Equipment end of life
Instructions on the handling of used SF
6
gas
and decomposition products
G81--001EN03
4/4
02--2011
© ALSTOM 2010. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be
relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is
strictly prohibited.
GRID
Recapitulation of important instructions
Reminder
Pure, non--contaminated SF
6
gas is non--poisonous. Electrical discharges
and fault--switching arcs will give rise to different grades of poisonous
decomposition products. In small amounts gaseous decomposition products
produce -- within seconds and before any poisonous effects can take place
-- warning symptoms, such as an unpleasant piercing odor, nasal, mouth and
eye irritations, which enable working personnel to withdraw to safety. Solid
decomposition products (powdery residues from switching) can cause skin
irritations. SF
6
is about five times heavier than air, and in the absence of
turbulence, results in the gas collecting just above ground level and causing
suffocation through a deficiency of oxygen.
Important
instructions
The table below recapitulates the important instructions to follow at the time
of handling of used SF
6
gas and decomposition products :
No.
Instruction
1
As soon as an unpleasant, piercing odor from decomposition products
becomes perceptible leave the substation room without delay. enter
the room only after thorough ventilation or when wearing suitable
oxygen breathing masks (with filtering or fresh air device).
2
After disturbances, enter the substation room only after having
thoroughly aired the room or when wearing independent of
ambient--air operating oxygen breathing masks, or alternatively, after
verifying by measurement that the ambient air contains at least 17%
volume of oxygen, especially if, one has to reckon with the
concentration of SF
6
in hazardous amounts.
3
Enter rooms located below, and connected with the substation--rooms
after thorough ventilation only, or when wearing oxygen breathing
masks which operate independent of the ambient--air, or alternatively,
after having verified by measurement that the ambient air contains at
least 17% volume of oxygen.
4
Ensure that the room ventilation operates satisfactorily, whilst
maintenance work is being performed on SF
6
switchgear (discharging
and filling of gas, opening and cleaning of equipment).
5
When working on opened SF
6
switchgear protect skin against contact
with gas and avoid swallowing or inhaling of gas. Ensure body, clothing
and work--bench cleanliness. Wear special work--overalls and after
completion of work discard latter.
6
Wash skin which comes in contact with powder deposits with plenty of
water. Before work--breaks and after work wash face, neck, arms and
hands thoroughly with soap and plenty of water.
7
Do not stir--up powder deposits resulting from arc--switching. Remove
sticky powder with dry rags. Use suitable vacuum cleaner with
paper--filter to remove loose powder. Discard used items and
filter--bags in such a manner that powder deposit does not spread.
Before discarding neutralize used items.
8
Avoid eating, drinking and storing eatables in rooms with opened SF
6
switchgear which contains powder deposits.
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