Professional Dry Gas Mechanical Seal Manufacturers

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Dry gas seals are a type of mechanical seal used in various industries, including oil and gas, chemical, and petrochemical industries. These seals are designed to prevent the leakage of gas between the rotating and stationary parts of a machine, such as a compressor or pump.

There are many types of dry gas seals on Lepu dry gas seal manufacturers. Such as compressor gas seal, including centrifugal compressor dry gas seal, screw compressor dry gas seal, and also pump dry gas seal, sometimes there are some metal bellows dry gas seal, agitator dry gas seal.

Dry Gas Seals (DGS) are basically mechanical face seals consisting of a mating (rotating) ring and a primary (stationary) ring. During operation, grooves in the mating ring generate a fluid-dynamic force causing the primary ring to separate from the mating ring, thus, creating a “running gap” between the two rings. The running gap varies from 3 to 10 microns depending on the seal type.

Dry gas seals offer several advantages including increased reliability, reduced maintenance, and lower emissions. Dry Gas Mechanical Seals are also more resistant to contamination and can operate at higher speeds and pressures. However, they require a reliable source of clean and dry gas, and proper installation and maintenance are critical for their long-term performance.

Why are More and More Centrifugal Compressors Using Dry Gas Seal Technology?

Many compressors today are older than their predecessors, potentially preventing them from meeting the latest performance and environmental standards. Retrofitting these older units with the latest dry gas seal technology can improve operational performance, including reliability, service life, and productivity. Over 85% of centrifugal gas compressors manufactured today are equipped with dry gas seals. Because dry gas seals can also reduce a plant's environmental footprint while significantly reducing emissions.

Natural Gas STAR company have found that replacing these "wet" seals with dry seals significantly reduces operating costs and methane emissions.

Methane emissions from wet seals typically range from 40 to 200 standard cubic feet per minute (scfm). Dry seals, which use high-pressure gas to seal the compressor, emit less methane (up to 6 scfm), have lower power requirements, improve compressor and pipeline operating efficiency and performance, enhance compressor reliability, and require significantly less maintenance. A dry seal can save about $135,000 per year and pay for itself in as little as 14 months. For example, reduced emissions by 97 percent, from 75 to 2 Mcf per day, saving almost $80,000 per year in gas alone.

Economic And Environmental Benefits Of Dry Gas Seals

★ 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. Gas from the oil is usually vented to the atmosphere, bringing the total leakage rate for dual wet seals to between 40 and 200 scfm, depending on the size and pressure of the compressor.

★ Mechanically Simpler. Dry seal systems do not require elaborate oil circulation components and treatment facilities.

★ Reduced Power Consumption. Because dry seals have no accessory oil circulation pumps and systems, they avoid “parasitic” equipment power losses. Wet systems require 50 to 100 kW per hour, while dry seal systems need about 5 kW of power per hour.

★ Improved Reliability. The highest percentage of downtime for a compressor using wet seals is due to seal system problems. Dry seals have fewer ancillary components, which translates into 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).

★ Elimination of Oil Leakage from Wet Seals. Substituting dry seals for wet seals eliminates seal oil leakage into the pipeline, thus avoiding contamination of the gas and degradation of the pipeline.

Expore Dry Gas Seal Products

LEPU Seal is a leading dry gas seal manufacturer and supplier from China, offering a comprehensive range of dry gas mechanical seals designed for specific applications, ensuring reliability, safety and performance.

Dry Gas Seal DGS-919571

Dry gas seals are primarily used in centrifugal compressors, turbomachinery, and rotating equipment to prevent gas leaks. They utilize a thin layer of gas (typically the same as the compressed medium) to create a hermetic seal between rotating and stationary components. This non-contact seal minimizes wear and reduces the risk of leakage, thereby improving the efficiency and reliability of the compression process.

LPGAS Dry Gas Seal For Centrifugal Compressor

Tandem Dry Gas Seal tandem design

A tandem dry gas seal is a type of dry gas seal that is used in turbocompressors. It is the most common seal in turbocompressors1. The tandem seal is generally used in natural gas applications due to the minimal leakage to atmosphere2. The intermediate labyrinth purged with nitrogen (to eliminate fugitive emissions) is nearly always recommended. The primary vent is between the two seals and usually connected to the flare system1.

LEPU Dry Gas Mechanical Seal For Pump & Compressor

Dry Gas Seal For Chemical Industry Pump LPDGS21

A dry gas seal is a non-contact shaft sealing device widely used in chemical pumps that transport toxic, flammable, explosive, or expensive media. It creates a micron-sized gas film through the dynamic pressure effect of gas, achieving zero leakage or escape of the sealed medium.

Replacement Dry Gas Seal LPDGS 801 For Centrifugal Compressors

A perfect replacement for john crane or flowserve dry gas seal, from China LEPUSEAL

Flowserve Gaspac Dry Gas Seals

The GASPAC seal is a proven design using either the bi-directional T-Groove technology or the Advanced Pattern Groove (APG) technology.

Learn about the advantages of LEPU wet-to-dry gas seal retrofit

As a professional dry gas seal manufacturer, we assist our customers through every step of the retrofit process, from concept study to implementation, ensuring they maximize efficiency and reliability when transitioning to dry gas seals. Contact us today for a comprehensive dry gas seal retrofit guide and product quote!

Select the appropriate retrofit target
Compile necessary technical information
Find dry gas seal technology experts
Align the retrofit with sustainability initiatives
Verify data before finalizing the design
Maintain legacy seals and systems

3 Steps for Converting to Dry Seals

Step 1 >

Identify candidates for wet seal replacement.

Operators should make a comprehensive inventory and technical evaluation of their existing compressors. Factors to consider include compressor type, age, hardware, and operating conditions. All wet seal compressors should be identified and evaluated for dry seals.

Step 2 >

Estimate the savings of a dry seal retrofit.

In general, the majority ofsavings from replacing a wet seal with a dry seal are attributable to reduc-tions in methane gas loss. To estimate these savings, partners can measurethe majority of methane loss from their wet seal compressors at the ventfrom the seal oil degassing unit by bagging or using a high flow sampler.

Step 3

Determine the costs for conversion to dry seals.

Detemine the costs for converslon to dry seals, The cost for a dryseal system will depend on compressor operating pressure, shaft size, rota-tion speed, and other installation-specific factors. Costs for the seal typicallyrange between $5,000 and $6,000 per inch of shaft diameter for wet seals and $8,000 to $10,000 per inch for tandem dry gas seals. These costs will dou-ble for beam type compressors (two seals).

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Guangzhou Lepu Machinery Co., Ltd.

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No. 5, Yunkai Road, Huangpu District, Guangzhou, China

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+86-020-36158139
+86-020-36158280

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mark@lepuseal.com

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Fax: +86-020-36158281

Contact Person: Mr. Mark Ao
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As a professional mechanical seal manufacturer, Lepu Seals is committed to providing complete mechanical seal solutions. We offer a wide range of sealing solutions for pumps in a variety of applications, including wastewater treatment, oil and gas, power generation, chemical, and other industries. We have provided mechanical seals to over 1,000 customers, with over 150 of them enjoying long-term partnerships. As the most widely used seal in the industry, our warehouse always has a sufficient supply of John Crane mechanical seals, and our capabilities ensure fast delivery.