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The maximum flow rate of gas in a 1/4 inch outer diameter pipeline is not fixed and is dynamically affected by factors such as pressure, temperature, gas type, and pipeline characteristics. Under ideal conditions, the compressed air flow rate is approximately 1-3m ³/h. 1. Core influencing factor 1.1 Pipeline characteristics: The frictional resistance generated by the rough inner wall of steel pipes is about 30% higher than that of smooth plastic pipes, directly affecting the upper limit of flow. For example, under the same pressure, the flow rate of a 1-meter-long plastic pipe may be 15% -20% higher than that of a steel pipe of the same length. 1.2 Gas Physical Properties: The viscosity of hydrogen gas (8.8 μ Pa · s) is only 47% of that of air (18.5 μ Pa · s), and its density is only 7% of that of air. At a pressure of 0.6 MPa, the flow rate of hydrogen can reach more than three times that of air. 1.3 Operating parameters: For every 20 ℃ increase in temperature, the air volume expands by about 7%, corresponding to a flow rate increase of about 5%. When the pressure increases from 0.3MPa to 0.6MPa, the increase in compressed air flow rate can reach 60% -80%. two In engineering practice, typical reference data shows that when a 1/4 inch (6.35mm) copper pipe is used to transport 0.6MPa compressed air: - the flow rate of a 5-meter short pipe is about 2.5m ³/h - the flow rate of a 20 meter long pipe decreases to 1.8m ³/h due to increased pressure loss - if PVC pipe is used, the flow rate of a short pipe under the same pressure can reach 3m ³/h. 3. Calculation tool selection: For scenarios where the pressure is ≥ 0.5MPa or the pipe length is>50 meters, the Darcy Weisbach formula should be used to calculate the friction coe
2. Requirements for installation distance of porous flow orifice plate
The core requirement for installation distance of porous flow orifice plate is to ensure the length of the front and rear straight pipe sections to ensure measurement accuracy.
. The basic requirement is a front 10D and a back 5D, but the specific length needs to be determined based on the on-site pipeline conditions and aperture ratio (β value) according to ISO 5167 or GB/T 2624 standards. 1. General installation distance requirements: In general scenarios, the basic requirements for the front and rear straight pipe sections of porous flow orifice plates are: • Upstream straight pipe section (front straight pipe section): length at least 10 times the inner diameter of the pipeline (10D) • Downstream straight pipe section (rear straight pipe section): length at least 5 times the inner diameter of the pipeline (5D). 2. Extension requirements when there is a disturbance source. If there are disturbance components such as valves and elbows upstream, the length of the straight pipe section needs to be significantly increased to meet measurement requirements. |Disturbance source type | Minimum front straight pipe length | Minimum rear straight pipe length | |: --- |: --- |: --- | | | Single elbow or tee | 10D -20D | 5D | | Double elbow in the same plane | 30D -50D | 5D | | Regulating valve (fully open state) | 50D -100D | 10D | Gradual pipe (diameter ratio ≤ 0.7) | 10D -20D | 5D | 3. Influence of aperture ratio (β value) The apertur
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