Regarding the tube strike issue in condensers
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The factory upgraded a hot water heater to generate hot water. After being heated, the 1.0MPa steam enters a condensate tank. Due to the high pressure in this tank, the condensate entering the condensate piping system can cause pipe shock. As a solution, a DN25 pipe was added to the top of the condensate tank to channel the vapor that forms there into the steam piping system operating at 0.3MPa (with a normal pressure of around 0.25MPa). Although pipe shock was alleviated, it still occurs. The pressure in the condensate tank is around 0.5MPa. I would like to ask experts: what pressure level in the condensate tank is necessary to prevent pipe shock? Also, what diameter should the pipe at the top be to relieve this pressure? Or calculation formulas or something like that
This phenomenon should be called a \"steam hammer\", right? It occurs when water vapor suddenly condenses into water within the liquid, causing its volume to shrink abruptly and resulting in a sharp drop in pressure. Immediate replenishment of vapor restores pressure balance, and this cycle of condensation repeats, giving rise to the steam hammer phenomenon. This phenomenon is very annoying, as the vibrations it generates can often damage the equipment. There’s no good solution.
Are you saying that the issue occurs in the hot water circuit rather than in the steam circuit? ?
Water hammer phenomena occur quite frequently in steam heaters equipped with condensate tanks. 1. Maintain a stable liquid level in the condensate tank; 2. Ensure that the liquid level is below the inlet pipe of the tank; 3. Guarantee that the non-condensable gas discharge line at the top of the tank is unobstructed; 4. The installation location of the heater must be above the condensate tank.
My supervisor thinks that the DN25 diameter of the pipeline is too small; given that the pressure in the condensate tank is 0.5 MPa, while a pressure of 0.3 MPa would correspond to 0.25 MPa. Could using a larger diameter pipeline help to reduce this pressure? If the pressure in the condensate tank is lower, steam won’t be able to enter the condensate piping network, and thus pipe slugging won’t occur
What is a pneumatic hammer? ? ? What is a water hammer? ? Actually, I just want to ask what the pressure in the condensate tank is; at what level does pipe slugging occur?
That DN25 pipeline is mainly used to vent non-condensable gases, so it should not affect water hammer.
1 MPA = 177 degrees C; 0.3 MPA = 132 degrees C. The operating pressure for this tank is 0.3 MPA, so when 1 MPA is applied, the temperature of the entire tank rises. When a 25 DN pipeline is in use, the effect is less severe. What if the diameter of the control valve’s pipeline also increases? Would that allow the vaporized volume to be discharged more quickly, resulting in a more noticeable effect? ---------------------------------------------------------------------------------------------------------- What someone mentioned above is correct: when there is a large pressure difference, water hammer is hard to avoid. If possible, it would be better not to use 1 MPA for heating with hot water, but rather to use steam at a lower pressure in order to prevent water hammer from occurring. I’ve also asked similar questions before regarding water hammer, but I think the occurrence of water hammer is related to the tank itself rather than the pipelines... I’ve seen similar situations occur inside the tank
I don’t have any other steam pipelines here; what is the pressure difference between the condensate tank pressure and the pressure in the condensate piping network that prevents pipe slugging from occurring? ? ? ? ? ? ? ?