I want to use 4 rectangular hollow ms pipes 40*25*2 mm. 25 mm vertical use. All 4 pipes will be equally spaced between a width of 490 mm. The length of pipes is 1390 mm, with these 4 pipes resting on similar rectangular pipes at both ends. They will be bolted with 2 nut bolts at both end each.Total load will be 300 kgs resting on a length of 1310 mm.4 vertical square hollow ms pipes are provided. 40*2 mm. Height from floor is 135 mm
Will this structure hold weight and not sag at any point.
Ms Rack for batteries
metal
Related Solutions
Normally gym equipment is powder-coated. in your picture, they have used an electrostatic powder coating process and finished with a sort of hammertone finish..
IMO- your options are as follows:
- Stainless steel is the best metal in terms of durability. it will never rust, however, its more expensive and is slightly harder to drill/bend. I would recommend pricing the bench with Stainless, then you can assess the viability. In terms of stainless, the most common stainless is 304, which is industry grade.. This grade is perfect... but will turn slightly yellow over time, if you are concerned with tarnished stainless you can go for the more expensive 316 stainless.
Mild Steel is your other option, and obviously this will rust, so your rust prevention options are
- Metal Oxide primer with enamel coating (paint)... which will not look as clean and will rust after a short time
- Powder coating - you can imagine this as a sort of plastic coating which is baked onto the metal. in terms of finishes. this looks really neat, however the impact of the power bar on the bench will chip away the coating and it will show signs of rust after a while. not to mention that the coating is only on the outside of the tubing and the tubing will rust on the inside.
Chrome is another option, in which the metal is coated in chrome, this is also on the exterior of the metal, but I am not too certain if you will find a person who can chrome such a large item
Your last option (and most cost effective) is to galvanize the metal. this results in a zinc layer being coated on all surfaces of the metal (inside and outside) your second photo looks like it has been hot-dipped galvanized. the galvanizing will look really shiny at first, but will form a dulled coating and will last for many years.. Galvanizing comes in two types
- Hot dipped , where your bench will be dropped into molten zinc and will come out with a thick layer of zinc covering all surfaces. with this your bench will last for 20+ years without rusting.
- electrogalvanized, where the bench is dipped into a solution and a current creates a charge which attracts the zinc coating (this coating is a lot thinner so will not last as long), however the finish is a lot prettier. I would not recommend this in your case.
So to summarize, I would say your options are stainless steel, or hot-dipped galvanized steel. Both will be extremely durable but I like the look of stainless more
If you decide on Galvanized, I would also place some rubber strips in the areas where the power-bar lands on the bench, since the zinc coating will wear away there over time.
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Best Answer
It will sag. This is known as "deflection", and is known for various materials and cross-sections, including your steel pipes.
https://www.engineering.com/calculators/beams.htm
Scroll down to "Hollow rectangular beams" and enter your numbers. Unfortunately, this calculator is in inches, but it's easy enough to convert.
Your 300kg mass would cause a deflection of 17.25" or 438mm, but that is based on a single 300kg mass placed on a single tube. In reality, your load will be spread out more, right? If it is evenly spread over all 4 of your pipes, then one pipe has to carry 300kg/4 = 75kg, which would result in 1/4 of that deflection, or about 4.3" or 110mm.
These are just estimates, as the specific material and how you load your shelf will make a difference.
To improve on (reduce) the deflection, you have the following basic options: