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  • EN 1267:2012

    Current The latest, up-to-date edition.

    Industrial valves - Test of flow resistance using water as test fluid

    Available format(s): 

    Language(s): 

    Published date:  18-01-2012

    Publisher:  Comite Europeen de Normalisation

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Test facility
    5 Test procedure
    6 Calculation
    7 Test report
    Annex A (informative) - Lower zeta limit
            considerations
    Annex B (informative) - Flow rate and
            physical phenomena of flow
            through a valve
    Annex C (informative) - Uncertainty on
            measurement
    Annex D (informative) - Evaluation of
            uncertainty of flow rate
            coefficient (K[v]) and pressure
            losses coefficient (zeta)
    Bibliography

    Abstract - (Show below) - (Hide below)

    This European Standard specifies a method for determining valve pressure loss coefficient and fluid flow coefficient using water as test fluid. This method is suitablefor valves with low zeta values but higher than 0,1 by determining pressure loss, with respect to fluid flow rate and specific gravity, andfor valves with equal inlet and outlet nominal size.Industrial process control valves are excluded from this European Standard.NOTE 1For zeta values above 6, the pressure loss coefficient inaccuracy is higher than the pressure loss caused by the test tubes. It becomes the same configuration of tests as in EN 60534-2-3.NOTE 2If using air as test fluid, other standards e.g. EN 60534-2-3 and ISO 6358 should be referred to.

    General Product Information - (Show below) - (Hide below)

