SAIMC


SAIMC: Johannesburg branch

September 2019 SAIMC

The July technology evening featured a presentation by Katlego Setwaba of Pepperl+Fuchs. The main focus of her talk was Ex p (purging and pressurisation). However, she started off by reminding us of the damage done by explosions, demonstrating the catastrophic effects if these are not prevented.

Ann de Beer (left) thanks Katlego Setwaba for the presentation.
Ann de Beer (left) thanks Katlego Setwaba for the presentation.

The three Gas Groups (IIA, IIB,and II C) and Dust Groups (III A, III B and III C) were tabled, A being the least sensitive to spark ignition, and C the most sensitive. She went on to cover zoning – Zone 0 being the most dangerous for gases, and Zone 2 has the least chance of the hazard being present. By contrast, dusts are correspondingly grouped into Zones 20, 21 and 22.

This was followed by the different explosion prevention techniques with a focus on flame proofing (Ex d, the containment of an explosion), intrinsic safety (Ex 1, limitation of temperatures and spark energy), followed by pressurisation and purging (Ex p, filling the equipment housing with clean air or inert gas).

Pressurisation is the maintenance of a positive pressure above atmosphere, after a preliminary purge. This can obviously not be done effectively in a dusty environment, so physical cleaning is required before pressurisation. In purging, the procedure is much the same, but instead of maintaining a static pressure, Katlego explained how there is a constant flow of clean air or inert gas through the enclosure. This of course requires a dedicated controller to carry out the pre-use purge, and to maintain the internal pressure.

It was an entertaining presentation, with plenty of questions, showing just how much expertise is required to prevent explosions. The branch thanks Pepperl+Fuchs for hosting the evening.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Vaal branch
September 2020, SAIMC , SAIMC
As South Africa celebrated Women’s Month in August, the Vaal branch and Proconics decided to celebrate women in engineering with a technical evening highlighting the importance of a diverse team for solving ...

Read more...
SAIMC to host webinar during Electra Mining Africa 2020 Connect week
August 2020, SAIMC , News
As part of Electra Mining Africa 2020 Connect week (7-11 September), the Society for Automation, Instrumentation, Mechatronics & Control (SAIMC) will be hosting a webinar on the subject: “Preparing South ...

Read more...
SAIMC: Johannesburg branch
September 2020, SAIMC , SAIMC
The August virtual technology evening was hosted by Eric Carter of turboTRAIN on the subject ‘Instrumentation fault finding: why it is problematic and what can be done about it’. During the presentation ...

Read more...
SAIMC: From the office of the CEO
September 2020, SAIMC , SAIMC
To address the skills shortage in the South African automation industry, the SAIMC plans to provide bursaries to students in fields of study related to automation and manufacturing.

Read more...
SAIMC: Durban branch
September 2020, SAIMC , SAIMC
The branch held its first virtual meeting and sticking to ‘old regimes’ it was held on the first Wednesday of the month, but sadly not at the Durban Country Club.

Read more...
Preparing South African business for the 4IR
September 2020, SAIMC , News
Incorporated into Electra Mining Africa 2020 Connect’s Automation Day, the SAIMC recently hosted a webinar under the title, ‘Preparing South African business for the 4IR, getting the business and technical frameworks right to ensure success’.

Read more...
SAIMC: Johannesburg branch
August 2020, SAIMC , SAIMC
Robert Wright of RJConnect discussed cyber security with the SAIMC members at the technology evening on 8 July. In this period, when so many people are working remotely and have meetings online, just ...

Read more...
SAIMC: Vaal branch
August 2020, SAIMC , SAIMC
At the technology evening on Wednesday 1 July, Rob Burns from Pepperl+Fuchs presented on Ethernet Advanced Physical Layer (APL) and the concepts and implications for the IIoT, collaboration, applications ...

Read more...
SAIMC: From the office of the CEO
August 2020, SAIMC , SAIMC
I read an article the other day titled “COVID-19 is accelerating 4IR – but SA may not be ready”. It refers to the fact that as one of the most unequal societies in the world, South Africa needs to facilitate ...

Read more...
SAIMC: Cape Town branch
August 2020, SAIMC , SAIMC
The last technology evening was held on the theme: “How secure is your Industrial Network?” The branch thanks presenter Rob Wright and RJ Connect for hosting this successful event. Rob is the managing ...

Read more...