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yes. Thanks a lot sir. Shout out to all for making this valuable. by the way, I am hoping to use this clamp to do Direct Pipe by substituting the HK thruster with my designed and fabricated thruster. we have a project of installing 50 inch pipe x 700 meters under a river. I dont have budgets...

i think the applicable length is short tube as the long tube length comes to be more than 18 m for the eq. to be valid.

sorry, re checked E/4 x t3/r3 x 1/(1-v2) where E if 210000 Mpa t is 17.78 mm v is 0.3 r is 638 mm answer is 1.26 Mpa for long tube. and 7.57 Mpa for short tube, (if the ends are held circular) have taken l = 2000 mm (my clamp length)

Hi desertfox, thanks for ponting to Roark book. I got the seventh edition Substituting my clamp values for dia 1270 and w.t. 0f 17.78 mm, the Q (Stress) = -1316 Mpa (-ve for external stress) for long tube and 7.5 Mpa for short tube. This must be the value of what this cyl will take max...

Ok. Thanks

That fancy bit is eluding me Does the elastic collapse or equation (in my latest post above) hold good?

Been working on the External collapse pressure of pipe and we get 2 equations with vastly different results. a) Lames equation for d/t<15 Pyp = 2 x Yp (d/t-1)/(d/t)^2 Substituting, Yp @ 60,000 psi D/t @ 74 (50"/0.7") = 1599.7 psi b) Elastic collapse for d/t > 25 Pe=46.95 x 10^6/(d/t x (d/t-1)^2...

Now to summarise: Yes, we are designing and fabricating a Pipe Thruster for HDD applications. We have done this for 3 pipes of 20" 24" and 36" and used them successfully. now we need to push a 50 inch pipe with a low w.t. of 0.7" where the d/t ratio is 71. Besides we need to design for a load...

and another onehttps://files.engineering.com/getfile.aspx?folder=113a7688-c0d2-4608-9be4-0d4141c9eb80&file=20''_THRUSTER_CLAMP_top.pdf

cant load multiple file and hence doing one at a time.https://files.engineering.com/getfile.aspx?folder=a660659f-b219-445b-9c85-8937800894d6&file=20''_THRUSTER_CLAMP_Front.pdf

Pl find attached the drawings of the clamp for 20 inch that we ahve fabricated and are using successfully.https://files.engineering.com/getfile.aspx?folder=5e8b592d-0434-4c9b-9f16-ba87a6766bdf&file=20''_THRUSTER_CLAMP_Front.pdf

this is the calc done my me for collapse pressure transferred from clamp to the pipe excel sheet attached. this calc passes the 20 inch pipe for 500 tons, but fails on the 50 inch pipe. But from what I was told by Harrenknecht, they are able to safely clamp the 56 inch pipe, X-52 with a wall...

Respected Engineers, I am overwhelmed by your responses. pl consider the following for understanding: a) This is my first ever post on Eng Tips and I shared a part of problem that I was stuck on. b) I do respond fairly quickly, the difference is the time zone, I am in India and we are 12 hr...

The clamp will grip the pipe evenly. all 360 degrees. The hinge is outside of the clamp and the inside is flush with pipe. The pipe clamping on top, with hinge being diametrically opposite, the moment will be f x d, f = 2250 tons and d is 1.27 m the thrust cylinder is right in center (750...

so I have say 10 Hyd cylinders on the top of the clamp with a TOTAL clamping force of 2300 tons and I have 2 cylinders on either side with a total Pushing force of 750 tons. My clamp has an ID of 1.27 meters and a length of 2 m. My clamp if clamping a pipe of : OD 1.27 m wall thickness of 17...

I am trying to calculate the combined stresses on a pipe clamp. 2 forces acting on it. a) the clamp is in 2 halves , the 2 halves connected with 10 hyd cylinders on top (12'o clock) exerting a closing force of 2000 tons b) another 2 cylinders connected at 9 o clock and 3 o clock exerting axial...