multiple pipes and tail -f

Hi,
I have been trying to do the following but it doesn't seem to work.
tail -f <filename> | grep <some string> | grep <some other string>

where <filename> is the name of any file to which new lines are added,
something like a log file for example.
Is there some restriction on the number of pipes which could be used
while using tail -f ?
I would like use sed instead of the last grep in the example above,
but for simplicity I have used second grep.

Thanks and Regards,
Prashant

.

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