These equipments could have saved houses where wild fires are possible. Developers should be required to install these equipments or at least backyard fire hydrants where necessary.
It just so happens I live fairly close to a company which manufactures PE piping and fittings and their largest size is 1.2metre outside diameter (OD). However, I've read that a company called Weholite supplies culvert HDPE piping and they can manufacture any size up to 3 meter OD. Weholite 750mm, 900mm and 1,050mm pipes are used in highway drainage for the collection and disposal of surface and sub-surface water so this is probably their most common range.
Yes, the event horizon is more or less spherical. I've wondered how the disk image got so popular myself. I guess it's because the scientific impressions always picture the accretion disk, and your average person just thinks it's a representation of the black hole itself. It might help with all the questions of 'what's on the other side of a black hole' if people understood it's not actually a 'hole.' They get the disk shaped idea in their head and they think it's like a portal to somewhere else, when you pass through the disk you end up in another place. Maybe if people learned to envision them as spherical they'd realize that you don't go 'through' a black hole, you go IN it.
