Low Pressure Turbine Bypass Valve NBSE

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1 Low Pressure Turbine Bypass Valve NBSE

2 2 For over 30 years the NBSE from Sulzer Valves provides high reliability and accurate control in one steam conditioning valve. The Rugged, Compact Steam Conditioning Solution Water-injection nozzle provides smallest water droplet size possible The NBSE Turbine Bypass Valve by CCI is the standard turbine bypass valve for intermediate pressure bypass systems of combined cycle power plants and low pressure bypass systems of subcritical and supercritical steam cycles. The design is based on proven Sulzer Valves technology, the leader in turbine bypass for power plants for many, many years. Featuring an integrated spring-loaded spraywater nozzle desuperheating manifold at the valve outlet, the NBSE minimizes the downstream desuperheating distance making it suitable for bypass-to-condenser applications with short pipe runs. The contoured body shape has been designed to avoid material concentrations and abrupt changes of wall thickness, minimizing thermal stress in the valve. In addition, the NBSE is available as a combined control and safe shutoff valve according to TRD 421. Spring-Loaded Nozzle Desuperheating NBSE desuperheating features integral spring-loaded water injection nozzles that optimize water injection over a wide range of flow rates at low pressures. With a rangeability of up to 50:1, the spring-loaded water injection nozzles vary the water flow area required to achieve the fine water droplet size needed for atomization. The spring-loaded water injection nozzle design provides the smallest water droplet size possible without steam assist. Small-Drilled-Hole Cage Technology Good atomization at wide range of flow rates Small-Drilled-Hole Cage technology uses frequency shifting to maximize noise attenuation The NBSE Turbine Bypass Valve uses Small-Drilled-Hole Cage (SDHC) technology to provide system noise attenuation through frequency shifting. Frequency shifting is a proven method of noise attenuation recognized by ISA in Technical Standard SP75.07 and by the IEC in Technical Standard In frequency shifting, the main flow stream is separated into hundreds of tiny jets. The size of the jets, which are primarily based on hole size, determines the resulting noise frequency the smaller the size of the jet or drilled hole, the higher the frequency which in turn produces a lower dba level. Small-Drilled-Hole Cage technology is well suited for intermediate pressure combined cycle and low pressure drum boiler turbine bypass applications requiring reliability with moderate noise performance. Unlike traditional drilled hole cages, the SDHC trim uses over one thousand small drilled holes spaced apart in a special pattern designed to ensure full jet separation, structural integrity, and noise attenuation. All drilled hole technology is not the same large drilled holes do not shift the frequency high enough, and improper spacing between drilled holes allows the jets to rejoin and form larger jets after exiting the cage. The conical flow diffuser shape limits vibration by increasing the structural strength when compared to cylindrical cages.

3 Highly reliable, fast, accurate pneumatic and hydraulic actuators provide superior system control. 3 Accurate Control and Available TRD 421 Safety Function CCI s long history of developing advanced technology valves and actuation systems for severe service and safety-related applications has led to the development of the most reliable actuation systems available today. CCI has supplied pneumatic and hydraulic actuation systems for over 30 years and has an extensive installed global base. In addition, if equipped with the necessary safety control devices in combination with the CCI hydraulic actuation system, the NBSE can be used as a combined control and safe shutoff valve according to TRD 421. The selection of pneumatic or hydraulic actuation is primarily a function of valve design for the particular application as well as customer preference. A comparison of the factors influencing actuator selection is given in Table 1. Improve Plant Efficiency Eliminate Lost Steam During normal operation, any leakage past a turbine bypass valve means lost revenue. g Steam that does not go through the turbine does not generate electricity or revenue for the plant. g Money spent generating the steam is lost. g Steam leaking past a valve seat could erode the seat and cause an increase in the leakage rate and maintenance downtime. g Steam leaking past a valve to condenser could reduce the efficiency of the condenser by deteriorating the vacuum and raising the condenser temperature. Table 1: Factors Influencing Actuator Selection Performance Attribute The comes standard with DIN 3230, Rate 3 or ANSI/FCI 70-2 Class V Shutoff, providing dependable, repeatable, shutoff for long periods of time with high pressure differentials. DIN 3230, Rate 1 or MSS-SP-61 Shutoff is standard with hydraulic actuation. CCI Pneumatic Actuator S troke Speed Fast, Less Than 1 Second (optional) CCI Hydraulic Actuator Very Fast, Less Than 0.5 Seconds R esolution G ood, Less Than 1% Very Good, Less Than 0.1% Thrust Reliability Procurement Cost Installation Cost Maintenance Components Meets Thrust Requirements for Balanced or Pressurized Seat Valves Very Reliable and Robust Inexpensive Inexpensive Easy, With Medium Skills Low Pressure, Reliable Accessories Meets Thrust Requirements Valves Very Reliable and Robust Higher Cost Higher Cost for Unbalanced Requires Higher Skills for Maintenance High Pressure, Proven Accessories

