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  • BS 1042-2.3(1984) : 1984

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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 - METHODS OF FLOW MEASUREMENT IN SWIRLING OR ASYMMETRIC FLOW CONDITIONS IN CIRCULAR DUCTS BY MEANS OF CURRENT-METERS OR PITOT STATIC TUBES

    Available format(s):  Hardcopy, PDF

    Superseded date:  31-08-2008

    Language(s):  English

    Published date:  01-01-1984

    Publisher:  British Standards Institution

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

    National foreword
    Committees responsible
    Methods
    0. Introduction
    1. Scope and field of application
    2. References
    3. Symbols
    4. Principle
    5. Choice of measuring plane
    6. Devices for improving flow conditions
    7. Measurement of local velocities
    8. Determination of mean flow velocity
    9. Accuracy of flow-rate estimation
    Annexes
    A. Detection and removal of regular pressure
         fluctuations
    B. Damping of manometers
    C. Calculation of Pitot static tube locations for
         method B
    D. Corrections to be applied when a Pitot static tube
         is used
    E. Corrections to be applied when a current-meter is
         used
    F. Errors due to non-axisymmetrical velocity
         distribution
    Figures
    1. Installation of straightener
    2. Type A - Zanker straightener
    3. Type B - Sprenkle straightener
    4. Type C - Tube bundle straightener
    5. Type D - AMCA straightener
    6. type E - Etoile straightener
    7. Wedge-shaped yaw probe
    8. Cylindrical yaw probe
    9. k psi versus psi for typical Pitot static tubes
    10. Maximum permissible size of Pitot static tube
         in method B
    11. Examples of directional response of different
         types of current-meters
    12. Non-return valve
    13. Arrangement of non-return valves
    14. Device for checking damping of pressure
         fluctuations in the leads to the manometer
    15. Radial positions of Pitot static tube in swirling
         flow when method B is used
    16. Pitot static tube
    17. Example of the effect of axial pulsations on
         current meter velocity estimation
    18. Example of the effect of tangential pulsations on
         current meter velocity estimation

    Abstract - (Show below) - (Hide below)

    Describes velocity area methods for measuring flow in swirling or asymmetric flow conditions in circular ducts by means of current meters or Pitot static tubes. Specifies the measurements required, the precautions to be taken, the corrections to apply and describes the additional uncertainties which are introduced when a measurement in asymmetric or swirling flow has to be made. Although methods of using velocity area integration techniques to measure flow rate under conditions where there is swirl and/or asymmetry in the flow are described, every effort should nevertheless be made to choose a measuring section in the pipe where the swirl or asymmetry is as small as possible. Only flows with a negligible radial component are considered.

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

    Committee CPI/30
    Development Note Supersedes BS 1042-2(1964) (07/2004) Supersedes 82/25605 DC. (06/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By
    Supersedes

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

    BS 4773-1(1971) : 1971 METHODS FOR TESTING AND RATING AIR TERMINAL DEVICES FOR AIR DISTRIBUTION SYSTEMS - AERODYNAMIC TESTING
    BS 848-1(1980) : 1980 FANS FOR GENERAL PURPOSES - METHODS OF TESTING PERFORMANCE
    BS 4979-1(1973) : AMD 1795
    BS 1042-2.4(1989) : 1989 MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - VELOCITY AREA METHODS - METHOD OF MEASUREMENT OF CLEAN WATER FLOW USING CURRENT METERS IN FULL CONDUITS AND UNDER REGULAR FLOW CONDITIONS
    BS 5991(1983) : 1983 SPECIFICATION FOR INDIRECT GAS FIRED FORCED CONVECTION AIR HEATERS FOR SPACE HEATING (60 KW UP TO 2 MW INPUT) SAFETY & PERFORMANCE REQUIREMENTS (EXCLUDING ELECTRICAL REQUIREMENTS) 2ND FAMILY GASES
    BS 893(1978) : 1978 METHOD FOR THE MEASUREMENT OF THE CONCENTRATION OF PARTICULATE MATERIAL IN DUCTS CARRYING GASES
    BS 4876:1984 SPECIFICATION FOR PERFORMANCE REQUIREMENTS FOR DOMESTIC FLUED OIL BURNING APPLIANCES (INCLUDING TEST PROCEDURES)
    BS 599(1966) : 1966 METHODS OF TESTING PUMPS
    BS 3986(1991) : 1991 AMD 9836 METHODS OF TEST FOR DRYING PERFORMANCE OF AGRICULTURAL GRAIN DRYERS - GENERAL PROCEDURES AND LIMITED REQUIREMENTS FOR WHEAT
    BS 5990(1981) : AMD 5639 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 6199-1.2(1991) : 1991 MEASUREMENT OF LIQUID FLOW IN CLOSED CONDUITS USING WEIGHING AND VOLUMETRIC METHODS - WEIGHING METHOD - PROCEDURES FOR CHECKING STATIC WEIGHING SYSTEMS
    BS 3986-1(1998) : 1998 METHODS OF TEST FOR DRYING PERFORMANCE OF AGRICULTURAL GRAIN DRYERS - GENERAL PROCEDURES AND LIMITED REQUIREMENTS FOR WHEAT
    BS EN ISO 6817 : 1997 MEASUREMENT OF CONDUCTIVE LIQUID FLOW IN CLOSED CONDUITS - METHOD USING ELECTROMAGNETIC FLOWMETERS
    BS 893:1978 METHOD FOR THE MEASUREMENT OF THE CONCENTRATION OF PARTICULATE MATERIAL IN DUCTS CARRYING GASES

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

    ISO 3354:2008 Measurement of clean water flow in closed conduits Velocity-area method using current-meters in full conduits and under regular flow conditions
    BS 3680-8C(1980) : 1980 MEASUREMENT OF LIQUID FLOW IN OPEN CHANNELS - MEASURING INSTRUMENTS AND EQUIPMENT - CALIBRATION OF ROTATING-ELEMENT CURRENT-METERS IN STRAIGHT OPEN TANKS
    ISO 3313 : 1992 MEASUREMENT OF PULSATING FLUID FLOW IN A PIPE BY MEANS OF ORIFICE PLATES, NOZZLES OR VENTURI TUBES, IN PARTICULAR IN THE CASE OF SINUSOIDAL OR SQUARE WAVE INTERMITTENT PERIODIC TYPE FLUCTUATIONS
    BS 5875(1991) : 91 AMD 7978 GLOSSARY OF TERMS AND SYMBOLS FOR MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS
    BS 1042-2.1(1983) : 1983 MEASUREMENT OF FLUID IN CLOSED CONDUITS - VELOCITY AREA METHODS - METHODS USING PITOT STATIC TUBES
    BS 5844(1980) : 1980 METHODS OF MEASUREMENT OF FLUID FLOW - ESTIMATION OF UNCERTAINTY OF A FLOW RATE MEASUREMENT
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