How to calculate the pressure drop in 35MPA high-pressure nitrogen pipelines
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Dear seniors: How is the pressure drop in pipelines for 35MPA high-pressure nitrogen calculated? For example: the pipe material is stainless steel, the inner diameter of the pipe is 28 mm, the length of the pipe is 1253 meters, the medium is air, the pressure is 35 MPa, the temperature is 20°C, and the volumetric flow rate is 1500 Nm3/h. I asked DeepSeek, and it recommended using the Panhandle B formula for calculation; I’m not sure if this gives an accurate result Thank you!
The pressure drop in high-pressure nitrogen pipelines can be calculated using the Panhandle B formula, which is a common and suitable method for calculating such pipelines. The specific steps are as follows: 1. Determine the relevant parameters: - Pipe inner diameter (D): 28 mm - Pipe length (L): 1253 m - Pressure (P): 35 MPa - Temperature (T): 20°C - Volumetric flow rate (Q): 1500 Nm³/h 2. Convert the units to those suitable for calculation: - Inner diameter: 28 mm = 0.028 m - Volumetric flow rate: 1500 Nm³/h = 1500 / 3600 = 0.4167 Nm³/s 3. Apply the Panhandle B formula: \ Where: - ΔP is the pressure drop, in Pa - Q is the volumetric flow rate, in Nm³/s - T is the absolute temperature, in K (Converting Fahrenheit to Kelvin: T(K) = 20°C + 273.15 = 293.15 K) - P is the absolute inlet pressure, in kPa (Converting MPa to kPa: 35 MPa = 35000 kPa) - D is the pipe diameter, in m - L is the pipe length, in m 4. Substitute the corresponding values into the formula to perform the calculation: \ The value of ΔP obtained after calculation is the desired pressure drop. Note that it is necessary to recheck whether the units of the results meet the requirements; it may be required to convert the results from Pa to MPa or other units. The results obtained using this calculation method are usually close to the actual conditions, but it is best to verify and adjust them using data from on-site tests. .