Tham khảo tài liệu 'industrial ventilation episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | UFC 3-410-04N 25 October 2004 Figure 4-1. Layout for the MK-46 fuel defuel and afterbody breakdown room. Figure 4-2. Series of hood in the MK-46 shop. Ports washer Workbench stand up backdraft hoods Workbench Parts washer hood hood Figure 4 3 hood hood Figure 4-5 Figure 4-4 Figure 4-4 Figure 4-5 Fuel Tank 3 Work Flow Afterbody Elevation View 4-2 UFC 3-410-04N 25 October 2004 Figure 4-3. MK-46 standup backdraft hood. NOTES 1 When hood is free standing use side and top baffles. 2. Capture velocity s 150 fpm 3. Flowrate s 15Cifpm L x H 4. Slot velocity s 2CiÓũfpm 5. Plenum velocity 1 2 í Slot Velocity 6. Light fixture is corrosion resistant vented and flush mounted. 7. Mount hood on a 51mm 2in high sealed concrete base. 8. Use perforated metal plate 10mm 3 Sin diameter indented hales 51 open area to cover slots. A 432mm C17in B b35nn iESin C 1092m 43im D 1835r im Slim d. Hood transitions takeoffs with an included angle no greater than 90 degrees. Length of the hood served by an exhaust plenum is not to exCeed m 8 ft . For example hoods between and m 8 and 16 ft in length have two exhaust takeoffs. e. Baffles to control airflow from the sides and top of the hood bank as shown on Figure 4-3. MK-46 Workbench Hood. After defueling and decoupling workers lift the fuel and engine sections onto two different ventilated workbenches. They remove the stabilizing baffles in the fuel section inspect and wipe them clean before loading the baffles into the parts washer. Personnel also dismantle the engine section to inspect the engine fuel pump and seawater pump before loading them into the parts washer. Design a backdraft exhaust hood as illustrated in Figure 4-4 to control contaminants generated by these workbench operations. MK-46 Parts Washer Hood. Design parts washer as shown on Figure 4- 5 to clean off oils and excess Otto Fuel II from torpedo components. The parts washer cover must automatically close in case of fire in .
