约翰克兰John Crane2800E培训指南.pdf

2800E Non-Contacting, Gas Lubricated Seals for Small-Bore Rotating Equipment 2800 Series John Crane’s gas lubricated, non-contacting Type 2800E Series seals The John Crane Type 2800E is a non- contacting dual seal for non-turbo small- bore rotating equipment applications, meeting the requirements of standards such as ISO3069C and DIN 24960. As the world leader in spiral groove technology, John Crane has more than 15,000 Type 2800E Series spiral groove seals in use in over 50 countries worldwide, with over 100 million hours of operational time. Fugitive pump emissions are contained safely throughout the long life of your John Crane seal • Highest reliability in sealing volatile fluids • Positive sealing of high purity fluids with virtually no process contamination • No damage to pump from corrosive fluids leakage • Zero emissions to atmosphere • Simple to install • Pump cavitation and dry-running does not affect seal performance • Low running costs • Low energy usage Our technology for your benefit Patented John Crane spiral grooves are machined into the mating ring faces. A suitable pressurised inert gas is injected between the seals. As the shaft rotates, gas flows into the tip of the spiral groove and is compressed at the sealing dam, the ungrooved portion of the mating ring. At the sealing dam, gas is expanded. The resultant film pressure gives an opening force greater than the closing force, thus separating the faces. The Type 2800E Series spiral groove continues to operate, even if barrier gas pressure is momentarily lost, maintaining the gas film between the barrier gas and the process. As a result of this unique technology, you achieve zero emissions, plus: • MTBPM extended up to 10 times. Several chemical companies have documented that their Mean Time Between Planned Maintenance (M