宜春Research on Material Selection and Reliability Issues of API682 Mechanical Seals?

Research on Material Selection and Reliability Issues of API682 Mechanical Seals

API682 mechanical seals are widely used in the industrial field, and the selection of materials is crucial for the reliability of the seal.

In terms of material selection, multiple factors need to be considered:

Friction pair material

Common ones include silicon carbide, tungsten carbide, graphite, etc. Silicon carbide has high strength and good wear resistance, but the cost is relatively high. Tungsten carbide has high hardness, but also relatively high brittleness. Graphite has self-lubricating properties, but may not be wear-resistant enough under certain operating conditions.

For example, in high-speed, high-pressure, and corrosive working conditions, silicon carbide may be chosen as the material for the dynamic ring, while graphite may be used for the static ring.

Auxiliary sealing ring material

Commonly used are rubber (such as nitrile rubber, fluororubber), polytetrafluoroethylene, etc. Nitrile rubber has a lower price and better oil resistance, but limited high temperature and corrosion resistance. Fluororubber has excellent high temperature resistance and corrosion resistance. Polytetrafluoroethylene has high chemical stability, but relatively poor elasticity.

For example, in environments with high temperatures and corrosive media, fluororubber may be used as an auxiliary sealing ring.

Spring material

Stainless steel springs (such as 304, 316, etc.) are a common choice with good corrosion resistance and elasticity. Some special working conditions may also use high-temperature resistant alloy springs.

For example, under normal working conditions, 316 stainless steel springs can meet the requirements; In high-temperature environments, high-temperature alloy springs may be used.

The impact of material selection on the reliability of mechanical seals is mainly reflected in the following aspects:

Wear resistance

Appropriate friction pair materials can reduce wear, extend the service life of seals, and improve reliability.

If the wear resistance of the material is insufficient, the sealing surface is prone to wear, leading to leakage.

Corrosion resistance

The corrosiveness of the medium can corrode the sealing material. Choosing materials with good corrosion resistance can ensure long-term stable operation of the seal in harsh environments.

For example, in highly corrosive media, if the material is not corrosion-resistant, it will quickly fail.

Temperature adaptability

The high temperature resistance of different materials varies. Under high temperature conditions, if the material cannot withstand high temperatures, problems such as deformation and aging may occur, affecting the sealing performance.

For example, rubber seals may lose their elasticity at high temperatures, leading to seal failure.

Elasticity and resilience

The elasticity and resilience of springs and auxiliary sealing rings are crucial for maintaining the pre tension and compensating ability of the seal.

Insufficient elasticity of the material can lead to unstable sealing pressure, affecting the sealing effect.

In summary, when studying the material selection and reliability issues of API682 mechanical seals, it is necessary to comprehensively consider factors such as working conditions, material performance, and cost, in order to select the appropriate material combination to ensure the reliability and long service life of the mechanical seal.