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You sleeve a pipe through a wall so that if there is a gas escape in the pipe it doesn't go up the void in the wall, sealing the inside allows the gas to escape to the outside if there is a problem so you never seal both sides of the pipe but the picture in question your not sealing the inside where the pipe is passing through your looking at the crater thats around the sleeve.
In reality though if you've got a fire, a sleeve is the least of your worries.
konastab01
What’s the principle here? You can’t seal around both ends of a bare pipe through a wall because if the pipe leaks you get a buildup of gas in the void? But you can seal both ends of a sleeve on a pipe to the wall? Or just one end?