"We were able to fabricate the entire length of bore
before installation because of the flexibility of PA 12 pipe," Yeater said.
This alternative uses g-functions to determine the design length of bore
But today, ammunition manufacturers employ advanced propellants that allow much faster ignition at much lower pressures than previously, so that bullets get up to their specced velocities in less length of bore
with less pressure and more consistent propellant burn than was formerly the case.
* Length Of Bore
. New records are continually being broken for length of directional drilling bores for various pipeline diameters because of advances in drill rig and drill tool technology, but there are limits.
To successfully complete longer bores, Dolan says contractors must ensure they have the correct size of HDD machine for the length of bore
they will be drilling and the size of pipe they'll be installing.
"As the pipeline work in the Haynesville Shale has increased, so has the size of pipe and length of bores
," said Smith.
Average length of bores
for the mains is from 450 to 500 feet at an average depth of 36 inches.