Reverse-circulation drilling, an improved tool for production wells and exploratory holes /

Mode of access: Internet.

Unit, direct support, and general support maintenance repair parts and special tools lists : drill, pneumatic, drifter, boom-type, crawler-mounted, self-propelled (NSN 3820-00-445-3766), Joy model RAM-MS-5/450A-DR.

"May 1992."

Operator and organizational maintenance manual : drill, pneumatic, drifter, self-propelled, Joy model RAM-MS-5/450A-DR, FSN 3820-445-3766.

"July 1974."

Organizational, direct support and general support maintenance repair parts and special tools lists : drill, pneumatic, drifter, boom-type, crawler-mounted, self-propelled NSN 3820-00-445-3766, Joy model RAM-MS-5/450A-DR.

Includes indexes.

Operator, organizational, direct and general support, and depot maintenance manual : drill, pneumatic, drifter, boom-type, crawler-mounted, self-propelled (Ingersoll-Rand model CM150A/D475A) FSN 3820-854-4149.

Includes index.

Operator, organizational, direct and general support, and depot maintenance manual : breaker, paving, dual purpose, sinker drill and paving breaker, GED (Atlas Copco Ind. [i.e. Inc.] Cobra model BBM 47L), FSN 3820-902-3107.

"November 1967."

Operator's manual : drilling system, well, rotary, truck mounted, air transportable, 600 feet capacity : model LP-12, NSN 3820-01-246-4276.

Includes index.

Organizational and direct support, repair parts, and special tools list for drill, pneumatic, drifter, crawler mounted, self propelled, dry type, 220 lb class, minimum 4-1/2 inch bore, power feed, 1-1/2 inch lugged shank chuck w/ 12 each [sic] shank rock drill (Chicago Pneumatic Tool Company model G-900) (NSN 3820-00-930-1917).

"May 1976."

Unit, direct support, and general support maintenance repair parts and special tools lists : drill, pneumatic, drifter, boom-type, crawler-mounted, self-propelled (NSN 3820-00-854-4149), Ingersoll-Rand model CM150A/D475A.

"May 1992."

The Cleveland Twist Drill Co. : manufacturers of drills, reamers, screw extractors, arbors, mandrels, sockets, mills, counterbores, high speed tools : catalog 39.

Includes indexes.

The panorama of science and art; embracing the sciences of aerostation, agriculture and gardening, ... The arts of building, brewing, bleaching, ... The methods of working in wood and metal, applicable in annealing, boring and drilling, ... and a miscellaneous selection of interesting and useful processes and experiments. Vol. I.

Mode of access: Internet.

A method of immersion of panels for ecological studies on marine fouling and boring organisms

The importance of studies on the biology of marine foulers and borers needs no emphasis since they cause damage to submerged wooden structures resulting in considerable economic loss. In order to study their occurrence, settlement and to assess the rate of destruction to timber, several immersion techniques using iron racks, cages and rafts have been adopted. On the east and west coasts of India, at the Marine Centres of Forest Research Institute (Waltair, Madras, Cohin and Bombay) investigations have so far been carried out employing the first two methods.

Fibre laser microvia drilling and ablation of Si with tuneable pulse shapes

The dramatic increase in hole quality on single crystalline silicon with an 1 μm fiber laser has been reported recently, it redefines the processing options for Si at that wavelength. This study investigated the effects of the MOPA based pulse tuning on the changes of the machined depth and the mass removal mechanism for the generation of microvia holes. Hole depths were measured and surface morphology studied using SEM and optical interferometric profilometry. The pulse peak power was found to strongly influence the material removal mechanism with fixed pulse duration. High peak powers (>1 kW) gave vaporization dominated ablation, left a limited re solidified molten layer and clean hole formation. The pulse duration was found to strongly influence the machined depth. Longer pulse durations generated deeper holes with constant peak power (>1 kW). In comparison with the DPSS UV laser, the IR fiber laser of longer pulse durations machined deeper holes and generated less resolidifed melt beyond the hole rim at high fluencies. The comparison suggests that some applications (microvia drilling) of the DPSS UV laser can be replaced with the more flexible, low cost IR fiber laser. © KSPE and Springer 2012.

Methane contamination of drinking water accompanying gas-well drilling and hydraulic fracturing.

Directional drilling and hydraulic-fracturing technologies are dramatically increasing natural-gas extraction. In aquifers overlying the Marcellus and Utica shale formations of northeastern Pennsylvania and upstate New York, we document systematic evidence for methane contamination of drinking water associated with shale-gas extraction. In active gas-extraction areas (one or more gas wells within 1 km), average and maximum methane concentrations in drinking-water wells increased with proximity to the nearest gas well and were 19.2 and 64 mg CH(4) L(-1) (n = 26), a potential explosion hazard; in contrast, dissolved methane samples in neighboring nonextraction sites (no gas wells within 1 km) within similar geologic formations and hydrogeologic regimes averaged only 1.1 mg L(-1) (P < 0.05; n = 34). Average δ(13)C-CH(4) values of dissolved methane in shallow groundwater were significantly less negative for active than for nonactive sites (-37 ± 7‰ and -54 ± 11‰, respectively; P < 0.0001). These δ(13)C-CH(4) data, coupled with the ratios of methane-to-higher-chain hydrocarbons, and δ(2)H-CH(4) values, are consistent with deeper thermogenic methane sources such as the Marcellus and Utica shales at the active sites and matched gas geochemistry from gas wells nearby. In contrast, lower-concentration samples from shallow groundwater at nonactive sites had isotopic signatures reflecting a more biogenic or mixed biogenic/thermogenic methane source. We found no evidence for contamination of drinking-water samples with deep saline brines or fracturing fluids. We conclude that greater stewardship, data, and-possibly-regulation are needed to ensure the sustainable future of shale-gas extraction and to improve public confidence in its use.