B02 Practical Exercise Steel Cutting Charges

docx

School

Concorde Career Colleges, Memphis *

*We aren’t endorsed by this school

Course

12BALC

Subject

Mechanical Engineering

Date

Feb 20, 2024

Type

docx

Pages

Uploaded by andrew_lamance

est PE - B02: Calculate Steel Cutting Charge Practical Exercise Started 12/3/23 2:01 PM Submitted 12/3/23 2:07 PM Status Completed Attempt Score 190 out of 190 points Time Elapsed 5 minutes Instruction s Overall Scenario: Your unit is set to conduct a mobility mission. On this mission, your unit comes across a set of railroad rails and several other steel obstacles blocking the unit from proceeding any further. To pass the obstacles, you must perform a number of steel-cutting demolitions Calculate Steel Cutting Charge Overview: Engineer units are responsible for determining demolition charge calculations associated with various missions. The correct calculation of demolition charges is essential. Improper calculations may lead to mission failure; equipment, property, or collateral damage; and even personnel injury or death. NCOs must maintain ultimate responsibility for demolition systems design, ensuring the safe and efficient application of explosives. Calculating steel-cutting charges requires the six-step problem solving format and the appropriate formulas in accordance with TM 3-34.82. Steel Cutting Charge Calculation Activities:  Use the appropriate formula to calculate the required charge for structural steel sections: P = 3 /8 (A) or P = 0.375 (A).  Use the appropriate formula to calculate the required charge for high- carbon or alloy steel: P = D x D.  Apply the rule of thumb cutting application to determine the required amount of charge for steel bars, rods, chains, and cables.  Use the rule of thumb cutting application to determine the required amount of charge for railroad rails.  Determine required charge amount of plastic explosive (M112) charges for special cutting charges. References:  TM 3-34.82, Explosives and Demolitions, 07 March 2016  GTA 05-10-033, Demolitions Card, 03 Jan 1994 Results Displayed Submitted Answers, Feedback, Incorrectly Answered Questions  Question 1 10 out of 10 points Activity 1 (Questions 1-5): Your unit has been tasked with calculating the number of packages of Composition C4 necessary to cut structural steel using the structural steel-cutting, or block, charge. Using the six step formula and the structured steel cutting formula (P = 3 / 8 (A) or P = 0.375 (A)), determine how many packages of C4 (M112) it would take to cut two I-beams, using block steel-cutting charge. Task : Before beginning to calculate the steel cutting charge, you need to demonstrate your understanding of the six step charge calculation process. o Questi on Selected Match

Response Feedback: Correct. Nice work, SSG. You correctly identified the six step charge calculation process.  Question 2 10 out of 10 points Activity 1 (Questions 1-5): Your unit has been tasked with calculating the number of packages of Composition C4 necessary to cut structural steel using the structural steel-cutting, or block, charge. Using the six step formula and the structured steel cutting formula (P = 3 / 8 (A) or P = 0.375 (A)), determine how many packages of C4 (M112) it would take to cut two I-beams, using block steel-cutting charge. Task : For this mission, assume you have completed step 1 and determined that the dimensions of the steel are: Top flange = 9” x 1” = 9 sq in Web = 16” x 1”= 16 sq in Bottom flange = 9” x 1” = 9 sq in What is the weight of a single charge of TNT necessary to cut this steel? Submit your response in numerals. _____ pound(s) Selected Answer: 12.7 5 Response Feedback: Correct. Nice work, SSG. To cut this I-beam, you would need 12.75 pounds of TNT. P = 3 / 8 (A) or P = 0.375 (A) P = 3/8 (34) P = 12.75 pounds of TNT  Question 3 10 out of 10 points Activity 1 (Questions 1-5): Your unit has been tasked with calculating the number of packages of Composition C4 necessary to cut structural steel using the structural steel-cutting, or block, charge. Using the six step formula and the structured steel cutting formula (P = 3 / 8 (A) or P = 0.375 (A)), determine how many packages of C4 (M112) it would take to cut two I-beams, using block steel-cutting charge. Task : Now that you’ve identified the weight of a single charge of TNT is 12.75 lbs, the next step is to divide the quantity of explosive by the RE factor. What is the RE factor you will use for this equation? Explosive RE Factor TNT 1.00 M112 demolition charge 1.34 M186 roll 1.14 Ammonium Nitrate Cratering Charge 0.42

