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Do you have any experiance about the differnce between seamless and welded pipes? I have heard that the seamless is stronger even though it has the same mechanical properties as the welded type.

born2drill, that´s interesing. We normally work with YP around 460 mpa so I hope it does´nt effect us. SEshore, Thanks. So the reason why you don´t weld on the construcion site is becouse it´s time consuming? In Scandinavia we use Symmetrix drilling mostly. What type do you use? Do you...

Hi SEshore, Ok, but do you need 100% in compression and/or tensile load? By the way, I´m looking for a thread which is 100% in all three (Bend, tensile, compression). Do you know which types are used?

About % bending capacity. Why don´t pilers weld on stronger sleevs like the do on drill pipes? I can´t see the point if you can only use 50 % of the pipes capacity.

Yes, but it would be great to know which one of them.

Erdbau, Im looking for the threads only. Is there a standard used by pilers or do you take oil pipe threads or similar? /Mrturran

I´m looking for different types of threads used for micropiles. Which ones are used? Is there a way to get them? Is it all API? Thanks!

Hi Pete, Thanks very much. The API-thread is of some reason standard for this piling application. Yes, please provide me with names if you have. We need to thread it on a exsisting pipe and can´t weld a pieace on becouse of the application. Do you know about this process, to make a thread...

I intend to put an API-thread on a massive steel core. The application is piling. Does anyone know which type of machine is used? (oil country lathe?) It´s the same thread that is used on oil pipes (one internal and one external). The steel bar is 8 meter long and have dimensions from 80 mm up...