1. #1
    Unregistered

    Difference between Orifice and Venturi meter in terms of Pharmacy?

    hello
    Hi sir/madam what is the difference between orifice and venturi meter in terms of pharmacy?





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  3. #2
    VEENAMBRUTHA
    Join Date
    Jan 2012
    Posts
    829

    Re: Difference between Orifice and Venturi meter in terms of Pharmacy?

    Quote Originally Posted by Unregistered View Post
    hello
    Hi sir/madam what is the difference between orifice and venturi meter in terms of pharmacy?
    friend,,,
    DIFFERENCE BETWEEN ORIFICE AND VENTURI IN TERMS OF PHARMACY IS:



    [COLOR="rgb(85, 107, 47)"]The orifice plate can easily be changed to accomodate widely different flow rates, whereas the throat diameter of a venturi is fixed, so that its range of flow rates is circumscribed by the practical limits of Dp.[/COLOR]

    [COLOR="rgb(160, 82, 45)"]The orifice meter has a large permanent loss of pressure because of the presence of eddies on the downstream side of the orifice-plate;
    The shape of the venturi meter prevents the formation OS these eddies and greatly reduces the permanent loss.[/COLOR]

    [COLOR="rgb(85, 107, 47)"]The orifice is cheap and easy to install.
    The venturi meter is expensive, as it must be carefully proportioned and fabricated. [/COLOR]

    [COLOR="rgb(160, 82, 45)"]A home made orifice is often entirely satisfactory, whereas a venturi meter is practically always purchased from an instrument dealer.[/COLOR]

    [COLOR="rgb(85, 107, 47)"]On the other hand, the head lost in the orifice for the same conditions as in the venturi is many times greater. [/COLOR]

    [COLOR="rgb(160, 82, 45)"]The power lost is proportionally greater, and, when an orifice is inserted in a line carrying fluid continuously over long periods of time, the cost of the power may be out of all proportion to the saving in first cost.[/COLOR]

    [COLOR="rgb(85, 107, 47)"]Orifices are therefore best used for testing purposes or other cases where the power lost is not a factor, as in steam lines.[/COLOR]

    [COLOR="rgb(160, 82, 45)"]However, in spite of considerations of power loss, orifices are widely used, partly because of their greater flexibility, because installing a new orifice plate with a different opening is a simpler matter.[/COLOR]



    [COLOR="rgb(85, 107, 47)"]The venturi meter can not be so altered. Venturi meters are used only for permanent installations.[/COLOR]

    [COLOR="rgb(160, 82, 45)"]It should be noted that for a given pipe diameter and a given diameter of orifice opening or venturi throat, the reading of the venturi meter for a given velocity is to the reading of the orifice as (0.61/0.98)2, or 1:2.58.(i.e. orifice meter will show higher manometer reading for a given velocity than venturi meter).[/COLOR]
    thankyou !!!




  4. #3
    krishnasolanki
    Join Date
    Jan 2012
    Location
    jaipur
    Posts
    78

    Thumbs up Re: Difference between Orifice and Venturi meter in terms of Pharmacy?

    Orifice is:
    an opening or hole, especially one in the body, such as the mouth

    where as venturi is:
    a tube with a decrease in the inside diameter that is used to increase the flow velocity of the fluid and thereby cause a pressure drop; used to measure the flow velocity (a venturi meter) or to draw another fluid into the stream.

    thanks

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