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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?
Sharkstar-
Seems like you can seal the sleeve to the building using whatever method you prefer and at both ends. The pipe can only be sealed on the interior end with flexible fire resistant compound.
Possibly the regs might be more concerned with the transmission of fire through the sleeve than a gas leak inside a sealed sleeve. Compartment sealing is a pretty big regulatory concern.
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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.
Airhead
konastab01
I mean your reply is very different too, theres some common sense here and from the picture there hole surround the sleeve is gaping. Yet you said the information is incorrect, it seems common sense might be not that common.