Dry Running Mechanical Seal

A: Dry seals have fewer ancillary components, which translates to higher overall reliability and less compressor downtime. Lower Maintenance. Dry seal systems have lower maintenance costs than wet seals because they do not have moving parts associated with oil circulation (e.g., pumps, control valves, relief valves).

A: Dry gas seals are in the positive seal class and have the same basic design features as mechanical face seals, with one significant difference. The dry gas seal has shallow grooves cut in the rotating seal face located part way across the face.

A: These seals are basically used on top entry agitators for food and pharmaceutical industries where contamination of the media with any other liquid inside the agitator is not permissible. These seals do not require any external lubrication to the seal faces, hence these seals are known as dry running seals.

A: Reduced Operating Costs: Energy costs drop significantly, since seal oil pumps and degassing tank heating systems are not required when using dry gas seals. Power losses due to shear forces in gas seals are much lower than losses experienced in oil seals, which results in energy savings as well.

A: Dry gas seals are generally non-contacting, dry-running face seals, mainly used in high speed applications. Compressors in a natural gas transfer and distribution network is a common example where dry gas seals are routinely used.

A: And some pumps, if operated correctly, can provide 2-3 years or more of good seal life. Other companies will choose to purposefully run their mechanical seals to the point of failure to reduce their preventive maintenance expenditures.

A: Lubrication is necessary for proper mechanical seal installation. Lack thereof can damage o-rings or rubber bellows on the seal, causing them to tear, or roll. There are many options available, from petroleum jelly, to silicon grease, to special lubricants.

A: The most common type of mechanical seal used in various industries is the single mechanical seal. Single mechanical seals are widely employed in pumps, mixers, and other rotating equipment to prevent leakage of fluids (such as water, oil, or chemicals) between the rotating shaft and the stationary housing.

A: A leakage rate of 10 drops per hour or less per seal is considered an acceptable leak rate for mechanical seal pumps manufactured in our North American or European facilities.

A: The rings within dry gas seals are made up of graphite, tungsten carbide, or another substance with low friction properties. Conversely, wet gas seals use a liquid film to help prevent leakage, typically delivered by a pressurized system that helps keep the space between the two sealing surfaces lubricated.

A: Generally, under optimal conditions, a well-maintained mechanical seal can last anywhere from 1 to 3 years before requiring replacement or maintenance. However, it's important to note that the actual service life can vary significantly based on several factors.

A: Contrary to "wet" mechanical seals, in dry gas seals there is no contact between the faces so overheating, or actually, any frictional heat, does not occur. There is a very small gap that separates the rotary and stationary faces.

A: Reduced Operating Costs: Energy costs drop significantly, since seal oil pumps and degassing tank heating systems are not required when using dry gas seals. Power losses due to shear forces in gas seals are much lower than losses experienced in oil seals, which results in energy savings as well.

A: Gas Leak Rates. During normal operation, dry seals leak at a rate of 0.5 to 3 scfm across each seal, depending on the size of the seal and operating pressure. While this is equivalent to a wet seal's leakage rate at the seal face, wet seals generate additional emissions during degassing of the circulating oil.

A: When choosing a mechanical seal, consider application requirements, pressure rating, rotational speed, temperature range, and compatibility with the media and equipment. These factors are pivotal in ensuring optimal performance and longevity of the seal.

A: Dry running mechanical seals are innovative sealing solutions designed to operate without the need for external lubrication or fluid support.

A: Advantages of Dry Gas Seals:
Reduced Maintenance: Dry gas seals have a longer operational life and require less maintenance than oil-lubricated seals. Improved Efficiency: They help maintain compressor efficiency by minimizing gas losses and reducing energy consumption.

A: These seals are typically used in a harsh working environment such as oil exploration, extraction and refining, petrochemical industries, gas transmission and chemical processing. Machined-in lift profiles on one side of the seal face direct gas inward toward an extremely flat portion of the face.

A: According to the arrangements of sealing faces, there are five types of seals, single seal, double seal, tandem seal, tandem seal with intermediate labyrinth, tandem seal with prepositive labyrinth.

A: The biggest advantage to mechanical seals over pump packing is the minimal amount of maintenance. Packing requires frequent adjustment and replacement, not to mention the upkeep that comes with constant leaking.