He said it was ok because you cant get a hose whip on a high rise job. Is that true?

If you are going respond please be nice. Have any of you ever seen a hose whipping on a high rise and why would high rise jobs be immune to hose whipping?

mmmm,hose whip is hose whip,pressure is pressure.If running line and someone kinks the hose,oh boy/girl.I have vivid memories of a job say 25 years ago,we were pumping using a straight leg (attached on outside wall).Something happend and they kinked the hose,when it let loose you could litterly here the rocks bounce off the 11th floor next door.

Perhaps this contractor just hasn't experienced catistopic failure yet,hope they don't either.

My Best

Oh,they said the hose did things a hindu snake charmer couldn't do.

I might go so far out there as to say that the eventuality is less. If/when it does happen the potential for complete disaster is far worse than doing a house foundation

I agree however I can't stop but think about a job in DC in the mid 90's.I believe they called it the piece of vacant land in the triangle,perhaps the Ronald Regan Library.They started out with a schwing 3000 (electric) and 42m PB.It was deemed later that not enough umphh and was replaced by a 8000 (electric).That machine could and did rip new 5" pipe/hose 1200' away.

It would be interesting to see what stories are around from the high rise work in the middle east using these high pressure pumps.

IF you never put the pump in reverse you would be ok.

Hose whip can absolutely happen on a high rise project! Hose whipping is caused by introduction of air into a pumping system, making hose whipping just as probable and definitely more severe on high rise projects!

Here is a thought,

How many of us operators have seen a hose man tossed like a rag doll from a hose whip?

Now for the Placing Boom Operators, how many times have you finished a slab right on the edge?

Scenario: 20th floor, 240 yard deck, started at 6am, its almost noon and your almost done! The last truck gets pumped out, you enjoy the view and sunshine for 10 minutes waiting on your clean-up load. Clean-up gets to the pump. Everybody ready,, pump on. Muds a coming,,, sounds good,, then  BOOM! Hose and boom explode upwards and out right towards the exhausted hose man that just happens to be standing between the hose and the edge of the slab. With nothing but a sad guardrail of 2x4's to protect him from falling, he crashes right through them!!!

I have never heard of or seen this happen,, but what if???

It is the same [only more pressure] as having your 60-whatever boomed straight up and pumping your ass off.

Could get real nightmare bad

Thanks joey,your a champ.

I wonder of the pump company owners that think that this cannot happen on a high-rise/placing boom job even know why they think that. What is it that insures that it won’t happen. Why are those jobs immune from hose whipping?

I personally feel that they are less likely to happen on a placing boom job. AND I know the reason.

Well why Bob?

it has happened to me. operator put a sponge in the line and didnt tell me. this was on prime. got my water out of the hose then nothing. i yell over the radio pump off cuz i knew we were pluged and as soon as i said pump off BOOM the sponge came out. the operator told me he put the sponge in the line for the prime so it wouldnt plug or rock pack with the slurry. that was dumb he could of killed someone. but when i am priming everyone is away from the hose i make sure!

my buddy pumped a go devil up 25 stories. someone put it in the line over night and he had no idea. again boom! out comes the go devil.

typesdubs 

It is because there are two people doing a two person job. Not just one as is typical with most booms regardless of size and job to be pumped.

As I said,hose whip is hose whip,pressure is pressure.The ones that seem to believe "absolute" on high rise work needs to rethink the real definition.

 Sorry Todd but this is bad info and this contractor was wrong!

 It's been a while but I used to run Schwing 32m and 39m detach placing booms and for almost 2 years did nothing but placing boom/high rise jobs every single solitary day. This was almost 10 years ago when there were more tower cranes in the Seattle area than any where in the country.

  Entrapped air is sometimes even more violent on placing-boom applications because the air pocket is compressed even more because of the vertical back pressure. It's not as bad with slab mud because it's wet. But with lower slump, high strength core wall mud it is worse.

  The only time I have ever drawn blood on a job was because of a hose whipping and it was on a high rise job! I heard the air pocket pass through the boom and I yelled at the hose man to let him know it was coming. He turned his head away from the hose, when the air came the 4.5" tip hose wipped him in the back and bashed his face into a sheer wall breaking his nose! I have also seen concrete blasted over the side of the building, I've seen it blast across a slab that was just floated and so on... All because of entrapped air that caused the tip hose to whip!!!

 Dont ask a contractor, Ask a hose man or a placing boom operator.    

 If hose whipping is less likely to occur on a placing-boom job it is simply because of the operator on the pump telling the operator up on the boom that there is air coming, and the proper actions were taken to reduce its effect.

TT,at a rate of say 90-100 yards per hour they may not notice with a 5" hose.I mean the surge may be managable but not really noticable.Your right,ask the hoseman of the risks.As I recall those 900's lost allot about #9 or #10,but these higher volume/pressure pumps are a killer.

i worked that job, i think. was the company b b?