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| bending of L beam | |||
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| Posted by: mminford ® 06/19/2006, 16:05:41 Author Profile eMail author Edit |
We have scales to measure weight of cryogenic cylinders. We want to lower the scale by using two 2x2 x 36 long L beam for the runners and 1x1 x 3/16" thk L beams for the x-beam supports. We would like to know how many x-beam we will need to support a cylinder that weighs up to 800 lbs full. The scale platform is 36x36x3/16" thk. All is stainless steel 304. Could anyone help me with this calculation? Also, what is the strongest orientation for these L-Beams or angles? Other information:
thank you. Modified by mminford at Mon, Jun 19, 2006, 16:12:11 |
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| Re: bending of L beam | |||
| Re: bending of L beam -- mminford | Post Reply | Top of thread | Forum |
| Posted by: mminford ® 06/20/2006, 08:17:37 Author Profile eMail author Edit |
I'm sorry, I meant to say x-members as in cross-members. For some reason I cannot attach a sketch of the frame. I will try to attach it. |
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| Re: bending of L beam | |||
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| Posted by: swearingen ® 06/20/2006, 08:04:15 Author Profile eMail author Edit |
I'm having trouble picturing what you mean by an "x-beam". Can you please elaborate? A picture would be even better... |
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| Re: Re: bending of L beam | |||
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| Posted by: mminford ® 06/20/2006, 09:49:08 Author Profile eMail author Edit |
I am not able to attach a sketch. It is smaller than the 40 kb requirement. Could you possibly help as to how I can do this? thanks |
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| Posted by: swearingen ® 06/20/2006, 13:34:53 Author Profile eMail author Edit |
Are you intending to put the scale on a table made from 4 angle legs braced by smaller angle X-bracing? If so, The sizes you have given, when welded adequately, should do the job quite nicely. 2x2x3/16 angles 3' long are good for over 4 1/2 tons each in compression... |
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| Posted by: mminford ® 06/21/2006, 12:11:03 Author Profile eMail author Edit |
Actually I want to put the angle bars across the bottom of the scale as support beams. They will be in bending, not compression. To picture it (since it will not take me sketch) think of a bridge. Each angle is welded at the ends and the scale is like a platform that rests on them. I would like to know how many angle bars will hold the required weight and what orientation of the bars. Orientaion such as in a V or L or ^ shapes. thanks |
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| Posted by: swearingen ® 06/21/2006, 13:56:08 Author Profile eMail author Edit |
The best orientation in your case would be an upside down L. You want the free leg to be in tension for best performance. That said, some quick numbers tell me it's probably not going to work with 1x1 angles. Is the vessel going to be a true point load in the middle, or does it have a base ring that would hit towards the edges, i.e., the load is not in the center of the 1x1's, but towards the ends?
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| Posted by: mminford ® 06/21/2006, 14:12:02 Author Profile eMail author Edit |
I believe the cylinders have a base ring diameter of 20-26 inches. The link will give you a spec sheet of the cylinders we are using. In the dimension section it will tell you the diameter and weight of these cylinders. There is a typo for the units of the diameter, it has lb instead of in. My first calculations where that the angles would not work also. That is with a concentrated load. I am fairly new out of college and do not know how to calcualate if the beam is strong enough when the cylinder has the base ring. That is why I'm looking for other opinions. www.chart-ind(DOT)com/litfiles/10805638.pdf Thank you. Modified by Administrator at Wed, Jun 21, 2006, 19:38:49 |
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| Posted by: swearingen ® 06/20/2006, 13:35:58 Author Profile eMail author Edit |
One note: you should put some additional 1x1 angles around the upper perimeter of the table. |
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| Posted by: mminford ® 06/21/2006, 16:30:42 Author Profile eMail author Edit |
see above |
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| Bending of Angle | |||
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| Posted by: swearingen ® 06/26/2006, 06:24:04 Author Profile eMail author Edit |
With the load moved away from the center, and with some assurance that the full weight will not be placed at the middle at any time (lifting a full cylinder and putting it on the stand with one edge of the cylinder hitting the center before sliding it over to center it, for instance), then the situation gets much better. Run the numbers on that and it should work. Assume that each angle has two point loads, 1 cylinder radius from the middle, and apply 200 lbs there. Let me know how it comes out... |
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| Posted by: mminford ® 06/26/2006, 08:49:35 Author Profile eMail author Edit |
I believe that they are usually rolled onto the scales. Therefore, it is possible that the load could be placed at the center. If this is the case, do you suggest using 2x2x3/16 angles instead? You have been very helpful, thank you. |
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| Posted by: swearingen ® 06/26/2006, 13:23:47 Author Profile eMail author Edit |
Considering the variable loading, I think the 2x2's would be the prudent choice. Modified by Administrator at Tue, Jun 27, 2006, 13:52:46 |
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