http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 14.20Change: 0.17
R/$ = 11.58Change: 0.07
Au 1198.59 $/ozChange: 4.13
Pt 1200.50 $/ozChange: 3.00
 
 
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 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|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|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|iron-ore-person|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
China appears to have been routinely underestimating output from its sprawling steel sector, with official figures for last year alone 40-million tonnes below a key industry estimate - an amount equivalent to Germany's entire annual production. Beijing has vowed to...
Lumwana, Zambia
Canada’s Barrick Gold Corp will suspend operations at its Lumwana copper mine, in Zambia’s Northwestern province, after the country enacted legislation that raised the royalty rate on openpit mining operations from 6% to 20%. TSX- and NYSE-listed Barrick, the world’s...
The Labour Court in Johannesburg has set aside the 2011-2014 metal sector wage agreement, the National Employers' Association of SA (Neasa) said on Thursday. The 2011-2014 wage deal was the result of an agreement between the Steel and Engineering Industries...
More
 
 
Recent Research Reports
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
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.
 
 
 
 
 
This Week's Magazine
South Africa remains an important manufacturing and export platform for Ford Motor Company, says executive chairperson Bill Ford. However, he adds that other countries on the continent are “becoming interesting”, and that the US carmaker is casting its net wider for...
TO BE PHASED INTO SERVICE The first MeerKAT dish, with another 63 to come
Germany’s Max-Planck-Society (MPG) and the Max-Planck-Institute for Radio Astronomy (MPlfR) are investing €11-million (about R150-million) into South Africa’s MeerKAT radio telescope array programme. The money will be used to design, build and install S-band radio...
Infrastructure spend in sub-Saharan Africa will grow from $70-billion in 2013 to $180-billion by 2025, says PwC capital projects and infrastructure Africa leader Jonathan Cawood. This is one of the findings of PwC’s Capital Projects & Infrastructure report on East...
Private-owned defence and aerospace manufacturer Paramount Group and the Ichikowitz Family Foundation unveiled its Anti-Poaching Skills and K9 Training Academy in Magaliesburg last month.
MATT BARKER Wireless networks should enable users to engage and must provide relevant information to them based on their activity and location
The inclusion of Bluetooth to provide sub-three meter accuracy and heightened functionality for users is one of the ways to change existing wireless networks into engagement networks. An engagement network differs from common wireless networks in that it enables the...
 
 
 
 
 
 
 
 
 
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