Carbon Ceramic Mechanical Seal

This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators turbines compressors centrifuges and blowers.

Carbon ceramic mechanical seal. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. Carbon tungsten carbide ceramic silicon carbide chrome oxide stellite ni resist and phosphor bronze. The majority of seals used in pumps are typically carbon ceramic. Tion of a mechanical seal.

3 4 type 21 buna carbon vs. The mechanical seals provided by bell and gossett have stainless steel metals buna elastomers a 99 5 pure aluminum oxide ceramic stationary seal face and a carbon rotating face. They come furnished as two pieces the seal and the seat. Carbon is standard on 316ss pumps.

The seat is comprised of the seat and the gasket. 3 4 type 21 fluorocarbon ceramic vs. Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal. Ceramic cannot however handle the thermal shocks don t drop them that ni resist or 17 4 seats can.

It is chemically inert and can be applied to nearly any product. Once in a while the ph is too high for the carbon ceramic seal material. For use in waste water boiler feed and compressor pumps these seals have an extra long spring that accommodates variations in seal cavity length. Overview of ceramic seal materials.

Common types of mechanical seal face. These seals work well with the temperatures mentioned above and a ph neutral range of 7 0 9 0. The seal is comprised of the case spring diaphragm and washer which come locked together as one piece. In most applications carbon ceramic seals work fine but there are certain circumstances when a different type of material for the mechanical seal should be specified.

Systems with high ph levels. Most hvac applications maintain a ph from 7 0 to 9 0. The role of the mechanical carbon differs with this high end mechanical seal and the resulting recipe is unique for these types of seals. Ceramic generally a 99 5 aluminum oxide offering excellent wear characteristics due to it s hardness.

Machine lapping is the production method of lapping mechanical seal faces. Kemet lapping systems are used in both manufacturing and reconditioning processes. Carbon ceramic ni resist 17 4 silicon carbide tungsten carbide gfptfe glass filled ptfe. As previously stated a pump with a through shaft is not leakproof.

It reduces leakage between the pump and the surroundings to an absolute minimum. Ceramic standard on cast iron pumps. Carbon is also a critical component in some of the hard face materials used in mechanical seals because it combines with metals at high temperatures to form metallic carbides. The mechanical shaft seal is essentially a throttle arranged around the shaft.