FK 40 - Tri-Canada

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Pump technology terms NPSH value [m] NPSH value of the pump NPSH value of the plant Thus the calculated Reynolds number is: The Reynolds number exceeds the critical Reynolds number Re =2320. The flow is turbu- krit lent. NPSH is the abbreviation for Net Positive Suction Head Besides the flow rate Q and the pump head H, the NPSH value is one of the most important characteristic parameter of a centrifugal pump. The NPSH value of the pump depends on the design and speed of the pump. The higher the speed of the pump, the higher the NPSH value will be. The NPSH value is measured on a pump test stand and cannot be modified without supplement ary means. The NPSH value of the plant depends on the loss of head including the losses in fittings and apparatus in the line of the plant, and should be always checked by calculation. p = E pressure at the inlet cross section of the plant [bar] p = A pressure at t he out let cross section of t he plant [bar] p = D vapour pressure of the f luid at t he middle of t he suction connection of t he pump [bar] p = b air pressure at t he inst allation site of t he pump [bar] H = VS loss of head of t he suction line, f rom t he inlet cross section of the plant t o t he inlet cross section of t he pump [m] H = geodetic suction height (negative, in case of sgeo f looded suction) [m] ρ = density of the fluid [kg/m≈] v = E inlet flow velocity [m/s] NPSH = p + p - p ρ× g + v ≤ 2g E b D E + H - H sgeo VS
In order to ensure a correct operation of the pump the following condition must be given: NPSH plant > NPSH pump Boiling fluids with a velocity up to 0,3 m/s are a special case. In this case: p = p ; as E D vE 2g 2 NPSH plant = H sgeo and H VS become negligible resulting in: Pump technology terms
Page 2 and 3: Content Pump technology terms . . .
Page 4 and 5: Pump technology terms Flow rat e [m
Page 6 and 7: Pump technology terms Flow behaviou
Page 8 and 9: Pump technology terms Types of flow
Page 12 and 13: Loss of head calculation Loss of he
Page 14 and 15: Loss of head calculation Example: F
Page 16 and 17: Centrifugal pumps Feat ures of t he
Page 18 and 19: Centrifugal pumps Correction of the
Page 20 and 21: Centrifugal pumps Pumps connected i
Page 22 and 23: Centrifugal pumps Centrifugal pump
Page 24 and 25: Centrifugal pumps Centrifugal pump
Page 26 and 27: Centrifugal pumps Power consumption
Page 28 and 29: Centrifugal pumps Self- priming cen
Page 30 and 31: Centrifugal pumps Multistage centri
Page 32 and 33: Positive displacement pumps Perform
Page 34 and 35: Positive displacement pumps Selecti
Page 36 and 37: Positive displacement pumps Case 1:
Page 46 and 47: Positive displacement pumps Rotary
Page 58 and 59: Mechanical seal selection Double me
Page 60 and 61:
Mechanical seal selection “Face t
Page 62 and 63:
Mechanical seal selection Elastomer
Page 64 and 65:
Pump cleaning SIP After CIP cleanin
Page 66 and 67:
Index Cavitation . . . . . . . . .
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FK 40 - Tri-Canada

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