DTH is short for “down-the-hole”. Since the DTH method was originally developed to drill large-diameter holes downwards in surface-drilling applications, its name originated from the fact that the percussion mechanism followed the bit down into the hole. Applications were later found for the DTH method underground, where the direction of drilling is generally upwards instead of downwards. [pdf]
Dry screw vacuum pumps require no water or oil for sealing or lubrication in the vacuum stages. Consequently, these dry vacuum systems eliminate effluent generation, pollution,. .
VSB dry screw models operate at any pressure between blank of and atmospheric pressure. Pumping capacities are virtually limitless when paired with a high vacuum booster pump. .
The VSB Series low rotational speed ensures smooth and robust operation. Engineered to offer higher discharge pressure handling capabilities than vertical designs, allowing for more process time. With higher vapor and liquid tolerances, dry screw vacuum. [pdf]
The first offshore mobile drilling platform was the Breton Rig 20, first operated in 1949. This rig had evolved from the inland drilling barges which were used to drill in marshes and protected waters in up to 10 feet of water. The Breton Rig 20 was 160 feet by 85 feet, and could work in 20 feet water depth. [pdf]
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