4 4 Optimized Body Shape For Minimal Thermal Stress Designed for cyclic operation and frequent start-ups. Top Entry Design Minimizes service time. No trim parts are welded or screwed into the valve body Small Drilled-Hole-Cage Technology Ensures low noise levels. Spring-Loaded Spraywater Nozzle Desuperheaters Provides superior atomization. Mounted directly to outlet eliminating need for additional piping sections. Spraywater Manifold System Multiple attemperation injection points with single water supply source connection. Valve Performance Characteristics (% C v vs. % Stroke) Valves can be characterized to accommodate a wide range of variables. Trim H Trim S

5 5 Use this checklist to evaluate the benefits of the NBSE design. 1. Special needs can be accommodated. Please consult with the factory. 2. Flexible tubing is standard for the spraywater manifold system. Rigid piping manifold option is available. 3. Dump tubes available if required.

6 6 Table 2: Dimensional Information Valve Size Inlet Pipe Size (inch) Outlet Pipe Size (inch) 1. All dimensions are in inches except () are in millimeters. 2. Dimension C is for a hydraulic actuator, C* is for a pneumatic actuator and C** is for a pneumatic actuator including an optional handwheel on top. 3. Buttweld per ANSI B16.25 and mating pipe schedule. 4. Valve may be installed in any orientation. The upper structure does not require additional support. 5. Flexible tubing is supplied to a single connection manifold. A B C C* " - 16" 18" - 28" 17.7 (450) 29.5 (750) 88.5 (2250) (2650) " - 18" 20" - 30" 18.1 (460) 33.9 (860) 71.2 (1810) (2760) " - 22" 24" - 34" 21.6 (550) 40.6 (1030) (2565) (2965) " - 26" 32" - 42" 26.0 (660) 47.6 (1210 ) (2880) (3280) " - 30" 34" - 44" 29.9 (760) 58.6 (1490) (3245) (3645) C** (3200) (3310) (3515) (3830) (4195)

7 Technical specifications and materials. 7 6 Table 3: Capacity and Performance Data Valve size Trim S Max Capacity (Cv) Trim S Kv Trim H Max Capacity ( Cv) Trim H Kv Valve Characterization (%Cv vs. %Opening) Linear (standard) 1 Rangeability Up to 50: 1 3 Shutoff Class Pneumatic: DIN 3230, Rate 3 (ANSI/FCI Class V) as Standard Hydraulic: DIN 3230, Rate 1 (MSS-SP-61) as Standard 7 3 Actuator Type Double-Acting Pneumatic Piston or Hydraulic 4 8 Fail Mode Stroke Time Open or Closed as Required Fail in Place with Hydraulic Actuator < 2 Seconds Standard, Optional < 1 Second 2 Valve Inlet Temperature Rating Up to 600C (1110 F) Table 4: Materials 2 Valve Inlet Pressure Rating Up to 70 Bar (1015 Psig) 1. Rangeability may vary with process conditions. Consult with factory. 2. For exact pressure/temperature rating, consult factory. 3. Electro mechanical actuator available on request. Table 5: Recommended Desuperheating Lengths Using Spring-Loaded Nozzles 1. Alternate materials available per customer s specific design requirements. 2. For hydraulic actuator, plug/stem material is X19CrMoVNbN111. * With saturated steam, to avoid pipe erosion and liquid drop-out due to droplet impingement, bends should be avoided. **Saturated steam conditions cannot be controlled through downstream temperature measurement. Feed-forward/enthalpy control recommended. + All dimensions are in feet except () are in millimeters.

8 Throughout the world, companies rely on CCI to solve their severe service control valve problems. CCI has provided custom solutions for these and other industry applications for more than 40 years. Sales and service locations worldwide. CCI World Headquarters California Telephone: (949) Fax: (949) Avenida Empresa Rancho Santa Margarita, California USA CCI Switzerland formerly Sulzer Thermtec Telephone: Fax: Hegifeldstrasse 10, P.O. Box 65 CH-8408 Winterthur Switzerland CCI Korea Telephone: Fax: , Pungmu-Dong Kimpo City, Kyunggi-Do South Korea CCI Japan Telephone: Fax: , Shukunosho Ibaraki-City, Osaka Japan CCI Sweden (BTG Valves) Telephone: Fax: Box 603 SE Säffle Sweden CCI Austria formerly Spectris Components GmbH Telephone: Fax: Carlbergergasse 38/Pf Vienna Austria Contact us at: Visit us online at: DRAG is a registered trademark of CCI CCI 393 3/02 10M

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