CreoleCook
Posts: 321
Joined: 10/9/2005 Status: offline
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ORIGINAL: WhipTheHip A sub question. Anyone know how much ballast is needed for a 126 ton sub? 4A2. Main ballast tanks. The main ballast tanks group consists of four groups, which are further subdivided into ten tanks, as follows: TANK CAPACITY 1. MBT No. 1 49.17 tons sea water 2. MBT Nos. 2A, 2B, 2C and 2D 129.03 tons sea water (4 tanks) 3. MBT Nos. 6A, 6B, 6C and 6D 141.60 tons sea water (4 tanks) 4. MBT No 7 39.09 tons sea water 4A3. Variable ballast tanks. The second group of water tanks is the variable ballast tank group which is composed of six tanks as follows: TANK CAPACITY 1. Forward trim tank 24.31 tons sea water 2. Forward WRT tank 4.94 tons sea water 3. Auxiliary ballast tank No. 1 30.77 tons sea water 4. Auxiliary ballast tank No. 2 30.77 tons sea water 5. After trim tank 19.97 tons sea water 6. After WRT tank 5.06 tons sea water 4A4. Special ballast tanks. The safety, negative, and bow buoyancy tanks are classified as special ballast tanks. Each of these tanks has special blowing arrangements and a special purpose, which is described in detail in later sections of this chapter. TANK CAPACITY 1. Safety tank 23.23 tons sea water 2. Negative tank 7.51 tons sea water 3. Bow buoyancy tank 31.69 tons sea water 39 4A5. Fuel Ballast tanks. There are three fuel ballast tanks divided into A and B sections which are connected together through limber holes in the vertical keel plating. The tanks are as follows: TANK CAPACITY 1. Fuel ballast tanks Nos. 3A and 3B 19,196 gallons 2. Fuel ballast tanks Nos. 4A and 4B 24,089 gallons 3. Fuel ballast tanks Nos. 5A and 5B 19,458 gallons The fuel ballast tanks normally carry fuel oil. When not being used as fuel ballast tanks, they may be used as main ballast tanks. 4A6. Additional tanks. In addition to the above-named water ballast tanks, there are the normal fuel oil tanks, collecting tank, expansion tank, clean fuel oil tank, normal lubricating oil tank, reserve lubricating oil tank, main sump tanks, reduction gear sump tanks, fresh water tanks, emergency fresh water tanks, battery fresh water tanks and sanitary tanks. The capacity of these tanks is given in the following table. TANK CAPACITY Normal fuel oil tank group: 1. NFOT No. 1 11,401 gallons 2. NFOT No. 2 13,122 gallons 3. NFOT No. 6 15,201 gallons 4. NFOT No. 7 10,054 gallons 5. Collecting tank 2,993 gallons 6. Expansion tank 2,993 gallons Clean fuel oil tank group: 1. CFOT No. 1 611 gallons 2. CFOT No. 2 618 gallons Normal lubricating oil tank group: 1. NLOT No. 1 1,475 gallons 2. NLOT No. 2 924 gallons 3. NLOT No. 3 1,073 gallons 4. Reserve lube oil tank 1,201 gallons 40 TANK CAPACITY Main engine sump tank group: 1. Main engine sump No. 1 382 gallons 2. Main engine sump No. 2 382 gallons 3. Main engine sump No. 3 382 gallons 4. Main engine sump No. 4 382 gallons 5. Reduction gear sump No. 1 165 gallons 6. Reduction gear sump No. 2 165 gallons Fresh water tank group: 1. Fresh water tank No. 1 980 gallons 2. Fresh water tank No. 2 980 gallons 3. Fresh water tank No. 3 973 gallons 4. Fresh water tank No. 4 973 gallons 5. Emergency fresh water tanks 276 gallons (total) a. 2 tanks forward torpedo room 276 gallons (total) b. 1 tank control room 18 gallons c. 1 tank maneuvering room 8 gallons d. 1 tank aft torpedo room 180 gallons Battery water tanks: 1,208 gallons (total) 1. Battery water tanks Nos. 1 and 2 152 gallons (each) 2. Battery water tank No. 3 143 gallons 3. Battery water tank No. 4 157 gallons 4. Battery water tank Nos. 5 and 6 152 gallons (each) 5. Battery water tank No. 7 157 gallons 6. Battery water tank No. 8 143 gallons Sanitary tanks: 1. Sanitary tank No. 1 1.66 tons or 434 gallons 2. Sanitary tank No. 2 2.57 tons or 673 gallons 41 4A7. Test pressure and data. The tank and groupings, together