Precautions for the use of chemical process pumps and disassembly and assembly
Release time:
2022-08-06
Source:
Chemical process pumps are widely used in industries, urban water supply and drainage, as well as irrigation and drainage in farmland and orchards, for transporting clean water or other liquids with physical and chemical properties similar to clean water. Let's take a look at the precautions for using chemical process pumps, as well as disassembly and assembly.
Chemical process pumps are widely used in industrial and urban water supply and drainage, irrigation and drainage in farmland and orchards, transporting clean water or other liquids with physical and chemical properties similar to clean water. Next, let's look at the precautions for using chemical process pumps and their disassembly and assembly.
I. Disassembly of Chemical Process Pump
1. Remove the drain pipe plugs on the pump body and the bearing frame, allowing the liquid inside the pump and the lubricating oil in the bearing frame to drain. (Note: If there are additional pipelines on the pump, they should also be removed.)
2. Disassemble the connecting bolts between the pump body and the bearing frame, and remove all rotor components such as the bearing frame part and pump cover from the pump body.
3. Remove the impeller nut, then take off the impeller and key.
4. The pump cover is connected to the shaft sleeve, sealing cover, and mechanical seal components by the shaft. If the seal uses a special structure, different disassembly methods should be noted.
5. Disassemble the pump coupling and key.
6. Remove the front and rear bearing covers of the bearings at both ends of the bearing frame, then take out the shaft along with the bearings from the bearing frame.
7. Remove the bearings from the pump shaft.
II. Assembly of Chemical Process Pump
1. After unpacking, check the pump and motor to ensure that there are no damages or looseness caused by transportation of fasteners, that the inlet and outlet end covers of the pump are intact, and that no dust or dirt has entered the pump. If everything is fine, there is no need for disassembly, cleaning, or assembly; it can be sent directly to the installation site.
2. It must be ensured that during operation, the pump does not exceed its allowable cavitation margin. The suction height (or backfill height) must be determined based on the cavitation characteristics of the screw pump, pipeline resistance loss characteristics, and high-temperature suction surface pressure before starting to use the filling pump.
3. The suction and discharge pipelines should have separate supports and cannot be used as supports for the pump.
4. The installation position of the pump should facilitate inspection and maintenance. For newly installed suction pipes and discharge pipes, debris should be cleaned before connecting to the pump to form a circulation pipeline.
5. Installation Sequence
(1) Place the unit on a foundation with embedded anchor bolts, placing a pair of wedge pads between foundations for alignment.
(2) Loosen the coupling. Use a level on the pump shaft or outer circle of the pump coupling; adjust wedges to find level on gauge, then properly tighten anchor bolts to prevent movement.
(3) Fill concrete into base and anchor bolt holes.
(4) After fixing with dry concrete, tighten anchor bolts again and recheck levelness of pump shaft.
(5) After connecting pipelines and determining rotation direction of prime mover, connect coupling; check concentricity of shaft again; measure upper and lower outer circles of coupling; left-right gap should not exceed 0.1mm; spacing between two coupling end faces should be reasonable.
(6) Conduct post-inspection after actual operation of unit for 3-4 hours; if no adverse phenomena occur, installation is considered qualified.
Chemical process pump
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