Gas insulation apparatus
A gas insulation apparatus includes: a tank that includes a flange surrounding an opening and in which an insulating gas containing oxygen is enclosed; a lid that covers the opening; a bolt that fixes the lid to the flange; and a sealing member that is sandwiched between the flange and the lid, in which the sealing member includes a first O-ring that surrounds an entire circumference of the opening, and a second O-ring that surrounds the first O-ring, the first O-ring is made of fluorine-based rubber, and the second O-ring is made of ethylene propylene diene-based rubber.
1 . A gas insulation apparatus, comprising:
a tank that includes a flange surrounding an opening and in which an insulating gas containing oxygen is enclosed;
a lid to cover the opening;
a bolt to fix the lid to the flange; and
a sealing member that is sandwiched between the flange and the lid, wherein
the sealing member includes a first sealing member that surrounds an entire circumference of the opening, and a second sealing member that surrounds the first sealing member,
the insulating gas is enclosed in the tank at a pressure higher in oxygen partial pressure than atmospheric air,
the first sealing member is made of fluorine-based rubber,
the second sealing member is made of ethylene propylene diene-based rubber, and
at least one of the first sealing member and the second sealing member is an O-ring.
2 . The gas insulation apparatus according to claim 1 , comprising a silicone sealant layer that is provided between the flange and the lid, the silicone sealant layer surrounding the second sealing member.
3 . The gas insulation apparatus according to claim 2 , wherein the silicone sealant layer is formed in a hole through which the bolt passes in the flange and the lid.
4 . The gas insulation apparatus according to claim 1 , wherein one of the first sealing member and the second sealing member is a packing.