Siemens 8DB10 - Procedure for bolted joints and seals

Servicing
204/214 Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
Maintenance
recommendation
44.4 Procedure for bolted joints and seals
Please observe the following procedure for maintenance of switchgear parts with bolted
joints:
➭ Recommendation: Always replace the spring elements on loosened bolted joints.
Please observe the following procedure for maintenance of switchgear parts with seals:
➭ Always replace removed toroidal sealing rings by new ones. Toroidal sealing rings can be
obtained from your regional Siemens representative.
➭ Clean the sealing surfaces and grooves in the flanges with a lint-free cloth.
➭ Check the sealing surfaces before installation.
➭ Grease the toroidal sealing rings and place them in the grooves of the flanges.
➭ If required, place desiccant bags in the cover.
➭ Mount the cover.
➭ Bolt the flanges tight cross-wise with the hexagonal bolts M8 with new spring elements.
Tightening torque: 20 Nm.
DANGER
Danger of suffocation! SF
6
gas is heavier than air and concentrates first near to the floor and in
floor openings.
➭ Do not let SF
6
gas get into the environment.
➭ While working with SF
6
gas, provide for sufficient ventilation.
➭ After working with SF
6
gas, vent the cable basement and any hollows in the floors with
special care.
➭ Observe the safety data sheet for SF
6
gas.
➭ Cover or barrier adjacent live parts.
➭ To be done generally before working with SF
6
gas: Check and document reusability (dew-
point, gas quality) of the SF
6
.
Visual
check
Status
inspection
Maintena
nce
XXXCheck and document SF
6
gas pressure (see page 44, "Insulating gas SF
6
")
XXCheck and document dew-point (humidity content) ( ≤ –15° C)
XXCheck and document gas quality (air content) (SF
6
share ≥ 95 %)
X Check operating mechanism and interlocking of disconnector and earthing switch
(if required, grease linkage and bearings)
X Vacuum circuit-breaker operating mechanism
X In all gas compartments, if gas has to be exchanged or upon reaching the number of operating cycles:
➭Evacuate SF6 gas.
➭ Replace desiccant bags.
➭ Replace toroidal sealing rings.
➭ Fill in SF
6
gas.
➭ Check and document gas pressure.
➭ Check tightness.