Pipe design size
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I would like to ask the experts: 1. The design flow velocity for pipes is generally set at 10–15 m/s, and the pipe diameter is determined by dividing the air volume by this flow velocity. So, should the air volume used be the standard condition value or the actual operating condition value? 2. For example, at standard conditions, 1000 Nm³/h; at room temperature and 1000 Nm³/h at 200°C. When these values are converted to actual operating conditions, the airflow rates become different, and consequently, the diameters of the pipes also vary. I would like to ask whether, under normal circumstances, the pipe diameter should be designed based on the standard condition air volume or the actual operating condition air volume, as high-temperature gases are encountered in such projects ；
The wind speed is calculated based on actual operating conditions.
Design the pipe diameter based on the airflow under operating conditions
Calculate according to operating conditions. Temperature has little impact.
Calculate it based on the operating conditions, but the flow rate is only for reference. Under actual operating conditions, at the same pressure, an increase in temperature leads to a decrease in density. On a microscopic level, at the same flow rate, the probability of molecular collisions decreases; therefore, it is actually possible to increase the flow rate somewhat. Actually, regarding the recommended flow rate, personally I feel it would be better to summarize it in terms of mass flow rate, as this makes it easier to standardize.
When normal-temperature gases are converted to operating conditions, the change is minimal；