3 replies to this topic

[gtoutounji]

Hello,

I am designing a 1000 liters working volume stainless steel movable mixing tank with cooling water jacket. The jacket is dimpled and is at shell side and also at bottom dish. Can we have one zone for both areas such that the operator has to connect only one supply and one return at a comfortable height (between 30" and 60")? Aesthetic is also important so visible protruding pipes connecting the two jackets areas, side and dish, are not acceptable. Is there a way to have one zone and still preserve the round overall appearance of the tank (no pipes connecting areas, except the supply and return nozzles)?

Thank you,

[latexman]

It is probably best you contact an experienced dimple jacket vessel fabricator. At that small size you may get exactly what you want. When vessels get large, that's when you have to section the jacket for flow and pressure drop reasons. If you do not know/have a local fabricator, use your favorite search engine.

I am curious though, how do the aesthetics of this project add to the return on investment? Thanks!

[Chris Haslego]

For temperature distribution reasons, I would recommend the following:

Split the sidewall jacket in half and have an inlet and outlet on each half.

Have the fabricator bring all of the jacket inlets and outlets onto a common header so that you have one inlet and one outlet connection for the operator. The manifolding could be supported by a small rack attached to a leg or the tank itself.

This would give you the single access point for the operator, maximize the use of your heat transfer surface on the tank to minimize your heat up/cool down time, minimize your pressure losses on the utility side, and minimize your batch cycle.

If you pipe the sidewall and bottom jacket in series on the utility side, you'll likely experience temperature gradients throughout the tank, lengthen your cycle time, and have a higher utility side pressure loss. It would make it more difficult to reach a consistent batch end temperature on the tank. For example, the top contents may be cooler than the bottom.

Also, pay attention to how the nozzles on the jackets are oriented to give proper flow distribution. For example, if you come in the top of the jacket sidewall, make sure you leave the bottom on the opposite end. These jackets can also be baffled to aid in distribution as well, but on a tank your size, that may not be necessary (depending on it's height).

[gtoutounji]

Thank you both for the feedback and sorry for the delay.
Regarding return on investment, I guess with such a big company, it doesn't matter really.
The supply and return are on the same side where the operator is. The inlet is below the outlet and to its left. I guess, some kind of baffle has to be between the two to avoid shortcircuiting. I am not sure how it is done.

Thanks,