Power Transmission Couplings, Hydrodynamic Bearings and More for Power Generation | John Crane
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Power Generation

Power generation plants vary greatly across the industry, from those fueled by coal or natural gas to those powered by nuclear, hydroelectric or geothermal energy. But though they operate differently, they still share a common goal: to meet the growing demand for energy in a responsible, efficient way. John Crane’s depth and breadth of applied engineering expertise, product innovation and reliability services help plants of all types increase uptime, reduce emissions and improve efficiency to achieve all of their goals.

We deliver proven mechanical seal technologies and services that improve power plant manufacturing performance through:

  • Increased operational reliability
  • Improved equipment uptime
  • Fewer maintenance interventions
  • Reduced seal water usage and energy consumption
  • Cost-effective environmental compliance

Tested Designs, Proven Solutions

For 100 years, John Crane has supported the power generation industry with reliability-tested solutions. Because John Crane mechanical seals operate in mission-critical power generation applications, our seal designs have been carefully tested under simulated in-plant conditions to ensure dependability in demanding situations. Our test centers can also perform chemical analyses and material compatibility evaluations specific to power generation applications.

All John Crane products are manufactured and certified in accordance with the most recent environmental, regulatory and technical standards around the world:

  • ANSI/ASME N45.2
  • ASME NCA-3800
  • CMTR
  • ISO 9000
  • GOST R
  • ATEX
  • ISO 9001
  • ISO 14001
  • 10 CFR 21
  • 10 CFR 50, Appendix B
  • ASME VIII div.1, PED(97/23/EC)

And our commitment to reliability doesn’t stop at quality components. With 200+ global rapid-response centers, we have one of the most reliable support and repair services in the world.

Power Generation Products

Many John Crane products specifically address the needs of the power generation industry by improving the productivity and performance of mission-critical operations:

O-ring Pusher Seals

Heavy-duty Type 270F and Type 48 Seals: Designed for critical high-pressure, high-temperature and high–shaft speed applications; used for boiler feedwater, circulation or start-up pumps and other high-energy applications

Type 5600 Series and Type 4600 Series Seals: Designed for sealing a wide range of fluids; used for numerous applications on condensate, cooling water, raw water, ash sluice, fuel oil and many other duties

Elastomer Bellows Seals

Type 1 Elastomer Bellows Fitted Seal: Designed for tight sealing spaces and abnormal shaft-end play, run-out and equipment tolerances; used for centrifugal and positive displacement pumps, mixers, agitators, compressors, blowers, fans and other rotating equipment

Split Seals

Type 3740 Cartridge Seal and Type 37FS Split Seal: Designed for rapid installation and maintenance without disassembling the equipment involved; used for small centrifugal pumps, split case pumps, vertical lift pumps, side-entry mixers and agitators with severe shaft run-out

Slurry Seals

Type 5860, Type 5870 and Type 5840 Slurry Seals: Designed for handling slurries with solids contents up to 60% by weight, without the need for water flush support; used for FGD slurry pumps, sludge pumps and coal slurry transportation.

Filtration Systems

Liquid Filtration: Filters designed for almost any liquid application, from lubrication, hydraulic or bearing oil systems to water injection systems.

Seal Gas Filtration: Removes liquid and particle contamination to allow continuous supply of clean, dry gas

Fuel Gas Filtration: Individually tailored for maximum reliability, regardless of the condition of the supply gas

Fuel Oil Filtration: Patented elements that remove water and particle contamination for maximum reliability

Double 3-way and 6-way Transfer Valves: Provides continuous operation while one side receives maintenance

Filter Elements: Patented design for maximum performance and running time between change outs

Process FiltrationJohn Crane’s Seebach filtration products help to ensure smooth process operation in power generation applications.  Filters remove particles and water droplets from gaseous and liquid fuels, and from combustion air, before they enter the combustion chamber. Thus gas turbines are protected from abrasive or baked-on particles.

Power Transmission Couplings

H Series: Designed for high performance, reduced moment and low windage; used for gas turbine drives, high-speed steam turbine drives and critical boiler feed pumps

M Series: Designed to provide a good level of angular, lateral and axial misalignment while maintaining a high level of balance integrity; used for electric motor or turbine drives in the oil and gas industry

ZMH Series: Designed for misalignment tolerance and corrosion resistance; used for long DBSE applications such as forced-draft cooling towers

L Series: Designed to provide a general-purpose, cost-effective solution for demanding industrial applications; used for critical circulator pumps, cooling water pumps, fans and blowers

A Series: Designed for simple coupling replacement without moving either the prime mover or the driven equipment; used for low-duty mechanical drives, conveyors, small pumps and dosing pumps

TSKS/TSCS: Designed to give the most flexible solution for high-torque and misalignment conditions. Ideally suited to meet the pumping, motor, and turbine drive power transmission needs of the power generation industries.


Style 1625G: High-temperature graphite braided packings that offer dimensional stability, reduced process contamination and ease of use

Styles G57, G58 and G58I: High-purity, high-strength interlace braided flexible graphite packings designed to handle a wide range of fluids

100AL: Strong, compressible metallic packing that demonstrates remarkably good shaft conformability and low friction characteristics

Style 1335: Cost-effective, general-service packing constructed of the highest-quality synthetic fibers and lubricants

Style 1340: Cost-effective, general-service graphited packing designed to handle a wide range of fluids at moderate to high temperatures, pressures and shaft speeds

Seal Support Systems

WCH/WCV/K2S: Water-cooled heat exchangers for use where water is readily available

GR1/1C: General-duty reservoir that can withstand pressure up to 16.3 bar while providing buffer/barrier fluid to a dual-seal arrangement

GR2/2C: General-duty reservoir that can withstand pressure up to 30 bar while providing buffer/barrier fluid to a dual-seal arrangement

GR3/3C: General-duty reservoir that can withstand pressure up to 73 bar (stainless steel) or 62 bar (carbon steel) while providing buffer/barrier fluid to a dual-seal arrangement

GP-S/GP-D: Non-API gas control panel for filtering, regulating and monitoring gas supply to gas-lubricated pump seals

Cyclone Separators: Typically used in an API Plan 31 arrangement and incorporated in the seal flush line (API Plan 11 ) from the discharge of the pump

Safeunit Ultima: Specially designed to control seal water flow and pressure in extreme conditions

Safeclean: Removes impurities and particles, providing clean seal water for stuffing boxes and mechanical seals

Power Generation Services

In addition to our highly engineered products, John Crane also provides a wide range of services designed to optimize overall operations. After assessing existing applications and components, we’ve successfully improved centrifugal compressor efficiency by upgrading mechanical seals to dry gas seals, retrofitting aluminum labyrinths with thermoplastic seals and upgrading bearing designs. Here are some other ways we can help:

Equipment Service

John Crane Equipment Service assists with critical systems checks and plant equipment maintenance as well as repair, removal and reinstallation services.

Reliability Support

John Crane Reliability Support services assess equipment reliability and performance, analyze root cause failures and recommend strategies for improvement.

Asset Management

John Crane Asset Management software offers customers a holistic view of their current systems to help spot unleveraged opportunities.


John Crane provides a wide range of training courses that cover the correct procedures for installing, operating and maintaining equipment components.