Composition H6 Cratering Charge 1.33 M1 dynamite 0.92 Selected Answer: b. 1.34 Response Feedback: Correct. Nice work, SSG. The RE factor for C4 is 1.34. Using this RE factor, the calculation to divide the quantity of explosives by the RE factor is: P/RE = pounds of explosive 12.75/1.34 = 9.51 pounds of C4.  Question 4 10 out of 10 points Activity 1 (Questions 1-5): Your unit has been tasked with calculating the number of packages of Composition C4 necessary to cut structural steel using the structural steel-cutting, or block, charge. Using the six step formula and the structured steel cutting formula (P = 3 / 8 (A) or P = 0.375 (A)), determine how many packages of C4 (M112) it would take to cut two I-beams, using block steel-cutting charge. Task : You have determined that you require 8 packages of C4 for a single charge. How many packages will you need to complete the mission to cut two I-beams? Calculate the total number of packages of explosives, and then submit your response in numerals. _____ packages Selected Answer: 1 6 Response Feedback : Correct. Nice work, SSG. The total quantity of explosives required is determined by multiplying the number of charges by the number of packages required per charge. Because the mission is to remove two I-beams, you will require 16 packages of C4. Packages * Target 8 packages * 2 targets = 16 packages of TNT  Question 5 10 out of 10 points Activity 1 (Questions 1-5): Your unit has been tasked with calculating the number of packages of Composition C4 necessary to cut structural steel using the structural steel-cutting, or block, charge. Using the six step formula and the structured steel cutting formula (P = 3 / 8 (A) or P = 0.375 (A)), determine how many packages of C4 (M112) it would take to cut two I-beams, using block steel-cutting charge. Task : Calculate the number of packages of TNT it would take to cut 4 I-beams, using hasty steel- cutting chart. _____ packages Selected Answer: 4 8

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Response Feedback: Correct. Nice work, SSG. The flanges require 4.2 lbs and the web 3.3 lbs for a total lbs or 12 packages of TNT for each beam. To cut 4 beams, you will require 48 pack TNT.  Question 6 10 out of 10 points Activity 2 (Questions 6-9): Your unit has been tasked with calculating the number of packages of TNT necessary to cut a steel plate using a high-carbon and/or alloy steel-cutting charge. Using the six step formula and the high-carbon or alloy steel formula (P = D*D), determine how many packages of TNT it would take to cut the steel plate. Task : First you must determine which products are likely to be manufactured of alloy steel. Which of the following products are likely to be manufactured from alloy steel? Selected Answers: b. Gears c. Tools Response Feedback: Correct. Great work, Soldier. Gears and tools are products likely manufactured with alloy steel.  Question 7 10 out of 10 points Activity 2 (Questions 6-9): Your unit has been tasked with calculating the number of packages of TNT necessary to cut a steel plate using a high-carbon and/or alloy steel-cutting charge. Using the six step formula and the high-carbon or alloy steel formula (P = D*D), determine how many packages of TNT it would take to cut the steel plate. Task : Next collect the critical dimensions of the chain. Which of the following measurements will you use? Selected Answer: c. Diameter Response Feedback: Correct. Nice work, SSG. For a high carbon or alloy steel charge, the formula is: P = D 2 , where P = the required explosive in pounds and D = the diameter or thickness of the section to be cut (in inches).  Question 8 10 out of 10 points Activity 2 (Questions 6-9): Your unit has been tasked with calculating the number of packages of TNT necessary to cut a steel plate using a high-carbon and/or alloy steel-cutting charge. Using the six step formula and the high-carbon or alloy steel formula (P = D*D), determine how many packages of TNT it would take to cut the steel plate. Task : What is the weight of a single charge of TNT necessary to cut a steel chain with a diameter of 2 inches using the alloy steel charge calculation? Submit your response in numerals. _____ pound(s) Selected Answer: 4

