ANSI FCI 70-2-2006.pdf - [PDF Document] (2022)

  • ANSI/FCI 70-2-2006

    AMERICAN NATIONAL STANDARD

    CONTROL VALVE SEAT LEAKAGE

    Fluid Controls Institute, Inc. Sponsor:

    Fluid Controls Institute, Inc. 1300 Sumner Ave Cleveland, Ohio44115-2851

  • ii

    ANSI/FCI 70-2-2006 AMERICAN NATIONAL STANDARD Control Valve SeatLeakage Sponsor Fluid Controls Institute, Inc.

  • www.bzfxw.com

    iii

    American National Standard implies a consensus of thosesubstantially concerned with its scope and provisions. An AmericanNational Standard is intended as a guide to aid the manufacturer,the consumer, and the general public. The existence of an AmericanNational Standard does not in any respect preclude anyone, whetherhe has approved the standard or not, from manufacturing, marketing,purchasing or using products, processes, or procedures notconforming to the standard. American National Standards are subjectto periodic review and users are cautioned to obtain the latesteditions.

    CAUTION NOTICE: This American National Standard may be revisedor withdrawn at any time. The procedures of the American NationalStandards Institute require that action be taken to reaffirm,revise, or withdraw this standard no later than five years from thedate of publication. Purchasers of American National Standards mayreceive current information on all standards by calling or writingthe American National Standards Institute.

    Sponsored and published by: FLUID CONTROLS INSTITUTE, INC. 1300Sumner Avenue Cleveland, OH 44115-2851 Phn: 216/241-7333 Fax:216/241-0105 E-Mail: [emailprotected] URL:www.fluidcontrolsinstitute.org Copyright 2006, 1998, 1968 by FluidControls Institute, Inc. All Rights Reserved No part of thispublication may be reproduced in any form, in an electronicretrieval system or otherwise, without the prior written permissionof the publisher. Suggestions for improvement of this standard willbe welcome. They should be sent to the Fluid Controls Institute,Inc. Printed in the United States of America

    American National Standard

  • www.bzfxw.com

    iv

    CONTENTS PAGE Foreword..............................................................................................................................v 1. Purpose..........................................................................................................................1 2. Scope and Limitations...................................................................................................1 3.Definitions......................................................................................................................1 4. Leakage Specifications andClasses...............................................................................1-2 5. Test Procedures..............................................................................................................2-4 6.References......................................................................................................................4 Tables Table 1..................................................................................................................................2 Table 2..................................................................................................................................3

  • www.bzfxw.com

    v

    Foreword (This foreword is included for information only and isnot part of ANSI/FCI 70-2-2006, Control Valve Seat Leakage.) Thisvoluntary standard has been compiled and issued in the publicinterest. It is intended to eliminate present misunderstandings andto assist and guide those people involved in the specification, useor manufacture of control valves. This standard, formerly known asASME B16.104, was originally adopted on November 24, 1970 as FCI70-2. The standard has been revised several times through the yearsto stay current as the industry and its products have evolved andadvanced. The standard was revised by the FCI Control Valve Sectionin 1998 in order to maintain consistency with the appropriate IECStandards (IEC 534-4). The standard was revised in 2003 to add theoption to permit low pressure gas testing to determine Class Vleakage. During the canvass of the 2003 version, one respondentasked for the standard to be modified to specifically excludeon/off valves used for tight shut-off. The FCI Control Valve andRegulator Section notes that FCI 70-2 has been intended to apply tocontrol valve seat leakage. If line isolation and/or absolute tightshut-off is a normal expectation of the valve application, the FCIControl Valve and Regulator Sections recommend specifying anotherstandard, such as API 598, Valve Test and Inspection. The existenceof a Fluid Controls Institute (FCI) standard does not in anyrespect preclude any member or non-member from manufacturing orselling products not conforming to this standard nor is the FCIresponsible for its use. FCI recognizes the need to periodicallyreview and update this standard. Suggestions for improvement shouldbe forwarded to the Fluid Controls Institute, Inc., 1300 SumnerAvenue, Cleveland, Ohio, 44115-2851. All constructive suggestionsfor expansion and revision of this standard are welcome.

