Static Electricity Static Energy Static Charge
Hazards & Control
HEIGHT WORK PICTORIAL TRAINING | PART 2
ELIMINATION OF WORKPLACE HAZARDS
Static Electricity Static Energy
Static Charge Hazards & Control
One the unknown hazard present in the
industry is, Static electricity is an electrical charge that cannot move. It is
created when two objects or materials that have been in contact with each other
are separated. When in contact, the surface electrical charges of the objects
try to balance each other.
The key hazard of static electricity
is the creation of sparks in an explosive or flammable atmosphere.
These sparks can set off an explosion or fire. The danger is greatest when flammable liquids are being poured or transferred. For static electricity to be a hazard, four conditions must be met:
HOT WORK PERMIT TO WORK ( PTW )
1. There must be a means for a static
charge to develop
2. Enough energy must build up to
cause ignition
3. There must be a discharge of this
energy (a spark)
4. The spark must occur in an
ignitable vapour or dust mixture
Static Electricity Static Energy
Static Charge Hazards & Control
Control for Static Energy Static
Charge Hazards
Many control is available for the
same, Most static electricity control measures provide ways for the static
charges to dissipate harmlessly
before sparks occur. Some ways to
prevent static charges from accumulating on materials are:
.. bonding and grounding
.. humidification
.. static collectors
.. additives
Static Electricity Static Energy
Static Charge Hazards & Control
TOOLBOX TALK MEETING TRAINING PROCEDURE -
Bonding and grounding
It’s the key requirements. Bonding and grounding are common controls for static electricity. Bonding is connecting two or more conductive objects with a conductor, such as a copper wire, that equalizes the potential charge between them. Bonding is also connecting various parts of equipment and containers that are electrically separated by, for example, gaskets or caulking compounds. Note that bonding does not eliminate the static charge.
Grounding is connecting one or more conductive objects directly to the earth using ground rods, cold water copper pipes, or building steel. Unlike bonding, grounding drains the static charges away as quickly as they are produced.
A designated ground source is
preferred. Connectors for bonding and grounding, such as
copper wire and clamps, must provide a
good conductive path.
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