Jacket insulation
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I’d like to ask my fellow Sichuanese friends: when it comes to jacket insulation, which is more ideal – steam entering from above and exiting from below, or steam entering from below and exiting from above? Why? Will the condensate water retained in the lower and upper sections of the area affect the insulation of the jacket?
If saturated steam is used as the insulation medium, it is advisable to design the equipment jacket with inlet at the top and outlet at the bottom, to facilitate the discharge of condensate. If the insulation (cooling) medium used is water. Try to use a structure with flow from below to above, as this facilitates adjustment and control. For reference!
The risk of water hammer is high, and drainage is difficult.
For jacketed pipelines used to transport liquid sulfur, the flow should be from top to bottom; otherwise, liquid may accumulate inside the jacket, causing the temperature to drop and ultimately leading to the solidification and blockage of the liquid sulfur within the pipeline. This post was last edited by Clauspolunit on 2009-2-24 16:41]
What I’ve seen is that they’re arranged with the upper part on top and the lower part below; I guess it’s mainly due to what the people upstairs said: condensate can be drained more easily, which reduces its impact on temperature regulation
Generally, the temperature of steam entering from above is higher than that entering from below, especially under conditions above 100 degrees
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Steam is introduced from above and discharged from below, which facilitates the removal of steam condensate； If the lower part is connected to the upper part in this manner, there is basically no heat transfer, and water hammer can easily occur in the jacket, shortening its service life; moreover, thermal energy cannot be utilized effectively.
I’ve never seen a setup with steam tracing and exhaust pipes in this configuration; it tends to cause water hammer problems
This is related to whether insulation or heat retention is desired, as well as to the phase state of the insulating material; it is based on the principle of facilitating liquid drainage or preventing the formation of air pockets. The second floor explained this very clearly
I’ve only seen designs with water flowing from above to below; that’s what I observed in several factories. With water flowing from above and out below, using steam to heat the water seems to help maintain temperature better. However, the problem is that this setup makes it seem like a bathroom where water is being boiled, and the noise generated can be quite loud. Moreover, such intermittent water flow is likely to cause significant damage to the equipment’s jackets and enamel coating. In my opinion, it’s better to use the traditional design with water flowing from above to below. If maintaining temperature is a concern, using hot water for insulation works as well; all that’s needed is an additional hot water tank and a centrifugal pump
Steam is usually allowed to flow in from above and out from below, while hot water flows in from below and out from above; this approach yields good heat exchange efficiency.
For our sulfur pipeline insulation steam jacket pipelines, the flow is from top to bottom; it seems that when the insulating medium is liquid, it flows from bottom to top, so that the insulating medium can fill the jacket completely.
Water enters from above and exits from below, facilitating the drainage of condensate water