German Sterling SIHI seals, Sterling SIHI models, Sterling SIHI prices

Sterling SIHI seals are materials or components that prevent leakage of fluids or solid particles from 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 are classified into two main categories: static seals and dynamic seals. Their primary function is to prevent leakage of fluids or solid particles from adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to tightly closing the sealed chamber, sealed container, or seal used for letters and wills.

Sterling SIHI seal functions

Prevent high-pressure liquid from leaking out of the pump and prevent air from entering the pump. Although the shaft seal occupies a small space in the pump, the normal operation of the pump is closely related to the shaft seal. If the shaft seal is improperly selected, it will not only require frequent maintenance during operation and cause significant loss of the conveyed liquid, but may also cause fire, explosion, and poisoning accidents due to the leakage of flammable, explosive, and toxic liquids, with unimaginable consequences. Therefore, the shaft seal structure must be reasonably selected to ensure the safe operation of the pump. 1) Since the pressure inside the cylinder is not equal to the external atmospheric pressure, steam inside the cylinder or air outside the cylinder will inevitably leak out or in along the radial gap between the main shaft and the cylinder, causing working fluid loss, deteriorating the operating environment, and heating the journal or allowing steam to enter the bearing housing, causing oil deterioration. Air leakage also destroys the vacuum, thereby increasing the exhaust load. These factors will reduce the unit efficiency. For this reason, shaft seals are installed where the rotor passes through both ends of the cylinder. This type of shaft seal is called an end shaft seal, abbreviated as shaft seal. High-pressure shaft seals are used to prevent steam from leaking out of the cylinder, and low-pressure shaft seals are used to prevent air from leaking into the cylinder. 2) During turbine operation, a portion of steam will inevitably leak from the shaft end to the atmosphere, causing loss of working fluid and heat, and also affecting the working environment of the turbogenerator. If the adjustment is improper and the steam leakage is excessive, it will also cause the bearing temperature near the shaft seal to rise or water to enter the bearing oil. For this reason, shaft seal heaters are installed in various units to recover and utilize the shaft seal steam leakage from the turbine. 3) Prevent steam inside the cylinder and valve stem leakage from leaking outward, polluting the turbine room environment and bearing lubricating oil quality. Prevent high-temperature steam from flowing over the turbine main shaft during normal unit operation, causing it to heat up and thus causing bearing overheating. Prevent air from leaking into the vacuum part of the cylinder. Ensure the condenser vacuum effect and degree of vacuum during unit startup. Recover shaft seal and valve stem leakage to reduce working fluid and energy losses. 4) During turbine tripping shutdown and the entire hot shutdown process where the condenser needs to maintain a vacuum, prevent air from leaking into the turbine, which would accelerate internal cooling of the turbine and cause main shaft bending.

Sterling SIHI seal replacement steps

1) Remove the main pulley (belt drive) and remove the key pin; 2) Use a pin puller to remove the positioning pins of the shaft seal end cover; 3) Remove the fixing screws of the shaft seal end cover; 4) Use a circular external puller to remove the shaft sleeve (if no puller is available, cut a slot on the shaft sleeve with a cutting machine and knock it down with a chisel; note: use something to block sand to prevent it from getting into the screw rod); 5) Remove the old shaft seal; 6) Clean the end cover shaft seal and bearing positions, then clean with 755; 7) Apply 638 adhesive to the shaft seal installation position, then carefully install the shaft seal; note: do not damage the rubber lip; you can apply some oil or high-temperature grease to the rubber surface of the shaft seal; 8) After cleaning the shaft sleeve position, reinstall and fix the end cover securely (you can wrap a layer of thick glossy paper around the shaft to prevent the shaft seal lip from accidentally touching the keyway during end cover installation); 9) Clean the new shaft sleeve and installation position, apply fixing adhesive 638 to the inner circle of the shaft sleeve. Cold fit: Use a force bar to evenly knock the shaft sleeve in; place an outer ring of the same size outside the new shaft sleeve to cushion the knocking to avoid damaging the shaft sleeve. Hot fit: Clean the inside of the shaft sleeve thoroughly; there must be no oil. Apply a ring of 638 adhesive to the shaft journal before the shaft seal. Heat the shaft sleeve to 110 degrees and install it. (Note: Push the shaft sleeve to the edge of the shaft seal, pause briefly. Wait for the temperature to drop before pushing it into the shaft seal position); 10) Install the pulley or coupling, correct the parallelism or centerline, and manually reverse the machine head to allow lubricating oil to return to the front bearing and shaft seal.

Sterling SIHI seal common issues

Preventing leakage through effective sealing is a perpetual pursuit for chemical equipment. It is this requirement that has led to the increasingly widespread adoption of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage. For example, issues such as the service life of the isolation sleeve in magnetic drive pumps and the can in canned motor pumps, pitting corrosion of materials, the need for sealing materials with good corrosion resistance, and the reliability of static seals, among others. The following is a brief introduction to some basic situations regarding sealing: 1. Sealing types For static seals, there are usually only two types: gaskets and O-rings. Among O-rings, the O-type ring is the most widely used; for dynamic seals, chemical pumps rarely use packing seals, but primarily use mechanical seals. Mechanical seals are further classified into single-face and double-face, as well as balanced and unbalanced types. Balanced types are suitable for sealing high-pressure media (typically referring to pressures greater than 1.0MPa). Double-face mechanical seals are mainly used for media that are high-temperature, prone to crystallization, viscous, contain particles, or are toxic and volatile. For double-face mechanical seals, a barrier fluid should be injected into the seal chamber. Its pressure is generally 0.07 to 0.1MPa higher than the medium pressure. 2. Sealing materials For static seals in chemical pumps, fluororubber is generally used. PTFE materials are used only in special cases. The material configuration of the rotating and stationary rings in mechanical seals is critical. It is not necessarily best to pair cemented carbide with cemented carbide. High cost is one factor, and it is also unreasonable if there is no hardness difference between the two. Therefore, it is best to handle them differently according to the characteristics of the medium (Note: The American Petroleum Institute API610 Eighth Edition provides relatively detailed provisions for typical configurations of mechanical seals and piping systems in Appendix D).

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