Articles
12.06.2006
Construction of the interceptor in Dresden's old town centre. Linear Shoring: Making progress with large clearance
Sewer construction work in Käthe-Kollwitz-Ufer (road along the river bank) in Dresden got underway in September 2005. On behalf of Stadtentwässerung Dresden GmbH (the city sewers authority), the interceptor in the old town centre is being replaced from the stormwater tank in Johannstrasse to Bundschuhstrasse. A joint venture between Heinrich Lauber GmbH & Co. KG (technical management) and Braumann Spezialtiefbau GmbH (commercial management) is executing the first stage of the project in the Elbe meadows.
mehr30.05.2006
Jointing Technology for PE pipes: Design features for increased processing safety of Electrofusion fittings
Pipelines are investment objects. The largest part of the capital of an utility or sewage company lies in the subterranean infrastructure of its pipe system. Its safety is – naturally – an essential aspect for the economic success of this system and vital for it to carry out tasks reliably. This article deals with the aspects of product safety in application for the electrofusion procedure as jointing technology for PE pipes.
mehr28.04.2006
Optimised Properties. PE-HD Compounds for Pipe Extrusion.
As a compound for pipe extrusion, PE-HD has experienced 50 years of continuous success both in terms of ever increasing production quantities and in terms of constant product improvement - one example being the development of bimodal PE-HD. With a multimodal PE-HD the processing characteristics can now be improved in particular.
mehr28.03.2006
Rehabilitation of pipes with a non-circular cross-section
HOBAS NC Line - for pipes with a non-circular cross-section HOBAS NC Line are glass-reinforced polyester (GRhttp://www.unitracc.de/aktuelles/artikel/rehabilitation-of-pipes-with-a-non-circular-cross-section-en#fieldsetlegend-datesP) pipes manufactured using the filament winding process and designed for construction or rehabilitation of non-circular sewers. The special pipes can be made to fit inside the old sewer for rehabilitation or in virtually any shape required for new installations. HOBAS NC Line Pipes are consisting of polyester resin, quartz sand and glass.
mehr27.03.2006
First high strength pipeline section in Italy
Snam Rete Gas decided for the first time to lay a pipeline section in L555 MB (X80) steel in Italy as part of the TAP project on high strength steels, sponsored by ENI Group. This pipeline trunk, 10 km long, will be placed on the Enna-Montalbano line which, for the remaining part, will be built in X65, the maximum steel grade used till now by Snam Rete Gas. This paper presents information on the pipe and bend production and on the preliminary experimental activity performed for weldability and field bending items.
mehr22.03.2006
Correct defect identification and damage assessment in general and of corrosion defects in particular as basis for efficient sewer rehabilitation planning
ABSTRACTAs waste water systems get older, their performance tends to decline. Breaks, cracks, corrosion and other types of failures causing leakage, hydraulic bottlenecks etc. up to collapsing sewers and mains. Condition assessment – either cyclic or demand orientated – is the basis for rehabilitation planning. The quality of inspection and assessment forms the base for cost efficient and sustainable section and network rehabilitation. Especially corrosion defects are difficult to identify and separate from other defects such as abrasion or incrustation. The correct identification of each of the defects is one major issue for later rehabilitation planning. Another one is the correct assessment of such defects. Sophisticated damage models, based on stability analysis, allow the possibility of detailed section assessment needed for priority ranking and the indication of the rehabilitation type (repair, renovation or replacement). The theoretical background of the different steps is outlined and all issues are dealt with in detail on examples.
mehr20.03.2006
Modern methods of installing dependable hydrants
In cases of fire outbreaks, a constant and reliable supply of water must be readily available to enable the fire fighters to complete their allotted task. At the same time the water supply utilities are obliged to take the necessary measures to ensure that a piping network can be effectively filled, vented, flushed and drained as well as to be able to provide temporary or emergency supplies through the use of hydrants. Each and every pipeline component installed up to the hydrant outlet must function in a reliable manner. Other factors such as traffic flow, space requirements and hydrant type must be taken into consideration during the installation of such water hydrants. This paper is intended to give an overview of the products and methods in use today as well as future developments in this direction.
mehr15.03.2006
Integral ball takes up movements - Flexible house connections
The quality of our ground water and soil is determined not least by the state of sewers and pipework. High-grade pipes and proper economic construction of the sewers are a basic requirement for a long lasting network of pipelines. Intact sewerage pipes ensure that foul and rainwater is taken away safely and quickly. Modern sewer building is thus an investment for the future.
mehr12.03.2006
Breakthrough in rubber hose technology for deep-water oil exploration
Oil companies have recently been looking at hitherto unexplored deepwater environments for new sources of black gold. But along with a whole raft of complications and demands brought about by this new environment is the problem of how the oil can be transported safely and efficiently from the source. However, thanks to a breakthrough in marine rubber hose technology, Trelleborg's Trelline system can now ensure the safety and efficiency of this connection, with significant overall cost reductions.
mehr08.03.2006
High quality PP-B pipe materials for sewage pipe systems
Polypropylene (PP) materials have been successfully used for the manufacturingof piping systems for a long time and have demonstrated their performance inpressure and non-pressure applications. Polypropylene block copolymers (PPB),which exhibit excellent impact resistance amongst other properties, are predominantlyused for the manufacturing of non-pressure sewage and drainage pipe systems.
