Carbon Ceramic Mechanical Seal

Mechanical shaft seals this section briefly describes the design and elements of the mechanical shaft seal.

Carbon ceramic mechanical seal.

Ceramic standard on cast iron pumps. They come furnished as two pieces the seal and the seat. The majority of seals used in pumps are typically carbon ceramic. 3 4 type 21 fluorocarbon ceramic vs.

Mechanical seals come in a wide range of designs however the most important factor when determining how long a seal is going to last. Overview of ceramic seal materials. 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. Once in a while the ph is too high for the carbon ceramic seal material.

Carbon ceramic ni resist 17 4 silicon carbide tungsten carbide gfptfe glass filled ptfe. Machine lapping is the production method of lapping mechanical seal faces. Tion of a mechanical seal. Systems with high ph levels.

This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators turbines compressors centrifuges and blowers. The seal is comprised of the case spring diaphragm and washer which come locked together as one piece. Kemet lapping systems are used in both manufacturing and reconditioning processes. It is chemically inert and can be applied to nearly any product.

These seals work well with the temperatures mentioned above and a ph neutral range of 7 0 9 0. Common types of mechanical seal face. As previously stated a pump with a through shaft is not leakproof. The most common types of seal faces are.

Carbon is standard on 316ss pumps. Ceramic cannot however handle the thermal shocks don t drop them that ni resist or 17 4 seats can. Most hvac applications maintain a ph from 7 0 to 9 0. Ceramic generally a 99 5 aluminum oxide offering excellent wear characteristics due to it s hardness.

The role of the mechanical carbon differs with this high end mechanical seal and the resulting recipe is unique for these types of seals. 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. 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. Carbon tungsten carbide ceramic silicon carbide chrome oxide stellite ni resist and phosphor bronze.

For use in waste water boiler feed and compressor pumps these seals have an extra long spring that accommodates variations in seal cavity length. 3 4 type 21 buna carbon vs. Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. The seat is comprised of the seat and the gasket.