  • www.bzfxw.com

    1

    ANSI/FCI 70-2-2006

    AMERICAN NATIONAL STANDARD

    Control Valve Seat Leakage

    1. PURPOSE 1.1 This standard establishes a series of seatleakage classes for control valves and defines the test procedures.2. SCOPE & LIMITATIONS 2.1 Selection of a leakage class is notrestricted as to valve design, but acceptable values for variouscommercially available designs are suggested for each class underSection 4. 2.2 The standard cannot be used as a basis forpredicting leakage at conditions other than those specified. 2.3This standard is similar to IEC 60534-4, except that no provisionis made for Class IV-S1 and the standard is applicable for valveswith a Cv value less than 0.1. The air leakage test and allowableleak rates for Class V are equivalent to the water test andallowable water leakage rates for a water test performed at anominal temperature of 60F. 3. DEFINITIONS 3.1 Control Valve 3.1.1A valve with a power positioning actuator for moving a closuremember to any position relative to a valve seat or seats inresponse to and in proportion to an external signal. The energy fora control valve actuator is derived from an independent source.3.1.2 Control valve body subassemblies on which an actuator is tobe mounted at some later date are within the intent of thisdefinition. 3.2 Cv - An experimentally determined valve sizingcoefficient. (Ref. ISA S75.01, ISA S75.02 and FCI Standard 84-1).3.3 Rated Valve Capacity. The quantity of test fluid (air or water)that would pass through the valve at rated travel under the statedpressure conditions as determined by the appropriate equations andmanufacturer's ratings.

    3.4 Rated Travel. The valve travel at which the manufacturer'srating is established. 3.5 Seat Leakage. The quantity of test fluidpassing through an assembled valve in the closed position under thetest conditions as defined. 4. LEAKAGE SPECIFICATIONS & CLASSES4.1 The maximum allowable seat leakage as specified for each classshall not exceed the seat leakage in Table 1 using the testprocedure as defined in Section 5. For Classes II through VI eachand every valve shall be tested. 4.2 Leakage Classes 4.2.1 CLASS I.A modification of any Class II, III or IV valve where design intentis the same as the basic class, but by agreement between user andsupplier, no test is required. 4.2.2 CLASS II. This classestablishes the maximum permissible leakage generally associatedwith commercial double-seat control valves or balanced single-seatcontrol valves with a piston ring seal and metal-to-metal seats.Use test procedure Type A. 4.2.3 CLASS III. This class establishesthe maximum permissible leakage generally associated with Class II(4.2.2), but with a higher degree of seat and seal tightness. Usetest procedure Type A. 4.2.4 CLASS IV. This class establishes themaximum permissible leakage generally associated with commercialunbalanced single-seat control valves and balanced single-seatcontrol valves with extra tight piston rings or other sealing meansand metal-to-metal seats. Use test procedure Type A. 4.2.5 CLASS V.This class is usually specified for critical applications where thecontrol valve may be required to be closed, without a blockingvalve, for long periods of time with high differential pressureacross the seating surfaces. It requires special manufacturing,assembly and testing techniques. This class is generally associatedwith metal seat, unbalanced single-seat control valves or balancedsingle-seat designs with exceptional seat

  • www.bzfxw.com

    2

    TABLE 1

    Leakage Class Maximum Seat Leakage Test Procedure Class I

    (See 4.2.1) See Paragraph 4.2.1 None

    Class II (See 4.2.2)

    0.5% of rated valve capacity Type A (See 5.1)

    Class III (See 4.2.3)

    0.1% of rated valve capacity Type A (See 5.1)

    Class IV (See 4.2.4)

    0.01% of rated valve capacity Type A (See 5.1)

    Class V (See 4.2.5)

