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N-Seal
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Nuclear Primary Pump Seal Upgrade

Supplier of Choice to the Nuclear Power Industry Since the late 1940’s, Flowserve has been a pioneer of pump and seal technology for the nuclear power industry. With many “firsts” to its credit over the decades, Flowserve has advanced pump and seal performance, safety and reliability for Nuclear Steam Supply System applications. Flowserve equipment is installed in more than 200 nuclear power plants worldwide. More than 300 Flowserve reactor primary pumps are providing utmost service reliability. Flowserve has more than 5000 pumps installed in nuclear power plants around the world and offers...

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N-Seal Nuclear Primary Pump Seal Upgrade Proven Performance Nuclear plant operators must have confidence that their primary pump seals are able to safely and reliably endure the full range of plant operating transients, including extreme pressures and temperatures. With the Flowserve N-Seal, there is no doubt. The result of years of research, thousands of hours of rigorous testing and decades of primary pump application experience, the Flowserve N-Seal represents the nuclear industry’s most advanced mechanical seal technology. Since 1988, it has provided proven service and fail-safe...

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N-Seal Nuclear Primary Pump Seal Upgrade Features and Benefits Cartridge Construction simplifies installation and keeps associated costs low. It also enables more accurate seal setting and facilitates testing of the complete seal prior to installation. Redundant Seal Design consists of two, three or four stages, depending on the reactor type. Each stage is capable of handling 100% of the system pressure. During normal operation, system pressure is distributed equally among the stages. In the event of stage failure, pressure is automatically redistributed among the remaining stages, allowing...

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Mayer Groove Slotted Carbon Precision Face Topography Safety Through Redundancy Hydrodynamic Sealing Technology Each of the stages of the N-Seal is designed to handle 100% of the system pressure. Having multiple stages creates a safety margin through redundancy. During normal operation, system pressure is equally distributed among the stages, reducing wear on each individual stage. All stages of the N-Seal employ hydrodynamic sealing technology (see images above), which offers major advantages over hydrostatic designs: More importantly, though, the N-Seal’s multiple stage design means it...

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Safe Shut-Down Features Abeyance Seal Actuation Sequence Normal operation Full deployment Fail-Safe Operation Since 1986, Flowserve has extensively tested the N-Seal to validate all operating parameters and ensure complete safety. The multi-stage design of the N-Seal provides the redundancy required for safe operation under all plant transient conditions, including station blackout, 10CFR50 Appendix R and National Fire Protection Association (NFPA) 805 loss of seal cooling scenarios. • Performance Testing — Flowserve has repeatedly tested the N-Seal under normal and emergency transient...

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Product Support Continuous Improvement Flowserve continues to develop and improve products and services for installing and maintaining critical nuclear components. Seal Removal Tooling • Designed to enhance safety during seal and coupling removal and replacement (see photo at top, left) • Time savings up to 90% for reduced exposure and cost • Redesigned to reduce overall weight • Quick disconnect for easy installation and removal Test Cart Portable seal test carts allow on-site flow and pressure testing before installation. This dramatically reduces seal leakage risks after installation. •...

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USA and Canada Flowserve Corporation 5215 North O’Connor Blvd. Suite 2300 Irving, Texas 75039-5421 USA Telephone: +1 937 890 5839 Europe, Middle East, Africa Flowserve Corporation Parallelweg 13 4878 AH Etten-Leur The Netherlands Telephone: +31 76 502 8100 Latin America Flowserve Corporation Martín Rodriguez 4460 B1644CGN-Victoria-San Fernando Buenos Aires, Argentina Telephone: +54 11 4006 8700 Telefax: +54 11 4714 1610 Asia Pacific Flowserve Pte. Ltd. 10 Tuas Loop Singapore 637345 Telephone: +65 6771 0600 Telefax: +65 6862 2329 Bulletin PS-80-2b (E) April 2013. © 2013 Flowserve Corporation...

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