Response Feedback: Correct. Nice work, SSG. To cut a steel chain with a diameter of 2 inches, you will need 4 pounds of TNT. P = (D * D) ]P = (2*2) P = (4) P = 4 pounds of TNT  Question 9 10 out of 10 points Activity 2 (Questions 6-9): Your unit has been tasked with calculating the number of packages of TNT necessary to cut a steel plate using a high-carbon and/or alloy steel-cutting charge. Using the six step formula and the high-carbon or alloy steel formula (P = D*D), determine how many packages of TNT it would take to cut the steel plate. Task : Referencing the table below, perform the calculation to determine the number of packages of C4 explosive for a single charge requiring 64 pounds of TNT. Enter your answer in the space below. Submit your response in numerals. Explosive RE Factor Unit (lb) TNT 1.00 1.00 M112 demolition charge 1.34 1.25 M186 roll 1.14 25.00 Ammonium Nitrate Cratering Charge 0.42 43.00 Composition H6 Cratering Charge 1.33 43.00 M1 dynamite 0.92 0.50 _____ packages Selected Answer: 3 9 Response Feedback: Correct. Nice work, SSG. This charge will require 39 packages of C4: First, divide 64lbs by the C4 RE Factor: P/RE = lbs. of explosive 64/1.34 = 47.76 lbs. of C4 Then, determine the number of packages: P/Pkg Wt = number of packages 47.76/1.25 = 38.20 Round up to 39 packages   

 Question 10 10 out of 10 points Activity 3 (Questions 10-13): Your unit is tasked with calculating the number of TNT packages necessary to cut steel bars, rods, chains, and cables. Calculate the charge necessary to cut the items using the rule of thumb method. Task : Your first step is to calculate the explosives necessary to cut the chain shown here. Enter your answer in the space below. Submit your response in numerals. _____ pound(s) Selected Answer: 1 Response Feedback: Correct. Nice work, SSG. For materials up to 1 inch in diameter or thickness, you’ll apply the rule of thumb method and use one pound of explosives.  Question 11 10 out of 10 points Activity 3 (Questions 10-13): Your unit is tasked with calculating the number of TNT packages necessary to cut steel bars, rods, chains, and cables. Calculate the charge necessary to cut the items using the rule of thumb method. Task : Your next step is to calculate the explosives necessary to cut the steel rod shown here. Enter your answer in the space below. Submit your response in numerals. ____ pound(s) Selected Answer: 2 Response Feedback: Correct. Nice work, SSG. For materials between 1 and 2 inches in diameter or thickness, you’ll apply the rule of thumb method and use two pounds of explosives.  Question 12 10 out of 10 points Activity 3 (Questions 10-13): Your unit is tasked with calculating the number of TNT packages necessary to cut steel bars, rods, chains, and cables. Calculate the charge necessary to cut the items using the rule of thumb method. Task : Your next step is to calculate the explosives necessary to cut the chain shown here. Which of the following would you use to make that calculation? Selected Answer: c. Use the formula: P = D²

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Response Feedback: Correct. Nice work, SSG. For materials over 2 inches in diameter, you’ll use the formula for high carbon or alloy steel charge: P = D 2 , where P = the required TNT in pounds and D = the diameter or thickness of section to be cut (in inches).  Question 13 10 out of 10 points Activity 3 (Questions 10-13): Your unit is tasked with calculating the number of TNT packages necessary to cut steel bars, rods, chains, and cables. Calculate the charge necessary to cut the items using the rule of thumb method. Task : Which of the following represents the ideal placement of explosives on a chain? Selected Answer: b. Response Feedback: Correct. Nice work, SSG. Explosives should bridge both sides of the link or fit snugly between two links. If the explosive is not large enough to bridge both sides, two blocks should be used.  Question 14 10 out of 10 points Activity 4 (Questions 14-16): Your unit is tasked with destroying a segment of railroad lines to prevent insurgents from conducting resupply operations by utilizing captured rail lines and equipment. To do so, your unit must calculate the number of TNT packages necessary to cut railroad rails using the rule of thumb cutting application. Task 1 : Calculate the weight of explosives necessary to cut the railroad rail shown below. Submit your response in numerals. _____ pound(s) Selected Answer: 1/ 2 Response Feedback: Correct. Nice work, SSG. For rails that are less than 5 inches high, you’ll use 1/2 pound of explosives.  Question 15 10 out of 10 points Activity 4 (Questions 14-16): Your unit is tasked with destroying a segment of railroad lines to prevent insurgents from conducting resupply operations by utilizing captured rail lines and equipment. To do so, your unit must calculate the number of TNT packages necessary to cut railroad rails using the rule of thumb cutting application. Task : Calculate the weight of explosives necessary to cut the railroad rail shown below. Submit your response in numerals.

