Maximum equipment weight and weight with water filled

The maximum weight is the weight of the device itself plus the weight of the attachments, while the weight with water filled is the weight when the device is filled with water for a hydrostatic test

The weight of the device itself is called \"empty weight\", while the weight of the device together with its attachments is called \"gross mass\"

One is the weight of its own mass, and the other is the weight of its own mass plus the weight of the water.

We generally design three weights: the device’s own weight, the weight of the water filled in it, and the weight associated with operation. It’s not really clear what this maximum mass (weight) is.

According to the official standard \"TCED 41002-2012 Technical Requirements for Chemical Equipment Drawings\" (2012 edition), only the maximum mass of the equipment is specified; there is no concept of weight when the equipment is filled with water. . It’s clearly stated that the maximum mass refers to the highest weight used during the hydraulic test. If water is used for the hydraulic test, then the maximum mass is equal to the weight of that water. However, if a medium with a higher specific gravity than water is used in operating this equipment, such as a salt solution, then the maximum mass is the weight associated with using that medium. . . In short, the larger of the two is taken as the maximum mass; it’s clearly stated in the explanation. . It should be noted that in some towers, there are devices subjected to eccentric loads and wind loads, so the effect of such eccentric loads also needs to be taken into account. . . See the figure below. . (The eccentric load is indicated in the red box.) In fact, if the original poster asks those who are involved in equipment design, everything will become clear. .

This post was last edited by arpcd on 2017-9-7 at 17:30. According to the \"TCED 41002-2012 Technical Requirements for Chemical Equipment Drawings\" (2012 edition), only the maximum mass is specified; there is no concept of weight when the equipment is filled with water. It is explained very clearly: if the medium used for the hydraulic test is water, then the weight of the water filled in equals the maximum mass. If the density of the medium used during equipment operation is greater than that of water (when the tank is completely filled), then the operating weight at that time is the maximum mass. It’s easy to understand. . It should be noted that some tower-type equipment is quite tall, so the maximum weight requires consideration of eccentric loads. . . See screenshot:

The poster has posted this in the wrong place; it should be sent to the Equipment Design section, as that’s the area for those who specialize in equipment design – they are much more experienced in this field. . .

I would like to ask: when calculating the weight of the medium, should we consider the weight at the normal operating liquid level or the weight when the medium fills the container? Is there any standard or specification that specifies this clearly?