Can the actual amount of circulating water used be greater than the designed amount?
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I would like to ask everyone: are there any standard requirements stating that the actual amount of circulating water used should not exceed the designed amount? Or can it only operate at the designed capacity? Are there any relevant specifications that address this? Thank you!
You need to ask your team how much margin was available in the design at that time, and check whether what you proposed can be used General designs include a margin of safety
Our operating procedures state this; is there any margin here? ? ? The designed flow rate for the circulating water in the refining section is 25,973 m3/h; the design capacity is over 29,800 m3/h, and at present the actual flow rate has reached 30,000 m3/h. I’m wondering if there are any technical regulations requiring that this flow rate not exceed the design capacity.
There are no specific requirements; as long as it can meet the system’s process needs, that’s sufficient.
Thanks, huh. What if it exceeds that amount? ? ? Are there any rules stating that it cannot be exceeded, or are there any requirements if it is exceeded?
This depends on three parameters: first, the motor current; second, whether the water supply pressure meets the requirements of each device; and third, whether the water supply temperature meets the requirements of each device.
Generally, a safety margin of 10%–15% is reserved during design; it’s acceptable to exceed the designed values by a small amount. As long as the water temperature can be maintained and the user’s requirements are satisfied, it can be used without concern in the short term. However, there is no margin left at this point; if any part encounters problems, there is no room for adjustment to restore balance. Operating under overload conditions for extended periods is not recommended.
It’s better to have a margin, as some heat exchangers require spraying in summer
What was said on floor 7 is more practical in terms of application. To put it simply: 1. Check whether the motor associated with the circulation pump is powerful enough. If the pump requires 50 Kw of power but the motor has a capacity of 65 Kw, then there is plenty of headroom. However, if the motor only has a capacity of 55 Kw, an excessive flow rate will cause the motor current to rise significantly, increasing the risk of damage to the motor. 2. Regarding the flow rate you need, the size of the pipes will not change; increasing the flow rate will inevitably lead to an increase in the pressure at the pump outlet, so the pipes and their connections must be able to handle this. 3. With an increased amount of water circulating, will the cooling capacity of the cooling tower be sufficient?
Thank you! However, the pumps are currently all running at full capacity. If we increase the flow rate, won’t the outlet pressure decrease? How can it get bigger?