1 / 30

7.16

TANK CLEANING INERTING AND PRESSING-UP. 7.16. ENABLING OBJECTS. DESCRIBE the following methods of tank cleaning: a) Hot or Cold Water Wash b) Steam Cleaning c) Butterworthing / Wheelerizing d) Chemical Cleaning e) Biological Cleaning

elisha
Download Presentation

7.16

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TANK CLEANING INERTING AND PRESSING-UP 7.16

  2. ENABLING OBJECTS DESCRIBE the following methods of tank cleaning: a) Hot or Cold Water Wash b) Steam Cleaning c) Butterworthing / Wheelerizing d) Chemical Cleaning e) Biological Cleaning DESCRIBE the proper cleaning and testing processes for safe entry and hot work in the following types of tanks: a) Diesel Fuel Marine (DFM) b) JP-5 c) Gasoline d) Collection, Holding and Transfer (CHT) e) Closed Compartments DESCRIBE the safety precautions and procedures for performing emergency hot work on tanks when proper cleaning cannot be accomplished and the following methods are used:  a) Inerting b) Pressing-Up c) Steam Blanketing

  3. REFERENCES -MILITARY HDBK,CARGO TANK CLEANING NAVSEA MIL-HDBK-291 -GAS FREE ENGINEERING, NSTM 074, VOLUME 3 (sect 23 & 24) -PETROLEUM FUEL STOWAGE, NSTM 541 -GASOLINE AND JP-5 SYSTEMS, NSTM 542 -POLLUTION CONTROL, NSTM 593

  4. REASONS TO CLEAN -SCHEDULED MAINTENANCE - INTERVAL DETERMINED BY PMS BASED ON SYSTEM TYPE AND NATURE OF CARGO CARRIED -CORRECTIVE MAINTENANCE- EX: REPAIR TANK LEVEL INDICATORS CLEARING FOULED SOUNDING TUBES -AFTER BALLASTING -AFTER REMOVING CONTAMINATED CARGO

  5. Safety precautions during cleaning operations 1. Ensure tank atmosphere is routed to the weather decks. (a) Seal off other spaces‑set Zebra‑establish fume tight boundary. (b) Use 8/10” non‑collapsible ducting to route atmosphere to weather decks. 2. Smoking lamp out except for designated spaces 3. 200' exclusion area around tank. 4. No open flame, hot work, operating engines, exposed lights. 5. Tank cleaning personnel may NOT have cigarette lighters, matches, exposed lights (flashlights). 6. All metal on tank cleaning personnel must be removed, i.e., rings, watches, belt buckles, key chains, etc. 7. Supplied Air device is required unless not carried on board. 8. Tank continuously vented ‑ gas freed.

  6. 9. Safety observer at tank access opening.   Keep count of # of men in tank. Keep in contact with men in tank. Sound the alarm if necessary. 10. Suitable fire extinguishing apparatus available. 11. Use only non sparking tools. 12. All clothing worn must be changed and washed at the end of each day. 13. Utilize proper protective clothing and footwear. Water or oil coated surfaces are slick. Wear rubber soled boots. Molded hand wear and no loose clothing. Goggles and respirator. 14. Use lifelines. 15. Designate and man Rescue Control Point

  7. CLEANING METHODS WATER WASH CHEMICAL BUTTERWORTHING STEAM BIOLOGICAL

  8. WATER WASH -MOST COMMON TYPE OF CLEANING -MUST PROVIDE A CONTINUOUS DEWATERING (MUCKING) -BUDDY SYSTEM -WIPE DOWN WITH RAGS

  9. -EXPENSIVE CHEMICAL -FOR TOUGH TO CLEAN JOBS -HANDLING AND HAZARDOUS WASTE PROBLEM -THOROUGH FINAL RINSE REQUIRED TO PREVENT CONTAMINATION OF THE PRODUCT

  10. BUTTERWORTHING -MECHANICAL METHOD -PROCESS NAME IS DERIVED FROM EQUIPMENT NAME -HOT WATER AT HIGH PRESSURE (175 PSI) DIRECTED 360 DEG THROUGH 1/2” NOZZLES AT A RATE OF 180 GPM - FOR TANKS WITH EPOXY COATING WATER TEMP IS LIMITED TO 1250F -TANK MUST BE CONTINUALLY STRIPPED -NORMALLY ACCOMPLISHED AT SHIPYARDS AND ABOARD AO'S,AOR'S AND AOE'S

  11. STEAM CLEANING -CANNOT BE USED ON PLASTIC OR EPOXY COATED TANKS (JP-5) -USED TO STEAM OUT MOGAS TANKS -TEMP MAY NOT EXCEED 2300F. -APPLY 50 OR 150 PSI STEAM FOR A PERIOD OF 24 HOURS THROUGH TANK TOP CONNECTION

  12. BIOLOGICAL -USED FOR CHT AND FUEL TANKS -USE IN COLD WATER -FLUSH TANK AND FILL WITH FRESH WATER USE GLOVES, COVERALLS AND SUPPLIED AIR DEVICE WHILE HANDLING MICROBES -LET STAND FOR 48 HOURS THEN DUMP AND FLUSH -CHLORINATE X 4 HOURS TO SANITIZE TANK -HAZARDOUS MATERIAL?

