【Daily Question: Pump Equipment】Short Answer Question, 3.6.2019
Thread Content
This post was last edited by 3983596_FPPZ on 2019-3-6 08:21. For bk14.jpg: Rules for short-answer questions: 1. If the answer is incorrect, +2 Wealth will be given for active participation; if the answer is somewhat reasonable but not specific enough, +5 Wealth will be given; if the answer is correct, +8 Wealth 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 if the deadline is passed. Studying* and winning awards again; come by here every day. Briefly describe the conditions of high-pressure operation (high inlet pressure). What considerations should be taken into account when selecting a centrifugal pump? Answer: 1. Shell pressure resistance: The wall thickness of the shell should be sufficient; reinforcement ribs should be used at areas prone to deformation, such as large flat surfaces under high pressure and those with low curvature. The flange grade and type must meet the requirements of the operating pressure ； 2. Bolt strength: Verify whether the tensile strength of the bolts connecting the pressure-bearing shells meets the requirements ； 3. Static sealing points: Verify the pressure-bearing capacity of gaskets and seals – regarding their type, structure, material, and dimensions; for seals at joints, plug connections, and similar locations that are subject to pressure, reliable structures and dimensions should be employed ； 4. Mechanical seal: A suitable sealing structure is employed (such as balanced type, double-face type, etc.) ； 5. Axial force balance: High inlet pressures can cause additional axial forces, leading to rotor displacement or friction between moving and stationary parts; measures should be taken to counteract or accommodate this axial force (by appropriately increasing the bearing specifications to enhance their load-bearing capacity) ；
1. Shell pressure resistance: The wall thickness of the shell should be sufficient; reinforcement ribs should be used at areas prone to deformation, such as large flat surfaces under high pressure and low curvature. The flange grade and type must meet the requirements of the operating pressure； 2. Bolt strength: Verify whether the tensile strength of the bolts connecting the pressure-bearing shells meets the requirements ； 3. Static sealing points: Verify the pressure-bearing capacity of gaskets and seals – regarding their type, structure, material, and dimensions; for seals at joints, plug connections, and similar locations that are subject to pressure, reliable structures and dimensions should be employed ； 4. Mechanical seal: A suitable sealing structure is employed (such as balanced type, double-face type, etc.) ； 5. Axial force balance: High inlet pressures can cause additional axial forces, leading to rotor displacement or friction between moving and stationary components; measures should be taken to counteract or absorb such axial forces ；
Selection of mechanical seals, selection of the pump’s volute
1. Pressure resistance requirements of the housing； 2. Axial force balance ； 3. Choose a reasonable machine seal structure such as a balanced type ； 4. Strength of bolts and other accessories
Shell pressure resistance, bolt specification strength, gaskets, mechanical seals, balance of axial forces, selection of bearings
1. Shell pressure resistance: The wall thickness of the shell should be sufficient; reinforcement ribs should be used at areas prone to deformation, such as large flat surfaces under high pressure and low curvature. The flange grade and type must meet the requirements of the operating pressure； 2. Bolt strength: Verify whether the tensile strength of the bolts connecting the pressure-bearing shells meets the requirements ； 3. Static sealing points: Verify the pressure-bearing capacity of gaskets and seals – regarding their type, structure, material, and dimensions; for seals at joints, plug connections, and similar locations that are subject to pressure, reliable structures and dimensions should be employed ； 4. Mechanical seal: A suitable sealing structure is employed (such as balanced type, double-face type, etc.) ； 5. Axial force balance: High inlet pressures can cause additional axial forces, leading to rotor displacement or friction between moving and stationary parts; measures should be taken to counteract or accommodate this axial force (by appropriately increasing the bearing specifications to enhance their load-bearing capacity) ；
1. Shell pressure resistance: The wall thickness of the shell should be sufficient; reinforcement ribs should be used at areas prone to deformation, such as large flat surfaces under high pressure and low curvature. The flange grade and type must meet the requirements of the operating pressure； 2. Bolt strength: Verify whether the tensile strength of the bolts connecting the pressure-bearing shells meets the requirements ； 3. Static sealing points: Verify the pressure-bearing capacity of gaskets and seals – regarding their type, structure, material, and dimensions; for seals at joints, plug connections, and similar locations that are subject to pressure, reliable structures and dimensions should be employed ； 4. Mechanical seal: A suitable sealing structure is employed (such as balanced type, double-face type, etc.) ； 5. Axial force balance: High inlet pressures can cause additional axial forces, leading to rotor displacement or friction between moving and stationary parts; measures should be taken to counteract or accommodate this axial force (by appropriately increasing the bearing specifications to enhance their load-bearing capacity) ；
The last edit to this post was made by drift by_WEWJ on 2019-3-6 at 08:34. The pump casing must have sufficient pressure resistance; the axial force may act in the opposite direction. The mechanical seal must also be able to withstand pressure, the bolts need to be strong enough, and the sealing mechanism must function properly.
In conditions where the pressure at the pump inlet is high, it is not recommended to use horizontal single-stage single-suction cantilever centrifugal pumps; instead, pumps with a double-supported structure should be used.