Current affairs Risk Profile Impact
Hazardous property or condition
Volume Hazard Process or activity Figure 1
temperature, flash point, boiling point, upper and lower explosive limits, additional effects on the environment, storage restrictions and conditions, and firefighting measures. • autoignition temperature or kindling point of a substance is the lowest temperature at which it spontaneously ignites in normal atmosphere without an external source of ignition, such as a flame or spark
• flash point of a volatile material is the lowest temperature at which its vapours ignite if given an ignition source
• boiling point is when a substance reaches the temperature at which the vapour pressure of a liquid equals the pressure surrounding the liquid, enabling the liquid to form a vapour
• the maximum concentration of a gas or vapour that will burn in air is defined as the upper explosive limit (UEL), above which the mixture is too rich to burn – the range between the upper and lower (LEL) is known as the flammable range for that gas or vapour, while the LEL is
Material Kerosene
Distillates (petroleum), hydrotreated light
Nature of hazard
Highly flammable liquid and vapour
Boiling point = 140oC
Flash point = 38oC
Lower explosive limit (LEL) = 0.7%
Upper explosive limit (UEL) = 5%
Autoignition temperature >250oC
(see MSDS) Figure 2
www.frmjournal.com MAY 2020 47
Quantity and location
There is a 100 litre kerosene cylinder located in the workshop
Use
hazardous activities
The kerosene forms part of the recirculated parts wash, which is situated in the workshop
known as the minimum concentration of a particular combustible gas or vapour necessary to support its combustion in air
These factors should then be entered into the risk assessment along with quantities, location, control measures and any additional such measures required. This will later assist in the development of a significant findings action plan and designation of hazardous area classification. The table in Figure 2 is a working example
relating to kerosene, a flammable liquid. The process for managing dusts, dust cloud formations, flammable and inert but compressed gases should follow the same process. It is ultimately the responsible person’s responsibility to ensure that dangerous substances are effectively managed, minimised where possible, or replaced to reduce the risk of fire and explosion. Risk reduction measures should follow the hierarchy of controls process, discussed in the first article.
Hazardous area zoning
Following the analysis of the materials stored and used on site, the risk assessment will review
Current control measures
Spill kit stations are provided throughout the site to assist with spillage containment
Members of staff are trained on the use and procedures associated with spillage containment
Additional control measures
The kerosene cylinder is not adequately stored on a bund capable of containing 110% of the volume of the container
There is use of non ATEX rated electrical
appliances in close proximity to the parts wash
– when in use, there is a release of flammable vapour into the atmosphere
Identification Risk Assessment
FOCUS
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