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Bringing energy and the environment into harmony.


dry gas seals

and the ongoing the most experienced gas seal (procurement. chemical plants.000 rpm.DRY gas seals No one is better qualified to ■ improve efficiency— sometimes dramatically—by eliminating the parasitic power losses caused by oil shear and drag designs. even with the ever since in various compressor auxiliaries deactivated. and speeds of success up to 48. dates back to the 1970s when tandem. pressures (up to 2. as well as Our dry gas seal experience various arrangements (single. advanced designs.” That makes D-R one of using the resources systems. In 1982. the technology in natural gas application. gas Upgrading the gas seals liquefaction. more than 1. Thanks to our extensive compressors.900 a track record psi / 200 bar). D-R created lubricants a special patented rotor groove ■ eliminate contamination of pattern and carbon ring pusher seal oil by the process gas design that maximize reliability ■ extend the life of lubricating oil in all operating conditions. etc. Close Dresser-Rand dry gas to 1. Some D-R standards. D-R gas seals are available in hang-up and high-reliability a range of dimensions (2 in / features. The standard materials experience. dry gas seals: optimum performance experience now exceeds 10 and long life ■ eliminate the need for million hours with no “hang- D-R gas seals are manufactured complex and costly seal oil ups. D-R can been delivered or are currently selected to comply with NACE bring these advantages to your in production. accommodate a large range state-of-the-art manufacturing Since 1996. sealing applications such as gas transmission. In 1995. we drew on our extensive experience to develop our own gas seal technology. 617 requirements. 11 years. using advanced engineering methods and tools bring this superior technology ■ eliminate contamination such as CAD systems and finite to your equipment. The total running lubricated seals. of process gas by seal element analysis. refineries. and testing. Both unidirectional dry gas seals are installed on lift compressors. and ability to offer Dresser-Rand gas seals have materials can be specially full-service solutions. This ■ retain pressure during design has been proving itself shutdown. world. operation benefit from our product’s unique anti.) with them of our ISO 9000-certified MAKING A GOOD manufacturing and quality IDEA EVEN BETTER organizations. 50. and bidirectional designs D-R cartridge-type dry 95% of new compressors for Ingersoll-Rand began using are available for your needs gas seals comply with API varied services throughout the gas seals in process gas and process requirements. double).000 D-R gas seals are seals can help your currently in operation. To ensure Not content with existing product performance and . gas seals have been running continuously for more than built and tested for Compared to conventional oil. to provide Ingersoll-Rand began applying the best solution for each Because of their advantages. When required.8 mm to 13. maintenance associated manufacturers in the industry. existing centrifugal compressor.9 mm). quality inspection. manufacturing.5 in / 342. on your centrifugal and gas production—both compressors to onshore and offshore.600 of conditions.

engineering process gas to be contained. required Spring: Inconel physical characteristics and Barrier Seal: Carbon Ring fit for existing cavities. . allow reverse rotation. After reassembly. support. from initial consultation through final testing. The seals are then disassembled and inspected. creating a very small gap. inspection. filtered compressor discharge provide experienced project gas. The inner portion upgrades. O Ring: Aflas performance and reliability are Stationary Seat: Carbon all carefully considered. is introduced into the seal has additionally been designed to capabilities and direct technical area. a static test is Designed for reliability performed. is held against a rotating rotating seal face provides excellent Dresser-Rand is your single- ring. D-R’s patented innovations ensure consistent performance. reduced to a pressure slightly above that of the D-R's bidirectional patented pattern management. D-R’s Rotating Seat: experts in rotor dynamics.client satisfaction. A solutions of short and long grooves on the stationary ring. as requested. custom. case-by-case basis. fixed to the case. of the faces creates a “dam” region where the gas pressure is broken down to the flare or the vent pressure. pushes the spring-loaded stationary ring away from the up supervision for all seal rotating ring. gas seal upgrades. fixed to the shaft by springs and pressure. thermodynamics. the grooves on the rotating ring compressor modifications. As the shaft rotates. including compression service. Gas Path pressure and flow rate at each seal connection are measured and recorded with calibrated instruments over the full range outboard of rated operating speeds and pressures. We handle total procurement. performance. We the outer portion. Safety. Typically. Centrifugal compressor seals are a critical subsystem that must be carefully integrated into the overall unit design. Tungsten Carbide (Shrouded) or Silicon Carbide aerodynamics. create a dynamic gas pumping or “lifting” effect that installation. The temperature. full-service D-R's unidirectional patented pattern At the heart of every gas seal is a pair of rings. a dedicated D-R Gas Seals Business Unit manages the complete inboard production process. Rotating Seat Every D-R gas seal is subjected to a complete set of tests. and start. The fully equipped test rig includes Stationary Ring a test vehicle in which a pair of gas seals (CW = Clockwise and CCW = Counter Clockwise) Compressor is tested under contractual Shaft conditions. We take into account the crucial aspects Metallic Components 410 (NACE Compliant) of each application. The acting lift-off effect and optimum gas film source solution for dry face of the rotating ring incorporates special grooves on stiffness at both low and high speeds. and seal systems Other Material Options: design/technology work closely O-Rings—Silicone or Polymer Seal together to optimize each Barrier Seal—Aluminum Labyrinth system and ensure an efficient Other materials available on a upgrade with minimal downtime.

