IP/LP™Turbine Bypass Valve for Intermediate Pressure and Low Pressure Bypass Applications

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IP/LP™ delivers superior pressure reduction and temperature control, low noise and vibration, and fast response in a compact high capacity steam conditioning control valve.

The Low Noise Compact Steam Conditioning Solution

The IP/LP™ by CCI is the leading intermediate pressure turbine bypass valve

for combined cycle plants and low pressure turbine bypass valve for drum

boilers and process steam plants. The high capacity design offers a low noise

level in the smallest package possible and easily fits into most existing piping

arrangements. The IP/LP™ may be installed in any orientation without the

need for additional support for the upper structure. Featuring an integrated

spring-loaded spraywater nozzle desuperheating manifold at the valve outlet,

the IP/LP™ minimizes the downstream desuperheating distance making it

extremely compact for all types of intermediate pressure steam conditioning

applications including bypass-to-condenser with short pipe runs. In addition,

the IP/LP™ has a special thermally compensated design that adapts to the

high temperature gradients present in intermediate to low pressure turbine

bypass applications.

Spring-Loaded Nozzle Desuperheating

IP/LP™ 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 as 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 IP/LP™ 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, determine

the resulting noise frequency—the smaller the size of the jet or drilled hole,

the higher the frequency, which in turn produces a lower transmitted dBA

level. Small-Drilled-Hole Cage technology is ideally suited for intermediate

pressure combined cycle and low pressure drum boiler turbine bypass

applications.

Unlike traditional drilled hole cages on the market today, 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 maximum

noise attenuation. All drilled hole technology is not the same—large drilled

holes do not shift the frequency high enough; improper spacing between

small drilled holes allows the jets to rejoin and form larger jets after exiting

the cage; and improper structural cage design could have disastrous effects.

Water-injection nozzle provides smallest water droplet size possible

Good atomization at wide range of flow rates

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

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

Accurate Control

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 40 years and has

an extensive installed global base. Our pneumatic actuation systems can deliver

stroke speeds of less than one second while maintaining accurate resolution

and control.

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.

Steam that does not go through the turbine does not generate electricity or

revenue for the plant.

Money spent generating the steam is lost.

Steam leaking past a valve seat could erode the seat and cause an increase in

the leakage rate and maintenance downtime.

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 IP/LP™ Turbine Bypass Valve comes standard with ANSI/FCI 70-2

Class V Shutoff, providing dependable, repeatable, shutoff for critical turbine

bypass applications requiring exceptional seat tightness for long periods of

time with high pressure differentials.

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Table 1: Factors Influencing Actuator Selection

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Top Entry Design

Minimizes service time.

Small-Drilled-Hole Cage Technology

Ensures low noise levels

Spring-Loaded Spraywater Nozzle Desuperheaters

Mounted directly to outlet, eliminating need for additional piping sections.

Superior Atomization

Spraywater Manifold System

Multiple attemperation injection points with single water supply source connection.

Full Thermal Compensation Design

Resistant to thermal shock.

Metal-to-Metal Seat

Provides Class V Shutoff.

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

Linear Modified Equal Percentage Equal Percentage

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No trim parts are welded or screwed into the valve body

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Use this checklist to evaluate the benefits of the IP/LP™ Design.

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1. All dimensions are in inches, except ( ) are in millimeters.2. Per customer design requirements.3. Dimension A is from valve centerline to outlet without spray nozzles. 4. Dimension A* is from valve centerline to outlet with spray nozzles.5. Dimension D is for a pneumatic actuator without manual override.6. Dimension D* is for a pneumatic actuator with manual override.7. Dimension D** is for a hydraulic actuator.8. Buttweld per ANSI B16.25 and mating pipe schedule.9. Valve may be installed in any orientation without additional support for the upper structure.

Table 2: Dimensional Information

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A custom solution based on 40 years of experience.

IP/LP™ Outline

Dimensions

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Technical specifications and materials.

1. Rangeability may vary with process conditions. Consult with factory.2. Valve may be installed in any orientation. The upper structure does not

require additional support. 3. Hydraulic actuator available upon request.4. Design pressure and temperature shown is for A217-C12A body material.

* 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 meters.

Table 3: Materials

Table 4: Capacity and Performance Data

Table 5: Recommended Desuperheating Lengths Using Spring-Loaded

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

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DRAG is a registered trademark of CCI.©2002 CCI 386 3/02 3M

Contact us at:info@ccivalve.com

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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.

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