FK 40 - Tri-Canada

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Mechanical seal selection Double mechanical seals The spring is in the product. The product pressure acts additional to the spring on the rotating seal part. Therefore standard mechanical seals are used only for a pressure up to 10 bar. For higher pressures, balanced mechanical seals are used. In this case two mechanical seals are arranged in series. The inboard or, “primary seal” keeps the product in the pump housing. The outboard or, “secondary seal” prevents leakage of the flush liquid into the atmoshere. The double mechanical seals can be provided by Frist am in two different arrangements: • Back to Back • Face to Face These mechanical seal arrangement s are used, • if a fluid product leakage needs to be avoided, • when aggressive media are used or at high pressures and t emperat ures, • for many polymerising, sticky media and media which tend to sedimentation, • for vacuum applications.
Two rotating seal rings are arranged facing away from each other “Back to Back”. The lubricating film is generated by the barrier fluid. The barrier pressure in the case of a “Back to Back” arrangement should be 1.5 up to 2.0 bar above the product pressure in the seal area. Stationary Rotating ring Stationary ring ring Spring Mechanical seals with a “Back to Back” arrangement are mainly used in the chemical industry. In case of a leakage, the barrier liquid penetrates the product. Mechanical seal selection “Back to Back” arrangement
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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 10 and 11: Pump technology terms NPSH value [m
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 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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