balancing drum and balancing disk
balancing drum and balancing disk
(OP)
On a turbine driven boiler feed pump what is the function of a balancing drum with a balancing disk? on prints it shows a balancing drum leak off line that goes back to the pumps suction...
can anyone provide some expertise?
can anyone provide some expertise?





RE: balancing drum and balancing disk
But axial split cases tend to have an upper pressure limit. At very high pressures, barrel pumps are used since they can handle the very high pressures better. With a barrel pump, it is much more difficult to find a good way to direct the flow path through a set of opposed impellers. So instead, they point all the impellers in the same direction and use a balance disk or drum on the end. The balance disk is just after the last stage so it has full discharge pressure on one side. A line is routed from the other side of the balance disk back to the suction. The size of the drum is made so that it provides almost as much net thrust as all the impellers combined. Area times pressure difference between suction and discharge equals thrust force. Since there is a very high pressure differential across the balance disk/drum, it is critical that the clearances are correct or else excessive flow will be diverted back to suction and the thrust balancing force will be lost. In other words, if the balance drum/disk fails, a thrust bearing failure is likely to follow.
The difference between a balance disk and a balance drum is whether the primary pressure drop is taken across a radial clearance (drum) or an axial face (disk). Some pumps use a combination drum/disk that incorporates both radial and axial
RE: balancing drum and balancing disk
RE: balancing drum and balancing disk
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: balancing drum and balancing disk
That is surely the most coherent explanation of these devices that I have ever seen.
RE: balancing drum and balancing disk
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: balancing drum and balancing disk
JCP, have you considered making this an FAQ?
rmw
RE: balancing drum and balancing disk