Transmission Substation Electrician. Lately we've had a lot of discussions on fasteners on Oil filled and gas filled electrical equipment. It seems in most cases no springwasher or Bellville is used to join surfaces that are sealed with an o-ring or groove gasket seal. We use Bellvilles for electric connection and springwashers or pal nuts on structures. What is the reasoning for not using a some sort of positive locking fastener for sealing joints?
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