IS & Ex


Trapped key interlocking

October 2017 IS & Ex

The manufacturing environment relies heavily on automated processes and machinery. Ensuring safety whilst delivering productivity is vital to every manufacturing facility and therefore safeguarding operators from hazards, as well as guaranteeing that processes run at optimum efficiency, is a constant challenge for manufacturing companies.

Fortress Interlocks are specifically designed for such applications and span manufacturing sectors from mining, power generation, steel, automotive, recycling, food and beverage, and packaging.

Deebar have exclusively represented Fortress Interlocks for over 35 years. Using its experience and Fortress’ 40 years in the safety interlocking business, it assists customers to create safe workplaces, where employees in industrial environments are safeguarded from injury, and equipment is protected from damage. A world leader in access control systems, Fortress Interlocks guarantee that actions and events are undertaken in a predetermined sequence ensuring a safe working environment.

Safety in power generation applications

Safety in the power generation industry is a top priority in South Africa and the potential risks working in these environments can be extremely high. Therefore, the safety and well-being of workers is paramount and companies strive to achieve nothing less than zero incidents.

In this industry, whether it is electrostatic precipitators, substations or breakers, Deebar has established itself as a leader in safeguarding the workforce that interact with the equipment on a daily basis. It has recently been awarded a contract to equip trapped key interlocks on an electrostatic precipitator at a power station in the Emalahleni area. This is the third station to upgrade its safety standards to incorporate trapped key interlocks.

Electrostatic precipitators depend on regular maintenance in order for them to perform at their optimum levels. This necessitates staff accessing the hopper doors frequently which places them at risk as the electrodes carry a charge of more than 10 000 volts.

Trapped key interlocks

Strict safety procedures need to be in place to prevent access before isolation of the HV transformer takes place. The trapped key interlocks ensure that a predetermined sequence is followed by releasing trapped keys, in order to activate the next stage of the process. This forced sequence will ensure that the equipment is isolated and earthed before any work commences.

With the interlocks eliminating the potential for human error and ensuring operations are performed in a safe manner, many companies are turning to Deebar to supply them with interlocking solutions. Fortress Interlocks can be retrofitted to many types of breakers including ABB, Siemens and Actom, which allows for easy isolation and quick access to hazardous areas.

Deebar currently imports the interlocks in component form and assembles the locks and systems locally. This allows not only competitive pricing, but better service too in terms of delivery time and repairs. The dedicated Fortress team are competent in the design of systems and interlocking procedures, as well as installation and maintenance.

All interlocks in the mGard range are robust and modular in construction, offering maximum flexibility for designers and are suitable for use in safety applications up to SIL 3 (EN/IEC 62061), Category 4 and PLe (EN/ISO 13849-1), as approved by independent test house TUV.

For more information contact Deebar, +27 (0)11 873 4332, [email protected], www.deebar.co.za



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Field service regime key for effective PDS/CPS operation
IS & Ex
While their primary objective is to ensure the safety of people, proximity detection system and collision prevention system installations also have a direct bearing on other critical parameters such as equipment availability and productivity.

Read more...
World’s first 5G smartphone for ATEX and IECEx zone 1/21
Extech Safety Systems IS & Ex
i.safe MOBILE has launched the world’s first 5G smartphone for ATEX and IECEx zone 1/21. The intrinsically safe mobile device, which was also developed for use in 5G campus networks, offers companies great flexibility thanks to its wide range of possible applications, especially in the automation sector.

Read more...
Fully Ex-certified access point solutions for wireless communication
Pepperl+Fuchs IS & Ex
Pepperl+Fuchs now offers a wireless access point solution that is fully certified in accordance with ATEX/IECEx standards, and forms the basis for end-to-end Wi-Fi communication in hazardous areas.

Read more...
Secure, digital communication in potentially explosive atmospheres
Pepperl+Fuchs IS & Ex
Consistently digitalised processes in the smart factory are a matter of course today, but not in potentially explosive atmospheres. The systems and devices used in these areas must have optimal protection mechanisms to ensure maximum safety.

Read more...
Functional and compatible intrinsically safe loop approvals
Extech Safety Systems IS & Ex
With all the focus on IS loop approval, it is easy to forget to check that the loop will function correctly to see whether the field device has sufficient power (voltage & current) to operate over the full process range.

Read more...
Upgrade your legacy alarm units
Omniflex Remote Monitoring Specialists IS & Ex
Darren Barratt, sales manager at alarm annunciator specialist Omniflex, explains the drawbacks of leaving outdated rack-based alarm annunciator systems in place, and why an upgrade might be simpler than you would expect.

Read more...
Cathodic protection system for hazardous environments
Omniflex Remote Monitoring Specialists IS & Ex
When NSW Ports in Australia embarked on a two-year programme to rehabilitate the structures and combat corrosion levels at its Bulk Liquid Berth 1, it commissioned Melbourne-based consultancy Infracorr to deliver a bespoke cathodic protection) system. To deliver the system safely, Infraccor engaged cathodic protection specialist Omniflex to support the hazardous area and remote monitoring aspects of the CP system design.

Read more...
Leading the way in PDS technology
IS & Ex
Booyco Electronics, an original equipment manufacturer specialising in mine safety equipment, has witnessed a surge in demand for its proximity detection systems (PDS) and collision prevention systems (CPS) since the Mine Health and Safety regulation focusing on trackless mobile machinery was promulgated. These systems offer crucial vehicle-to-pedestrian and vehicle-to-vehicle detection capabilities.

Read more...
Ensuring lone worker safety
IS & Ex
The Conextivity Group’s startup – Wearin’ – has developed a solution connecting the lone worker with the control centre. This was commissioned by concrete producer, Pro Beton to ensure the safety of its teams of machine operators and cleaners working on production sites during the day, night, and weekends.

Read more...
Safety breakthrough in live testing of large equipment
IS & Ex
While essential to effective maintenance, the live testing of mining vehicles and equipment can be hazardous and time consuming; but this has all changed with the SafeGauge range of digital testing systems. Developed in Australia, SafeGauge is now distributed in South Africa by Booyco Electronics, known for its leading role in promoting safety on mines through its proximity detection systems.

Read more...