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  • BS 1042-2.1:1983

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Measurement of fluid flow in closed conduits. Velocity area methods Method using Pitot static tubes

    Available format(s):  Hardcopy, PDF

    Superseded date:  31-08-2008

    Language(s):  English

    Published date:  31-10-1983

    Publisher:  British Standards Institution

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

    National foreword
    Committees responsible
    Method
    1. Scope and field of application
    2. Symbols and definitions
    3. Principle
    4. Design of Pitot tubes
    5. Requirements for use of Pitot tubes
    6. Positioning of Pitot tube
    7. Velocity computation
    8. Determination of the discharge velocity by
         graphical integration of the velocity area
    9. Determination of the discharge velocity by
         numerical integration of the velocity area
    10. Determination of the discharge velocity by
         arithmetic methods
    11. Corrections of local velocity measurements
    12. Errors
    Annexes
    A. Pitot tubes
    B. Correction to the measuring position of Pitot
         tubes used in a transverse velocity gradient
    C. Study concerning turbulence correction
    D. Damping of pressure gauges
    E. Measurements with a Pitot tube in a compressible
         fluid
    F. Determination of coefficient m for extrapolation
         near the wall
    G. Example of calculation of the uncertainty on the
         flow-rate measurement by means of Pitot tubes
    Figures
    1. Computation of the discharge velocity in a
         circular conduit - Graphical integration in the
         area explored by the Pitot tubes
    2. Computation of the discharge velocity in a
         rectangular conduit - Graphical integration
         in the area explored by Pitot tubes
    3. Location of measuring points in a rectangular
         cross-section conduit in the case of the 'log-
         linear' method using 26 points
    4. Position of the measuring points in a rectangular
         conduit in the case of the 'log Tchebycheff'
         method
    5. Variation of blockage constant with distance ahead
         of cylindrical stem in a closed conduit
    6. Overall correction to be added to volume flow
         rate to allow for Pitot-stem blockage
    7. Overall correction to be added to volume flow rate
         to allow for Pitot-displacement
    8. AMCA type
    9. NPL type with modified ellipsoidal nose
    10. Profile definition of the ellipsoidal head
    11. CETIAT type
    12. Values of (delta p psi - delta po) / delta po

    Abstract - (Show below) - (Hide below)

    Gives a method for the determination of the volume rate of flow of a regular flow in closed conduits. Covers the technology and maintenance of Pitot-static tubes, with the calculation of local velocities and computation of flowrate by velocity integration.

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

    Committee CPI/30
    Development Note Supersedes BS 1042-2(1964) (07/2004) Supersedes 76/21811 DC. (06/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By
    Supersedes

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

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    BS 6199-1.2:1991 Measurement of liquid flow in closed conduits using weighing and volumetric methods. Weighing method Procedures for checking static weighing systems
    I.S. EN 14989-2:2007 CHIMNEYS - REQUIREMENTS AND TEST METHODS FOR METAL CHIMNEYS AND MATERIAL INDEPENDENT AIR SUPPLY DUCTS FOR ROOM SEALED HEATING APPLICATIONS - PART 2: FLUE AND AIR SUPPLY DUCTS FOR ROOM SEALED APPLIANCES
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    BS 1042-1.5(1987) : 1987 MEASUREMENTS OF FLUID FLOW IN CLOSED CONDUITS - GUIDE TO THE EFFECT OF DEPARTURE FROM THE STANDARD CONDITIONS SPECIFIED IN SECTION 1.1
    BS EN 60041:1995 Field acceptance tests to determine the hydraulic performance of hydraulic turbines, storage pumps and pump-turbines
    BS 599:1966 Methods of testing pumps
    BS 4773-1.1:1991 Methods for testing and rating air terminal devices for air distribution systems. Aerodynamic testing Testing under laboratory conditions
    EN 13216-1:2004 Chimneys - Test methods for system chimneys - Part 1: General test methods
    BS EN 29104:1993 Measurement of fluid flow in closed conduits. Methods of evaluating the performance of electromagnetic flow-meters for liquids
    BS 848-1:1980 Fans for general purposes Methods of testing performance
    BS 5991:2006 Specification for indirect gas fired forced convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial space heating. Safety and performance requirements (excluding electrical requirements) (2nd family gases)
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    BS 4485-2:1988 Water cooling towers Methods for performance testing
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    BS 5990:2006 Specification for direct gas-fired forced convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial space heating. Safety and performance requirements (excluding electrical requirements) (2nd family gases)
    BS 5990:1981 Specification for direct gas fired forced convection air heaters for space heating (60 kW up to 2 MW input): safety and performance requirements (excluding electrical requirements) (2nd family gases)
    BS 7435-1:1991 Fibre cement flue pipes, fittings and terminals Specification for light quality fibre cement flue pipes, fittings and terminals
    BS 4979-1:1973 Methods for testing and rating air control devices for air distribution systems Aerodynamic testing of constant flow rate assemblies without a heat exchanger
    BS 7435-2:1991 Fibre cement flue pipes, fittings and terminals Specification for heavy quality fibre cement flue pipes, fittings and terminals
    SAE J 2084 : 2016 AERODYNAMIC TESTING OF ROAD VEHICLES - TESTING METHODS AND PROCEDURES
    BS 893:1978 Method for the measurement of the concentration of particulate material in ducts carrying gases
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    BS 3841-2:1994 Determination of smoke emission from manufactured solid fuels for domestic use Methods for measuring the smoke emission rate
    BS 1042-2.3:1984 Measurement of fluid flow in closed conduits. Velocity area methods Methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes
    BS 5991:1983 Specification for indirect gas fired forced convection air heaters for space heating (60 kW up to 2 MW input): safety and performance requirements (excluding electrical requirements) (2nd family gases)
    BS 7405:1991 Guide to selection and application of flowmeters for the measurement of fluid flow in closed conduits
    BS 6821:1988 Methods for aerodynamic testing of dampers and valves
    I.S. EN 13216-1:2004 CHIMNEYS - TEST METHODS FOR SYSTEM CHIMNEYS - PART 1: GENERAL TEST METHODS
    EN 14989-2:2007 Chimneys - Requirements and test methods for metal chimneys and material independent air supply ducts for roomsealed heating applications - Part 2: Flue and air supply ducts for room sealed appliances
    EN 29104 : 1993 MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - METHODS OF EVALUATING THE PERFORMANCE OF ELECTROMAGNETIC FLOW-METERS FOR LIQUIDS
    NF EN 13216-1 : 2005 CHIMNEYS - TEST METHODS FOR SYSTEM CHIMNEYS - PART 1: GENERAL TEST METHODS
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    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 2186:2007 Fluid flow in closed conduits — Connections for pressure signal transmissions between primary and secondary elements
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