Mechanical seal and construction and installation of chemical centrifugal pump

1, seal form for static sealing, usually only a sealing pad and a sealing ring two forms, and the sealing ring and O ring with the most widely used; for the dynamic seal chemical pump is seldom used in packing seal, mechanical seal, mechanical seal and single face and double face, balanced and unbalanced type the seal for high pressure balance type, medium (usually more than 1.0MPA pressure), double end sealing machine is mainly used for high temperature, easy crystallization, viscosity, particle and medium containing toxic volatile, double end mechanical seal should be injected into the isolation liquid to the sealing cavity, the pressure is generally higher than the medium pressure 0.07 ~ 0.1MPA.

2, the sealing material chemical pump static sealing materials commonly used in fluorine rubber, under special circumstances the use of PTFE material; mechanical seal ring is more critical of the material configuration is not the best of carbide carbide, high prices on the one hand, the hardness difference between the two is not reasonable, so the best features of discrimination under the medium.

Key points of construction and installation of chemical centrifugal pump:

Pump installation should be in line with the national standard GB50275-1998 "compressor, fan, pump installation engineering construction and acceptance specifications".

The provisions apply to the installation of centrifugal chemical pumps, pumps, vertical axial flow pumps and guide vane mixed flow pumps, motor reciprocating pumps, steam reciprocating pumps, metering pumps, screw pumps and water ring vacuum pumps.

The size, position and elevation of the installation foundation of the pump should be checked and the design requirements of the project should be checked.

The pump inspection shall meet the following requirements: according to the provisions of equipment technical documents checking pump parts and components, and there should be no missing parts, damage and corrosion, pipe protection and cover should be intact; mounting dimension shall check the pump and should be consistent with the engineering design should be the main parts, check the delivery; special medium pump seals and gaskets of varieties and specifications.

The factory has been part of the assembly, adjustment and improvement shall be removed.

By connecting the driver with the pump, to pump axis as the reference alignment, a middle machine is connected between the engine and the pump drive, using the middle axis as the reference alignment machine.

The piping installation shall comply with the provisions in GB50235 ~ 1997 "industrial metal pipeline engineering construction and acceptance specification" outside, still should meet the following requirements: the inside of the pipe and the pipe end should be clean, remove debris, sealing surface and the thread should not damage; suction pipe and the output pipe should have their support, may not pump bear the weight of the pipe; the end surface of the flange connection should be parallel, threaded pipe joint axis response, should not use flange bolts or pipe joint force connection; pipeline and pump connection, the original alignment of pump should recheck accuracy, when the pipeline connection caused by deviation, should be adjusted by the pipeline and pump tube; after the connection, should not be used in the welding and cutting, welding and cutting when needed, should remove the pipeline or take the necessary measures, and should prevent the welding slag into the pump; pump suction and discharge piping shall be in accordance with the configuration Design requirements, when no regulations, according to. The provisions of annex two of GB50275 ~ 1998 are carried out.

The pipeline lubrication, sealing, cooling and hydraulic system should be cleaned unblocked; the compression part shall be tightness test according to the provisions of the equipment technical documents. When no regulations should be in accordance with the existing national standard "industrial metal pipeline engineering construction and acceptance norms" of the provisions of the implementation.

The pump running test shall be carried out in normal operation separately in each of its affiliated system.

We should be in a case of medium pump commissioning, commissioning of the medium or medium substitute shall comply with the design requirements.