_____ pound(s) Selected Answer: 1 Response Feedback: Correct. Nice work, SSG. For rails that are 5 inches or more in height, such as rail crossovers or switches, you’ll use 1 pound of explosives.  Question 16 10 out of 10 points Activity 4 (Questions 14-16): Your unit is tasked with destroying a segment of railroad lines to prevent insurgents from conducting resupply operations by utilizing captured rail lines and equipment. To do so, your unit must calculate the number of TNT packages necessary to cut railroad rails using the rule of thumb cutting application. Task : Calculate the weight of explosives necessary to cut the railroad frog shown below. Submit your response in numerals. _____ pound(s) Selected Answer: 2 Response Feedback: Correct. Nice work, SSG. Railroad frogs require 2 pounds of explosives. If possible, charges should be placed at vulnerable points (frogs, switches, crossovers).  Question 17 10 out of 10 points Activity 5 (Questions 17-19): Your unit is tasked with destroying steel members using various special cutting charges. Determine required charge amount of plastic explosive (M112) charges for special cutting charges. Task : Determine the volume of the explosive you would require to cut the member illustrated below using a ribbon charge. _____ cubic inches Selected Answer: 121. 5 Response Feedback: Correct. Nice work, SSG. For ribbon cutting charges, the charge thickness is equal to ½ the target thickness, in this case 1.5 inches; the charge width is equal to three times the charge thickness, or 4.5 inches; and the charge length is equal to the length of the desired cut, which is 18 inches. Those critical dimensions inputted into our formula for volume (volume = T x W x L), 1.5 x 4.5 x 18 = 121.5. So the volume of the ribbon explosive in this case is 121.5 cubic inches.  Question 18 10 out of 10 points

Activity 5 (Questions 17-19): Your unit is tasked with destroying steel members using various special cutting charges. Determine required charge amount of plastic explosive (M112) charges for special cutting charges. Task : Using the information below, determine the number of packages of C4 you will require to cut these round steel bars using a saddle charge. _____ Packages of C4 Selected Answer: 2 0 Response Feedback: Correct. Nice work, SSG. For saddle cutting charges, the charge thickness is 1 inch, the standard thickness for M112 explosives. The charge volume is calculated by the formula volume = long axis (circumference) x base (1/2 circumference) x .05, in this case, 18 x 9 x .5 = 81 cu. in. When divided by the C4 volume of 20 cubic inches, that equates to 4.05, which is rounded up to 5 packages of C4. For 4 targets, you will require 20 packages of C4.  Question 19 10 out of 10 points Activity 5 (Questions 17-19): Your unit is tasked with destroying steel members using various special cutting charges. Determine required charge amount of plastic explosive (M112) charges for special cutting charges. Task : Using the information below, determine the number of packages of C4 you will require to cut these round steel bars using a diamond charge. _____ Packages of C4 Selected Answer: 2 1 Response Feedback: Correct. Nice work, SSG. For diamond cutting charges, the charge volume is calculated by the formula volume = long axis x base x .05, in this case, 49 cubic inches. When divided by the C4 volume of 20 cubic inches, that equates to 2.45, which is rounded up to 3 packages of C4. For 7 targets, you will require 21 packages of C4.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version