RJ Siu, Inc. believes there is an untapped party market at the North Pole. Tai-U-Pay-We-Go Analysts was hired to make ex

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Rj Siu Inc Believes There Is An Untapped Party Market At The North Pole Tai U Pay We Go Analysts Was Hired To Make Ex 1 (1.18 MiB) Viewed 23 times

Rj Siu Inc Believes There Is An Untapped Party Market At The North Pole Tai U Pay We Go Analysts Was Hired To Make Ex 2 (140.55 KiB) Viewed 23 times

RJ Siu, Inc. believes there is an untapped party market at the North Pole. Tai-U-Pay-We-Go Analysts was hired to make extensive marketing studies and determined that "Rhandi's Polar Bar & Grille" would be very successful during those long dark arctic winters. We Over the Hill We Go, Inc. will be employed to manage the construction of the project and has hired you to analyze the foundation-drilling program. The plan is to construct the main igloo unit 20-ft below the surface of the ice. A subdrilling depth of 2-ft was determined to be sufficient in order to ensure the required floor elevation is met. From field-testing with a 90-psi rotary-percussion drill, you have determined that a direct drilling rate of 175-ft per hour penetration through the polar ice can be achieved using 3.5" HD bits. The drill steel will be 12-ft long. The ice characteristics are similar to Low Silica, LA>20 Diabase (Reference: Table 11.10a). The blasting pattern will be a 12-ft x 12-ft grid. The cold climate will allow only a 40-minute per hour efficiency. Calculate the expected drilling production in ft/hr (15 pts)
Construction Planning, Equipment, allu 352 TABLE 11.10a Igneous rock: Average life for drill bits and steel in feet Igneous rock High High silica silica Medium silica LA <50 Drill bits LA <20 20<LA <50 (rhyolite) (granite) (granite) (ft) (ft) (ft) (in.) 3 3 3/1/2 3 3 4 Rotary bits ១១.១១ 6 750 750 NR NR 750 NR 1,400 1,000 2,700 2,500 2,800 3,000 NR NR NR NR NR NR NR NR 1,500 2,000 NR 2,400 3,500 500 1,800 2,200 2,500 4,500 700 5,800 10 ft 700 5,850 Steel 1,450 12 ft 800 5 in. 950 2,200 1,500 20 ft 1,600 25,000 2,600 1,650 5,000 abrasion test, which is widely used as an indicator of the relative quality or competence of mineral aggregates. 52,000 3,000 B=button, CB= carbide button, HD-heavy duty, ST steel tooth, STD= standard, NR not recommended, LA = The LA 3,500 60,000 75,000 100,000 should be able to achieve a 45-min production hour. But as the Australian Experienced drillers working on large projects with good equipment studies showed, good equipment and the proper bits are critical to realizing good production. If the situation is sporadic drilling with qualified people, a 40-min or lower production hour might be more appropriate. The estimator needs to consider the specific project requirements and the skill of the avail- able labor pool before deciding on the appropu common on many large-scale drilli tandem to meet production ry. It is ST ST ST ST CB 7/7/ CB Downhole bits 6 B Drill steel Shanks Couplings Steel 6 Type B STD STD HD B B 250 NR NR 200 550 750 % % % % % % NR NR NR NR NR Low silica LA <20 (basalt) (ft) 500 NR NR 575 1,200 1,500 NR NR NR NR NR 1,700 1,000 Low silica LA > 20 (diabase) (ft) 1,000 750 1,500 2,000 3,200 3,500 NR NR NR 800 4,000 6,000 3,000 6,000 1,100 2,200 r d