The Type 2874NE is a new standard for reliability and gas sealing performance. This non-elastomer, high-temperature seal features unique outward pumping spiral groove technology and eliminates problems such as coking barrier fluids and fouled heat exchangers in hot applications.

Full reverse pressure containment is a key design feature of the Type 2874NE.  In the event of system upset or barrier pressure loss, the inboard seal is process pressure activated to close.  The 2874NE will continue to function as a contacting seal protecting the barrier chamber, system and environment from exposure to the process fluid. 

As part of our commitment to customer service, John Crane has invested in a number of Advanced Service Centers that provide individual countries with their own dedicated Center of Excellence in gas seal service, repair and testing. Having these state-of-the-art centers located centrally for our customers can significantly reduce turnaround times, improve service and allow for local access to the sealing expertise that only the acknowledged leader in sealing technology can bring.

The acquisition of SBT allows John Crane to expand their global sales and service network to offer customers a wider range of solutions that will complement John Crane's existing mechanical sealing solutions, couplings and associated technologies and enhance relationships with existing customers.

The number of rings may vary from application to application depending on the objective of the sealing system. A lantern ring is used on most applications to introduce a lubricant to the packing. Packing rings from the lantern ring to the bottom of the box seal the fluid being pumped. The packing rings between the gland and lantern ring seal the lubricant used with the system.

All of this changed in the 1960s when John Crane Inc. introduced the world to a revolutionary new piece of sealing technology-the non-contacting dry gas seal. The seal uses a spiral groove seal face with a sealing dam on the inside diameter to provide resistance to gas flow and allow pressure to build up at the bottom of each groove, separating the seal faces. This separation allows a small amount of gas to flow across the seal faces and keep them cool and non-contacting, thereby minimizing the detrimental effects friction can have on a seal face.

The one-piece seal is mechanically loaded in the axial direction by a gland follower and can be installed easily in new or existing equipment without any modifications.

A unique industry resource responsible for the training of thousands of professionals, the Academy was founded to expand the knowledge and skill levels of customers interested in achieving maximum return on their mechanical seal investment.

In response to its growing acceptance as well as environmental demands, power plants have integrated natural gas as a means to run their gas turbines, which in turn powers the generator in order to produce power — all in a clean fashion. Keeping other components — such as the all important compressor — free of contaminants is essential. As such, there is little argument that compressor reliability and uninterrupted operation are paramount and crucial to plant operation. Although there are countless vendors and compressor sizes continue to increase and their specifications advance, spare compressors simply aren't an option for most because of their cost. Further, operating requirements, such as pressure rating and speed, continue to expand beyond original intent, resulting in compressors being taxed beyond their design capabilities.

One means to improve reliability though is with the integration of dry gas seal technology. Proven as a solution for almost two decades on thousands of installed bases, the dry gas seal has been shown to improve compressor and plant reliability, as well as product quality. However, key to success in achieving optimum reliability is selection of the right dry gas seal and control system as well as a commitment to training and commissioning/operational procedures.

John Crane recognized the importance of meeting increased product test requirements. As such, it was crucial to expand the testing infrastructure to meet current and future industry demands.

Dramatic business growth in the past year, combined with the success of the first installation, made this the obvious choice for capacity expansion.

For more than six decades, Sealol® brand metal bellows seals have been recognized for their excellent performance capabilities and sealing reliability integrity in a wide range of industrial rotary shaft applications. With three basic seal designs to choose from – elastomer bellows, metal bellows and PTFE bellows – the differences are significant and establish their unique performance capabilities in terms of pressure, temperature and fluid application range.

According to Colin Munro, John Crane sales representative, a John Crane Type 37FSB mechanical seal, installed in 1991 at a large water pollution control plant located at the southern tip of San Francisco Bay, Calif., is still in operation.

• The factory assembled H-CE hub/flex units are designed to accommodate typical machine shaft sizes for turbo compressor applications
• The separate spacer on the H-CE can be varied to provide the appropriate distance between shaft end and the required torsional stiffness to suit individual applications
• On some applications, the H-CE hub assembly on a compressor or gearbox input shaft is combined with the flanged H-FE arrangement for a turbine driver

For more information please visit www.metastreamcouplings.com