    5 x 10-4 ml per minute of water per inch of seat diameter perpsi differential

    Type B (See 5.2)

    5 x 10-12 m3 per second of water per mm of seat diameter per bardifferential

    Type B (See 5.2)

    4.7 standard ml per minute of air per inch of orificediameter

    Type B1 (See 5.3)

    11.1 x 10-6 standard m3 per hour of air per mm of orificediameter

    Type B1 (See 5.3)

    Class VI (See 4.2.6)

    Leakage per Paragraph 5.4.4 as expressed in ml per minute versusseat diameter

    Type C (See 5.4)

    and seal tightness. Use test procedure Type B using water at themaximum operating differential pressure or Type B1 by using air atthe specified conditions. 4.2.6 CLASS VI. This class establishesthe maximum permissible seat leakage generally associated withresilient seating control valves either unbalanced or balancedsingle-seat with "O" rings or similar gapless seals. Use testprocedure Type C. 5. TEST PROCEDURES Warning: Provisions should bemade to avoid overpressuring of measuring devices resulting frominadvertent opening of the valve plug. 5.1 Test Procedure Type A5.1.1 Test medium shall be clean air or water at 10-51C (50-125F).5.1.2 Pressure of test medium shall be 3-4 bar (45-60 psig) orwithin +/- 5 percent of the maximum operating differentialpressure, whichever is less. 5.1.3 Leakage flow and pressure datashall be accurate to +/- 10 percent of reading. 5.1.4 The testfluid shall be applied to the normal or specified valve body inlet.The valve body outlet may be open to atmosphere or connected to alow headloss measuring device.

    5.1.5 The actuator shall be adjusted to meet the operatingconditions specified. The full normal closing thrust as applied byair pressure, a spring, or other means shall then be applied. Noallowance or adjustment shall be made to compensate for anyincrease in seat load obtained when the test differential is lessthan the maximum valve operating differential pressure. 5.1.6 Onvalve body assemblies made for stock, tested without the actuator,a test fixture should be utilized which applies a net seat load notexceeding the manufacturer's normal expected load under maximumservice conditions. 5.1.7 On water test, care shall be taken toeliminate air pockets in the valve body and piping. 5.1.8 Theleakage rate thus obtained can then be compared to the calculatedvalues for Classes II, III and IV. See Table 1. 5.2 Test ProcedureType B 5.2.1 Test fluid shall be clean water at 10-52C(50-125F).

  • www.bzfxw.com

    3

    5.2.2 The water test differential pressure shall be within +/- 5percent of the maximum service pressure drop across the valve plug,not exceeding the maximum operating pressure at room temperature asdetermined by ANSI B16.1, B16.5, or B16.34, or some lesser pressureby individual agreement. Pressure measurement accuracy is to be inaccordance with paragraph 5.1.3. 5.2.3 The fluid shall be appliedto the normal specified inlet of the valve body. The valve plugshall be opened and the valve body assembly filled completely withwater, including outlet portion and any downstream connectingpiping, and then stroked closed. 5.2.4 The water test differentialpressure as specified in 5.2.2 is then applied with the actuatoradjusted to meet the operating conditions specified. The netactuator thrust shall be the specified maximum. Net actuator thrustabove the specified maximum is not to be used. 5.2.5 When leakageflow is stabilized, the quantity should be observed over a periodof time sufficient to obtain the accuracy under paragraph5.1.3.

    5.2.6 The leakage rate thus obtained shall not be greater thanthe value calculated from the definition of maximum seat leakagefor Class V as shown in Table 1. The nominal seat diameter isunderstood to be the diameter at the point of seating contact tothe nearest 2 mm (1/16 inch). 5.3 Test Procedure Type B1 5.3.1 Testmedium shall be clean air or nitrogen gas at 10-52C (50-125F).5.3.2 Inlet pressure of test medium shall be 3.5 barg, (50 psi).5.3.3 Leakage flow and pressure data shall be accurate to 10percent of reading. 5.3.4 The test fluid shall be applied to thenormal or specified valve body inlet, and the outlet connected to asuitable measuring device. 5.3.5 The leakage rate thus obtainedshall not be greater than the value calculated from the definitionof maximum seat leakage for Class V as shown in Table 1. Theorifice diameter is understood to be the diameter at the point ofseating contact to the nearest 2 millimeters (1/16 inch).

