Regarding the issue with the saddle pad
Thread Content
The three conditions for a horizontal vessel gasket to serve a reinforcing purpose are that its thickness is not less than the nominal thickness of the cylinder, its width is appropriate, and its wrap angle is suitable. Regarding the first condition, for medium and high-pressure vessels, the thickness of the gasket specified in the standards may be less than that of the vessel shell; whereas for low-pressure vessels or large-diameter equipment, the thickness of the gasket may need to be greater than that of the vessel shell. Therefore, I have a few questions I would like to ask. 1. If the shimming plate does not serve a reinforcing purpose, can it be removed, provided that the cylinder and the saddle are made of the same material? 2. If, according to the standards for saddles, the thickness of the backing plate is greater than that of the cylinder, can it be chosen to be the same as the cylinder’s thickness instead of following the standard thickness?
I recommend adding shims; there is a big difference between using them and not using them.
It is generally the same thickness as the cylinder body. Unless the cylinder is extremely thick and reinforcement is required to meet the code specifications, the saddle standards shall apply in cases where no reinforcement is needed.
When the shimming plate does not serve a reinforcing purpose, what is the main difference between using it and not using it? :handshake
Make one with it added, and then make one without it, and you’ll know.
The three conditions are that the thickness must be no less than the nominal thickness of the cylinder – who told you that? You might listen to one but not the other. People* usually use gaskets that are as thick as the cylinder itself; this is done in equipment where the pressure is not very high, so that the same thickness can be used, meaning that the same type of gaskets can be utilized for ease of manufacturing. For example, if the shell is Q345R with a thickness of 16, and you calculate that the saddle pad should be 12 thick, then why add another plate that is also 12 thick just for the saddle? A large number is acceptable, so it’s still necessary to consider everything comprehensively
“The three conditions under which a horizontal container gasket serves a reinforcing purpose are that its thickness should be no less than the nominal thickness of the cylinder. Where can I find this information?
When designing horizontal storage tanks, is the thickness of the saddle pad determined by using the standard saddle thickness directly, or is it calculated?
The original poster should first carefully examine the standards for horizontal containers and the conditions under which gussets serve a reinforcing purpose. As for the issues: 1. For high-pressure, thick-walled containers, if the calculation shows that gussets do not provide any reinforcing effect, it is possible to omit them (provided that the materials are the same); however, for practical reasons related to manufacturing and installation, gussets are usually still used. 2. The standard thickness of gussets is already recommended – for example, if the table specifies a gusset thickness of 12, and the thickness of the cylinder is 14, the standard suggests using the same wall thickness; yet you still don’t choose according to this standard thickness, right? The thickness does not need to be selected according to standards; as long as the calculation is correct, it is sufficient.
If heat treatment is required for high-pressure thick-walled components, shims are also needed