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EN 1267:2012

Current
Current

The latest, up-to-date edition.

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

01-18-2012

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

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.

DevelopmentNote
Supersedes PREN 1267. (02/2012)
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

Standards Relationship
NBN EN 1267 : 2012 Identical
UNI EN 1267 : 2012 Identical
I.S. EN 1267:2012 Identical
PN EN 1267 : 2012 Identical
DIN EN 1267:2012-04 Identical
SN EN 1267 : 2012 Identical
NS EN 1267 : 2012 Identical
NEN EN 1267 : 2012 Identical
NF EN 1267 : 2012 Identical
UNE-EN 1267:2012 Identical
BS EN 1267:2012 Identical

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

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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