German DOSAPRO seals DOSAPRO models DOSAPRO prices

DOSAPRO seals are materials or components that prevent leakage of fluids or solid particles from between adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30°C to avoid high-temperature aging. Seals can be divided into two main categories: static seals and dynamic seals. Their primary function is to prevent leakage of fluids or solid particles from between adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to the tight closure of sealed chambers or containers, used for sealing letters and wills with stamps.

DOSAPRO seal features

1) No need to measure the seal working length during installation; 2) The shaft can be adjusted at any time; 3) No leakage occurs during startup because the seal has been pre-tested; 4) Installation only requires tightening the seal cover bolts, ensuring easy assembly quality control; 5) Protects the sealing surface from contamination by debris or damage due to operational errors before installation or startup; 6) Can be readjusted after thermal expansion of the machinery; 7) Self-centering through fit; 8) Easy removal of the seal for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends cartridge mechanical seals for all mechanical seals.

DOSAPRO seal startup preparation

1) Comprehensive inspection of the mechanical seal, auxiliary devices, and pipeline installation to ensure completeness and compliance with technical requirements. 2) Perform a static pressure test before starting the mechanical seal to check for leakage. If there is significant leakage, identify the cause and eliminate it. If ineffective, dismantle, inspect, and reinstall. The general static test pressure is 2~3 kg/cm². 3) Rotate the pump according to its direction to check for smooth and uniform movement. If rotation is difficult or stuck, check for incorrect assembly dimensions or improper installation.

DOSAPRO 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 tank, wasting working medium 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, seriously threatening 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 can cause intense heating at the shaft end gland and rotor gland sections, resulting in localized stress concentration and deformation. This may alter the gap between the rotor and cylinder, increasing steam leakage from the shaft seal and differential expansion, potentially causing serious friction between stationary and rotating parts. When the shaft seal temperature is too low, the shaft end gland and rotor gland sections are cooled, also causing localized stress concentration, altering the gap between the cylinder and rotor, increasing shaft end leakage, and reducing differential expansion. Low shaft seal temperature may also result in wet steam in the shaft seal supply, causing water hammer in the supply pipeline. In severe cases, this can lead to water ingress into the turbine.

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