mehr02.03.2006
Short burst, big savings
In the midst of a $US53 million addition to the Mechanical Engineering building on the Purdue University campus, it was discovered that a 15 foot deep, 12 inch clay sewer lateral that serviced the building had a collapsed section of pipe.
mehr22.02.2006
New field joint Coating system for trenchless laid steel pipes
Corrosion protective coatings of steel pipes laid by horizontal directional drilling are particularly stressed. Thermosetting compounds based on polyurethane or epoxies have proven their performance for the protection of welded joints of such pipes. The application of thermosetting joint coatings can currently be carried out in a lamination process, resulting in glass reinforced plastics coatings, or by spatula in case of polyurethane based materials.
mehr22.02.2006
Tunnelling down under
Tunnelling and underground construction projects continue to boom in Australia and New Zealand, driven largely by the rapid urbanisation of capital cities.
mehr15.02.2006
Economically motivated maintenance decisions and their influence on the calculation of fees and tariffs (strategies and scenarios)
The maintenance of water/ gas distribution and sewer networks remains a permanent task due to the extent of necessary measures and the linked budget demands and therefore requires future-oriented strategies. The essential challenge of developing sustainable strategies consists in finding a way, which represents a long-term compromise between the requested service level and the costs.
mehr12.02.2006
Discrete sewage treatment for English resort town
Eastbourne Wastewater Treatment Works (WTW), is located on the south coast of England. It is owned and run by Southern Water. They have recently spent £22 million on significant improvement - but the 138,000 residents of the catchment areas in the resort towns of Eastbourne and Pevensey, will see very little of it, as the works are almost all underground.
mehr10.02.2006
Optical in-line inspection tool for internal monitoring of pipelines
This article will introduce a new range of opto-electronic in-line inspection tools. The technology incorporated into the tool includes a laser-based 3D-imaging technology providing enhanced resolution and detection capabilities for the inspection of the internal surface of a pipeline.
mehr07.02.2006
Concrete & Water — a new heat storage & exchange medium to improve seasonal effectiveness of solar thermal and other alternative heat energies
A new concept of underground long- and short-term heat storage and exchange advised for modern district and single building energy efficient heating and cooling systems.
mehr06.02.2006
Not only for drain construction - Linear Shoring: Varied applications thanks to modularity
Linear Shoring from Emunds+Staudinger has proven successful in many projects at home and abroad. The sliding rail shoring system is available not only in a single-rail variant and as overlapping Linear Shoring, but also as single-rail and overlapping inner-city Linear Shoring.
mehr02.02.2006
Water leak detection - precise pin-pointing of faults
Different from electro-acoustic principles to locate water leaks, which are using different kinds of microphones to analyse loudness of leak noises for pin-pointing, correlation is based on the run-time difference of acoustic signals created by the water discharging from the leak.
mehr25.01.2006
Trenchless technology and asset management in Australia
It is fitting that as the global Trenchless Technology community gathered for the 24th International No Dig Conference in Brisbane, Trenchless Australasia magazine has completed its first survey for the industry in Australia.
mehr18.01.2006
Geographic Information Systems (GIS) - an Advanced Tool for the European Water Industry
Interdisciplinary approaches and solutions are becoming increasingly widespread in the European water industry following the introduction of the European Water Framework Directive (WFD).
mehr15.01.2006
The use of hydraulically bonded filling materials for the backfill of utility trenches in sewer construction
For several years now, self-compressing filling materials that are flowable when installed and subsequently self-hardening have been increasingly applied (mixtures of construction materials or mixtures of soil binders). They are named by the manufacturer or, in literature, referred to as liquid soil, soil mortar or filling mortar. They predominantly serve to fill the embedment, but in some cases also to produce the main filling. The following contribution serves to introduce the latest expert discussions, especially of planning agencies, of communities and suppliers of pipe networks as well as to present the pros and cons of the application of hydraulically bonded filling materials from the point of view of construction technology and statics.
mehr11.01.2006
Slurry pumps handle abrasive iron ore slurry
At an iron ore outloading site in Australia, seasonal torrential downpours led to a tremendous volume of abrasive slurry that could not be handled in an effective manner by existing cantilever pumps. To resolve this situation, ITT Flygt unit provided the mining company with a complete solution built around its slurry pumps that finally solved a 30-year old problem.
mehr02.01.2006
Quality controls are key to successful CIPP lateral lining applications
Laterals are the underground sewer service pipelines that connect from a building, such as a private house or commercial property, to the main line sewer. Typically private house laterals are 4” to 6” in diameter. Commercial properties and multi-unit residential properties can have much larger sizes. Laterals typically run under landscaped areas, driveways or parking lots. The aim of CIPP lateral lining is to solve many problems that occur with deteriorating laterals instead of replacing them. While these problems vary from lateral to lateral, a successful CIPP lateral lining application or product needs to solve a variety of existing lateral problems that may be encountered from location to location. This may require different materials to suit different kinds of lateral situations.
mehr20.12.2005
Stability of a Borehole during Horizontal Directional Drilling
A group of Dutch drilling contractors and engineering consultants are working together to enhance their knowledge on borehole stability during Horizontal Directional Drilling (HDD). The influence of arching on the stability of a borehole filled with bentonite has been tested with the geotechnical centrifuge of GeoDelft in combination with the maximum mud pressure the borehole can withstand before a blow-out occurs. The centrifuge tests have been analyzed using a Finite Element Program (PLAXIS) with respect to arching around the borehole. The test results are compared with the PLAXIS outcome.
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