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Seal face in good shape after six years’ hard use
The durability and performance provided by John Crane mechanical seals has been proven during a recent scheduled maintenance shut down at a paper plant in Canada. A Crane Safematic seal was removed from the plant as a preventative maintenance measure after providing six years of reliable, leak-free service. This is all the more remarkable as the seal was fitted to a pressure screen that is one of largest of its kind in the world, and when removed the seal faces were in good shape with only minimal signs of wear.
The mill, in Dryden, Ontario, produces uncoated free-sheet paper. In 2001 the mill installed a Valmet TLA-1800 pressure screen to feed stock to its paper machine. A Crane Safematic SAF 230 TREN seal was fitted to a 230mm dia.
shaft which serves the screen, and despite operating in the harsh environment of a paper mill, the seal handled a rotation speed of 92.4rpm and 323 Kpa pressure for six years without a single problem.
A number of other John Crane Safematic products in use on this process, including a Safefilter, also contributed to the seal’s impressive operational life.