    TABLE 2 Nominal Seat Diameter

    Millimeters (Inches) ml per Minute Bubbles per Minute* < 25(< 1)** 0.15 1**

    38 (1.5) 0.30 2 51 (2) 0.45 3

    64 (2.5) 0.60 4 76 (3) 0.90 6

    102 (4) 1.70 11 152 (6) 4.00 27 203 (8) 6.75 45

    250 (10) 11.1 - 300 (12) 16.0 - 350 (14) 21.6 - 400 (16) 28.4-

    *Bubbles per minute as tabulated are a suggested alternativebased on a suitable calibrated measuring device, in this case, a 6mm (0.25 inch) O.D. x 1 mm (0.032 inch) wall tube submerged inwater to a depth of from 3 to 6 mm (0.125 to 0.25 inch). The tubeend shall be cut square and smooth with no chamfers or burrs andthe tube axis shall be perpendicular to the surface of the water.Other apparatus may be constructed and the number of bubbles perminute may differ from those shown as long as they correctlyindicate the flow in ml per minute. **If the valve seat diameterdiffers by more than 2 mm (0.08 inch) from one of the valueslisted, the leakage rate may be obtained by interpolation assumingthat the leakage rate varies as the square of the seatdiameter.

  • www.bzfxw.com

    4

    5.4 Test Procedure Type C - Class VI 5.4.1 Test medium shall beair or nitrogen gas at 10-52C (50-125F). 5.4.2 Pressure of the testmedium shall be the maximum rated differential pressure across thevalve plug or 3.5 bar (50 psig) whichever is the least. 5.4.3 Thetest fluid shall be applied to the normal or specified valve bodyinlet, and the outlet connected to a suitable measuring device.5.4.4 With the control valve adjusted to meet the operatingconditions specified (see paragraphs 5.1.5 and 5.1.6) and withsufficient time allowance for stabilizing flow, the leak rate shallnot exceed the values in Table 2. 6. REFERENCES 6.1 InternationalElectrical Commission (IEC) Standard 60534-4, Industrial ProcessControl Valves Inspection and Routine Testing.

    AMERICAN NATIONAL STANDARD

-------------------------------------------------------------AMERICAN NATIONAL STANDARD CONTROL VALVE SEAT LEAKAGE --------------------------------------------------------------&#8230;

CONTROL VALVE SEAT. LEAKAGE--------------------------------------------------------------. The procedures of the American National. Standards Institute require that action be taken to reaffirm,. revise, or withdraw this standard no later than five years from the. date of publication.. The FCI Control Valve and. Regulator Section notes that FCI 70-2 has been intended to apply to. control valve seat leakage.. ANSI/FCI 70-2-2006 AMERICAN NATIONAL STANDARD Control Valve Seat. Leakage1.. The air leakage test and allowable leak rates for Class V are. equivalent to the water test and allowable water leakage rates for. a water test performed at a nominal temperature of 60F.. 4.1 The. maximum allowable seat leakage as specified for each class shall. not exceed the seat leakage in Table 1 using the test procedure as. defined in Section 5.. The quantity of test fluid (air or water) that would pass. through the valve at rated travel under the stated pressure. conditions as determined by the appropriate equations and. manufacturer's ratings.. This class establishes the maximum permissible. seat leakage generally associated with 6 / 11

ANSI/FCI 70-2-2006AMERICAN NATIONAL STANDARDCONTROL VALVE SEAT LEAKAGEFluid Controls Institute, Inc. Sponsor:Fluid Controls Institute, Inc. 1300 Sumner Ave Cleveland, Ohio44115-2851iiANSI/FCI 70-2-2006 AMERICAN NATIONAL STANDARD Control Valve SeatLeakage Sponsor Fluid Controls Institute, Inc.www.bzf...

