The issue of hydrophobicity level
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I would like to ask everyone, how is the heat dissipation of steam pipes calculated? Could you explain the relationship between enthalpy, latent heat, and sensible heat in the calculation of steam flow rate? It’s really confusing! Secondly, what type of steam trap should be used for drainage on the main steam pipe? Which valve should be chosen for vertical installation? I noticed on other drawings that the return pipe is higher than the steam trap, yet no check valve is used – is that acceptable? How is the allowable lift height behind a steam trap calculated? Finally, it’s not clear why high- and low-pressure steam traps can be connected to the same collection system after drainage, whereas those with bypasses cannot be connected to a unified collection system in the same way (From HG 20570) And under what circumstances should a bypass be provided for hydrophobicity? Must the bypass be higher than the level of the steam trap? There are so many things I don’t understand in this part; it’s really discouraging for a beginner like me!
The original poster has many questions; let me answer a few of them: Is it acceptable to find that the return pipe is higher than the steam trap in other drawings, yet no check valve is used? Answer: A check valve should be installed, unless the selected steam trap has a check function. How is the allowable lift height behind a steam trap calculated? Answer: It is calculated based on the allowable back pressure of the steam trap. Finally, it’s not clear why high- and low-pressure steam traps can be connected to the same collection system after drainage, whereas those with bypasses cannot be connected to a unified collection system in the same way (From HG 20570) And under what circumstances should a bypass be provided for hydrophobicity? Answer: If a bypass line is in place, should there be a leak in the shut-off valve on that bypass line, high-pressure steam will enter the steam condensate system, affecting the pressure throughout the entire condensate system. This in turn affects the back pressure of all steam traps, and it is possible for some of these traps to fail to discharge water, thereby impacting production.
Must the bypass be higher than the level of the steam trap? Answer: The bypass should not be higher than the height of the steam trap; it should either be parallel to it or lower than it.