Quick question,

I worked on a high rise two years ago for about six months. The position of the placing boom meant we had to add 5 hoses every time we poured one half of the building (about 60cy of it was through hoses until the boom was airborne for the rest). Anyways, the "pump master" there would not let us reduce it down to 4" hoses stating the pressure would be too much for the pump.  Topped out about 28 stories.  What are your thoughts on this?

Will there be a test?

Good info Speedy (as usual)

Will the concrete pump through a 4" hose?

Ahhh DT the good old days.The 4"-5" straight legs bolted to the side of building,least not forget the "vic" clamps.

Many,

I remember the old "Concrete Pumping Inc. days (before the namme change).

The questions you asked yourself before you left for the job. #1. Do you have your rope? (the 100 ft rope you used to pull-up the pipes&hoses to the floor you were pumping #2 Do you have enough chains and binders (to secure the 1 day vertical standpipe) to the building after assembly on the ground #3 Do you have a bottom and top elbow (4" galvanized sched40 24"radiuselbow with rebar welded to it for rests.

I can not even imagine anyone doing that today ;~) 

NON ADJUSTABLE VIC CLAMPS

at least the pumps did not have enough piston-face pressure to blow the (good) clamps apart... 650psi

Was that primative or primevil times,and we lived good to boot.CPI,gone forever.To think that man was a driving force in this industry,look at him now.I may not sleep tonite thinking of all that stuff brought back to the yard,wow.

Hey Bob; You forgot one!! Were your boom hoses gonna take all that pressure!!

The hoses were a major joke. I always thought that they were protected by the even worse clamps.

The pumping hose industry sure has come a long way. The new stuff is very good.