Selection of support height and lifting lugs for chemical processing equipment
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I’d like to ask the experts out there: 1. How much upward can the support of this device be moved? What is it based on? 2. Is it still necessary to use this type of lifting lug when the equipment is not under load?
This dimension chain is closed; the notation is incorrect. For this device, raising the ear cup a bit makes it more stable, with a lower center of gravity. Lugs are generally used to lift equipment in the air; is yours still lifted while it’s in operation? Just be careful that this lifting lug can only withstand forces acting vertically upward, otherwise it is prone to bending. You can also use a custom top lug structure, but it is necessary to calculate the lugs and perform local stress analysis.
Appendix A of the JB/T4712.3-2007 standard for ear-type supports contains detailed calculation formulas for determining how much upward movement is required. The standards for side-wall type lugs are specified in HG/T21574-2008, and the selection of lugs can be based on this standard.
The height at which the ear mount is positioned needs to be determined based on the layout of the equipment; for individual units, it can be placed anywhere as long as the strength calculations meet the requirements.
The ear-type support is placed above the equipment’s center of gravity to ensure stability. The equipment lifting lugs are only used during installation; the container is definitely empty.
Let me talk about the location of the supports: First of all, the equipment is designed to meet specific process requirements; therefore, when determining the elevation of the equipment, the building’s elevation must also be taken into consideration. Once the elevation of the equipment is fixed, it becomes possible to determine at which elevation the equipment will be installed within the building； Secondly, in terms of stress, for example in seismic conditions, it is better if the bearing and the center of mass of the equipment are at the same height, as this minimizes the eccentric bending moment ； In the case of wind load conditions, it is advisable for the height of the support to be at the same level as the centroid of the equipment’s lateral wind-facing area, as this also results in the smallest eccentric bending moment.