I have noticed that some of Putzmeister Booms have some short radius bends like the one below (I believe 180mm radius):

Does anyone here have any experiences with these, specifically do they occassionally plug up? do they clean well? do they last well on the boom?

I have 2 on the 42-5 that i run. i don't notice any difference pumping or plugging up with these short radius. the only down side is that there is only 2 and i have no spare short radius elbows right now if something were to happen (shouldn't blow though, 1 year old Esser pipe with maybe 4000m thru).

we have them on a 43 meter and cause no issues at all .

53 metre sermac has them too, never cause any issues