  13. DFM/JP-5 TANKS -IDLH SPACE -WATER WASH -WASH FROM TOP DOWN -REMOVE SLUDGE CONTINUOUSLY

  14. APPLICATION OF CLEANING METHODS • OBTAIN CO PERMISSION TO ENTER IDLH SPACE • OPEN TANK, CONDUCT DROP TEST AND VENTILATE PER NSTM 074 • CONDUCT DROP TEST, GFE ENTER TANK USING SUPPLIED AIR BREATHING APPARATUS AND CONDUCT O2, EXPLOSIVE AND TOXIC TESTS

  15. APPLICATION OF CLEANING METHODS • DETERMINE VENTILATION/ PPE REQUIREMENTS FOR TANK CLEANING EVOLUTION • ENSURE VENTILATION/ PPE REQUIREMENTS ARE MET • PERFORM CONTINUOUS/PERIODIC ATMOSPHERIC TESTS AS NEEDED

  16. APPLICATION OF CLEANING METHODS • SOME CONSIDERATIONS WHEN TESTING DFM and J-P tanks • HYDROCARBON 2 TUBES USED TO INDICATE PRESENCE / ABSENCE OF FUEL VAPORS • NSTM 074 VOL 3 APPEN E LISTS GASES TO TEST • HYDROCARBON 2 TEST HAVE A PEL, IDLH IS N/D, IN NSTM 074 VOL 3 APPENDIX G

  17. APPLICATIONS OF CLEANING METHODS SLIPS, TRIPS AND FALLS ARE A LEADING CAUSE OF MINOR INJURIES IN TANK CLEANING OPERATIONS. • S, T & F ??? INFORM CLEANING CREW OF ANY OBSTACLES ENCOUNTERED DURING INITIAL TANK INSPECTION.

  18. GASOLINE TANKS -NORMALLY DONE BY SHIPYARD -IDLH SPACE -GAS FREE ADJACENT SPACES -MUST USE STEAM CLEANING - LEAD HAZARD? -WATER WASH

  19. INERTING, PRESSING-UP AND STEAM BLANKETING • NSTM 074 SECTION 24 • CONTAINS DETAILED PROCEDURES AND REQUIREMENTS FOR CONDUCTING EACH EVOLUTION.

  20. INERTING, PRESSING-UP AND STEAM BLANKETING • MAY BE USED WHEN HOT WORK IS REQUIRED AND NORMAL CLEANING AND GAS FREEING IS IMPOSSIBLE”EMERGENCY USE ONLY” • NOT FOR USE WITH GASOLINE TANKS • TOTALLY ISOLATE TANK FROM SURROUNDING SPACES INCLUDING COMMON VENTS AND INTERCONNECTING PIPING

  21. INERTING, PRESSING-UP AND STEAM BLANKETING • GASES USED: • CO2 (HEAVIER THAN AIR) • N2 (LIGHTER THAN AIR & PREFERRED MEDIUM) • MAINTAIN <1% O2 CONCENTRATION • WORK AREA OUTSIDE SPACE SHALL BE CERTIFIED AND MAINTAINED AS “SAFE FOR HOT WORK” • DISPOSE OF DISPLACED VAPOR AND INERTING MEDIUM SAFELY

  22. INERTING WITH N2 N2 INLET PRESSURE GAGE VENT CONNECTION NO HOTWORK WITHIN 24” OF RESIDUAL OIL 6” FROM TANK BOTTOM/ LIQUID SURFACE

  23. PRESSING-UP -EMERGENCY USE ONLY -FILL WITH WATER -ALLOW GASES TO VENT -MAINTAIN LESS THAN 1% OXYGEN -DO NOT CONDUCT HOT WORK WITHIN 12 INCHES OF WATER LEVEL

  24. STEAM BLANKETING -EMERGENCY USE ONLY -COMPLETE SAME AS INERTING -MONITOR TEMPERATURE (230 DEG MAX) -START 3 HOURS PRIOR TO HOT WORK

  25. ALTERNATE REPAIR METHODS • EPOXY-BASED COMPOUNDS • RULES OF THUMB: • MAXIMUM SYSTEM PRESSURE MAY NOT EXCEED 300 PSI • MAXIMUM TEMPERATURE MAY NOT EXCEED 2000F • ANY CHANGE OR REPAIR TO AN EXISTING SYSTEM OR COMPONENT SHOULD BE CONSIDERED A DEPARTURE FROM SPECIFICATIONS (DFS) AND REQUIRES TYCOM APPROVAL

  26. ALTERNATE REPAIR METHODS • FOLLOWING TYCOM APPROVAL • THE WORK ITEM WILL REMAIN ON THE CSMP FOR TRACKING PURPOSES AND PERMANAENT REPAIRS SHOULD BE SCHEDULED FOR COMPLETION AT THE EARLIEST OPPORTUNITY

  27. SUMMARY We described the following methods of tank cleaning: a) Hot or Cold Water Wash b) Steam Cleaning c) Butterworthing / Wheelerizing d) Chemical Cleaning e) Biological Cleaning We described the proper cleaning and testing processes for safe entry and hot work in the following types of tanks: a) Diesel Fuel Marine (DFM) b) JP-5 c) Gasoline d) Collection, Holding and Transfer (CHT) e) Closed Compartments We described the safety precautions and procedures for performing emergency hot work on tanks when proper cleaning cannot be accomplished and the following methods are used:  a) Inerting b) Pressing-Up c) Steam Blanketing

  28. REVIEW QUESTIONS What is the maximum temperature while steam cleaning? 230 degrees What is the preferred medium for inerting? Dry Nitrogen

More Related