CCI Choke Valve

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DRAG® Technology for Severe Service Choke Valves

Today’s gas field environment means higher wellhead pressures with

aggressive fluids and entrained sand and other solids. A conventional single

stage choke valve is not suitable for this kind of severe service. The need to

maintain production rates means that frequent choke repair or replacement

is no longer acceptable. CCI has responded to this need by developing the

world’s first true severe service choke valve.

CCI has been solving severe service control valve problems in the oil and gas

industry for over 30 years. The CCI severe service choke uses a combination

of proven DRAG® velocity control technology and the best grades of

tungsten carbide material used in the industry to provide long trim life and

precise process control.

Velocity Control

Fluid velocity is the predominant factor in erosion. Erosion rates will vary as

a third-to-fifth power function of velocity (V3 to V5). Example: erosion will

be reduced by a factor of between 8 and 32 if the velocity can be reduced by

a factor of two.

The DRAG® Valve Concept

CCI’s DRAG® disk stack controls flowing velocities throughout valve trim

by forcing the process fluid to follow a tortuous path of right angle turns.

The resistance to flow provided by these turns (or stages) limits the trim exit

velocity to a safe level, regardless of the pressure drop. The DRAG® choke

valve eliminates problems resulting from excessive fluid velocities such

as trim and body erosion, noise, vibration and poor process control. The

fluid velocities within the trim of CCI choke are typically 1/3 to 1/4 that of

conventional single stage chokes. Velocity control protects the trim from

erosion and increases the trim life many fold.

CCI has spent several years developing the manufacturing and design

technology to make solid tungsten carbide DRAG® disk stacks. Thereby

making all stages from the much harder, erosion resistant tungsten carbide

material.

Severe service DRAG® choke valve delivers precise wellhead pressure control with superior life.

Figure 1: Cutaway of Choke Disks Showing Flow Path

Figure 2: Tungsten Carbide Disk Stack

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Figure 3: Choke Internals

Stem

Disk Stack

Seat

Materials

CCI chokes utilize solid tungsten carbide trim. The plug is solid tungsten

carbide, not just carbide tipped. The disk stack provides for multi-stage

letdown and is made from solid tungsten carbide, an industry first. The seat

ring is provided with a tungsten carbide venturi, allowing for a controlled,

erosion resistant expansion into the choke outlet and downstream piping.

The CCI severe service choke is an engineered solution to the world’s most

difficult choke applications. CCI severe service chokes will make your

operation more profitable by dramatically reducing maintenance cost and

eliminating lost production due to unscheduled shutdowns caused by failure

of conventional chokes.

Flexibility

In most cases, CCI can provide with the replacement higher capacity DRAG®

disk stack to accommodate the future depleted well conditions to allow for

increased flow rate at lower pressure drops while keeping the same choke

valve body and other components. For extreme cases where a larger trim is

required, CCI can provide with the replacement trim consisting of disk stack

(or PPC trim, drilled hole or ported cage), plug and the seat while keeping

the valve body and other components unchanged (see Figure 4).

CCI can provide retrofit trim for many other manufacturers’ chokes or

complete replacement chokes to fit existing piping configuration in case

retrofit is not a feasible solution.

Plug

3

Figure 4: Trim Designs

Severe Service Trim:Solid tungsten carbide multi-stage DRAG® trim

PPC (Premium Production Choke) Trim:Combined severe service DRAG® and ported cage trim

Ported Cage Trim:High capacity solid tungsten carbide trim

Highly flexible configuration allows for future depleted well conditions.

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Bolted Bonnet

Easy Maintenance

Pressure Balancing Seals

Reduces actuator/handwheel force

Provided with dual scrapers to keep solids out of sealing areas

Solid Tungsten Carbide Venturi Seat

Tungsten carbide venturi seat in high turbulence zones

Venturi seat transition flows smoothly into valve outlet and piping

Optional Stellite Insert

Extra erosion resistance

Solid Tungsten Carbide Plug

Solid tungsten carbide eliminates galling

Excellent erosion resistance

Large balance holes will not clog

Solid Tungsten Carbide Disk Stack

Solid tungsten carbide for erosion resistance

Multi-step letdown to control velocity, erosion and noise

Large flow passages, easily handle solids and dirty fluids

4

CC

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alveUse this checklist to evaluate the benefits of the CCI severe service choke valve.

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5

CC

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veTechnical specifications and materials.

Table 1: Materials

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Table 2: Performance Data

1. TRIM 100D DRAG®: Solid tungsten carbide multi-stage disk stack PPC: Solid tungsten carbide lower 1/3 of disk stack is DRAG® trim. Remainder of stack is cage design. Cage: Solid tungsten carbide drilled hole or ported cage design.

2. Lower or higher temperature available with special design to meet API Class ‘L’ and ‘X’

2

6

1

5

3

4

7

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Table 3: Product Range and Capacity

1. The rated Cv for the severe service chokes will vary based on the process requirements

2. End connections are provided in ANSI and API

3. Consult factory

Figure 6: Statoil Choke Valve with Stepper Actuator

Figure 5: Jade Choke Valve with Electric Actuator for Unmanned Oil Platform

CCI World Headquarters—CaliforniaTelephone: (949) 858-1877Fax: (949) 858-187822591 Avenida EmpresaRancho Santa Margarita,California 92688 USA

CCI Switzerland formerly Sulzer ThermtecTelephone: 41 52 262 11 66Fax: 41 52 262 01 65Hegifeldstrasse 10, P.O. Box 65CH-8408 WinterthurSwitzerland

CCI KoreaTelephone: 82 31 985 9430Fax: 82 31 985 055226-17, Pungmu-DongKimpo City, Kyunggi-Do 415-070South Korea

DRAG is a registered trademark of CCI.©2002 CCI 275 5/02 10K

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.

Contact us at:info@ccivalve.com

Visit us online at:www.ccivalve.com

CCI JapanTelephone: 81 726 41 7197Fax: 81 726 41 7198194-2, ShukunoshoIbaraki-City, Osaka 567-0051Japan

CCI Sweden (BTG Valves)Telephone: 46 533 689 600Fax: 46 533 689 601Box 603SE-661 29 SäffleSweden

CCI Austriaformerly Spectris Components GmbHTelephone: 43 1 869 27 40 Fax: 43 1 865 36 03Carlbergergasse 38/Pf.191233 ViennaAustria

CCI ItalyTelephone: 39 035 29289 Fax: 39 035 2928246Via G. Pascoli 10 A-B24020 Gorle, BergamoItaly

Sales and service locations worldwide.