” The reliability of the seal depends upon its ability to accommodate sudden disturbances Improved Design with (vibrations. unidirectional groove patterns provide O-RINGS of the carbon ring is in a three to five times greater gas film stiffness than relatively high-temperature bidirectional patterns.) without contact between the faces. so there is less risk of a high-friction seal. etc. “Hang-Up” INTERNAL DIA.” resulting in too wide a gap film reduces the risk of contact between the faces. In the absence of pressure. When the seal is rotating. This provides the advantages A bidirectional seal is the same at both ends of the mentioned above plus compressor (to prevent incorrect assembly). However. design and installation of process condition and “hang-up. to an externally imposed variation of the gap. bidirectional groove patterns. low pressure. Reverse rotation can still occur in abnormal situations or in some specific processes (closed Dresser-Rand L-Ring loop systems) and only bidirectional seals can Design: Lowest Risk of withstand reverse rotation at maximum pressure and “Hang-Up” maximum speed. or “hang up. shocks due to process L-Shaped Pushing Ring: upsets. The resulting increase in the closing force is than one seal on hand in inventory to minimize generally sufficient to eliminate “hang-up. between the rings and the potential for process gas leakage. If O-ring friction prevents the spring from functioning. sliding face of the O-ring is transferred to the bottom of the however. only the spring force closes the seal. environment. in the cartridge. Both the and most obvious advantage is its cartridge and L-ring are manufactured of steel (same thermal ability to operate in either direction expansion coefficient and Young’s modulus). while keeping the OD Seal Design: A Risk of leakage rate at an acceptable level. Having an important benefit: if the O-ring sticks to the housing. . Dresser-Rand recommends keeping more O-ring groove. Reverse rotation can between the L-ring and cartridge does not change significantly Bidirectional often be avoided by the proper with operating conditions. O-ring. the seal can remain open (due to dirt. For The first seal at the back a given gap. In operating mode ID the closing forces (springs BD plus pressure between ■ U  nidirectional seal groove outer diameter and balance patterns are known to provide diameter equalize the greater gas film thickness opening forces (pressure gradient between outer diameter and and higher gas film stiffness.” equipment (for instance. gas film thickness also increases the leakage rate. OF This design uses a single Both unidirectional and bidirectional designs have GROOVES their own advantages. thereby increasing reliability. inner diameter in clearance gap)). for instance). check valve position). increasing D-R’s patented design solves this problem. The radial clearance of rotation. Unidirectional thus better reliability than seal. the gas film thickness preventing the springs to push the stationary ring toward defines the distance between the faces. A thicker gas the rotating ring. the the same seal at both ends makes it interchangeable. It must be noted that unidirectional Our patented design seals have some significant ability to withstand places the second O-ring reverse rotation for a short period of time and at low in the L-ring instead of speed. surge. a condition known as “hang-up. Which design should low risk of “hang-ups” you choose? As elegant as the gas seal solution is. High Less Risk of “Hang-Up” gas film stiffness enables the seal to better react This design uses two O-rings.” operational risk. in actual applications it can develop a flaw: friction can cause the o-ring to stick. The second O-ring is fitted into the bore ■ The bidirectional gas seal’s first of the seal cartridge in a lower-temperature location. A good design will have sufficient film thickness to Standard Dry Gas provide the best possible reliability.

