Security recommended in Horizontal Directional Drilling.
Security recommended in Horizontal Directional Drilling.
(OP)
Good Afternoon.
I have a question.
We need to make a crossing for the Horizontal Directional Drilling method, but for design of the curvature radius.
What is the factor of security recommended?.
I hope your help.
Thanks
P.S. The standard for construccion is ASME B31.4.
I have a question.
We need to make a crossing for the Horizontal Directional Drilling method, but for design of the curvature radius.
What is the factor of security recommended?.
I hope your help.
Thanks
P.S. The standard for construccion is ASME B31.4.





RE: Security recommended in Horizontal Directional Drilling.
In my experience the start point for a minimum radius is 600D of the pipe to avoid excessive force on the side of the hole leading to potential for lock up and high pull forces. However what is the actual minimum I don't know, maybe 500D if you really need to for short drills, only that HDD is not normally an exact science in that respect as ground conditions can vary so much as well as length, diamter, outer coating. You also need to check the overall stress levels as the bending force starts to become quite large at 600D and less.
If you mean design in terms of factor of design, most people go for a conservative approach and use 0.6 DF. any corrosion internal or external cannot be repaired and hence you need a bit more 2meat" on your wall thickness. Also as noted above, overall stress levels can be quite high due to the permanent bending moment.
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Also: There's usually a good reason why everyone does it that way
RE: Security recommended in Horizontal Directional Drilling.
RE: Security recommended in Horizontal Directional Drilling.