GE GL 311 F3/4031 P/VE, Operating Instructions Manual

Page: 79 / 146

I
NSPECTION AND
M
AINTENANCE
REV7
/REV3
OI 250 (EN)
79 / 146
9.3.4 Checking the Gas Quality
Take a gas sample and check for compliance with the limits.
- Dew point:
≤ -5°C
1)
- SF
6
conten
t
:
≥
97%
- Acidity (SO
2
): < 180 ppmv
2)
1) Based on the operating pressure and 20°C.
2) Measurements earliest perform three days after a short circuit.
The required measuring and testing equipment is listed in
(see
“Tools and Auxiliary Equipment” on Page 117)
.
9.3.5 Checking the Contact Resistance
• Check the contact resistance as described in the commissioning
section.
9.3.6 Checking the Operating Times
• Check the operating times as described in the commissioning
section.
9.3.7 Checking the Threaded Connections
• Check all accessible threaded connections (screwed or bolted
joints) to make sure they are tight.
The tightening torques are given in the following sections:
- Installation
- Commissioning
- Troubleshooting
- Reconditioning