    Development Note Supersedes PREN 1267. (02/2012)
    Document Type Standard
    Publisher Comite Europeen de Normalisation
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    EN 13175:2014 LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) PRESSURE VESSEL VALVES AND FITTINGS
    BS ISO 9644:2008 Agricultural irrigation equipment. Pressure losses in irrigation valves. Test method
    17/30356070 DC : 0 BS ISO 9644 - AGRICULTURAL IRRIGATION EQUIPMENT - PRESSURE LOSSES IN IRRIGATION VALVES - TEST METHOD
    BS EN 593:2017 Industrial valves. Metallic butterfly valves for general purposes
    03/118276 DC : DRAFT NOV 2003 BS EN 14812-1 - WATER CONDITIONING EQUIPMENT INSIDE BUILDINGS - CHEMICAL DOSING SYSTEMS - REQUIREMENTS FOR PERFORMANCE AND SAFETY TESTING - PART 1: PRE-SET DOSING SYSTEMS
    13/30271153 DC : 0 BS ISO 13693-2 - IRRIGATION EQUIPMENT - SAFETY DEVICES FOR CHEMIGATION - PART 2: CHEMIGATION VALVE ASSEMBLIES FROM DN 75 TO DN 350
    01/122758 DC : DRAFT JULY 2001 ISO/DIS 16135 - INDUSTRIAL VALVES - BALL VALVES OF THERMOPLASTIC MATERIALS
    04/30126819 DC : DRAFT DEC 2004 EN 15096 - HOSE UNION ANTI-VACUUM VALVES - DN15 TO DN25 INCLUSIVE FAMILY H, TYPE B AND TYPE D - GENERAL TECHNICAL SPECIFICATION
    01/709788 DC : DRAFT JUN 2001 PREN ISO 21787 - INDUSTRIAL VALVES - GLOBE VALVES OF THERMOPLASTIC MATERIALS
    01/709786 DC : DRAFT JUN 2001 PREN ISO 16137 - INDUSTRIAL VALVES - CHECK VALVES OF THERMOPLASTIC MATERIALS
    I.S. EN ISO 16136:2006 INDUSTRIAL VALVES - BUTTERFLY VALVES OF THERMOPLASTICS MATERIALS
    I.S. EN ISO 21787:2006 INDUSTRIAL VALVES - GLOBE VALVES OF THERMOPLASTICS MATERIALS
    I.S. EN ISO 16138:2006 INDUSTRIAL VALVES - DIAPHRAGM VALVES OF THERMOPLASTICS MATERIALS
    I.S. EN ISO 16139:2006 INDUSTRIAL VALVES - GATE VALVES OF THERMOPLASTICS MATERIALS
    I.S. EN ISO 16135:2006 INDUSTRIAL VALVES - BALL VALVES OF THERMOPLASTICS MATERIALS
    ONORM EN ISO 16139 : 2008 INDUSTRIAL VALVES - GATE VALVES OF THERMOPLASTICS MATERIALS
    I.S. EN ISO 16137:2006 INDUSTRIAL VALVES - CHECK VALVES OF THERMOPLASTICS MATERIALS
    DIN EN 13434:2006-05 DEVICES TO PREVENT POLLUTION BY BACKFLOW OF POTABLE WATER - MECHANICAL DISCONNECTOR, HYDRAULIC ACTUATED - FAMILY G - TYPE B
    DIN EN 14268 E : 2005 IRRIGATION TECHNIQUES - METERS FOR IRRIGATION WATER
    DIN EN 13433:2006-05 DEVICES TO PREVENT POLLUTION BY BACKFLOW OF POTABLE WATER - MECHANICAL DISCONNECTOR, DIRECT ACTUATED - FAMILY G - TYPE A
    DIN EN 14267 E : 2004 IRRIGATION TECHNIQUES - IRRIGATION HYDRANTS
    BS EN 14267:2004 Irrigation techniques. Irrigation hydrants
    BS EN ISO 16135:2006 Industrial valves. Ball valves of thermoplastic materials
    BS ISO 6358-3:2014 Pneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids Method for calculating steady-state flow-rate characteristics of systems
    BS EN ISO 16139:2006 Industrial valves. Gate valves of thermoplastic materials
    BS EN 14367:2005 Non controllable backflow preventer with different pressure zones. Family C, type A
    I.S. EN 14812:2005 WATER CONDITIONING EQUIPMENT INSIDE BUILDINGS - CHEMICAL DOSING SYSTEMS - PRE-SET DOSING SYSTEMS - REQUIREMENTS FOR PERFORMANCE, SAFETY AND TESTING
    EN 12729:2002 Devices to prevent pollution by backflow of potable water - Controllable backflow preventer with reduced pressure zone - Family B - Type A
    EN 1074-3:2000 Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 3: Check valves
    DIN EN 14367:2005-10 Non controllable backflow preventer with different pressure zones - Family C, type A
    EN 13433:2006 Devices to prevent pollution by backflow of potable water - Mechanical disconnector, direct actuated - Family G, type A
    EN 1074-5:2001 Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 5: Control valves
    I.S. EN 12729:2002 DEVICES TO PREVENT POLLUTION BY BACKFLOW OF POTABLE WATER - CONTROLLABLE BACKFLOW PREVENTER WITH REDUCED PRESSURE ZONE - FAMILY B - TYPE A
