Confined Space
The following are some texts lines taken from the toolbox talk uploaded by QHSE Documents:
- Entry into any confined space is a very critical job and potentially dangerous due to the severe possibility of oxygen deficiency, improper access and egress, presence of flammable gas, hydrogen Sulphide, or other toxic substances or contaminations.
- Don’t enter a confined space until an Entry Permit has been issued and authorized by the concerned asset owner in consultation with Occupational Hygienist and or competent certified gas tester.
- A confined space includes tanks, drums, large piping, manhole, pits, or any enclosure that may contain flammable & or toxic substances or an oxygen-deficient environment.
- Any trench deeper than 1.5 meters (e.g. excavation, pit, and sump) should be considered a confined space.
- All confined spaces must be ventilated properly and have a constant flow of air to be maintained. Air blowers can be installed if mandatory.
- Gas tests are essential/necessary before authorizing and issuing an entry permit. The gas tests must contain the Flammable (combustible gas, Oxygen content, and Toxic substances that may be present, such as carbon monoxide, or hydrogen supplied.
- Gas test limits for a normal vessel entry are oxygen content of more than 19.5%, combustible gas at 0% LEL, and hydrogen Sulphide at O parts per million.
- If gas test results are out of the normal range, then special equipment such as respirators, protective clothing, and forced air ventilation will be required
- The results of gas tests and any special precautions must be recorded on the entry permit
- The frequency of gas test in confined space shall be indicated on the entry permit by the competent authorized gas tester and Occupational Hygienist
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