FAQ about Steel Grating - Steel & Metal Bar Grating - Beststeelgratings

We collect these frequently asked questions and help customers further understand our company and products.

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1. What standards do your steel gratings meet?
We are able to manufacture steel gratings in complaint with standards in different countries, such as YB/T.1-, ANSI/NAAMM (MBG531), BS and JJS Standards.

2. How do you control the quality of your gratings?
In order to get high quality, we introduce advanced production lines and inspection machines, strictly follow the manufacture requirements and gained countless certifications. 70% of our gratings are sold overseas, well demonstrating the superior product quality.

3. What specifications and types do you supply?
Jiulong has the manufacture ability to offer steel grating of any specifications or types. You only need to inform us your special requirements about dimensions, materials, color and anything you think we should know.

4. What’s your raw material?
Our raw materials include Q235 and A36carbon steel and stainless steel. Additionally, we can also use material that the customer appoints.

5. What’s the difference between plain grating and serrated grating?
The serrated grating possesses better anti-slip performance but higher price than plant grating, widely used in petrochemical engineering.

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For more information, please visit Shunbo Steel Grating.

6. What’s the surface treatment?
The surface treatment includes hot-dip galvanization, painting, electrostatic coating or non-treatment.

7. What does length and width exactly refer to?
In a grating, the length means the length of bearing bar while width means the length of cross bar. When you place an order, please make the dimensions clear and avoid mistakes.

8. How do you calculate the area of each grating?
a. For regular shape grating, the area equals to length multiplied by width of grating, including the area of holes and notches.
b. For irregular shape grating, the area is that of the steel grating before cutting, instead of the area of irregular shape grating.

9. Why should we offer the structure drawing and detailed parameters of the work site?
This is a requirement for better servicing you. Based on your structure drawing and parameters, we design and offer a grating perfectly suits your work site and ensure no extra cutting while usage. It greatly simplifies the installation work and saves your time. What’s more, according to the information you offer, we can recommend you the best suitable grating, which will save you time and money. We can also avoid the confusion between length and width mentioned in Q7 and prevent unnecessary economic loss for you.

10. Do you accept rush orders?
If the order requires 30% of our raw materials, we will accept your rush order. We will use four pressure welding machines and assign three teams of workers. For hot galvanization, we have built a galvanized pool.

I have a client wanting to use a lift truck to move pallets around the second floor. The floor is currently just steel grating. The lift truck and pallet together are about lbs which equates to a distributed load of about 605 psf. I calculated the grating can only withstand 250 psf. The idea would be to place diamond tread plste on top to provide the extra strength. I found some load tables for this, and it looks like the capacity is 521 psf for 5/8" plate at my 4' span.

By combining these capacities, am I being overly conservative? Could the diamond plate be assumed to have a shorter effective span because it's being supported by the grating?

dik said: You can get stuff that works...

Changing the grating isn't an option. That's why the idea to add tread plste was introduced.

SWComposites said: I don’t think you can sum the strength capacities

human909 said: It sounds like you are out of your depth if you think that by simply laminating spanning members you can sum their capacities.

Perhaps "combining these capacities" wasn't the correct phrase to use. I didn't simply sum 250+521 and call it good. I calculated the section modulus for the tread plate and combined it with the grating to have a sort of built-up section. Do you disagree with this? Unless you are rigidly connecting the two sections via welds, clamps, bolting, etc. then you cannot combine the section modulus for the built-up section. The built-up section has to be connected to transfer the shear flow and stresses to extreme fiber if you are going to credit the combined section.

The relative stiffness of the two sections have to be analyzed. You can use the force method to calculate the load distributed to the grating and plate for a unit width. The stiffer section will take more load and you can throw the equations in excel and goal seek to determine the maximum allowable load until one of the sections reaches its maximum allowable stress and that will be the limiting factor. Hope that helps. You have to connect the two compositely and hope that the combined strength works. There could be several issues due to the inadequacy of the initial grating. You might be far further ahead if you use new grating intended for the purpose.
----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

ETX said: The built-up section has to be connected to transfer the shear flow and stresses to extreme fiber if you are going to credit the combined section.

I agree. I planned to have them weld the plate to the grating, but I'm realizing now I should probably check with them to make sure they are even able to do this. I'm thinking it's going to be more economical to just put a 3/4" plate down, but then comes the added weight consideration. I really appreciate the advice!

dik said: There could be several issues due to the inadequacy of the initial grating. You might be far further ahead if you use new grating intended for the purpose.

I think I'm beginning to see this is the case. Either remove and replace the grating, or get tread plate that's thick enough to carry it alone. Just a lot of steel to be added in the case of the latter. Converting the truck and load to a distributed load is not enough. The wheels are going to be small, concentrated and hard. Forklift loads are actually much more severe than HS20. Here's a sheet out of the Grating Pacific Catalogue showing spans for different type of grating and loadings. Maybe if you build up your grating with plates welded to it until it matches an acceptable section property or replace the grating with one with a tighter spacing. Note that the grating gets very deep, very fast, especially for a 4'-0" span.
If you're out of options, saying "no, take the loads a different way" is an answer.  https://files.engineering.com/getfile.aspx?folder=be006a42-eca2-408b--c5f&file=.pdf