Low Pressure Turbine Bypass Valve NBSE™

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Good atomization at wide range of flow rates

Small-Drilled-Hole Cage technology uses frequency shifting to maximize noise attenuation

The Rugged, Compact Steam Conditioning Solution

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

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 534-

8-3.

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.

For over 30 years the NBSE™ from Sulzer Valves provides high reliability and accurate control in one steam conditioning valve.

Water-injection nozzle provides smallest water droplet size possible

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Highly reliable, fast, accurate pneumatic and hydraulic actuators provide superior system control.

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.

The CCI NBSE™ Turbine Bypass Valve 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.

Table 1: Factors Influencing Actuator Selection

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noituloseR %1nahTsseL,dooG %1.0nahTsseL,dooGyreV

tsurhT rodecnalaBrofstnemeriuqeRtsurhTsteeMsevlaVtaeSdezirusserP

decnalabnUrofstnemeriuqeRtsurhTsteeMsevlaV

ytilibaileR tsuboRdnaelbaileRyreV tsuboRdnaelbaileRyreV

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stnenopmoC seirosseccAelbaileR,erusserPwoL seirosseccAnevorP,erusserPhgiH

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Optimized Body Shape For Minimal Thermal Stress

Designed for cyclic operation and frequent start-ups.

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.

Top Entry Design

Minimizes service time.

Spraywater Manifold System

Multiple attemperation injection points with single water supply source connection.

Trim H

Valve Performance Characteristics (% Cv vs. % Stroke)Valves can be characterized to accommodate a wide range of variables.

Trim S

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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.

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Table 2: Dimensional Information

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.

125.9 (3200)

130.3 (3310)

138.3 (3515)

150.7 (3830)

165.1 (4195)

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053 "61-"21 "82-"81 17.7 (450) 29.5 (750) 88.5 (2250) 104.3 (2650)

004 "81-"41 "03-"02 )064(1.81 )068(9.33 71.2 (1810) 108.6 (2760)

005 "22-"81 "43-"42 21.6 (550) )0301(6.04 100.9 (2565) 116.7 (2965)

006 "62-"22 "24-"23 )066(0.62 )0121(6.74 113.3 (2880) 129.1 (3280)

007 "03-"62 "44-"43 )067(9.92 58.6 (1490) 127.7 (3245) 143.5 (3645)

C**

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1

6

2

5

3

8

4

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Technical specifications and materials.

Table 3: Capacity and Performance Data

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.

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)vC(Trim S Max Capacity 1416 1873 2762 4117 5758

vTrim S K 1224 1618 2386 3556 4973

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)vC( 1114 1503 2179 3317 4665

962 1298 1883 2866 4031

Trim H Max Capacity

vTrim H K

Table 5: Recommended Desuperheating Lengths Using Spring-Loaded Nozzles

* 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.

Table 4: Materials

1. Alternate materials available per customer’s specific design requirements.

2. For hydraulic actuator, plug/stem material is X19CrMoVNbN111.

DRAG is a registered trademark of CCI.©2002 CCI 393 3/02 10M

Contact us at:info@ccivalve.com

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