http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.75Change: 0.08
R/$ = 10.96Change: -0.01
Au 1166.25 $/ozChange: -33.97
Pt 1228.50 $/ozChange: -17.50
 
 
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 Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Jun 17, 2011

Hot dip galvanising of fasteners to be reviewed

Back
Construction|Engineering|Africa|Cleaning|CoAL|Components|Education|Eskom|Petrochemicals|Platinum|PROJECT|Projects|Sasol|Africa|Cleaning|Equipment|Mining|Petrochemicals|Power Generation|Power-generation|Product|Products|Service|Steel|Bob Wilmot|Infrastructure|Iron Ore|Power|Corrosion Protection
Construction|Engineering|Africa|Cleaning|CoAL|Components|Education|Eskom|Petrochemicals|Platinum|PROJECT|Projects||Africa|Cleaning|Equipment|Mining|Petrochemicals|Power Generation|Power-generation|Products|Service|Steel|Infrastructure|Iron Ore|Power|
construction|engineering|africa-company|cleaning-company|coal|components|education-company|eskom|petrochemicals-company|platinum|project|projects|sasol|africa|cleaning|equipment|mining|petrochemicals|power-generation|power-generation-industry-term|product|products|service|steel|bob-wilmot|infrastructure|iron-ore|power|corrosion-protection
© Reuse this



The local practice of the hot dip galvanising of nuts and bolts is under review, as the industry aims to adhere more strictly to specifications set by the International Organisation for Standardisation (ISO), says Hot Dip Galvanisers Association of South Africa (HDGASA) executive director Bob Wilmot.

The current standard practice when hot dip galvanising grades 4.8 and 8.8 fasteners is to apply South African National Standard 121, or SANS 121 (ISO 1461: 2009), specifications and test methods.

SANS 10094 Annex B Edition 4.1 represents the current specification for hot dip galvanising of high-strength components greater than 1 000 MPa, such as grade 10.9 friction grip fasteners.

During 2010, the South African Bureau of Standards (SABS) circulated a Draft South African Standard that will adopt ISO 14399 as a replacement standard for fasteners.

SANS 14399 consists of ten parts for high-strength structural bolt and nut assemblies. The specifications are highly detailed and include greater controls and test procedures.

The effect of the proposed specifications on the hot dip galvanising of high-tensile fasteners, greater than 1 000 MPa, will be the replacement of SANS 10094 with SANS/ISO 10684 titled ‘Fasteners – Hot dip galvanised coatings’.

The current hot dip galvanising cleaning practice involves the pickling of high-strength fasteners in hydrochloric acid. This practice has the remote possibility of causing hydrogen embrittlement of the components.

ISO 10684 allows for both limited acid pickling as well as mechanical cleaning. However, Wilmot says local modifications are being planned to eliminate acid pickling and only allow mechanical cleaning. Implementation of this cleaning process will ensure the total elimination of the potential for hydrogen embrittlement.

Although the standard is still under discussion, Wilmot is confident that the SABS is committed to approving the new specifications, owing to the bureau’s tendency to lean towards adopting ISO specifications and implementing these without modification.

He feels this could have a positive impact on the industry, as it would ensure better quality control, give fastener manufacturers increased responsibility at all levels and extend fastener application.

“Manufacturers will have greater input throughout the entire production process, from checking the quality of the input material to ensuring that galvanising is done according to specification,” Wilmot adds.

Meanwhile, Wilmot tells Engineering News, State-owned power utility Eskom’s build programme to expand its power generation capacity is driving local enquiries about galvanising procedures.

“These are major projects that require not only enormous numbers of fasteners, but also fasteners that have a long life and low life- cycle cost,” he explains.

Industry Value
Wilmot says the estimated value of the local hot dip galvanising industry has grown over the last year.

Following a peak in 2007/8, the industry’s growth fell by between 8% and 10% owing to the economic downturn, after which it stabilised. But growth resumed in the 2009/10 financial year.

“During the last financial year we recorded 4% growth and we are going to conservatively project a further 3% to 4% improvement over the next financial year,” he notes.

However, the total growth of the industry depends on the number of major projects that are on offer.

“Some of our members have been busy with Eskom’s build programme and its associated infrastructure, such as the development of the Grootegeluk colliery. Further, the demand for galvanised fasteners in the mining industry has been fairly static; however, we hope to see growth in the platinum industry that will translate to an increase in demand for fasteners.

“Many platinum projects were put on hold but we believe that the economy has now reached a point where these projects will be resumed. This represents significant growth,” says Wilmot.

Continued growth in the coal-mining industry, not only associated with Eskom, but also with exports and petrochemicals company Sasol, augurs well for future growth.

“The export of commodities, such as coal, platinum and iron-ore, has increased. This has spin-off benefits for the galvanised fastener industry,” he adds.

Wilmot says it is important for engineers and their clients to distinguish and understand the difference between hot dip galvanised and zinc electroplated fasteners.