    BS ISO 13693-2:2015 Irrigation equipment. Safety devices for chemigation Chemigation valve assemblies from DN 75 (3”) to DN 350 (14”)
    ISO 9644:2008 Agricultural irrigation equipment Pressure losses in irrigation valves Test method
    UNE-EN 13175:2015 LPG Equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings
    16/30339483 DC : 0 BS EN 593 - INDUSTRIAL VALVES - METALLIC BUTTERFLY VALVES FOR GENERAL PURPOSES
    07/30153381 DC : 0 BS ISO 9644 - AGRICULTURAL IRRIGATION EQUIPMENT - PRESSURE LOSSES IN IRRIGATION VALVES - TEST METHOD
    01/122757 DC : DRAFT JULY 2001 ISO/DIS 16138 - INDUSTRIAL VALVES - DIAPHRAGM VALVES OF THERMOPLASTIC MATERIALS
    I.S. EN 593:2017 INDUSTRIAL VALVES - METALLIC BUTTERFLY VALVES FOR GENERAL PURPOSES
    BS EN 13175:2014 LPG Equipment and accessories. Specification and testing for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings
    ONORM EN ISO 16136 : 2008 INDUSTRIAL VALVES - BUTTERFLY VALVES OF THERMOPLASTICS MATERIALS
    ONORM EN ISO 16137 : 2008 INDUSTRIAL VALVES - CHECK VALVES OF THERMOPLASTICS MATERIALS
    DIN EN 14268:2005-11 IRRIGATION TECHNIQUES - METERS FOR IRRIGATION WATER
    DIN EN 14267:2004-10 IRRIGATION TECHNIQUES - IRRIGATION HYDRANTS
    ISO 16136:2006 Industrial valves Butterfly valves of thermoplastics materials
    17/30362889 DC : 0 BS EN 13175 - LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) PRESSURE VESSEL VALVES AND FITTINGS
    BS EN 14812 : 2005 WATER CONDITIONING EQUIPMENT INSIDE BUILDINGS - CHEMICAL DOSING SYSTEMS - PRE-SET DOSING SYSTEMS - REQUIREMENTS FOR PERFORMANCE, SAFETY AND TESTING
    BS EN 12729:2002 Devices to prevent pollution by backflow of potable water. Controllable backflow preventer with reduced pressure zone. Family B. Type A
    UNE-EN 593:2009 Industrial valves - Metallic butterfly valves
    I.S. EN 1074-6:2009 VALVES FOR WATER SUPPLY - FITNESS FOR PURPOSE REQUIREMENTS AND APPROPRIATE VERIFICATION TESTS - PART 6: HYDRANTS
    I.S. EN 12266-2:2012 INDUSTRIAL VALVES - TESTING OF METALLIC VALVES - PART 2: TESTS, TEST PROCEDURES AND ACCEPTANCE CRITERIA - SUPPLEMENTARY REQUIREMENTS
    I.S. EN 13434:2006 DEVICES TO PREVENT POLLUTION BY BACKFLOW OF POTABLE WATER - MECHANICAL DISCONNECTOR, HYDRAULIC ACTUATED - FAMILY G, TYPE B
    I.S. EN 13433:2006 DEVICES TO PREVENT POLLUTION BY BACKFLOW OF POTABLE WATER - MECHANICAL DISCONNECTOR, DIRECT ACTUATED - FAMILY G, TYPE A
    05/30138214 DC : DRAFT AUG 2005 ISO 9635-3 - AGRICULTURAL IRRIGATION EQUIPMENT - IRRIGATION VALVES - PART 3: CHECK VALVES
    BS ISO 9635-3:2014 Agricultural irrigation equipment. Irrigation valves Check valves
    09/30202316 DC : 0 BS EN 12514-4 - PARTS FOR SUPPLY SYSTEMS FOR CONSUMING UNITS WITH LIQUID FUELS - PART 4: SAFETY REQUIREMENTS AND TESTS - PIPINGS AND PARTS WITHIN PIPELINES
    10/30218988 DC : 0 BS EN 13175 - LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) TANK VALVES AND FITTINGS
    I.S. EN 12874:2001 FLAME ARRESTERS - PERFORMANCE REQUIREMENTS, TEST METHODS AND LIMITS FOR USE
    08/30187521 DC : 0 BS EN 593 - INDUSTRIAL VALVES - METALLIC BUTTERFLY VALVES
    01/122755 DC : DRAFT JULY 2001 ISO/DIS 21787 - INDUSTRIAL VALVES - GLOBE VALVES OF THERMOPLASTIC MATERIALS
    01/709785 DC : DRAFT JUN 2001 PREN ISO 16136 - INDUSTRIAL VALVES - BUTTERFLY VALVES OF THERMOPLASTIC MATERIALS
    ISO 9635-3:2014 Agricultural irrigation equipment Irrigation valves Part 3: Check valves
    EN 12266-2:2012 Industrial valves - Testing of metallic valves - Part 2: Tests, test procedures and acceptance criteria - Supplementary requirements
    ONORM EN ISO 16138 : 2008 INDUSTRIAL VALVES - DIAPHRAGM VALVES OF THERMOPLASTICS MATERIALS
    DIN EN 1074-6:2009-03 VALVES FOR WATER SUPPLY - FITNESS FOR PURPOSE REQUIREMENTS AND APPROPRIATE VERIFICATION TESTS - PART 6: HYDRANTS
