Hanger Required on Every Single Sprinkler Pipe?

In a recent discussion on threaded fittings versus welded outlets I heard that there's hanger implications - where a hanger is required for every piece of sprinkler pipe.

I'm not a designer so I apologize if this is an awful question, but is a hanger required for every stick of fire sprinkler pipe?

If there's short stubs to change direction on a branch line I would think the hanger spacing would be adequate, but I figured I'd ask the pros. Thanks in advance.

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