Computer modelling has shown that such a high pressure region can originate from the motions of the gas at the edge of a gas hole
- just like the one found in this disc.
Placement and the size of the gas hole
were critical, as well as how and where that gas was directed.
This hole is in the bottom of the base under the sling attachment and was drilled to allow the gas hole
to be drilled when manufactured.
Much of the analysis which has been published to date has been concerned with a constant gas hole
rather than variable gas distributor effects.
Tenders are invited for Tool Cleaning Gas Hole
Pigeon, MI, was experiencing gas hole
and pock mark defects on the surface of some of its castings.
A gas hole
forms when the gas pressure, at any point, exceeds the head pressure and is influenced by the mold's ability to release the gases generated in the mold (permeability).
noted that the presence of Al in cast iron can cause serious gas hole
defects in castings.
Manufacture: Castings shall be of uniform quality, free from sand holes, gas holes
, shrinkage, cracks and other surface defects.
Common defects encountered in permanent mold castings, such as dross and associated gas holes
, blow holes, pinhole porosity, misruns, cold shuts and cracks, are similar to those experienced in other processes, but the approach to eliminating these defects can be different.
RPS Group was commissioned by Eden Energy to analyse drill cores from previous oil and gas holes
from the 1970s, thousands of feet underground in the region's Namurian shale.
These included known geological data, drill logs and drill cores from previous oil and gas holes
that intersected the Namurian shales, and coal mining surveys and data that is publicly available from the huge data base generated by the coal mining industry.