TET 10-14 seals, German thorsman model TET 10-14 price

TET 10-14 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 rotation axis, 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. It mainly consists of 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.

TET 10-14 seal 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. The common mechanical seal structure consists of components such as the stationary ring (static ring), rotating ring (dynamic ring), elastic element spring seat, set screws, rotating ring auxiliary O-ring, and stationary ring auxiliary O-ring. Anti-rotation pins are fixed to the gland 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.

TET 10-14 seal system composition

1) Seal chamber: In the past, seal chambers housing mechanical seals were stuffing boxes designed for soft packing seals. They are not suitable for housing mechanical seals, not only because the dimensions are too small and the clearances too narrow, but also because the simple cylindrical shape is inappropriate. Standards for enlarged mechanical seal chambers have been established abroad. In addition, companies such as Durametallic in the US and the Fluid Engineering Study Group in the UK are studying reasonable 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) Volatile emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while ignoring the control of invisible volatile emissions. This resulted in environmental pollution and posed risks to equipment and personnel. Abroad, organizations such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the US have developed guidelines for controlling volatile emissions in rotating machinery, compressors, and screw systems 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 is used between dual seals as a lubricant or buffer, 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, flushing, and other systems. Pump circulation needs optimization, and condition monitoring systems are being studied and resolved. The integration of auxiliary systems is specified in the API-682 standard. 4) Gas barrier seal system: In the past, liquid-blocking-liquid or liquid-blocking-gas configurations were commonly used in barrier seal systems. To simplify bulky barrier liquid systems, barrier gases are now used to block liquids or gases. In gas-blocking seal systems, spiral groove gas seals with barrier gas, floating bushings with barrier gas, etc., can be used to block gases and liquids.

TET 10-14 seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly impact their service life. We generally follow the standards specified by the Ministry of Petrochemical Industry. The technical requirements for the pump and the mating parts of the mechanical seal during installation are as follows: 1) Shaft bending: maximum not greater than 0.05 mm; 2) Rotor runout: 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) Concentricity tolerance of the gland (stationary ring seat) sealing register relative to the shaft centerline: 0.05 mm; perpendicularity tolerance of the surface contacting the gasket relative to the centerline: 0.03–0.05 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 stationary ring O-ring is installed, should be chamfered and smoothed. 7) Exercise care when installing or removing mechanical seals. Do not use hammers or flat chisels to avoid damaging seal components. If scale prevents removal, clean thoroughly before 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 rotating and stationary ring components must be replaced. Do not simply retighten and continue use, as loosening alters the original operating trajectory of the friction pair, easily compromising the sealing integrity of the contact surfaces.

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