Building Overhead Hoist: Is 5"x5"x1/4" Wall Sufficient?

[Gulfstream550]

TL;DR

Overhead hoist system

Hello, I am in the process of building an over head hoist in my shop.I've already taken delivery of the metal, so I hope I erred on the side of safety. I am spanning 20' and will be using a 1/2 ton electric hoist and trolly. I found a chart online from Harrington Crane Co. That specified that a W8x18.4 would be sufficient . What I couldn[t find was what I needed for support. That said, I am using 5"x5"x1/4" wall thickness for the columns. Am I safe??

 

[berkeman]

Um, you're posting on the Internet asking if your design is safe? What may be wrong with this picture? Will your 4 year old son be playing on the ground below the hoisted objects?

 

[Gulfstream550]

Um, you're posting on the Internet asking if your design is safe? What may be wrong with this picture? Will your 4 year old son be playing on the ground below the hoisted objects?

Dang, I'm sorry, didn't mean to post in the washing machine repair thread. Bad me:)

 

[berkeman]

LOL. What is your design/engineering background? Is the shop your personal garage or your work shop?

 

[Dr.D]

This is a dangerous thread and should the terminated. Anyone who has to ask such questions is by definition unqualified to make the design.

 

[berkeman]

This is a dangerous thread and should the terminated. Anyone who has to ask such questions is by definition unqualified to make the design.

Done. Thank you for the second opinion, Doctor.