Regarding flow rate, the issue of pipe diameter
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According to the economic flow rate range recommended in the process design manual, for example, 2~2.5 meters per second； I wonder if everyone takes the following factors into consideration when determining the pipe diameter? When designing for 100% load, the lower value within the aforementioned economic flow velocity range is used, such as 2.1 m/s. This allows for a larger pipe diameter, so that the flow rate is 2.1 m/s at 100% production capacity and 2.5 m/s at 120% capacity; in this way, the operation remains within the economic flow velocity range regardless of whether the load is high or low I wonder if such consideration is appropriate? ?
Simply use a load flow of 120% to determine the maximum flow velocity, such as 2.5 M/S; select the pipe diameter, and then calculate the pressure drop. This might be better. Last edited by Albertlu on 2009-4-5 10:18.]
It is sufficient to calculate the economic linear speed at 100% load, as the actual linear speed will be lower after selecting the pipe diameter grade based on that calculation; it generally suffices even at 120% load.
Normal design is considered at 100%, with 120% not taken into account.
The flow rate corresponding to 120% load of the unit should ideally be at the upper limit of the economic flow rate range recommended in the process design manual, that is, 2.5 meters per second；
LZ, your question can be addressed by controlling the pressure drop over 100 meters in order to determine the flow rate
Refer to HG20570.7; that will suffice. This post was last edited by yzq2213 on 2009-4-4 at 19:43.]
The design must certainly be based on 100% normal load; considering a 120% load would result in excessive additional costs for the owner.
The specific load level depends on the load of the accompanying conveying equipment; it should be matched to that.
This is theoretically feasible, but in practical design there is often only one option.
In fact, the selection of flow rate, pipe diameter, and pressure drop is the result of a comprehensive balance: a high flow rate and small pipe diameter can reduce initial investment costs, but a large pressure drop leads to higher operating costs. The so-called recommended flow rate is actually a balance that takes into account both the initial investment costs and the operating costs. :lol
We calculate based on 2.25 m/s and 100% load, and then round it to the standard pipe diameter. The Doctrine of the Mean!
The design is to be based on 100% normal load
You can simply calculate the economic linear speed based on 100% load
During design, the pipe diameter is generally calculated based on the specified requirements. Then, this diameter is rounded to a standard value; it is important to take into account whether the requirement concerns flow velocity or flow rate when selecting the pipe diameter.
To calculate the flow velocity inside the pipe, it is necessary to consider the viscosity of the material.
It is mainly about considering the comparison of comprehensive economic performance. Designing this thing is also the result of trade-offs. There is no best, only relatively better. Hehe
Design it at 100% directly, and then multiply by the appropriate coefficient based on your actual manufacturing requirements. However, if it’s 120%, the requirements for the equipment and pipelines will inevitably be higher
Designed at 100%, with economic factors taken into comprehensive consideration.
Pipes and their lifespan are the main reasons.
The economic flow rate range recommended in the process design manual serves as a reference; the actual flow rate should be determined based on the specific conditions at the site. If a low pressure drop in the pipes is required, a lower flow rate should be chosen, while if no such requirement exists, a higher flow rate can be utilized.