http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.67Change: -0.10
R/$ = 12.36Change: -0.11
Au 1159.87 $/ozChange: -11.89
Pt 1076.00 $/ozChange: -12.50
 
 
Note: Search is limited to the most recent 250 articles. Set date range to access earlier articles.
Where? With... When?








Start
 
End
 
 
And must exclude these words...
Close Main Search
Close Main Login
My Profile News Alerts Newsletters Logout Close Main Profile
 
Agriculture   Automotive   Chemicals   Competition Policy   Construction   Defence   Economy   Electricity   Energy   Environment   ICT   Metals   Mining   Science and Technology   Services   Trade   Transport & Logistics   Water  
What's On Press Office Tenders Suppliers Directory Research Jobs Announcements Letters Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Jun 01, 2007

A corrosion solution to ‘pig-out’ on

Back
Engineering|Africa|Bateman|Cleaning|Filtration|Flow|Petroleum|Pipe|Pipelines|Pipes|System|Systems|Water|Africa|Cleaning|Flow|Maintenance|Pipes|Service|Steel|Systems|Water|Pipe|Pipelines
Engineering|Africa|Bateman|Cleaning|Filtration|Flow|Petroleum|Pipe|Pipelines|Pipes|System|Systems|Water|Africa|Cleaning|Flow|Maintenance|Pipes|Service|Steel|Systems|Water|Pipe|Pipelines
engineering|africa-company|bateman|cleaning-company|filtration|flow-company|petroleum|pipe-company|pipelines-company|pipes|system|systems-company|water-company|africa|cleaning|flow-industry-term|maintenance|pipes-industry-term|service|steel|systems|water|pipe|pipelines
© Reuse this Significant time and money could be saved in the mechanical and chemical cleaning, surface preparation and recoating of underground water reticulation pipelines in South Africa, through the use of on-site pipe-pigging technology, says corrosion engineering specialist Corrocoat South Africa’s MD Louis Pretorius.



Pretorius says that maintenance of the internal surfaces of pipes is far more problematic than the external surfaces, owing in part to severe access constraints. South African municipalities have already identified that large amounts of water are being lost every day owing to pipe leaks caused by corrosion.



He says that when corrosion protection is required, it is often too expensive and time consuming to dig up underground pipes and is more practical and cost-effective to fix the pipes while they are underground.



Pipe-pigging technology has been designed to specifically tackle the effects of access limitations as well as the high costs of internal pipeline coating, maintenance and refurbishment.



Initially, mechanical scraper pigs are applied to the internal surfaces of pipelines that are too small for conventional blasting and painting techniques. It is used extensively to clean pipeline systems when they are too small for human access, too long to clean adequately or too expensive to have sediment blasted out with high-pressure water, says Pretorius.



The pigs are launched into the pipeline, through the use of either compressed air or the use of the medium already in the pipe, as a vehicle. Scraper pigs of different configurations remove the corrosion and sediment build-up in the pipes, resulting in an increase in flow through the pipeline.



The pigs are inserted into the pipeline either by the use of a fabricated Y-piece introduced into the pipeline or through the use of an in-line launcher bolted to the pipeline wherever there is a break. It is therefore used, for example, at a valve point or bend. Once the pigs travel through the pipeline section, they are caught at the other end using a pig ‘trap’. Electronic pig signallers assist with the pig detection and progress while in the pipe and indicate when foreign matter is to be expelled at the other end.



After mechanical cleaning, ‘intelligent pigs’ can be run for pipeline assessment, or the pipeline can be further cleaned in preparation for lining. Chemical cleaning involves repeated runs with detergents, solvents, and acids. When the pipeline is thoroughly clean internally, it is ready to be coated with a seamless internal liquid glass reinforced polymer (GRP) lining.



In normal circumstances, a pipeline would be taken out of service for 10 to 20 days while the corrosion protection oper-ation is being undertaken, says Pretorius. He says that in certain conditions, one can use the pigs for cleaning and desilting purposes, without stopping the flow of process liquid in the pipeline. This is accomplished by using the same liquid as a vehicle to carry the pigs, coupled with a filtration system to prevent any contamination of the process liquid further down the line.



Pipeline pigging has existed in the petroleum industry in South Africa for over 25 years. The technology has been modified and further developed for introduction to the water supply industry over the last 18 months.



“As a direct response to the South African government spending more money on infra- structure and reticulation, a company decision was made to further develop the technology with the aim of offering this service to the water-supply industry at national level,” says Pretorius.



South African company Magnaflux originally developed the technology in conjunction with US-based Union Carbide Corporation in the early-1980s, he says. The technology was then sold to another South African company, Bateman Engineering, and Corrocoat was enlisted to carry out joint research and development with Bateman for two years, researching pigging techniques and the use of better types of coating materials to seal leaking pipelines. Thereafter, Bateman withdrew from the sector after considering pigging technology as a noncore business and many of the Bateman staff involved in the pigging technology joined Corrocoat, says Pretorius. Corrocoat then developed the technology further, advancing thick and ultrathick-film technology, which is one step further than corrosion protection, he adds.



Thick and ultrathick-film technology involves a range of different aspects, including the relining of pipe lines for corrosion protection purposes and the application of ultrathick (6-mm to 12-mm) GRP linings, effectively creating a ‘pipe within a pipe’, in which GRP is created within an existing corroded steel pipe.

