The view from the rear of small U-Bundle shows how each tube makes a bend and then returns to the tubesheet. It is called a 2-pass bundle because a divider plate keeps the steam entering from one side of the tubesheet and it makes one pass down the length of the bundle and then the second pass back to the tubesheet.
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These are good when the product inside the tubes doesn't creat a lot of fouling because they are not easy to clean due to the bends in the tubes. The stresses on the tubesheet are obviously different than those associated with straight tubes.
This is drawn by Solid Works which we just received. Our drafting department has been using AutoCAD and tried AutoCAD 3D, but it was too slow because too many commands had to be typed in. The Solid Works seems to be good and much faster, but they are still learning on it. This was the first tube bundle we drew here. I don't get a copy of the Solid Works to play with because it is too costly and they will not use unlicensed copies. Besides it is not necessary for my job.
I studied these ones, too. According to a Russian standard GOST 9929 the lenth of tubes of this type of heat-exchanger ranges from 6-9 metre, relative pressure up to 6,4 MPa for temperature 450 C.
In devices such as this is provided free thermal elongation of tubes. Each tube can expand independently of the casing and the adjacent tubes.
Comments
These are good when the product inside the tubes doesn't creat a lot of fouling because they are not easy to clean due to the bends in the tubes. The stresses on the tubesheet are obviously different than those associated with straight tubes.
In devices such as this is provided free thermal elongation of tubes. Each tube can expand independently of the casing and the adjacent tubes.