ANSI/FCI 70-2-2006 AMERICAN NATIONAL STANDARD Control Valve SeatLeakage Sponsor Fluid Controls Institute, Inc.. Purchasers of American National Standards mayreceive current information on all standards by calling or writingthe American National Standards Institute.. The FCI Control Valve andRegulator Section notes that FCI 70-2 has been intended to apply tocontrol valve seat leakage.. If line isolation and/or absolute tightshut-off is a normal expectation of the valve application, the FCIControl Valve and Regulator Sections recommend specifying anotherstandard, such as API 598, Valve Test and Inspection.. PURPOSE 1.1 This standard establishes a series of seatleakage classes for control valves and defines the test procedures.2.. The air leakage test and allowableleak rates for Class V are equivalent to the water test andallowable water leakage rates for a water test performed at anominal temperature of 60F.. DEFINITIONS 3.1 Control Valve 3.1.1A valve with a power positioning actuator for moving a closuremember to any position relative to a valve seat or seats inresponse to and in proportion to an external signal.. 4.2 Leakage Classes 4.2.1 CLASS I.A modification of any Class II, III or IV valve where design intentis the same as the basic class, but by agreement between user andsupplier, no test is required.. This classestablishes the maximum permissible leakage generally associatedwith commercial double-seat control valves or balanced single-seatcontrol valves with a piston ring seal and metal-to-metal seats.Use test procedure Type A.. This class establishes themaximum permissible leakage generally associated with commercialunbalanced single-seat control valves and balanced single-seatcontrol valves with extra tight piston rings or other sealing meansand metal-to-metal seats.. Leakage Class Maximum Seat Leakage Test Procedure Class I. This class establishesthe maximum permissible seat leakage generally associated withresilient seating control valves either unbalanced or balancedsingle-seat with "O" rings or similar gapless seals.. 5.1 Test Procedure Type A5.1.1 Test medium shall be clean air or water at 10-51C (50-125F).5.1.2 Pressure of test medium shall be 3-4 bar (45-60 psig) orwithin +/- 5 percent of the maximum operating differentialpressure, whichever is less.. **If the valve seat diameterdiffers by more than 2 mm (0.08 inch) from one of the valueslisted, the leakage rate may be obtained by interpolation assumingthat the leakage rate varies as the square of the seatdiameter.. 5.4.3 Thetest fluid shall be applied to the normal or specified valve bodyinlet, and the outlet connected to a suitable measuring device.5.4.4 With the control valve adjusted to meet the operatingconditions specified (see paragraphs 5.1.5 and 5.1.6) and withsufficient time allowance for stabilizing flow, the leak rate shallnot exceed the values in Table 2.

-------------------------------------------------------------AMERICAN NATIONAL STANDARDCONTROL VALVE SEAT LEAKAGEANS...

