RE: [Man.Distr]Re: Plane of the pump shaft

From: <Sajit>
Date: Tue Jan 06 2004 - 08:59:00 EST


George,

This one is on a table that lists, what should be the upstream dimension to prevent cavitation. I had to eliminate the other options to arrive at 4D distance.

Sajit

TYPE OF PUMP<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

POSITION OF SUCTION PIPING MINIMUM STRAIGHT LENGTH Vertical close-coupled

in same plane as pump shaft

1.5 D *

perpendicular to pump shaft

4 D

Single suction,
end suction type

not applicable

4 D

Single suction,
top-top connection

at top of pump

4 D

in same plane as pump shaft

1.5 D

Double suction

perpendicular to pump shaft (preferred situation)

3 D

any position other than perpendicular **

5 D to 10 D

-----Original Message-----
From: George McKinney [mailto:gmckinney@augustaeng.com] Sent: Monday, January 05, 2004 5:39 PM
To: <a href="/group/PipingDesign/post?postID=Q3fT1Nvq-fc8DOLTXSg6h-PaiwD609Sdl2Ryhh3YBJQtj92bC-WQ4Oz70uQQ6vG_a3M1ee1sClCH1Elf57a5WBQj4K0mZw">PipingDesign@yahoogroups.com</a> Subject: [Man.Distr]Re: [PipingDesign] Plane of the pump shaft

Sajit:
I believe what they are asking is whether the pump is an axial inlet design (in plane of pump shaft) or a radial inlet design, perpindicular to the pump shaft. This would be of importance in checking effect of thermal growth on the lines, as it would tend to move the pump/affect alignment. This would also have impact on vibrations being transmitted from the pump into the line, as axial vibration is usually lower than radial.

George McKinney

   What does the following phrases mean. Suction piping is 1. In same plane as pump shaft. 2. Perpendicular to the pump shaft. Which is this plane? for a split casing multi stage centrifugal pump.

   Sajit


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Received on Tue Jan 06 08:59:00 2004

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