To create the GRP, a thick, liquid, cold-curing polymer resin, is applied to the internal pipe surfaces using specialised coating pigs, controlled by compressed air. The resultant GRP lining cures within 24 hours, effectively creating a polymer pipeline within the existing corroded steel pipe line. The GRP can be installed over distances of up to 45 km on a single pig run, says Pretorius. The coating technology has also evolved from 50

Edited by: Laura Tyrer
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Corrosion and Tribology News
PUSHING ON Impala is investing in new equipment and modifying existing equipment in response to the declining demand for fasteners
South African fastener manufacturer and supplier Impala Bolt & Nut installed a new thread rolling machine last month, with its capacity to thread 400 bolts a minute significantly improving the company’s manufacturing capabilities, says company MD Derek Cohen. He...
BENEFICIAL MATERIAL Stainless steel handrailing offers numerous benefits among which is increased safety
Stainless steel handrailing can be used in various industries to ensure the safety of personnel and compliance with hygiene standards, says precision engineering company Andrew Mentis.
MEGA-DELIVERY The Medupi ACC drive order was the single biggest order received by the Sumitomo group worldwide, and became a material reference project
Gearbox designer and manufacturer Hansen Transmissions South Africa has completed the supply of 384 Hansen M4 air-cooled condenser (ACC) drives each to State-owned power utility Eskom’s coal-fired Medupi power station, in Limpopo, and the Kusile power station, in...
More
 
 
Latest News
Updated 16 minutes ago South African consultants Royal HaskoningDHV (RHDHV) and Tanzanian sub-consultant Howard Humphreys have been contracted to oversee the R450-million upgrade to Tanzania’s Kilimanjaro International Airport. Work would start this month and was expected to be completed...
Updated 39 minutes ago Kenya expects 20 companies to start investing about 8-billion shillings ($80-million) immediately in the African nation's textiles industry after the renewal of a deal offering access to the US market, its industrialisation minister said. President Barack Obama...
Updated 42 minutes ago South Africa is set to import more white maize from Zambia to prop up dwindling stocks from a harvest devastated by bad weather, trading and industry sources told Reuters on Thursday. Africa's biggest producer of the crop imported 163 t of white maize from its...
More
 
 
Recent Research Reports
Real Economy Insight: Steel
The Real Economy Year Book has been divided into individual reports under the banner Real Economy Insight and investigates key developments in the automotive, construction, electricity, road and rail, steel, water, coal, gold, iron-ore and platinum sectors.
Real Economy Insight: Road And Rail
Creamer Media’s Real Economy Year Book has been divided into individual reports under the banner Real Economy Insight and investigates key developments in the automotive, construction, electricity, road and rail, steel, water, coal, gold, iron-ore and platinum...
Real Economy Insight: Water
Creamer Media’s Real Economy Year Book has been divided into individual reports under the banner Real Economy Insight and investigates key developments in the automotive, construction, electricity, road and rail, steel, water, coal, gold, iron-ore and platinum sectors.
Real Economy Insight: Electricity
Creamer Media’s Real Economy Year Book has been divided into individual reports under the banner Real Economy Insight and investigates key developments in the automotive, construction, electricity, road and rail, steel, water, coal, gold, iron-ore and platinum...
Real Economy Insight: Construction
Creamer Media’s Real Economy Year Book has been divided into individual reports under the banner Real Economy Insight and investigates key developments in the automotive, construction, electricity, road and rail, steel, water, coal, gold, iron-ore and platinum...
Real Economy Insight: Automotive
Creamer Media’s Real Economy Year Book comprises individual reports under the banner Real Economy Insight and investigates key developments in the automotive, construction, electricity, road and rail, steel, water, gold, iron-ore and platinum sectors. This six-page...
 
 
 
 
 
This Week's Magazine
JSE-listed Afrimat will make a cash offer to acquire the entire remaining issued share capital of subsidiary Infrasors that it does not already own.
TEAMWORK Aggreko Europe, Middle East & Africa MD David Taylor-Smith; Aggreko Zambia chairperson Dr. Sixtus Mulenga; Aggreko Africa MD James Shepherd
Temporary power generation services provider Aggreko announced earlier this month that it had appointed Dr Sixtus Mulenga as nonexecutive chairperson of Aggreko Zambia, a move it believed was integral to the ongoing expansion of its operations in Zambia and the rest...
Major global aircraft manufacturer Airbus Commercial Aircraft is maintaining a steady course. "I don't have any big news, good or bad," company President and CEO Fabrice Brégier told international aviation journalists in Toulouse, France, at the company’s recent...
MEASURING DEVICES Bosch has released a mobile app that enables the measurements made with measuring devices to be sent and used directly on the app for accuracy and on-site quoting
Industrial tool manufacturer Bosch has increased the compatibility of many batteries in its range of blue industrial power tools and has released mobile-device applications (apps) for users of the tools, says Bosch South Africa training manager Peter du Bruyn. Many...
The new Nissan Navara has been launched onto the global market, but Nissan South Africa (NSA) will only know in August whether the local Rosslyn plant will assemble the one-ton pickup. The NSA plant currently produces the old NP300 Hardbody one-ton bakkie, as well as...
 
 
 
 
 
 
 
 
 
Alert Close
Embed Code Close
content
Research Reports Close
Research Reports are a product of the
Research Channel Africa. Reports can be bought individually or you can gain full access to all reports as part of a Research Channel Africa subscription.
Find Out More Buy Report
 
 
Close
Engineering News
Completely Re-Engineered
Experience it now. Click here
*website to launch in a few weeks
Subscribe Now for $96 Close
Subscribe Now for $96