Seeking assistance with SW tower skirt parameters
Thread Content
I’m not clear on some parameters related to the calculation of SW Rita vessels; I hope someone experienced can give me some guidance: (1) Design temperature of the skirt; (2) Inner diameter of the bottom cross-section of the skirt; (3) Nominal thickness of the skirt. Thank you all.
This post was last edited by HSLJHZ on 2017-1-26 08:28. I understand the original poster is asking about the calculation of towers in Sw6. 1. Design temperature of the skirt: normal temperature is adopted, with a transition section provided at the lower head. 2. Inner diameter of the skirt base cross-section: For a cylindrical skirt, the inner diameter of the skirt base cross-section is equal to the diameter of the tower body ； In the case of a conical skirt, the inner diameter of the skirt’s bottom cross-section is larger than the diameter of the tower body. For the specific structure, see NB/T47041-2014. 3. Nominal thickness of skirt seat: See NB/T47041-2014.
Should the skirt seat be at room temperature? If a tower is designed for a temperature of 280 degrees, using material Q345R, then according to the standards, the skirt section should also be made of Q345R – so where would the transition section come from?
When the skirt base is not high and the length of the skirt base cylinder is short, the design temperature for the skirt base is set at the temperature of the tower bottom. In cases where the temperature is neither low nor high and the skirt base is high, a transition section is present in the skirt base cylinder; the design temperature for this transition section is determined based on the temperature of the tower bottom, while the design temperature for the skirt base itself is based on the ambient temperature.
I have worked on a tower project where the owner required a base of 10 meters in height. Both the tower body and the base were made of Q345R material. Should the design temperature for the base be set based on the ambient temperature?
The answer on the second floor is incorrect; it has already been explained below that the design temperature for skirt seats should not always be taken as room temperature, but rather as the local ambient temperature. I usually use a value around 10-20. If the equipment reaches high temperatures, the specific temperature should be determined in accordance with relevant standards. In such cases, a transition section is necessary. The design temperature should correspond to that of the tower itself; not all towers require a transition section. The other two issues aren’t serious
This post was last edited by HSLJHZ on 2017-1-26 08:29. Inner diameter of the bottom cross-section of the skirt: In the case of a cylindrical skirt, if the inner diameter of its bottom cross-section is smaller than the diameter of the tower, it refers to the inner diameter of the ring plate at the bottom of the skirt.
The inner diameter of the bottom cross-section of the skirt is equal to the diameter of the tower body, and the skirt is joined to the lower head. See Clause 6.3 of NB/T47041-2014.