- Two standard types of tube layouts are the square and the equilateral triangle.
- Triangular pitch (30o layout) is better for heat transfer and surface area per unit length (greatest tube density.)
- Square pitch (45 & 90 layouts) is needed for mechanical cleaning.
- Note that the 30°,45° and 60° are staggered, and 90° is in line.
Tube pitch
- Close pitch (small values of Pt/do) for increased shell-side heat transfer and surface compactness, and an
- Open pitch (large values of Pt/ do) for decreased shell-side plugging and ease in shell-side cleaning.
- When the tubes are to close to each other (Pt/do less than 1.25) , the header plate (tube sheet) becomes to weak for proper rolling of the tubes and cause leaky joints.
- However, these are general rules of thumb and can be “violated” for custom heat exchanger designs.
The first system cleaning in place or chemical washing is decidedly simpler but does not always allow you to obtain the desired effect it may not address deeply embedded or inaccessible residues and contaminants, leading to incomplete cleaning outcomes. In such cases, during Plate Type Heat Exchanger Maintenance work, disassembly and complete regeneration is a must.
ReplyDeleteA Plate Type Heat Exchanger plates are simple to maintain because they can be taken out and cleaned separately. But, since they may gather debris or smell, you should avoid them.
ReplyDeleteA Plate Type Heat Exchanger plates are simple to maintain because they can be taken out and cleaned separately. But, since they may gather debris or smell, you should avoid them.
ReplyDelete