    DIN EN ISO 16135:2006-06 INDUSTRIAL VALVES - BALL VALVES OF THERMOPLASTICS MATERIALS
    DIN EN 14812 E : 2007 WATER CONDITIONING EQUIPMENT INSIDE BUILDINGS - CHEMICAL DOSING SYSTEMS - PRE-SET DOSING SYSTEMS - REQUIREMENTS FOR PERFORMANCE, SAFETY AND TESTING
    BS EN 1074-3:2000 Valves for water supply. Fitness for purpose requirements and appropriate verification tests Check valves
    BS EN ISO 16138:2006 Industrial valves. Diaphragm valves of thermoplastics materials
    ISO 16135:2006 Industrial valves Ball valves of thermoplastics materials
    UNI EN 14268 : 2006 IRRIGATION TECHNIQUES - METERS FOR IRRIGATION WATER
    EN ISO 21787:2006 Industrial valves - Globe valves of thermoplastics materials (ISO 21787:2006)
    UNI EN 1074-6 : 2009 VALVES FOR WATER SUPPLY - FITNESS FOR PURPOSE REQUIREMENTS AND APPROPRIATE VERIFICATION TESTS - PART 6: HYDRANTS
    UNI EN 12266-2 : 2012 INDUSTRIAL VALVES - TESTING OF METALLIC VALVES - PART 2: TESTS, TEST PROCEDURES AND ACCEPTANCE CRITERIA - SUPPLEMENTARY REQUIREMENTS
    14/30300117 DC : 0 BS EN 13175 - LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) PRESSURE VESSEL VALVES AND FITTINGS
    13/30282119 DC : 0 BS ISO 9635-3 - AGRICULTURAL IRRIGATION EQUIPMENT - IRRIGATION VALVES - PART 3: CHECK VALVES
    PREN 593 : DRAFT 2016 INDUSTRIAL VALVES - METALLIC BUTTERFLY VALVES FOR GENERAL PURPOSES
    ISO 13693-2:2015 Irrigation equipment Safety devices for chemigation Part 2: Chemigation valve assemblies from DN 75 (3") to DN 350 (14")
    ONORM EN ISO 16135 : 2008 INDUSTRIAL VALVES - BALL VALVES OF THERMOPLASTICS MATERIALS
    DIN EN ISO 21787 E : 2006 INDUSTRIAL VALVES - GLOBE VALVES OF THERMOPLASTICS MATERIALS
    DIN EN ISO 16138:2006-06 INDUSTRIAL VALVES - DIAPHRAGM VALVES OF THERMOPLASTICS MATERIALS
    DIN EN ISO 16136:2006-06 INDUSTRIAL VALVES - BUTTERFLY VALVES OF THERMOPLASTICS MATERIALS
    DIN EN ISO 16137:2006-06 INDUSTRIAL VALVES - CHECK VALVES OF THERMOPLASTICS MATERIALS
    DIN EN ISO 16139:2006-06 INDUSTRIAL VALVES - GATE VALVES OF THERMOPLASTICS MATERIALS
    ISO 21787:2006 Industrial valves Globe valves of thermoplastics materials
    BS EN 14268:2005 Irrigation techniques. Meters for irrigation water
    BS EN ISO 16137:2006 Industrial valves. Check valves of thermoplastic materials
    BS EN 1074-5:2001 Valves for water supply. Fitness for purpose requirements and appropriate verification tests Control valves
    BS EN 13959:2004 Anti-pollution check valves. DN 6 to DN 250 inclusive Family E, type A, B, C, and D
    BS EN ISO 21787:2006 Industrial valves. Globe valves of thermoplastics materials
    UNE-EN 1074-6:2011 Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 6: Hydrants
    ISO 16137:2006 Industrial valves Check valves of thermoplastics materials
    BS EN ISO 16136:2006 Industrial valves. Butterfly valves of thermoplastic materials
    UNE-EN 12266-2:2013 Industrial valves - Testing of metallic valves - Part 2: Tests, test procedures and acceptance criteria - Supplementary requirements
    ISO 16139:2006 Industrial valves Gate valves of thermoplastics materials
    BS EN 1074-2:2000 Valves for water supply. Fitness for purpose requirements and appropriate verification tests Isolating valves
    BS EN 1074-6:2008 Valves for water supply. Fitness for purpose requirements and appropriate verification tests Hydrants
    BS EN 13434:2006 Devices to prevent pollution by backflow of potable water. Mechanical disconnector, hydraulic actuated. Family G, type B
    BS EN 12266-2:2012 Industrial valves. Testing of metallic valves Tests, test procedures and acceptance criteria. Supplementary requirements
    DIN EN ISO 21787:2006-06 INDUSTRIAL VALVES - GLOBE VALVES OF THERMOPLASTICS MATERIALS
    ISO 6358-3:2014 Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Part 3: Method for calculating steady-state flow-rate characteristics of systems