Dynamic testing. set of seals to ensure a quick change-out with minimal down time. The gas seal repair and test facilities at the Dresser-Rand Service Centers in Houston. Le Havre. Indonesia gas seal repair and static test facility. Campinas. Brazil gas seal repair and static test facility.TEST facilities Complete gas seal maintenance and testing available in the U. Texas. The restored seals will be repackaged as an assembly and returned in their original shipping container. . Cilegon. France.. Seals removed from service for any reason should be returned to the nearest service center for disassembly. ready for the next change-out. France gas seal Indonesia stand ready to service D-R gas seals repair and test facility. Brazil and Cilegon. Static testing is always performed on refur- bished seals. with authorized factory parts and testing to restore them to their original condition. simulating running conditions of pressure and speed. clean-up and test- ing. Le Havre. Texas gas seal We recommend that each installation has a spare repair and test facility.S. Campinas. Indonesia. and Brazil. Houston. is performed when major parts are replaced. France.

dresser-rand. Middle East & Africa) Fax: (Int'l +60) 3-2093-2622 Cedex 16 Dresser-Rand S.® . Printed in U. Avenue Kleber (Europe. Contact Dresser-Rand for detailed design and engineering information suitable to your specific applications.S. Malaysia Dresser-Rand EMEA Tel: (Int'l +60) 3-2093-6633 112.A. France USA Brazil. Texas 77042 Bangunan Malaysian Re Tel: (Int'l +1) 713-354-6100 Tel: (Int’l +1) 713-354-6100 17 Lorong Dungun Fax: (Int'l +1) 713-354-6110 Fax: (Int’l +1) 713-354-6110 Damansara Heights 50490 Kuala Lumpur. 13458-626 Tel: (Int'l +33) 2-35-25-5225 Tel: (Int'l +1) 713-346-2257 Tel: (Int'l +55) 19 3728. Suite 1000 West8 or contact us at: Dresser-Rand S. Paris 75784 France 31 Boulevard Winston Churchill Tel: (Int’l +33) 156 26 71 71 Cedex 7013 Fax: (Int’l +33) 156 26 71 72 Le Havre or contact the following: CORPORATE Headquarters Regional Headquarters Dresser-Rand The Americas Asia-Pacific West8 Tower. 9th Floor Houston. Dresser-Rand reserves the right to modify its products and related product information at any time without prior notice. France Tel: (Int'l +33) 2-35-25-5225 Email: info@dresser-rand. This brochure comprises a general overview of the Dresser-Rand products described herein. Lázaro Gonçalves de Oliveira.A. It is solely for informational purposes. 2100 Cedex 7013 Houston.8600 – Services Fax: (Int'l +33) 2-35-25-5366/5367 Fax: (Int'l +1) 713-827-0353 Tel: (Int'l +55) 19 3459.dresser-rand. Form 85189-14 Bringing energy and the environment into harmony. DRESSER-RAND is a registered trademark of Dresser-Rand Company. visit www.A. For more information on dry gas seals. Dresser-Rand Dresser-Rand do Brasil 31 Boulevard Winston Churchill 1415 Lumpkin Road Av. TX 77043 Santa Barbara d’Oeste Le Havre 76080. Suite 1000 Dresser-Rand Asia Pacific Sdn Bhd 10205 Westheimer Road 10205 Westheimer Road Unit 9-4. Texas 77042 Houston.4200 – Operations For a complete list of products and Fax: (Int'l +33) 2-35-25-5366/5367 ©2014 Dresser-Rand. and is not to be construed as an offer to sell or solicitation to buy. visit www. does not represent a warranty or guarantee of the information contained herein.