Carbon Ceramic Mechanical Seal

As previously stated a pump with a through shaft is not leakproof.

Carbon ceramic mechanical seal.

Kemet lapping systems are used in both manufacturing and reconditioning processes. 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. Carbon ceramic ni resist 17 4 silicon carbide tungsten carbide gfptfe glass filled ptfe. Mechanical seals come in a wide range of designs however the most important factor when determining how long a seal is going to last.

3 4 type 21 fluorocarbon ceramic vs. These seals work well with the temperatures mentioned above and a ph neutral range of 7 0 9 0. Carbon is standard on 316ss pumps. The mechanical shaft seal is essentially a throttle arranged around the shaft.

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. This is commonly seen in centrifugal pumps although this challenge also exists in other equipment such as agitators turbines compressors centrifuges and blowers. Once in a while the ph is too high for the carbon ceramic seal material.

The most common types of seal faces are. Ceramic cannot however handle the thermal shocks don t drop them that ni resist or 17 4 seats can. The seal is comprised of the case spring diaphragm and washer which come locked together as one piece. 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 seat is comprised of the seat and the gasket. They come furnished as two pieces the seal and the seat. Overview of ceramic seal materials. Machine lapping is the production method of lapping mechanical seal faces.

Ceramic standard on cast iron pumps. 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. Often called teflon r. Carbon tungsten carbide ceramic silicon carbide chrome oxide stellite ni resist and phosphor bronze.

Seal basics a mechanical seal is a device used to seal the interface between a rotating shaft and a stationary housing figure 1. Common types of mechanical seal face. It reduces leakage between the pump and the surroundings to an absolute minimum. Ceramic generally a 99 5 aluminum oxide offering excellent wear characteristics due to it s hardness.

It is chemically inert and can be applied to nearly any product. Systems with high ph levels. Most hvac applications maintain a ph from 7 0 to 9 0. Tion of a mechanical seal.