    EN ISO 16139:2006 Industrial valves - Gate valves of thermoplastics materials (ISO 16139:2006)
    EN 14812:2005+A1:2007 Water conditioning equipment inside buildings - Chemical dosing systems - Pre-set dosing systems - Requirements for performance, safety and testing
    EN ISO 16135:2006 Industrial valves - Ball valves of thermoplastics materials (ISO 16135:2006)
    EN ISO 16136:2006 Industrial valves - Butterfly valves of thermoplastics materials (ISO 16136:2006)
    EN 13959:2004 Anti-pollution check valves - DN 6 to DN 250 inclusive family E, type A, B, C and D
    EN ISO 16138:2006 Industrial valves - Diaphragm valves of thermoplastics materials (ISO 16138:2006)
    EN 14268:2005/AC:2007 IRRIGATION TECHNIQUES - METERS FOR IRRIGATION WATER
    EN 593:2017 Industrial valves - Metallic butterfly valves for general purposes
    EN ISO 16137:2006 Industrial valves - Check valves of thermoplastics materials (ISO 16137:2006)
    EN 14367:2005 Non controllable backflow preventer with different pressure zones - Family C, type A
    EN 14267:2004/AC:2008 IRRIGATION TECHNIQUES - IRRIGATION HYDRANTS
    UNI EN 13175 : 2015 LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) PRESSURE VESSEL VALVES AND FITTINGS
    01/709784 DC : DRAFT JUN 2001 PREN ISO 16135 - INDUSTRIAL VALVES - BALL VALVES OF THERMOPLASTIC MATERIALS
    09/30202313 DC : 0 BS EN 12514-3 - PARTS FOR SUPPLY SYSTEMS FOR CONSUMING UNITS WITH LIQUID FUELS - PART 3: SAFETY REQUIREMENTS AND TESTS - VALVES AND METERS
    01/709787 DC : DRAFT JUN 2001 PREN ISO 16138 - INDUSTRIAL VALVES - DIAPHRAGM VALVES OF THERMOPLASTIC MATERIALS
    01/122754 DC : DRAFT JULY 2001 ISO/DIS 16137 - INDUSTRIAL VALVES - CHECK VALVES OF THERMOPLASTIC MATERIALS
    I.S. EN 13175:2014 LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) PRESSURE VESSEL VALVES AND FITTINGS
    DIN EN 13175:2015-02 LPG EQUIPMENT AND ACCESSORIES - SPECIFICATION AND TESTING FOR LIQUEFIED PETROLEUM GAS (LPG) PRESSURE VESSEL VALVES AND FITTINGS
    ONORM EN ISO 21787 : 2008 INDUSTRIAL VALVES - GLOBE VALVES OF THERMOPLASTICS MATERIALS
    DIN EN 14367 E : 2005 NON CONTROLLABLE BACKFLOW PREVENTER WITH DIFFERENT PRESSURE ZONES - FAMILY C, TYPE A
    BS EN 12874:2001 Flame arresters. Performance requirements, test methods and limits for use
    11/30254394 DC : 0 BS ISO 6358-3 - PNEUMATIC FLUID POWER - DETERMINATION OF FLOW-RATE CHARACTERISTICS OF COMPONENTS - PART 3: METHOD FOR CALCULATING STEADY-STATE FLOW-RATE CHARACTERISTICS OF ASSEMBLIES
    ISO 16138:2006 Industrial valves Diaphragm valves of thermoplastics materials
    BS EN 13433:2007 Devices to prevent pollution by backflow of potable water. Mechanical disconnector, direct actuated. Family G, type A
    DIN EN 14812:2007-09 WATER CONDITIONING EQUIPMENT INSIDE BUILDINGS - CHEMICAL DOSING SYSTEMS - PRE-SET DOSING SYSTEMS - REQUIREMENTS FOR PERFORMANCE, SAFETY AND TESTING
    EN 1074-6:2008 Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 6: Hydrants
    EN 13434:2006 Devices to prevent pollution by backflow of potable water - Mechanical disconnector, hydraulic actuated - Family G, type B
    DIN EN 1074-2:2004-07 Valves for water supply - Fitness for purpose requirements and appropriate verification tests - Part 2: Isolating valves
    DIN EN 12266-2:2012-04 Industrial valves - Testing of metallic valves - Part 2: Tests, test procedures and acceptance criteria - Supplementary requirements
    DIN EN 13959:2005-01 Anti-pollution check valves - DN 6 to DN 250 inclusive - Family E, type A, B, C and D; German version EN 13959:2004
    EN 1074-2:2000/A1:2004 VALVES FOR WATER SUPPLY - FITNESS FOR PURPOSE REQUIREMENTS AND APPROPRIATE VERIFICATION TESTS - PART 2 - ISOLATING VALVES
    EN 12874 : 2001 FLAME ARRESTERS - PERFORMANCE REQUIREMENTS, TEST METHODS AND LIMITS FOR USE

