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    Disclosure to Promote the Right To Information

    Whereas the Parliament of India has set out to provide a practical regime of right to

    information for citizens to secure access to information under the control of public authorities,in order to promote transparency and accountability in the working of every public authority,and whereas the attached publication of the Bureau of Indian Standards is of particular interestto the public, particularly disadvantaged communities and those engaged in the pursuit ofeducation and knowledge, the attached public safety standard is made available to promote thetimely dissemination of this information in an accurate manner to the public.

    !"#$% '(%)

    !"# $ %& #' (")* &" +#,-. Satyanarayan Gangaram Pitroda

    Invent a New India Using Knowledge

    /0 )"1 &2 324 #' 5 *)6 Jawaharlal Nehru

    Step Out From the Old to the New

    7"#1 &" 8+9&") , 7:1 &" 8+9&") Mazdoor Kisan Shakti Sangathan

    The Right to Information, The Right to Live

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    IS 1710 : 1989

    4.12.5 Bowl Assembly Heads ( h )It is th e ene rgy imparl ed to the liquid by the p ump

    bow l ass embly, expr essed in met res of liquid. It isthe head developed at the discharge connection of the

    bowl ass embly and is an integral mul tip le of the headper stage depe ndin g on the numbe r of stages in the

    bowl assembly. Th e head developed by the bowlassemb ly is equal to effective head plus friction loss inthe column assembly, discharge head loss and suctionloss that is,

    4.13 Net Positive Suction Head (NPSH)Not positive suction head (h) availa ble is the totalsuction head of liquid in metre s absolut e, determ ine atimpeller eye, less the vapo ur press ure of the liquid inmetres absolute. Thus

    wh er e= total suction head in metres absolute

    = h a h e (plus sign applies to suction headand minus sign applies to suction lift), and

    = local atmospheric pressure in metres abso-lute.

    It is necess ary to differentiate between available andrequired NPSH The available NPSH is a char acte rstic of the system in which the pump works and is thedifference between existin g absolute suction headand vapour pressure at prevailing temperature. The

    required NPSH is a function of pump design andrepresents the minimum required margin between thesuction head and the vapour pressure at a givencapacity.

    4.14 Specific Speed4.14.1 Specific speed is a term used for classifyingpumps on the basis of their performance anddimensional proportion regardless of their actual sizeor the speed at which they oper ate. It is the speedexpressed in revolutions per minute of an imaginarypump geometrically similar in every respect to thepump under consideration and capable of raising 75 kgof water par second to a height of one metre.

    4.14.2 Mathematically specific speed is given by:

    wh er e

    sq = the specific speed in revolutions per minute.n = the speed in revolutions per minute,Q = the disch arge in cubic metres per second of a

    single suction impeller, and

    H = the total head per stage in metres.

    If the disch arge is expres sed in lit res per mi nute, theexpression for specific speed is written a s :

    4.15 Loss

    4.15.1 Suction Loss ( h s )

    The loss of head in strainer and suction pipe attached below bowl asse mbly . When a straine r is not fitted.then suction bell entry losses shal l be includ ed.

    4.15.2 Column Loss ( h c )It is the value of the head loss expressed in metrescaused by the (low friction in the column pipe assem-

    bly .

    4.15.3 Discharge Head ( h d )It is a frictional loss head in metres in dis charge headassembly.

    4.15.4 Line Shaft Loss (P a)It is the power expresse d in kW required due to therotation friction of the line shaft in its bearing at thespecified speed. This value is added to the bowlassembly input to predict the pump input.

    4.15.5 Thrust Bearing Loss ( P t )The power in kilowatt absorbed by the thrust bearingdue to hydraul ic axial thrust includin g weight ofrotating assembly.

    4.16 Input Power

    4.16.1 Bowl Assembly Input Power ( P b )

    The power in kilowatt delivered to the impeller shaft.

    4.16.2 Pump Input Power ( P ).

    It is the power express ed in kW delivered to the headshaft (lop shaft) by the d river. It is equal to the bowlassembl y input plus lino shaft loss and thrust bearingloss.

    P = P b + P s + P i

    = P i ! m

    wh er e

    m = efficiency of moto r.

    4.16.3 Driver Input Power ( P 1 )

    It is the power in kilowatt applied to the driver.

    4.17 Output Power

    4.17.1 Bowl Assembly Output ( P b )

    The power in kilowatts delivered by the bowlassembly. It is express ed as :

    3

    H = h + h s + h c + h d

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    F E D

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