“Hot dip galvanised fasteners should be referred to as such and not simply as galvanised fasteners, as this could be, and is, confused with zinc electroplated components.

“From a corrosion protection point of view, hot dip galvanised fasteners have much better durability and service life, as the process produces a thicker coating,” he adds.

Hot dip galvanising coating thicknesses normally range between 60 µm and 70 µm, whereas zinc electroplating thicknesses are between 6 µm and 10 µm.

Challenges
Wilmot feels more attention needs to be given to emphasising the importance of fasteners across all industries.

“It sometimes appears that fasteners, which are in reality a highly technically important piece of equipment, do not receive the attention they deserve. Damage or shortages in supplies tend to be caused by end-users visiting the nearest hardware shop to purchase readily available fasteners, which, in most cases, consist of zinc electroplated fasteners,” he says.

“In general, what we advocate is for engineers to consider the life cycle costing for construction materials, including the appropriate corrosion control specification of fasteners, when projects are designed,” Wilmot adds.

Further, incorrect application owing to a lack of skills and training of construction personnel is another challenge with costly consequences.

“Installation of fasteners must be done correctly to ensure maximum product life and efficiency. Site assembly crews that are responsible for installation of structural steel must be educated to appreciate the importance of specified fastener assembly procedures. It often appears that end-users tend to treat fasteners as unsophisticated equipment; however, quite the opposite is true,” he explains.

Goal
Wilmot says the HDGASA’s aim is to develop the local hot dip galvanising industry, including the fastener market, and that the association aims to continually improve end-user education, where possible.

“We believe that, through proper education and creating an understanding of hot dip galvanised products, end-users will appreciate and apply such components on appropriate projects.

Associated with this is motivating our hot dip galvanising members to produce high-quality products,” he concludes.

Edited by: Chanel de Bruyn
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Fasteners News
PEM TYPE TSO4 The fasteners install reliably and permanently into stainless steel sheets as thin as 0.63 mm
Fastener solutions provider PennEngineering has launched a range of stainless steel self-clinching fasteners, the PEM Type TSO4, which provides ideal fastener solutions for stacking or spacing components to ultra-thin stainless steel panels.  The company states that...
Johannesburg-based fastener solutions provider Swagefast reports that it has experienced an increase in business since it ventured into manufacturing fasteners for the renewable-energy market in 2013. Company FD Jay Rossouw tells Engineering News that the company has...
SCARCE SKILLS Skilled employees between the ages of 50 and 60 and will soon retire… while we have training programmes, it is difficult to attract new entrants into the industry
The South African fastener sector is losing specialised skills as veteran workers are retiring, without skills transfer taking place. The industry also struggles to attract skilled graduates, says local standard nuts, bolts and other special fasteners manufacturer...
More
 
 
Latest News
Rosatom VP: sub-Saharan Africa Viktor Polikarpov
Updated 39 minutes ago Russian nuclear energy group Rosatom confirmed on Friday that it had canvassed funding options with South African government officials during a recent “nuclear vendor parade workshop” held in the Drakensberg on October 23. The company said the options discussed were...
Updated 43 minutes ago The shortfall on South Africa's trade account narrowed sharply to R2.91-billion in September from a revised R16.75-billion in August, as the import bill nearly matched that of exports, data from the revenue service showed on Friday. Exports in September rose by 18.2%...
Professor Steven Friedman
Updated 44 minutes ago Centre for the Study of Democracy director Professor Steven Friedman believes the prevailing view that a possible expulsion of the National Union of Metalworkers of South Africa (Numsa) from the Congress of South African Trade Unions (Cosatu) would lead to “a Cosatu...
More
 
 
Recent Research Reports
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
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.
 
 
 
 
 
This Week's Magazine
In the next 20 years, it was expected that, in Africa, more people would live in cities and towns than in rural areas, United Nations Habitat executive director Dr Aisa Kirabo Kacyira said at the Human Settlements Indaba that took place earlier this month in...
Tough-talking Human Settlements Minister Lindiwe Sisulu has committed government to building 1.5-million low-cost houses over the next five years, telling the Human Settlements Indaba in Johannesburg on Wednesday that the State would achieve this target through the...
Over the past 20 years there has been persistent concern about deindustrialisation in South Africa, as well as the fact that locally produced manufactured products have been increasingly displaced by imports.
Financial agreement for Ghanian independent power producer (IPP) Cenpower Generation Company’s $900-million, 350 MW combined-cycle gas-turbine power plant was finalised earlier this month, paving the way for the project’s construction to begin before 2015 in Tema,...
The revenue implications for South Africa of ‘base erosion and profit shifting’ by corporate taxpayers are firmly in the crosshairs of the Davis Tax Committee (DTC) and Judge Dennis Davis hinted last week that recommendations were being considered to “detect and...
 
 
 
 
 
 
 
 
 
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