the deflection of the reflector. The simulated results show that the concentrator’s structural weight (including the torque box, endplates and cantilever arms) and the maximum displacement of the reflector are reduced about 15.3% (about 151.2kg per 12-metre long element) and 15.5%, respectively. This represents a meaningful capital and installation cost savings while at the same time improving the optical efficiency.

Towards a methodology for new technologies assessment in aircraft operating cost

2020 ◽  
pp. 095441002096467
Author(s):  
Valeria Vercella ◽  
Marco Fioriti ◽  
Nicole Viola
Keyword(s):  
New Technologies ◽  
Cost Model ◽  
Operating Cost ◽  
Cost Savings ◽  
Aircraft Design ◽  
Maintenance Costs ◽  
Direct Operating Cost ◽  
The Individual ◽  
Technological Improvements ◽  
The Impact

The need for a greener and competitive aircraft is leading to the use of new technologies. A thorough assessment of these technologies is mandatory from the initial phases of aircraft design to understand their feasibility and to select the most promising one both in terms of performances and in terms of costs. This paper proposes a methodology to assess the operating cost of innovative technologies for regional aircraft. In particular, two NASA studies have been adopted to determine the impact onto costs of MEA and AEA technologies and advanced ECS solutions for two innovative regional aircraft concepts developed during the European Clean Sky 2 research. The proposed methodology is able to assess the effect of on-board systems electrification level in terms of fuel and maintenance costs savings. The methodology, which allows to evaluate the effect of specific technological improvements onto costs, is applied exploiting the results provided by a reliable cost model and gives the opportunity to quantify operating cost savings for different regional aircraft. Applying the modified cost model to the reference aircraft under study, savings ranging from 1.6 to 3.1% of direct operating cost are estimated for MEA and AEA technologies. Greater savings are estimated for the individual cost items involved. More specifically, a reduction of fuel cost ranging from 6 to 14.5% is envisaged as a consequence of the lower SFC associated to innovative ECS technologies.

Sign in / Sign up

Export Citation Format

Share Document