CONTROL VALVE SEAT LEAKAGE. AMERICAN NATIONAL STANDARD Control Valve Seat Leakage. Retop Valve Repair Co. , Ltd. ReTop Valve Repair Co., Ltd. was founded in 1994 and the first professional valve repair and restoration company in China, dedicated to professional solutions on valve metal sealing surface repair and valve inspection aspects.. With nearly two decades R&D on equipment and repairing services, now the Company had developed into a diversified company with professional industrial valve repair and restoration service, and production of valve repair equipment, valve repairing kit as well, having a group of experienced, well-trained valve inspection, repairing experts and research personnel.. The independent R&D and intellectual property multifunctional vertical valve repair and grinding machine, valve repairing kit and special grinding head, which break through the bottleneck that one kind of valve repair equipment could only repair for one single type of valve, it could repair and restore the ball valves, gate valves, stop valves, safety valves, regulating valves, power station valves, desulfuration valves etc.. The FCI Control Valve and Regulator Section notes that FCI 70-2 has been intended to apply to control valve seat leakage.. If line isolation and/or absolute tight shut-off is a normal expectation of the valve application, the FCI Control Valve and Regulator Sections recommend specifying another standard, such as API 598, “Valve Test and Inspection.”. ANSI/FCI 70-2-2006 AMERICAN NATIONAL STANDARD Control Valve Seat Leakage 1.. classes for control valves and defines the test. **If the valve seat diameter differs by more than 2 mm (0.08 inch) from one of the values listed, the leakage rate may be obtained by interpolation assuming that the leakage rate varies as the square of the seat diameter.. 5.4.2 Pressure of the test medium shall be the maximum rated differential pressure across the valve plug or 3.5 bar (50 psig) whichever is the least.. 5.4.3 The test fluid shall be applied to the normal or specified valve body inlet, and the outlet connected to a suitable measuring device.

-------------------------------------------------------------AMERICAN NATIONAL STANDARDCONTROL VALVE SEAT LEAKAGEANS...

CONTROL VALVE SEAT LEAKAGE. AMERICAN NATIONAL STANDARD Control Valve Seat Leakage. The independent R&D and intellectual property multifunctional vertical valve repair and grinding machine, valve repairing kit and special grinding head, which break through the bottleneck that one kind of valve repair equipment could only repair for one single type of valve, it could repair and restore the ball valves, gate valves, stop valves, safety valves, regulating valves, power station valves, desulfuration valves etc.. ANSI/FCI 70-2-2006 AMERICAN NATIONAL STANDARD Control Valve Seat Leakage 1.. 3.5 Seat Leakage.. 5.4.3 The test fluid shall be applied to the normal or specified valve body inlet, and the outlet connected to a suitable measuring device.

-------------------------------------------------------------AMERICAN NATIONAL STANDARDCONTROL VALVE SEAT LEAKAGEANS...

Retop Valve Repair Co. , Ltd. ReTop Valve Repair Co., Ltd. was founded in 1994 and the first professional valve repair and restoration company in China, dedicated to professional solutions on valve metal sealing surface repair and valve inspection aspects.. With nearly two decades R&D on equipment and repairing services, now the Company had developed into a diversified company with professional industrial valve repair and restoration service, and production of valve repair equipment, valve repairing kit as well, having a group of experienced, well-trained valve inspection, repairing experts and research personnel.. The independent R&D and intellectual property multifunctional vertical valve repair and grinding machine, valve repairing kit and special grinding head, which break through the bottleneck that one kind of valve repair equipment could only repair for one single type of valve, it could repair and restore the ball valves, gate valves, stop valves, safety valves, regulating valves, power station valves, desulfuration valves etc.. The FCI Control Valve and Regulator Section notes that FCI 70-2 has been intended to apply to control valve seat leakage.. If line isolation and/or absolute tight shut-off is a normal expectation of the valve application, the FCI Control Valve and Regulator Sections recommend specifying another standard, such as API 598, “Valve Test and Inspection.”. **If the valve seat diameter differs by more than 2 mm (0.08 inch) from one of the values listed, the leakage rate may be obtained by interpolation assuming that the leakage rate varies as the square of the seat diameter.

You might also like

Latest Posts

Article information

Author: Dr. Pierre Goyette

Last Updated: 09/14/2022

Views: 6696

Rating: 5 / 5 (70 voted)

Reviews: 85% of readers found this page helpful

Author information

Name: Dr. Pierre Goyette

Birthday: 1998-01-29

Address: Apt. 611 3357 Yong Plain, West Audra, IL 70053

Phone: +5819954278378

Job: Construction Director

Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking

Introduction: My name is Dr. Pierre Goyette, I am a enchanting, powerful, jolly, rich, graceful, colorful, zany person who loves writing and wants to share my knowledge and understanding with you.