1710_Pumps_VT_IS Specification

8/12/2019 1710_Pumps_VT_IS Specification

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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 interest

to the public, particularly disadvantaged communities and those engaged in the pursuit of

education and knowledge, the attached public safety standard is made available to promote the

timely dissemination of this information in an accurate manner to the public.

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

Invent a New India Using Knowledge

/0)"1 &2 324 #' 5 *)6Jawaharlal 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 the energy imparled to the liquid by the p ump

bow l assembly, expr essed in metres of liquid. It is

the head developed at the discharge connection of the

bowl ass embly and is an integral multip le of the head

per stage dependin g on the number of stages in the

bowl assembly. The head developed by the bowl

assemb ly is equal to effective head plus friction loss in

the column assembly, discharge head loss and suction

loss that is,

4.13 Net Positive Suction Head (NPSH)

Not positive suction head (h) available is the total

suction head of liquid in metres absolute, determine at

impeller eye, less the vapour pressure of the liquid in

metres absolute. Thus

wh er e

= total suction head in metres absolute

=ha h

e (plus sign applies to suction head

and minus sign applies to suction lift), and

= local atmospheric pressure in metres abso-

lute.

It is necessary to differentiate between available and

required NPSH The available NPSH is a char acte rs

tic of the system in which the pump works and is the

difference between existin g absolute suction head

and vapour pressure at prevailing temperature. The

required NPSH is a function of pump design andrepresents the minimum required margin between the

suction head and the vapour pressure at a given

capacity.

4.14 Specific Speed

4.14.1 Specific speed is a term used for classifying

pumps on the basis of their performance and

dimensional proportion regardless of their actual size

or the speed at which they oper ate. It is the speed

expressed in revolutions per minute of an imaginary

pump geometrically similar in every respect to the

pump under consideration and capable of raising 75 kg

of 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 discharge in cubic metres per second of a

single suction impeller, and

H = the total head per stage in metres.

If the disch arge is expressed in lit res per mi nute, the

expression for specific speed is written a s :

4.15 Loss

4.15.1 Suction Loss ( hs )

The loss of head in strainer and suction pipe attached

below bowl assembly. When a strainer is not fitted.

then suction bell entry losses shal l be included.

4.15.2 Column Loss ( hc )

It is the value of the head loss expressed in metres

caused by the (low friction in the column pipe assem-

bly .

4.15.3 Discharge Head ( hd )

It is a frictional loss head in metres in dis charge head

assembly.

4.15.4 Line Shaft Loss (Pa)

It is the power expressed in kW required due to the

rotation friction of the line shaft in its bearing at the

specified speed. This value is added to the bowl

assembly input to predict the pump input.

4.15.5 Thrust Bearing Loss ( Pt )

The power in kilowatt absorbed by the thrust bearing

due to hydraul ic axial thrust includin g weight of

rotating assembly.

4.16 Input Power

4.16.1 Bowl Assembly Input Power ( Pb )

The power in kilowatt delivered to the impeller shaft.

4.16.2 Pump Input Power ( P ).

It is the power expressed in kW delivered to the head

shaft (lop shaft) by the driver. It is equal to the bowl

assembly input plus lino shaft loss and thrust bearing

loss.

P=Pb+P

s+P

i

= Pi!mwher e

m = efficiency of motor.

4.16.3 Driver Input Power ( P1 )

It is the power in kilowatt applied to the driver.

4.17 Output Power

4.17.1 Bowl Assembly Output ( Pb )

The power in kilowatts delivered by the bowl

assembly. It is expressed as :

3

H = h + hs + h

c + h

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1710_Pumps_VT_IS Specification