http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 14.22Change: -0.10
R/$ = 10.61Change: -0.09
Au 1298.85 $/ozChange: -3.67
Pt 1480.50 $/ozChange: -8.00
 
 
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 Suppliers Directory Research Jobs Announcements Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Jun 01, 2007

A corrosion solution to ‘pig-out’ on

Back
Engineering|Africa|Bateman|Bateman Engineering|Cleaning|Filtration|Flow|Magnaflux|Pipe|Pipelines|Pipes|System|Systems|Union Carbide Corporation|Water|Africa|South Africa|United States|Chemical Cleaning|Cleaning|Flow|Mechanical AndnChemical Cleaning|Pipe-pigging Technology|Pipeline Systems|PipelinenSystems|Pipes|Steel|Systems|South African Government|Water|Pipe|Pipelines|Corrosion Protection|Pigging Technology|Pipe-pigging Technology|Thick And Ultrathick-film Technology|Thick AndnUltrathick-film Technology
Engineering|Africa|Bateman|Cleaning|Filtration|Flow|Pipe|Pipelines|Pipes|System|Systems|Water|Africa||Cleaning|Flow|Pipes|Steel|Systems||Water|Pipe|Pipelines|
engineering|africa-company|bateman|bateman-engineering|cleaning-company|filtration|flow-company|magnaflux|pipe-company|pipelines-company|pipes|system|systems-company|union-carbide-corporation|water-company|africa|south-africa|united-states|chemical-cleaning|cleaning|flow-industry-term|mechanical-andnchemical-cleaning|pipepigging-technology|pipeline-systems|pipelinensystems|pipes-industry-term|steel|systems|south-african-government|water|pipe|pipelines|corrosion-protection|pigging-technology|pipepigging-technology-technology|thick-and-ultrathick-film-technology|thick-andnultrathickfilm-technology
© 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
 
 
 
 
 
 
 
 
Other Corrosion Control, Coatings and Tribology News
Chemical producer BASF Coatings Services announced in January that a merger of two of its sales branches in Gauteng is planned for mid-2014. BASF Coatings Services is a specialist supplier of technology, service and training to the collision repair industry and...
Environmental corrosion combined with the damage from impact will affect an enclosure’s ability to properly protect the electrical controls, which can cause a multitude of problems, notes US-based nonmetallic electrical enclosure manufacturer Stahlin. Problems...
The South African Paint Manufacturing Association (Sapma) lodged its strongest objection to government’s continuous condemnation of the paint industry for producing leaded paints, while still neglecting the governmental prosecution of offenders Sapma has been...
More
 
 
Latest News
The Medupi power station project
Updated 5 hours ago Electricity producer Eskom has, for the first time, offered a detailed timeline for the synchronisation of Medupi Unit 6, which is officially scheduled for December 15, 2014. Addressing a joint meeting of the Portfolio Committees on Public Enterprises and Energy on...
Updated 5 hours ago As South Africa had largely exhausted the use of traditional mechanisms to stimulate the fiscus, government now needed to swing its focus to dealing with the internal structural issues that had, thus far, prevented the country from unlocking its true economic value,...
Updated 5 hours ago The Western Cape High Court will on Monday hear a Sanral application for information about the proposed N1/N2 Winelands Toll Highway Project to be kept secret, the City of Cape Town said. The application would be heard behind closed doors, mayoral committee member...
More
 
 
Recent Research Reports
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
Real Economy Insight: Steel 2014 (PDF Report)
This four-page brief covers key developments in the steel industry over the past 12 months. It provides an overview of the global and South African steel and stainless steel markets, South Africa’s major steel producers and events that have shaped these markets.
 
 
 
 
 
This Week's Magazine
Multinational semiconductor chipmaker corporation Intel announced its national campaign to further acquire partners to drive its She Will Connect programme, an initiative that aims to expand digital literacy skills to young women in developing countries, further into...
South Africa's MeerKAT radio telescope array programme should get back on schedule within a few months. This assurance has been given by SKA South Africa (SKA SA) associate director: science and technology Prof Justin Jonas. Early last month, Science and Technology...
The Passenger Rail Agency of South Africa’s (PRASA’s) Metrorail service will remain a subsidised service following its current multibillion-rand rolling stock, station, depot and signalling upgrade programme. PRASA group CEO Lucky Montana has allayed fears that...
GARYN RAPSON Contaminated Land Provisions in the National Environmental Management: Waste Act No 59 of 2008 will open the door for court battles to determine who will be held liable for the remediation
The uncertainties around the remediation of affected areas as addressed in the Contaminated Land Provisions in the National Environmental Management: Waste Act No 59 of 2008 will possibly spark litigation and disputes between landowners and businesses, contractors...
South Africa is currently the largest component of the African Development Bank’s (AfDB’s) active portfolio in Southern Africa, comprising 62.5% of the bank’s $7.9-billion exposure to the 12-country region – the second largest beneficiary is Mauritius, which...
 
 
 
 
 
 
 
 
 
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