MineARC’s ChemSAFE Safe Havens: the gold standard MechChem Africa speaks to Alex Farquhar of MineARC Systems, a world leader in controlled environments and safety technologies for underground mining, tunnelling, chemical processing and biotechnology industries.
ChemSAFE withstand’. We have solutions that can go well above industry standards with respect to blast resistance and chemical protection – in almost any application. We are confident in saying that our chambers will offer the protection required, regardless of the client’s response scenario,” Farquhar says. Custom-built to suit the facility’s needs, typical above-ground ChemSAFE refuge shel- ters are blast-rated for 5 psi overpressure, which is equivalent to a windspeed of over 160 mph that will completely destroy areas of a city. “We also have blast protection options of up to 12 psi if needed, which is the highest I have ever seen in any risk assessment. “By offering such high levels of protection on the chemical side, we are attracting a lot of interest from companies handling ammonia, along with those dealing with sour gases such as H 2 S,” he adds. Farquhar suggests that the use of a safety shelter above ground is often considered counterintuitive to the traditional safety response. “When an alarm goes off at the workplace, people are conditioned to follow the safest route out of the building and to assemble at an outside muster point. Going into a sealed chamber usually feels wrong. “In a chemical emergency, however, outside is not safe. We offer chambers for between 20 and 60 people, but 30 is a more manageable number to enable people to get in as quickly as possible; generally within a few minutes. We also have an expandable modular shelter design that can be expanded
Alex Farquhar (left), Global Petrochemical and Disaster Relief BDM for MineARC systems, installing a ChemSAFE refuge chamber for Castrol in Merak, Indonesia.
M ineARC Systems was founded as a specialist in the design, manufacture and supply of safety chambers for under- ground mining. “Refuge chambers are the backbone of our company and this success has expanded into the tunnelling construc- tion field. Both industries are exposed to the risk of fire and underground smoke, which can quickly contaminate the respirable at - mosphere. “We design safety shelters that can be located underground at emergency muster locations so people can get into them quickly and remain protected for the duration of any life-threatening incident,” says Alex Farquhar, the global business development manager for the company’s ChemSAFE emergency shelter solutions. Today, under the ChemSAFE brand, the company develops surface-based solutions for the oil and gas and chemical industries to serve a similar purpose. “These are designed to protect against releases such as chlorine, ammonia, hydrogen fluoride, hydrogen sul - phide and other chemicals that can be lethal or cause permanent damage,” Farquhar explains. “What differentiates ChemSAFE from other safety shelter providers is, while most shelters try to filter and purify the air, we cre - ate a totally sealed environment with its own atmosphere. We manage this by scrubbing out the CO 2 produced when people breathe inside the chamber, and replacing depleted oxygen to maintain a breathable atmosphere for all those being sheltered,” he continues. Competing systems, he suggests, attempt
to dilute the contaminated air and expel gases using compressed air, while controlling the leak rate. “We seal the shelter, apply a positive pressure and then manage the atmosphere inside totally independently of what is hap- pening outside,” he adds. Most ChemSAFE shelters are designed for 12 hours or less of safe refuge based on spe- cific site requirements. At-risk facilities such as fertilizer manufacturers or ammonia plants will usually have prepared incident response scenarios, which typically require between 30 minutes to six hours of protection against a gas release, based on the estimated time for the released volume to dissipate. “When I talk to industry groups dealing with major hazard facilities, one of the first questions is ‘What kind of scenario can a
A ChemSAFE refuge chamber create a totally sealed environment with its own atmosphere.
22 ¦ MechChem Africa • January-February 2022
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