Germany Kleinmichel seals Kleinmichel model Kleinmichel price

Kleinmichel seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a single unit before installation. After passing inspection and pressure testing, the unit is mounted on the shaft within the seal chamber, fixed to the shaft with set screws, and the gland bolts are tightened. Once the cartridge positioning tabs are removed, the mechanical seal operates with parallel faces and is ready for service. This approach not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all designed as cartridge seals, offering these advantages. Cartridge seals are also a type of cartridge mechanical seal. In this design, the stationary ring, rotating ring, sleeve, gland, and auxiliary seals are all assembled together on a single sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. These pre-assembled, inspected, and tested seal components make it easier to ensure installation and assembly quality.

Kleinmichel seal principle

A mechanical seal is a shaft sealing device that prevents leakage by maintaining contact between one or more pairs of end faces perpendicular to the shaft, which slide relative to each other under the influence of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, supplemented by auxiliary seals. A typical mechanical seal structure consists of a stationary ring (static ring), a rotating ring (dynamic ring), an elastic element spring seat, set screws, a rotating ring auxiliary O-ring, and a stationary ring auxiliary O-ring. An anti-rotation pin is fixed to the gland to prevent the stationary ring from rotating. Depending on whether they have axial compensation capability, the rotating and stationary rings are often referred to as compensation rings or non-compensation rings.

Kleinmichel seal system composition

1) Seal chamber: In the past, seal chambers housing mechanical seals were designed as stuffing boxes for soft packing seals. They are unsuitable for housing mechanical seals, not only because they are too small and have narrow clearances, but also because their simple cylindrical shape is inappropriate. International standards for enlarged mechanical seal chambers have been established. Furthermore, companies such as Durametallic in the US and the Fluid Engineering Study Group in the UK are researching rational mechanical seal chamber designs. Their shapes should not only facilitate fluid flow and heat dissipation but also help remove solid particles, creating a favorable environment for the seal. 2) Fugitive emission control system: Previously, attention was focused only on eliminating visible fluid leaks, while ignoring the control of invisible fugitive emissions. This has led to environmental pollution and poses risks to equipment and personnel. International organizations, such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the US, have developed guidelines for controlling fugitive emissions from rotating machinery, compressors, and screw systems equipped with mechanical seals, including SP-30 (1994), SP-32 (1990), and SP-33 (1991). SP-30 is implemented in three stages. It clearly defines barrier fluids and buffer fluids, clarifying erroneous and confusing concepts. A barrier fluid is introduced between dual seals to completely block process fluid from leaking into the surrounding environment. The pressure of the barrier fluid is always higher than that of the sealed process fluid. A buffer fluid serves as a lubricant or cushioning agent between dual seals, and its pressure is always lower than that of the sealed process fluid. 3) Auxiliary system integration: Mechanical seal auxiliary systems require integration of cooling, heating, and flushing systems. Pump circulation needs optimization, and condition monitoring systems are being studied and resolved. Integration of auxiliary systems is specified in the API-682 standard. 4) Gas barrier seal system: In the past, barrier seal systems commonly used liquid to block liquid or liquid to block gas. To simplify bulky barrier liquid systems, barrier gases are now used to block liquids or gases. In barrier seal systems, spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other methods can be employed to block gases and liquids.

Kleinmichel seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can cause steam leakage from the shaft seal, leading to water ingress into the oil and deterioration of turbine oil quality. Excessively high shaft seal pressure may trigger the safety valve of the equalizing pressure box, wasting working fluid and damaging equipment. Low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal or even the cylinder, causing cooling of the shaft seal section or inside the cylinder, which seriously threatens equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, excessive heat causes intense heating at the shaft end steam seal and rotor steam seal sections, leading to localized stress concentration and certain deformation. This may alter the clearance between the rotor and cylinder, increase steam leakage from the shaft seal, increase differential expansion, and potentially cause serious rubbing between rotating and stationary parts. When the shaft seal temperature is too low, the shaft end steam seal and rotor steam seal sections are cooled, similarly causing localized stress concentration, altering the clearance between the cylinder and rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. Low shaft seal temperature may also result in water carryover in the shaft seal supply steam, causing water hammer in the supply pipeline. In severe cases, this can lead to water ingress into the turbine.

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