Commissioning
Pre--commissioning inspections
L34--004EN/04
2/6
04--2004
E ALSTOM
SF
6
gas
Reminder
SF
6
envelopes are at rated pressure following the SF
6
gas filling operation.
Parameters
Take note of parameters below :
D site altitude, in meters,
D atmospheric pressure of site in kPa,
D site temperature in °C.
Checking SF
6
gas
SF
6
pressure values must obligatorily be read on the pressure inspection
gauge (tooling). Pay no attention to indications given by the dial
densimeter on the filling control block (where applicable) ; it is not accurate
enough for this inspection.
See the module “Calculation of the SF
6
gas filling pressure to using the
pressure gauge (tool)”.
The table below gives the steps of checking :
Step
Action Comment
1 Measure SF
6
gas pressure by
means of the pressure inspection
gauge (tooling)
Follow the instructions given in
module ”Filling with SF
6
gas”.
2 Correct pressure found. Follow the instructions given in
module ”Calculation of the SF
6
gas filling pressure to using the
pressure gauge (tool)”.
SF
6
gas
humidity level
TheSF
6
humidity level need not be knownas theequipment is fitted withmo-
lecular sieves in sufficient numbers to give a dew point lower than, or equal
to, 0°C at an ambient temperature of 20°C, for an apparatus filled to its rated
pressure for 2 or 3 months.
Checking tightness
of assemblages
under SF
6
pressure
Each on site assemblage of parts subjected to SF
6
gas requires seals. The
quality of these assemblages must be checked.
This inspection should be undertaken once all the filling and pressure control
operations are finished.
Execute this checking according to instructions given in module ”SF
6
gas
monitoring”.
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