German ATS Special Oil Seals seals ATS Special Oil Seals model ATS Special Oil Seals price

ATS Special Oil Seals 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 stuffing box, 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 the aforementioned advantages. Cassette seals are also a type of cartridge mechanical seal. In this seal 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.

ATS Special Oil Seals seal classification

1) Packing seals: Packing seals have a simple structure, are inexpensive, and are easy to maintain. However, they exhibit high leakage rates and significant power loss. Therefore, packing seals are used for transporting general media, such as water; they are generally unsuitable for petroleum and chemical media, especially valuable, flammable, explosive, or toxic media. 2) Mechanical seals: Mechanical seals (also known as face seals) provide excellent sealing performance with minimal leakage and long service life, but they are expensive and require higher standards for machining, installation, maintenance, and repair compared to general seals. Mechanical seals are suitable for transporting petroleum and chemical media and can be used with media of various viscosities, strong corrosivity, and containing particles. The American Petroleum Institute standard API610 (8th edition) stipulates that cartridge mechanical seals shall be installed unless otherwise specified by the user. 3) Dynamic seals: Dynamic seals are divided into back-vane seals and auxiliary impeller seals. During pump operation, the centrifugal force of the back vanes (or auxiliary impeller) reduces the medium pressure at the shaft seal to atmospheric or negative pressure, preventing leakage during use. When the pump stops, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this point, the shutdown sealing device provides the seal. Packing seals are commonly used in shutdown sealing devices paired with back-vane (or auxiliary impeller) designs. Packing seals come in two types: standard and mechanically adjustable. Standard packing seals are similar to those in general packing seal pumps, requiring slight positive pressure at the shaft seal to prevent dry friction of the packing. Mechanically adjustable packing seals use counterweights to loosen the packing during pump operation and tighten it when stopped. Dynamic seals offer reliable performance, low cost, and easy maintenance, making them suitable for media containing many solid particles, such as slurry pumps and ore pulp pumps in the phosphate industry. The disadvantages are greater power loss compared to mechanical seals and shorter service life for the shutdown sealing device. The seal between the rotating pump shaft and the stationary pump casing is called the shaft seal. Its function is to prevent high-pressure liquid from leaking out along the shaft or outside air from entering along the shaft. For centrifugal pumps, the shaft seal is a dynamic seal. Depending on whether the sealing surfaces contact each other, dynamic seals are classified as contact or non-contact. Contact dynamic seals involve contact between the sealing device and the shaft, resulting in relative friction. Contact dynamic seals include packing seals and mechanical seals.

ATS Special Oil Seals seal operation

1) If slight leakage occurs after the pump starts, observe it for a period. If the leakage does not decrease after 4 hours of continuous operation, stop the pump for inspection. 2) The pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². 3) During operation, avoid cavitation to prevent dry friction and damage to the seal faces. 3) Regularly inspect the sealing condition. During operation, if leakage exceeds the standard (no more than 5 drops/min for heavy oil, no more than 10 drops/min for light oil), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

ATS Special Oil Seals seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can cause steam blow-by, leading to water ingress into the oil and deterioration of turbine oil quality. Excessively high shaft seal pressure may trigger the equalizing tank safety valve, 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: Excessively high shaft seal temperature, especially before unit startup, causes intense heating at the shaft end gland and rotor gland sections, leading to local stress concentration and deformation. This may alter the clearance between the rotor and cylinder, increase shaft seal steam leakage, increase differential expansion, and potentially cause rubbing between rotating and stationary parts. Low shaft seal temperature cools the shaft end gland and rotor gland sections, also causing local stress concentration, altering the clearance between the cylinder and rotor, increasing shaft end steam leakage, and decreasing differential expansion. Low shaft seal temperature may also cause water carryover in the shaft seal supply steam, leading to water hammer in the supply pipes. In severe cases, this can cause water ingress into the turbine.

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