【Daily Question: Pump Equipment】Short Answer Question 2019.3.12
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This post was last edited by 3983596_FPPZ on 2019-3-12 09:29. Regarding bk14.jpg, the rules for answering questions are as follows: 1. If the answer is incorrect, +2 wealth points will be given for active participation; if the answer is somewhat reasonable but not specific enough, +5 wealth points will be awarded; if the answer is correct, +8 wealth points will be given. 2. Rewards for answers are available once per person only. 3. Each reply allows scoring for only one person. 4. The answer and its explanation will be visible after responding. 5. The reward is valid for 48 hours; no reward will be given after that period. Studying* and winning awards again; come by here every day. Briefly explain why, in long-distance pipeline transportation, the larger the pipe diameter, the higher the economic flow velocity (Please explain based on the principles, without considering cost control.) Answer: Due to the viscosity of the liquid, the resistance that prevents its flow mainly comes from friction against the pipe walls. The greater the distance from the wall, the greater the resistance; the magnitude of this resistance decreases gradually as one moves away from the wall. In pipes with a larger diameter, there is more liquid at a greater distance from the walls, so the resistance to its flow is smaller. Therefore, the economic flow velocity is higher for larger pipe diameters.
When the flow rate of the fluid being transported remains constant, the larger the pipe diameter, the lower the flow velocity, which is beneficial for energy savings
The greater the flow velocity of the medium inside the pipe, the greater the resistance. As the flow velocity decreases, although the flow resistance is reduced, a larger pipe diameter is required for the same flow rate, resulting in increased equipment costs.
Due to viscosity, there is a driving force; the larger the pipe wall, the greater the resistance
Briefly explain why, in long-distance pipeline transportation, a larger pipe diameter results in a higher economic flow velocity 1. It should still be due to low system resistance! 2. Construction costs! 3. Maintenance costs!
Because the larger the pipe diameter, the lower the flow velocity of the medium, and thus the less pipe loss.
Due to the viscosity of the liquid, the resistance that prevents its flow arises primarily from frictional forces against the pipe walls; the greater the distance from the wall, the higher the resistance. The magnitude of this resistance decreases gradually as the distance from the pipe wall increases. In pipes with a larger diameter, more liquid is at a greater distance from the walls, resulting in less resistance to its flow. Therefore, the economic flow velocity is higher for larger pipe diameters.
Large diameter, large cross-sectional area, low resistance, and minimal losses.
Due to the viscosity of the liquid, the resistance that prevents its flow arises primarily from frictional forces against the pipe walls; the greater the distance from the wall, the higher the resistance. The magnitude of this resistance decreases gradually as the distance from the pipe wall increases. In pipes with a larger diameter, more liquid is at a greater distance from the walls, resulting in less resistance to its flow. Therefore, the economic flow velocity is higher for larger pipe diameters.
Due to the viscosity of the liquid, the resistance that prevents its flow arises primarily from frictional forces against the pipe walls; the greater the distance from the wall, the higher the resistance. The magnitude of this resistance decreases gradually as the distance from the pipe wall increases. In pipes with a larger diameter, more liquid is at a greater distance from the walls, resulting in less resistance to its flow. Therefore, the economic flow velocity is higher for larger pipe diameters.