Wesley Sim

last updated 3/19/2018

Wesley Sim

HazmastersED Safety Skills Instructor at Hazmasters Inc

6170 Belgrave Road, Mississauga, Ontario, Canada
HQ Phone:
(905) 890-2784

General Information


CSO Instructor - ER Plus Risk Management Group Incorporated

Recent News  


The primary atmospheric danger in confined spaces is oxygen deficiency or enrichment, says Wesley Sim, technical safety instructor at Hazmasters in Burnaby, B.C.
The permissible oxygen range is 19.5 per cent to 23 per cent. Sim, however, advises his students not to enter a space unless the oxygen level is at 20.9 per cent. Sim says three processes commonly consume oxygen in confined spaces: • ?microbial action caused by organics • ?hot work (burning processes require oxygen; plus, leakage of shielding gas from a welding hose can displace oxygen) • ?oxidation, a problem affecting barges and underground pipes and ladders. Another atmospheric hazard is flammable gases, vapours and dusts, Sim says. The concentration of these substances should be kept to less than 10 per cent of their lower explosive limit (LEL). The atmosphere should also be monitored for toxic air contaminants. Accidents in confined spaces tend to be serious, often fatal, so it is always better to err on the side of safety, Sim says. "In a confined space, the game is different. It's not like working in a shop," he says.

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