Product category:
Seals
News Release from: John Crane | Subject: Type 28ST non-contacting seal
Edited by the Engineeringtalk Editorial
Team on 09 August 2001
Non-contacting seal for steam turbine
drivers
John Crane has introduced a non-contacting seal, Type 28ST, for steam turbine drivers, eliminating loss of valuable steam energy leakage caused by corrosion and shaft damage
John Crane has introduced a non-contacting seal, Type 28ST, for steam turbine drivers, eliminating loss of valuable steam energy leakage caused by corrosion and shaft damage, solving these regular problems when the steam condition is pure and super-heated By improving bearing reliability, which normally accounts for 80% of unplanned turbine downtime, these seals can reportedly provide cost-savings of some £7000 to £17,000 per driver per year
This article was originally published on Engineeringtalk on 29 May 2000 at 8.00am (UK)
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Cartridge seal cuts costs and product leakage
The John Crane 4610 cartridge seal reduces maintenance and running costs, product leakage and equipment downtime.
Originally designed for centrifugal compressors, the seal's advanced spiral groove technology was refined specifically for steam turbines.
Positioned on the rotating seal face, the spiral grooves pump steam to the root of the groove and toward a non-grooved portion of the seal face, creating a sealing dam that provides resistance to flow and increases pressure.
The pressure generated separates the sealing faces by a precise amount, which adjusts to maintain seal face equilibrium as operating parameters change.
Steam leakage is reduced to less than 5% by the patented non-contacting design, compared to traditional sealing devices such as segmented carbon rings and labyrinths.
The non-contact design handles temperatures up to 400C, speeds up to 120m/sec and pressures up to 27.6 bar g.
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