Chemical pump mechanical seal and construction installation points
September 09, 2022
1, the form of seal For the static seal, usually only two forms of seals and seals, and O-ring seal again the most widely used; for dynamic seals, chemical pumps rarely use packing seal, the main mechanical seal , Mechanical seal has a single and double face, balanced and unbalanced, balanced type for high pressure medium seal (usually refers to the pressure greater than 1.0MPA), double-end machine seal is mainly used for high temperature, easy to crystallize, there are Viscosity, containing particles and toxic volatile medium, double-ended machine seal should be injected into the sealed chamber isolation fluid, the pressure is generally higher than the medium pressure 0.07 ~ 0.1MPA.
2, sealing material Chemical centrifugal pump static sealing material generally used fluorine rubber, special circumstances only use PTFE material; mechanical seal ring static material configuration is more critical, not cemented carbide on the best carbide, high price On the one hand, the difference between the two hardness is not reasonable, so it is best to distinguish between media characteristics.
Chemical pump construction and installation points:
Pump installation should be consistent with the national standard GB50275-1998 "compressor, fan, pump installation engineering construction and acceptance specification."
① The regulations apply to the installation of centrifugal chemical pump, well pump, vertical axial flow pump and guide vane mixed flow pump, motor reciprocating pump, steam reciprocating pump, metering pump , screw pump and water ring vacuum pump .
② should check the size of the pump installation foundation, location and elevation should be consistent with engineering design requirements.
The pump unpacking inspection shall meet the following requirements: The pump parts and components should be counted according to the provisions of the technical documents of the equipment, and there should be no missing parts, damage and corrosion, etc., the nozzle protector and the cover should be intact; should check the pump's main The installation dimensions should be in accordance with the engineering design; the type and size of the main parts, seals and gaskets of the pump delivering the special medium should be checked.
④ The factory has been assembled, well-adjusted part of the disassembly.
⑤ drive and pump connection, should be based on the axis of the pump to find positive drive machine and pump connection between the middle of the machine should be based on the axis of the middle machine to find the correct.
⑥In addition to the pipe installation should comply with GB50235 ~ 1997 "Industrial Metal Pipe Project Construction and Acceptance Code," the provisions should still meet the following requirements: pipe and pipe ends should be cleaned, remove debris, sealing surface and the thread should not be damaged ; Suction pipe and the output pipe should have their own support, the pump shall not directly withstand the weight of the pipe; the flange face connected to each other should be parallel to the axis of the threaded pipe joints should not be forced by flange bolts or fittings; pipe After connecting with the pump, the original accuracy of the pump should be re-checked. When the pipe connection is found to cause deviation, the pipe should be adjusted. After the pipe and the pump are connected, welding and gas cutting should not be carried out on the pipe. When welding and gas cutting are required , The pipelines should be disassembled or the necessary measures should be taken and the welding slag should be prevented from entering the pump. The configurations of suction and discharge pipes of the pump should comply with the design requirements and when there is no regulation, press. GB50275 ~ 1998 Appendix II of the regulations.
⑦ pipe lubrication, sealing, cooling and hydraulic systems and the like should be washed clean kept clear; the device should the pressure receiving portion technology predetermined file are tightness test. When there is no regulation, it shall be implemented according to the current national standard "Code for Construction and Acceptance of Industrial Metal Pipelines".
⑧ pump test run should be carried out in the normal operation of its subsidiary system after a separate test.
⑨ pump should be carried out in the media test run, test run of the media or substitute media should meet the design requirements.
