Type *8XP: Possibly the most popular seal in the range today, the Type *8XP builds on the *8AT design and seals medium to high pressures with improved chemical resistance. It can also operate over a wider temperature range and is increasingly the preferred product for large sizes, and for applications requiring slow roll and coast-down conditions. Type *8 compressor dry-running gas seals have been the industry standard since early ***0 for gas-handling turbomachinery. Utilizing John Cranes patented spiral groove pattern, these seals are non-contacting in operation. During dynamic operation, the mating ring/seat and primary ring/face maintain a sealing gap of approximately 0.***2"/5 microns, thereby eliminating wear. These seals eliminate seal oil contamination and reduce maintenance costs and downtime. Single, tandem and double seal arrangements are available.