tig welder: risk assessment

originally by mwalters, adapted from wiki.ehlab.uk/tigwelder_riskassessment

Closes #50

Author: tcmal

syllabuses/Workshop/TIG Welder/risk-assessment.md

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+# TIG Welder
+
+## Fire
+
+### Severity
+
+H
+
+### Likelihood
+
+L
+
+### Risk rating
+
+M
+
+### Who may be harmed & how
+
+The space, and any users in it
+
+### Control measures
+
+  - Users must clear the area of flammable materials before any welding takes place
+  - Metal welding table installed, walls/conduits shielded
+  - Fire extinguisher installed in the welding area
+
+## Fumes
+
+### Severity
+
+M
+
+### Likelihood
+
+M
+
+### Risk rating
+
+M
+
+### Who may be harmed & how
+
+Users, and other people in the room may breathe harmful fumes from the welding process.
+
+### Control measures
+
+  - Users trained to prep and clean their workpieces, reducing fumes.
+  - Large extractor fan installed beside the welding area and is capable of cycling the room air once every 70 seconds
+
+## Gas bottle falling over
+
+### Severity
+
+M
+
+### Likelihood
+
+L
+
+### Risk rating
+
+M
+
+### Who may be harmed & how
+
+Any person nearby. If the valve were damaged, cylinder could become a projectile.
+
+### Control measures
+
+  - Only cylinders that have been inspected for safety and come from a reputable supplier can be used.
+  - Gas bottle should be chained to wall, out of the way
+
+## Burns from hot objects
+
+### Severity
+
+M
+
+### Likelihood
+
+M
+
+### Risk rating
+
+M
+
+### Who may be harmed & how
+
+User, and possibly others nearby, may suffer burns from handling hot objects.
+
+### Control measures
+
+  - Users trained to use appropriate tools and PPE, and to leave the area safe for other users
+  - Signage installed to remind others there may be hot objects left there
+
+## Oxygen depletion from compressed gas release
+
+### Severity
+
+H
+
+### Likelihood
+
+L
+
+### Risk rating
+
+M
+
+### Who may be harmed & how
+
+Any person in the room may suffer from asphyxiation.
+
+### Control measures
+
+  - Amount of gas in the room is limited to ensure oxygen levels remain safe, even after accidental release.
+  - Ventilation installed
+  - Appropriately sized gas cylinders to be used - see wiki.ehlab.uk/tigwelder:oxygen
+
+## UV Radiation Exposure
+
+### Severity
+
+M
+
+### Likelihood
+
+L
+
+### Risk rating
+
+M
+
+### Who may be harmed & how
+
+User and other persons nearby may suffer eye/skin damage.
+
+### Control measures
+
+  - Users trained to use appropriate PPE
+  - Welding curtain installed, users trained to use it.