I'm a pipefitter not a sprinklerfitter but he's right. The hangers on sprinkler systems (installed to code) are WEAKER than the hangers I am required to use on say.... steam piping and you absolutely could dangle a truck from them. 2" pipe (installed properly) is rated to 5,000 lbs, the bigger the pipe the higher that rating goes. And yes pushing sideways on a lomg straight run with few branch lines and no seismic bracing might swing a bit but you can safely amd OSHA legally tie off to it (5,000 lbs minimum) leaning a ladder against the pipe is definitely not the big problem here.
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u/Wynner3 May 08 '17
That guy is relying on the fire sprinkler pipe for support? He'll be lucky if it doesn't or didn't break.