Pipeline pump related knowledge

Pump assembly and disassembly: pump assembly should be checked before the parts, parts with the surface, especially the mechanical seal friction surface should be cleaned, the sealing surface should not have obvious scratches and cracks, bruises and other defects, if any The above defects should be replaced. Assembly: The retaining ring pressed into the motor shaft, the seat bolted to the motor. Apply the lubricant such as Vaseline to the rubber ring of the mechanical seal static ring, press the static ring assembly into the middle of the shaft, apply clean grease on the sealing surface, install other sealing parts, install flat key, impeller and Stop washers and tighten with bolts. CAUTION: Seal rings on the stationary seal of the mechanical seal tend to deflect during installation. This will result in leakage of the seal and should be carefully inspected during installation. Apply moderate amount of grease to the sealing end of the center seat and install the O-ring. Install the O-ring, the ring easily fall off and fold, be careful not to cause water leakage Lifting the motor components, the impeller down, slowly set into the pump body, and then bolted, install the tube plug and bleed plug . Rotate the rotor by hand to check for any stuck phenomenon. Disassembly: Follow the installation reverse procedure. Note: When disassembling the mechanical seal, you can not directly hit the static ring with a hand hammer or a hammer, gently tap the wood and slowly remove the static ring. If the accumulation of dirt caused by demolition difficulties, should be cleaned and then disassembled. Installation, Operation and Maintenance of Unit: Installation: When installing, it should be the place nearest to the liquid to be installed, and the pump should be installed at the suction pipe with the minimum suction height and the shortest distance. Attention: The distance between the unit and surrounding obstacles should be ensured More than 150㎜, make the motor fan have enough air source. When the pump is used where the vibration is more stringent, you can use the shock absorber (pad), according to the manufacturer's instructions for installation. Pipeline installation should be reliable fixed, close to the pump flange pipe support should be sufficiently rigid, not to allow the pump to withstand the weight of the pipeline pressure. Install the pump unit to avoid direct sunlight and rain. Pump inlet pressure gauge should be installed, outlet flange pressure gauge should be installed to observe and control the operation of the pump. Pressure gauge range should be 2 to 3 times the actual pressure is appropriate. Pump inlet and outlet piping should be installed gate valve to facilitate maintenance and operation of the regulation. Wiring: must be the correct nameplate requirements wiring, wiring, the terminal must be solid, not allowed to loose, otherwise, will result in poor contact caused by lack of phase burning machine. To ensure the reliable operation of the motor, the electrical switch should be fitted with overload protection device and adjust the size of the protection device according to the current requirements on the motor nameplate. Warning: If no overload protection device is installed, the motor will be burnt out due to overload when the outlet valve is fully open, large flow rate operation or sudden increase of current in some cases. In the suction condition (the water level is lower than the impeller axis or the water level is lower than the axis of the pump suction), the standard installation of the pump height H = 10- (NPSH) r-0.5-hw, hw for the suction pipe resistance loss The unit of measure in the formula: m). When pumping water from the pool, the length of the straight pipe in front of the suction inlet of the pump should not be less than 3 times the diameter of the inlet. The depth of the suction nozzle immersed in the water should be more than 1.5 times the inlet diameter and not less than 500㎜. The distance from the suction nozzle to the wall should be more than 1.5 times the caliber and 1.5 times the caliber and not less than 500㎜ from the bottom. The total area of ​​the filter should not be less than 2 ~ 3 times the area of ​​the suction nozzle . Note: The horizontal section of the suction pipe installation counter-current flow direction slightly downward tilt to prevent nest gas. In order to facilitate the pump before the start of irrigation, the check valve can be added at both ends of a bypass valve, open the bypass valve before the pump starts pumping water to the pump, closed after filling, easy to use. For high-rise building water supply or export pressure is greater than 0.2MPa pump, in addition to the discharge gate valve installed, but also between the pump outlet and the gate valve with a check valve to prevent sudden power failure caused by high pressure water backflow impeller damage. Operation: Open the inlet valve and bleed plug, close the outlet gate valve, close the bleed plug after the pump is filled with water. Before starting, use a Screwdriver to dial the pump motor fan to check the motor running flexibly. Jog the motor to determine if the direction of rotation of the pump shaft matches the direction of rotation on the pump (clockwise from the motor end). WARNING: It is forbidden to try out the pump without water to avoid mechanical seal damage. When the inlet valve is fully open and the discharge valve is closed, start the pump, open the pressure gauge, and gradually open the outlet valve until the desired operating condition (the operating time should not exceed 3 minutes when the outlet valve is closed), pay attention to the current Not exceed the rated current. Note: The operating conditions point flow is not greater than the performance of the table given in the large flow is appropriate, running, the actual head H = (P -P into) /0.0098 should not be less than the performance of the table given in the large flow point Corresponding to the appropriate head (P in the formula for the value of the outlet pressure gauge, P into the pump flange flange pressure gauge value, pressure unit: MPa, head unit: m). The ideal and efficient operating condition is the mid-point given in the performance chart, which can be adjusted by observing the inlet and outlet (vacuum) gauges. In the device (pipeline) curve has been set, if you want to adjust the pump operating conditions, the better way is by changing the speed or adjust the diameter of the impeller to achieve, the implementation please consult the manufacturer. Shutdown sequence: close the discharge valve on the gate ---- motor --- pressure gauge. Maintenance: Should check the smooth operation of the process, the mechanical seal wear and leakage, timely replacement of seals to prevent pressure water into the motor. Often check the motor housing temperature changes, the pump is running, the motor temperature allows up to 80 ℃, if necessary, to further check the motor current overload and three-phase current imbalance phenomenon. Regularly check the floats and floats in the sink. If the flooding pool drops below the minimum water level, the pump should stop running to prevent cavitation and damage to the impeller. When necessary, adjustable gate valve, appropriate to reduce the pump out of water to promote pool water level rise. Pay attention to changes in pressure gauge and ammeter, found abnormal, take appropriate measures in time. Long-term deactivation of the pump should drain net water, remove rust, coated with anti-rust grease.

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