powerstroke73L
ArboristSite Operative
Most 100lb tanks I've seen use 1/8" steel. With proper gusseting you'd probably be ok. I used a 100lb propane tank to create a "sucker" tank for waste vegetable oil. I use a vacuum pump to pull about 25" of vacuum on the tank which requires pretty stout construction. 15-16" of vacuum will easily collapse a steel 55 gallon drum.
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