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  • BS 1042-1.5(1987) : 1987

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    MEASUREMENTS OF FLUID FLOW IN CLOSED CONDUITS - GUIDE TO THE EFFECT OF DEPARTURE FROM THE STANDARD CONDITIONS SPECIFIED IN SECTION 1.1

    Available format(s):  Hardcopy, PDF

    Superseded date:  15-06-1997

    Language(s):  English

    Published date:  01-01-1987

    Publisher:  British Standards Institution

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

    Foreword
    Committees responsible
    Guide
    Section one. General
    0. Introduction
    1. Scope
    2. Symbols and definitions
    3. Effect of errors on flowrate calculations
    Section two. Effects of deviations in construction
    4. Orifice plate edge sharpness
    5. Thickness of orifice edge
    6. Flatness of upstream face
    7. Position of pressure tappings
    8. Condition of pressure tappings
    Section three. Effects of pipeline near the device
    9. Pipe diameter
    10. Steps and taper sections
    11. Diameter of carrier ring
    12. Undersize joint rings
    13. Protruding welds
    14. Eccentricity
    Section four. Effects of pipe layout
    15. General
    16. Discharge coefficient compensation
    17. Pressure tappings
    18. Devices for improving flow conditions
    Section five. Operational deviations
    19. General
    20. Buckling of an orifice plate
    21. Deposition on the upstream face of an orifice plate
    22. Deposition in the meter tube
    23. Deposition and the increase of surface roughness
         in venturi tubes
    24. Orifice plate edge squareness
    Section six. Pipe roughness
    25. General
    26. Upstream pipe
    27. Downstream pipe
    28. Reduction of roughness effects
    29. Maintenance
    Appendix
    A. Bibliography
    Tables
    1. Symbols
    2. Effect of taper pieces
    3. Percentage discharge coefficient changes when
         the straight pipe lengths before the orifice are
         less than specified in BS 1042: Section 1.1
    4. Formulae for additional uncertainty in the orifice
         discharge coefficient to be used with the
         percentage changes of table 3 for all tapping
         arrangements
    5. Effect of deposits on beta=0.2 and beta=0.7 orifice
         plates
    6. Recommendations regarding extent of cleaning
    Figures
    1. Carrier having internal diameter D1 less than pipe
         diameter D
    2. Effect of incorrect carrier diameter
    3. Possible orifice plate eccentricity resulting
         from specified tolerances on bolt hole, bolt hole
         pitch circle, pipe o.d. and flange bore
    4. Discharge coefficient error vs eccentricity for an
         orifice plate with D,D/2 and flange taps
    5. Triple-T connection arrangement
    6. Flow straightener installation
    7. Effect of a Zander straightener on the
         measurement error
    8. Flow straighteners
    9. Effect of orifice plate buckling on flow
         measurement accuracy
    10. Effect of welding rods in meter tube
    11. Effect of debris in meter tube (on both sides
         of plate)
    12. Variation of venturi meter coefficient with
         surface roughness
    13. The combined effect of abnormal roughness and
         diminution in pipe bore on orifice plates
         with corner tappings for all pipe sizes larger
         than 75 mm
    14. The effect of abnormal roughness on orifice plates
         with corner tappings for all pipe sizes larger
         than 75 mm

    Abstract - (Show below) - (Hide below)

    Gives guidance to assist in estimating the flowrate when using pressure differential devices constructed or operated outside the scope of BS 1042 : Section 1.1. It should not be implied that additional tolerances or corrections can necessarily compensate for the effects of deviating from the standard. The information is given, in the first place, to indicate the degree of care necessary in the manufacture, installation and maintenance of pressure difference devices and in the second place, to permit those users who may not be able to comply fully with the requirements to assess, however roughly, the magnitude and direction of the resulting errors.

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

    Committee PCL/2
    Development Note Supersedes BS 1042:PT3(1965)
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Superseded By
    Supersedes

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

    BS 3156-5:1969 ANALYSIS OF FUEL GASES - TECHNIQUES FOR HIGH PRESSURE GASES
    BS 4773-1(1971) : 1971 METHODS FOR TESTING AND RATING AIR TERMINAL DEVICES FOR AIR DISTRIBUTION SYSTEMS - AERODYNAMIC TESTING
    BS 3554-2:1972 SPECIFICATION FOR GAS GOVERNORS - INDEPENDENT GOVERNORS FOR INLET PRESSURES UP TO 350 MBAR
    BS 848-1(1980) : 1980 FANS FOR GENERAL PURPOSES - METHODS OF TESTING PERFORMANCE
    BS 4979-1(1973) : AMD 1795
    BS 5384(1977) : LATEST GUIDE TO THE SELECTION AND USE OF CONTROL SYSTEMS FOR HEATING, VENTILATING AND AIR CONDITIONING INSTALLATIONS
    BS 3135(1975) : LATEST SPECIFICATION FOR GAS TURBINES: ACCEPTANCE TESTS
    BS 5491(1977) : 1977 SPECIFICATION FOR RATING AND TESTING UNIT AIR CONDITIONERS OF ABOVE 7 KW COOLING CAPACITY
    BS 6540-1(1985) : 1985 AIR FILTERS USED IN AIR CONDITIONING AND GENERAL VENTILATION - METHODS OF TEST FOR ATMOSPHERIC DUST SPOT EFFICIENCY AND SYNTHETIC DUST WEIGHT ARRESTANCE
    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 5968(1980) : 1980 METHODS OF ACCEPTANCE TESTING OF INDUSTRIAL TYPE STEAM TURBINES
    BS 6316(1983) : 1983 CODE OF PRACTICE FOR TEST PUMPING WATER WELLS
    BS 752(1974) : 1974 TEST CODE FOR ACCEPTANCE OF STEAM TURBINES
    BS 3986-1(1998) : 1998 METHODS OF TEST FOR DRYING PERFORMANCE OF AGRICULTURAL GRAIN DRYERS - GENERAL PROCEDURES AND LIMITED REQUIREMENTS FOR WHEAT

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

    BS 1042-1.1(1981) : 1981 MEASUREMENT OF FLUID FLOW IN CLOSED CONDUITS - SPECIFICATION FOR SQUARE-EDGED ORIFICE PLATES, NOZZLES AND VENTURI TUBES INSERTED IN CIRCULAR CROSS SECTION CONDUITS RUNNING FULL
    BS 1042-2.1(1983) : 1983 MEASUREMENT OF FLUID IN CLOSED CONDUITS - VELOCITY AREA METHODS - METHODS USING PITOT STATIC TUBES
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