Modify Shelby Tube?
Modify Shelby Tube?
(OP)
My question is what are the advantages and disadvantages for using a modify shelby tube (Lug Barrel - a shelby tube with drilling bits welded to the outside of the shelby tube) compared to a standard shelby tube?
The reason I was told drillers use this is save time from trips in and out of the boring hole. This modify tube allows them to drill during a rotary wash setup and then push the tube on the same trip.
Any suggestions or opinions on this would be appreciated.
The reason I was told drillers use this is save time from trips in and out of the boring hole. This modify tube allows them to drill during a rotary wash setup and then push the tube on the same trip.
Any suggestions or opinions on this would be appreciated.





RE: Modify Shelby Tube?
RE: Modify Shelby Tube?
The modify tube has six inch lugs/teeth welded about 120 degrees apart from one another around the bottom of the barrel. The lugs/teeth stick passed the bottom of the tube approxiamately 1 to 2 inches.
I was told the process goes as follows. The driller would attach the modify tube and begin drilling to the desired depth, lets say the desired sample interval is 48' to 50'. The driller would rotary wash down to 48' using the lugs/teeth to drill away the soil. Then the driller would wait til the soil cuttings were washed up the boring hole and then the driller would cut the pump off to stop the water flow. The driller would then push the tube down to 50' and gain the desired sample. I was told, by drillers, that you can not tell the difference in the sample.
RE: Modify Shelby Tube?
RE: Modify Shelby Tube?
RE: Modify Shelby Tube?