What are the potential risk factors of not using welding pads on ladder platforms?
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Our equipment has a diameter of 2200, a height of 40m, a wall thickness of 12mm, and is made of 20R material. When constructing the ladder platform, the design institute said that it was not necessary to use shims; the ladder platform should be welded directly to the tower wall. What do other designers think? Additional information: This equipment does not require heat treatment; the operating temperature is 60 degrees, the pressure is 0.6 MPa, and factors such as wind load can be ignored. This post was last edited by mzykater on 2007-12-10 09:35
Design pressure, temperature, wind load, and snow load – please explain. If these values are low, it’s completely fine
I think that with different materials, it’s still best to have them; sometimes equipment requires heat treatment, and that’s when they’re needed as well. Of course, if there are no special issues with the device, then there’s no need for it. This post was last edited by Wen Bing on 2007-12-10 09:03]
Principle regarding whether gaskets need to be installed between the attachments connected to the equipment and the tank during equipment design: 1: Containers that require heat treatment, low-temperature containers. 2. Between dissimilar steels. Under normal circumstances, transition shims are not required for containers other than those mentioned above.
To add to what was said above, for thin-walled containers, if gusset plates are not used, local stresses may become too high, causing the shell to be pulled or crushed.
In terms of stress, as long as the welding quality of the supports for the platform escalator and the outer wall of the equipment is satisfactory, there are no issues with the stress on the escalator itself. What needs to be considered is that during installation and maintenance, people walking on it create a bending moment at the junction between the platform supports and the equipment’s outer wall, which leads to localized stress and deformation. This becomes a problem when the thickness of the equipment wall is small; 12 mm, as mentioned by the poster, should not pose any issues, but it’s still advisable to check the localized stress in that area and provide specific data to support this. In addition to the situations mentioned by the two people above, it’s also possible that when the equipment has an inner lining, there may be requirements regarding the deflection of the wall panels during installation – that is, if the deformation of the wall panels exceeds a certain limit, it could damage the inner lining. In such cases, it’s necessary to check the localized stress and deflection at the joints of the wall panels to ensure safety.