    Standards Referencing This Book - (Show below) - (Hide below)

    EN 1057:2006+A1:2010 Copper and copper alloys - Seamless, round copper tubes for water and gas in sanitary and heating applications
    EN 24006:1993 Measurement of fluid flow in closed conduits - Vocabulary and symbols (ISO 4006:1991)
    ISO 6358:1989 Pneumatic fluid power Components using compressible fluids Determination of flow-rate characteristics
    ISO 6708:1995 Pipework components Definition and selection of DN (nominal size)
    EN ISO 1127:1996 Stainless steel tubes - Dimensions, tolerances and conventional masses per unit length (ISO 1127:1992)
    EN ISO 6708:1995 Pipework components - Definition and selection of DN (nominal size) (ISO 6708:1995)
    ISO 7-1:1994 Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation
    ISO 4200:1991 Plain end steel tubes, welded and seamless — General tables of dimensions and masses per unit length
    EN 60534-2-1:2011/AC:2015 INDUSTRIAL-PROCESS CONTROL VALVES - PART 2-1: FLOW CAPACITY - SIZING EQUATIONS FOR FLUID FLOW UNDER INSTALLED CONDITIONS (IEC 60534-2-1:2011)
    ISO 65:1981 Carbon steel tubes suitable for screwing in accordance with ISO 7-1
    EN 60534-2-3:2016 Industrial-process control valves - Part 2-3: Flow capacity - Test procedures
    ISO 7194:2008 Measurement of fluid flow in closed conduits — Velocity-area methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes
    IEC 60534-2-3:2015 Industrial-process control valves - Part 2-3: Flow capacity - Test procedures
    ISO 7598:1988 Stainless steel tubes suitable for screwing in accordance with ISO 7-1
    IEC 60534-2-1:2011 Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
    ISO 4006:1991 Measurement of fluid flow in closed conduits — Vocabulary and symbols
    EN 736-3:2008 Valves - Terminology - Part 3: Definition of terms
    ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
    ISO 1127:1992 Stainless steel tubes Dimensions, tolerances and conventional masses per unit length
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