FJXP big flux low-lift axial flow pump evaporator forced circulation pump Quality Choice

Note: Data listed in the above table are only applicable to clean water at normal temperature. Please convert the data as per actual situation upon selection. In case the selected parameters are beyond the above table, our company is able to meet your demands by changing impeller size or by other relative methods.

3.Structure Description     Forced circulating pump is a kind of horizontal anti-corrosion axial flow pump. Its flow passage components use steel lined with PTFE and hastelloy, and its shaft seal adopts combinations of auxiliary impeller dynamic seal and mechanical seal in order to avoid liquid leakage at operation and shut-down. Mechanical seal applied for the shaft seal has two structures: single end face and double end face, depending on users’ options. Majority of parts and components are shared by single end face and double end face mechanical seal, both of which require flushing liquor and cooling water. Double end face structure is recommended in occasions of strong corrosion, as well as high pressure and concentration, e.g. at caustic soda evaporation section. For the convenience of users’ installation and inspection, mechanical seal housing adopts split type. Bearing box is provided with cooling device to cool the lubricating oil. At the lower part of bearing, an oil leveler is installed to check the oil level at any time. Jaw coupling is driven by rubber blocks, which is capable of absorbing shake and buffering. Compared with similar products in China, this pump is featured with compact structure, smooth operation, lighter weight and less floor space.

4.Installation 1. Pump and motor must be installed at the same axis, with deviation less than 0.2millimeter. 2. Connecting pipe of the pump should be equipped with supports reasonably. 3. Pipe may get expanded due to temperature difference during pump start-up and shut-down, so expansion bend should be installed at inlet and outlet pipe.

5.Operation and maintenance    

 1. Regularly check oil leveler. In case the oil level drops to the lowest level, lubricating oil must be added.    

2. After installation, in case mechanical seal requires check and adjustment, provided that pump body and bearing seat are not moved, it is allowed to disassemble the horizontally split case to carry out check and adjustment.    

 3. When replacing impeller or checking the internal part of pump body, loosen the retaining screws on motor, stop the motor, then remove small bolts from rear cover, and take out the rotating part.   

  4. Flush the entire system to clean impurities before the pump starts up for the first time. Check the sealed parts and bearing box for free flow of cooling water and flushing liquor. Before the pump starts to operate, check whether flushing liquor pressure is 0.5-1kg/centimeter2 higher than the system pressure.    

 5. Inch the pump by motor. Check the impeller for right rotation direction. Rotate in the reverse direction is forbidden.    

6. In case abnormal vibration or noise occurs, shut-down the pump for inspection without delay.     7. Regularly check pump and motor for bearing’s temperature rise, with max. temperature less than 75°C.    

8. Regularly replace the lubricating oil for bearing. Generally, the oil should be replaced once every after the bearing operates 4000h in total.    

 9. Conduct periodic pre-maintenance to pump’s main quick-wearing parts like impeller, mechanical seal, bearing and oil seal. In case severe abrasion and corrosion arise, replace the parts without delay.    

 10. If the system requires short-term shut-down, keep the pump operating to prevent crystals from depositing. If the system is to be shut down for a long time, completely clean the pump to wash away residual corrosive liquid.