High Presure Power washing, Cleaning hardened concrete from pipe.
Todd 08-31-2010
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I need to know who does high pressure power washing to clean out hardened concrete from pipe and material cylinders. Does anyone have any video of this being done? Pictures?

I heard that Putzmeister sells the pressure washers.

 
Todd 08-31-2010
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I just found this page http://www.dynajet.uk.com/index.php?page=xpipe&cat=pipes
pumper chuck 08-31-2010
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MPW out of ohio does it,and JBR enviromental services here in sc does it .JBR has done it for us with six thousand psi pressure. we drilled 1 118' pipe about half way through in 14 hours and took JBR 25 minutes to finish it plus another full pipe.its a little costly though around $200.00 per pipe.  
CDS 08-31-2010
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http://www.concretepumping.com/index.php?mode=newboard&act=topic&tid=7833

 
slow and easy 08-31-2010
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todd ive done this my self it works if it doesnt blow the liner out
highpressure 09-01-2010
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hello everyone, 350bar putz. after 6 hours dry time may be viable but will still take toooooo long. I have a 500bar dynajet 500th that puts you at 7,250psi, 8 gal. per minute, heated to 230 degrees. However, if you can't get to the pipe within 24hrs....give up, it will take normally take a high volume 10k or 20-40k to get it done. Have not seen a sincere demand for providing pipe cleanouts though.

Tom @ CF 09-02-2010
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Burst pressure on 7 gauge (non-hardened) boom tube is right at 3500 psi when new while heat treated single wall jumps to a burst pressure of just over 7000 psi when new.  I would strongly recommend staying well under these numbers too because the 148mm end is only rated for 1250 psi/ 85 bar WP (translating to a burst when new of just over 3700 psi) which will make that joint the weak link in the case of heat treated single wall boom pipe.  By the way, the socket head type of 'swivel' metric clamps are not any better than a snap coupling pressure-wise as they have a burst of right at 2500 psi. That, my friends, means this type of clamp rated 1250psi is at a 2:1 safety factor & this type of two-bolt does not have the same increase in pressure rating as the HD 2-bolt clamps used in high rise applications vs. HD snap couplings (and this is a common misunderstanding ‘out there in the trenches’). Pressure (whether it’s concrete, water, or air) at these numbers is deadly & nothing to play around with.

Tom J