【Daily Question】【AC Version for Static Equipment...Question 75】March 16, 2019...Essay question...Everything is going well
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This post was last edited by kareale88 on 2019-3-16 at 20:44: bg4.png【Daily Question】【Static Equipment Discussion Forum...Question No. 75】 March 16, 2019...Question-and-answer format...Everything is going well...........................................................................Reward rules: 2 wealth points for participation, and 8 wealth points for each correct answer. ........................................................................... What considerations should be given to the junction between the skirt and the head when the temperature of the equipment is very high? How should the placement of air barriers be considered when thermal stress is high? Answer: The gas barrier ring merely **reduces the impact of temperature difference stress on the weld; under suitable conditions, it is advisable to conduct temperature field and fatigue analyses to ensure the safe operation of the equipment.**
This post was last edited by yechao25038 on 2019-3-16 11:18. When the temperature of the equipment is very high, insulation needs to be added to the skirt.
When the design temperature of the lower head of a tower-type vessel is greater than or equal to 400°C, an air barrier ring should be installed above the skirt near the head. At high temperatures, significant local stresses occur at the junction between the skirt and the head; therefore, for equipment operating at temperatures above 400°C, an air barrier is installed in the structure to reduce the temperature difference between these two parts, thereby eliminating stress.
The air barrier merely **reduces the impact of temperature difference stress on the weld; where possible, it is advisable to conduct temperature field and fatigue analyses to ensure the safe operation of the equipment.**
The air barrier merely **reduces the impact of temperature difference stress on the weld; where possible, it is advisable to conduct temperature field and fatigue analyses to ensure the safe operation of the equipment.**
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When the operating temperature of tower equipment is high or there are significant temperature fluctuations, it exacerbates the stress conditions on the welds that connect the skirt to the head; therefore, insulation should be provided for the skirt. When the design temperature is 400 degrees or higher, an air barrier should be installed to alleviate excessive thermal stress differences. The position of the air barrier ring is related to the diameter of the bottom tower; the larger the diameter, the lower the air barrier ring is placed, in order to create a larger space for it. For critical equipment, to ensure its safe operation, temperature field and fatigue analysis are preferably conducted when conditions permit.
The air barrier merely **reduces the impact of temperature difference stress on the welds; where possible, it is advisable to conduct temperature field and fatigue analyses to ensure the safe operation of the equipment.**
At high temperatures, significant local stresses occur at the junction between the skirt and the head; therefore, for equipment operating at temperatures above 400°C, a gas barrier ring is installed in the equipment structure to reduce the temperature difference between these two components. The gas barrier ring should be placed at the upper part of the skirt cylinder, near the head, in order to minimize the temperature stress at the weld joint where the lower head meets the cylinder.
The air barrier merely **reduces the impact of temperature difference stress on the weld; where possible, it is advisable to conduct temperature field and fatigue analyses to ensure the safe operation of the equipment.**