Originally Posted by SkiprJohn
Is the extra cost of nitrile worth the expense? Does it last longer?
Not unless you plan on running something besides water
through your pump. Nitrile is for petro and chem's.
There are three reasons most people have to change an impeller.
1) It gets old and breaks up.
2) Someone forgets to open a valve and it burns up.
3) A line gets plugged and burns up.
And I believe #2 is most common! So it wouldn't make much difference in longevity.
BTW if the impeller burns up, most people forget to change the shaft seal
when they install a new impeller which actually calls for a disassembly. When the impeller gets hot so does the shaft and usually cooks the shaft seal
. It may not leak at first but it doesn't take long for that hard rubber to cut into the SS shaft. And when it leaks
it takes out the bearings.
I carry an extra shaft, bearings, seal and impeller just for Murphy.