Germany LARIUS seals LARIUS models LARIUS prices

LARIUS 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, the gland bolts are tightened, and the cartridge positioning tabs are removed, allowing the mechanical seal to operate in a parallel face condition and be put into service. This not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all made as cartridge seals, possessing the aforementioned advantages. Cartridge seals are also a type of cartridge mechanical seal. In this type of seal, the stationary ring, rotating ring, shaft sleeve, gland, and auxiliary seals are all assembled together with a shaft sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easy to ensure installation and assembly quality.

LARIUS 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 at startup because the seal has been pre-tested; 4) During installation, only the seal cover bolts need to be fitted and tightened, making it easy to ensure assembly quality; 5) Protects the sealing faces 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 to remove the seal for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends the use of cartridge mechanical seals for all mechanical seals.

LARIUS seal startup preparation

1) Conduct a comprehensive inspection of the mechanical seal, as well as the completeness of the installation of auxiliary devices and pipelines, to ensure they meet technical requirements. 2) Perform a static pressure test on the mechanical seal before startup to check for leaks. If there is significant leakage, identify the cause and take measures to eliminate it. If this is ineffective, disassemble, inspect, and reinstall. The general static test pressure is 2~3 kg/cm². 3) Rotate the pump according to its direction of rotation to check if it moves lightly and evenly. If rotation is difficult or stuck, check for errors in assembly dimensions and reasonable installation.

LARIUS seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily 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 will trigger the action of the equalizing box safety valve, wasting working fluid and damaging equipment. Too 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, resulting in local stress concentration and certain deformation. This may change 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 local stress concentration, changing the clearance between the cylinder and rotor, increasing steam leakage at the shaft end, 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 shaft seal supply pipeline. In severe cases, this can cause water ingress into the turbine.

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