with their capacities outlined in Sections 4A2 and 4A6 inclusive, are those tanks which are designed to contain liquids under any normal or emergency condition of operation of the vessel. These tanks are subjected to the individual tests listed in the following chart: TANK TYPE OF TEST 1. MBT No. 1 A. S. & T. 15 psi Tests made 2. MBT Nos. 2A and 2B, 2C and 2D A. S. & T. 15 psi before flood 3. MBT Nos. 6A and 6B, 6C and 6D A. S. & T. 15 psi ports are cut 4. MBT No. 7 A. S. & T. 15 psi into tank. 5. Forward trim tank W. S. & T. Test depth 6. Forward WTB tank W. S. & T. Test depth 7. Auxiliary tank No. 1 W. S. & T. Test depth 8. Auxiliary tank No. 2 W. S. & T. Test depth 9. After trim tank W. S. & T. Test depth 10. Safety tank W. S. & T. Test depth 11. Negative tank W. S. & T. Test depth 12. Bow buoyancy W. S. & T. 13. FBT Nos. 3A and 3B W. S. & T. 102 ft. head to keel 14. FBT Nos. 4A and 4B W. S. & T. 102 ft. head to keel 15. FBT Nos. 5A and 5B W. S. & T. 102 ft. head to keel 16. NFOT No. 1 W. S. & T. 102 ft. head to keel 17. NFOT No. 2 W. S. & T. 102 ft. head to keel 18. NFOT No. 6 W. S. & T. 102 ft. head to keel 19. NFOT No. 7 W. S. & T. 102 ft. head to keel 20. Collecting tank W. S. & T. 102 ft. head to keel 21. Expansion tank W. S. & T. 102 ft. head to keel 22. CFOT No. 1 W. S. & T. 60 ft. head to keel 23. CFOT No. 2 W. S. & T. 60 ft. head to keel 24. NLOT No. 1 W. S. & T. 35 ft. head to keel 25. NLOT No. 2 W. S. & T. 35 ft. head to keel 26. NLOT No. 3 W. S. & T. 35 ft. test depth 27. Reserve lube oil tank W. S. & T. 35 ft. head to keel 28. Main engine sump No. 1 W. S. & T. 35 ft. head to keel 29. Main engine sump No. 2 W. S. & T. 35 ft. head to keel 42 TANK TYPE OF TEST 30. Main engine sump No. 3 W. S. & T. 35 ft. head to keel 31. Main engine sump No. 4 W. S. & T. 35 ft. head to keel 32. Reduction gear sump No. 1 W. S. & T. test depth 33. Reduction gear sump No. 2 W. S. & T. test depth 34. Fresh water tank No. 1 A. S. & T. 18 psi 35. Fresh water tank No. 2 A. S. & T. 18 psi 36. Fresh water tank No. 3 A. S. & T. 18 psi 37. Fresh water tank No. 4 A. S. & T. 18 psi 38. Emergency fresh water tank No. A. S. & T. 10 psi 39. Battery water tanks Nos. 1 and 2 A. S. & T. 18 psi 40. Battery water tank No. 3 A. S. & T. 18 psi 41. Battery water tank No. 4 A. S. & T. 18 psi 42. Battery water tanks Nos. 5 and 6 A. S. & T. 18 psi 43. Battery water tank No. 7 A. S. & T. 18 psi 44. Battery water tank No. 8 A. S. & T. 18 psi 45. Sanitary tank No. 1 W. S. & T. test depth 46. Sanitary tank No. 2 W. S. & T. test depth First and foremost, I need clarification of exactly what sort of ballast you are speaking of? Considering there are about 40 versions of "ballast" on a submarine. Now in reference to your question above, if you are speaking of diving in a submarine... there are several key peices of information needed, in order to equate exactly how much ballast is needed for this rather dinky sized submarine you are speaking of. Most of the models I have found concerning submarines are based on 1,500 tons. I am somewhat thinking you are speaking of a submersible, rather than a true submarine, but this is beside the point. Key questions needed to give an accurate answer: 1) What is the surface displacement of sub? 2) How much does she draw? 3) Assuming you include the weight of fuel, oil, and lube oil into the total of the draw, how many does she hold? Upon finding out this information, then we can come to a total water displacement figure, and proceed from there, as to specifics of how much ballast is needed, to dive.
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"If I owned Texas, and Hell, I would rent out Texas, and live in Hell." ~Gen. John Sheridan, 1855 "I was thinking of the immortal words of socrates, who said, 'I drank what?'" ~Chris Knight, Real Genius
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