Dry Gas Seal DGS 919571

The problem with an ordinary contacting mechanical seal or “wet” seal is the risk of seal faces overheating at high speed, especially if high speed is combined with high pressure. A common 6500 rpm 70 bar application would be very tough for a wet seal to handle. At such high pv factors, a mechanical seal must have bigger allowed leakage of Plan 54 barrier fluid to prevent overheating and failure. The normally leaking oil is directed back to the oil tank, but not all of it may be collected. Some quantity of the barrier fluid will get into the process (through compressor and into the pipeline), contaminating the transferred gas. In some applications it is “just” loss of oil, easily 1-3 barrels per day. In other industries, contamination with oil involves other cost, for example, contamination of catalyst by a hydrogen recycle compressor at an oil refinery would be to expensive.

In contrast to "wet" mechanical seals, dry gas seals have no contact between the sealing faces. These seals are known as non-contacting, dry-running face seals and are primarily used in high-speed applications. These components include a stationary seal, a rotating seal, and an environmental control system. The stationary seal is typically mounted on the housing, while the rotating seal is mounted on the shaft. The environmental control system regulates the seal's internal environment and is crucial for preventing gas contamination or leakage, meeting the high standards set by API 617.

Dry gas mechanical seals rely on a thin gas film to operate, forming a barrier that prevents any gas from escaping to the external environment. This design not only ensures high efficiency but also minimizes the risk of contamination or leakage, a common problem in the dry gas mechanical seal industry for high-pressure applications.

Unique Features：

● Compact and Easy to Install: Designed for minimal axial and radial space.

● Non-contacting sealing faces: Ensures friction-free sealing faces, extending durability.

● Robust metal bellows design: Prevents shaft/sleeve wear and accommodates high speeds.

● Minimal parts: Simplifies installation and reduces downtime.

● Security standards: Complies with LOX security protocol.

Dry Gas Seal DGS 919571 Design:

1. Patented bidirectional groove design

2. Patented rotary seat centering

3. Liquid-phase sintered silicon carbide

4. Internal theoretical gas film modeling

5. Single DGS - for restrictive applications

6. Double DGS - for low-pressure applications where zero emissions are essential

7. Tandem DGS - when lower emissions and a high-pressure solution are required (optional, no intermediate labyrinth)

8. Carbon ring split seal - for protecting the dry gas seal from bearing oil intrusion

9. Carbon ring process seal - for minimizing clean gas flow and maintaining a clean process-side environment