Why avoid negative pressure in heat exchangers?
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I remember that on HG20570, it was mentioned something about avoiding negative pressure at the inlet and outlet of the heat exchangers in the circulating water system? Why? Thank you!
Could you tell me where the standard is? Thank you
It’s not specified in the standards, but negative pressure may cause the tubes to deform; repeated occurrences will leave marks, leading to tube rupture
Negative pressure can easily cause the equipment to become unstable and deform or get damaged.
Some heat exchangers are equipped with breather valves at their outlets to prevent negative pressure. It’s similar to a paper cup filled with milk: you can’t blow it apart by blowing into it, but it can be easily flattened if you try to suck on it – the reason for this is different in terms of design purposes
Circulating water equipment usually lacks sufficient airtightness, making it easy to draw in air under negative pressure, which can lead to internal corrosion and damage over time