German AirCom seals, AirCom models, AirCom prices

AirCom seals refer to devices that prevent fluid leakage by maintaining contact and relative sliding between at least one pair of end faces perpendicular to the axis of rotation, under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components: a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seats and keys or set screws.

AirCom seal operating principle

A mechanical seal is a shaft sealing device that achieves leak prevention by keeping one or several pairs of end faces, which slide relative to each other perpendicular to the axis, in contact under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, supplemented by auxiliary seals. A typical mechanical seal structure consists of a stationary ring (static ring), a rotating ring (dynamic ring), elastic elements such as spring seats, set screws, auxiliary O-rings for the rotating ring, and auxiliary O-rings for the stationary ring. Anti-rotation pins are fixed to the gland plate to prevent the stationary ring from rotating. The rotating ring and stationary ring can also be referred to as compensation rings or non-compensation rings, depending on whether they have axial compensation capability.

AirCom seal system composition

1) Seal chamber: In the past, seal chambers housing mechanical seals were stuffing boxes designed for soft packing seals. They are unsuitable for mechanical seals, not only because they are too small and have too narrow clearances, but also because their simple cylindrical shape is inappropriate. Standards for enlarged mechanical seal chambers have been established abroad. In addition, Durametallic Corporation in the United States and the Fluid Engineering Study Group in the United Kingdom are studying rational mechanical seal chambers. Their shapes should not only facilitate fluid flow and heat dissipation but also help remove solid particles, creating a favorable environment for the seals. 2) Volatile organic compound (VOC) emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while invisible VOC emissions were neglected, leading to environmental pollution and posing risks to equipment and personnel. Overseas organizations, such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States, have developed guidelines for controlling volatile emissions in 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. The API-682 standard specifies requirements for auxiliary system integration. 4) Gas barrier seal system: In the past, liquid barriers were commonly used to block liquids or gases in barrier seal systems. To simplify bulky liquid barrier systems, gas barriers are now used to block liquids or gases. Spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other methods can be employed to block gases and liquids in barrier seal systems.

AirCom seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly impact service life. We generally follow the standards specified by the Ministry of Petrochemical Industry. The technical requirements for pumps installing mechanical seals and their mating parts are as follows: 1) Shaft runout: maximum not greater than 0.05 mm; 2) Rotor wobble: near the shaft sleeve at the dynamic ring seal location, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if a shaft sleeve is present, it must not be loose; 4) Coupling alignment error: for gear couplings, not greater than 0.08–0.10 mm (P2008C); for elastic couplings, not greater than 0.05–0.06 mm; (common practice: face runout<0.05, radial runout(0.10) 5) The concentricity tolerance of the gland (static ring seat) sealing spigot relative to the shaft centerline is 0.05 mm, and the perpendicularity tolerance of the surface in contact with the gasket relative to the centerline is 0.03 to 0.05 mm. If these requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the dynamic ring O-ring is installed, and the ends of the gland (or housing) where the static ring O-ring is installed, should be chamfered and smoothed. 7) Exercise care when installing or removing mechanical seals; the use of hammers and flat chisels is strictly prohibited to avoid damaging seal components. If deposits prevent removal, clean thoroughly before attempting disassembly. 8) If mechanical seals are used at both ends of the pump, coordinate during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening has caused seal movement, the dynamic and static ring components must be replaced and must not be merely retightened for continued use. This is because loosening alters the original operating trajectory of the friction pairs, easily compromising the sealing integrity of the contact surfaces.

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