description John Crane Type 28AT Overview
The John Crane Type 28AT is a non-contacting, dry-running mechanical seal designed for agitators and mixers, utilizing advanced spiral groove technology.
insights Ranking position
John Crane Type 28AT ranks #45 of 137 in the Seal ranking, behind EagleBurgmann MG1, ahead of SKF HDDF.
help John Crane Type 28AT FAQ
Is the John Crane Type 28AT an agitator seal?
No, John Crane identifies the Type 28AT as a dry gas seal for turbo compressors. Its Type 7828 family, not the 28AT, is designed specifically for mixers and agitators.
How does the Type 28AT operate without its faces touching?
Spiral grooves on the rotating face draw gas inward and create pressure that separates the sealing faces. John Crane specifies a normal operating gap of about 5 microns, which minimizes face wear.
Which Type 28AT arrangements are available?
John Crane offers the seal in single, tandem and double configurations. The appropriate arrangement depends on the compressor gas, allowable leakage and required containment.
What replaced the seal-oil system in a Type 28AT installation?
The Type 28AT uses a controlled gas film instead of circulating seal oil between contacting faces. This avoids seal-oil contamination and allows leakage gas to be vented, recovered or returned to the process.
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