DOT_Design_Check_List    

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DOT 400 SERIES TANKS - DESIGN CHECK-OFF LIST

THIS CHECK-OFF LIST OUTLINES THE COMPONENTS OF A MINIMUM DESIGN PACKAGE FOR A PARTICULAR CARGO TANK AND INCLUDES ACCIDENT DAMAGE PROTECTION AND STRUCTURAL INTEGRITY.

LOAD CONDITIONS NEED TO BE CHECKED FOR WORST CASE CONDITIONS INCLUDING: a) FULLY LOADED TANK WITH COMPARTMENTS LOADED IN WORST CASE OPERATING CONDITIONS; b) PRESCRIBED VACUUM CONDITIONS WITH PARTICULAR LOAD (NOT REQUIRED FOR DYNAMIC LOAD CONDITIONS).

  1. STRUCTURAL INTEGRITY CALCULATIONS

    1. STATIC LOAD CONDITIONS WITH FULL TANKS AND MAXIMUM INTERNAL PRESSURE

    2. DYNAMIC LOAD CONDITIONS WITH .35G VERTICAL SURCHARGE, .35G LONGITUDINAL SURCHARGE AND .2G LATERAL LOAD DISTRIBUTED. THE LONGITUDINAL FORCE SHALL BE APPLIED SEPARATELY AS ACCELERATIVE AND DECELERATIVE AT WHEELS AND FIFTH WHEEL.

    3. DYNAMIC .7G VERTICAL SURCHARGE DISTRIBUTED

    4. WORST CASE CONDITION FOR A TANK SUBJECT TO .7G LONGITUDINAL FORCE IN BOTH ACCELERATIVE AND DECELERATIVE CONDITIONS AND APPLIED 1) ENTIRELY AT FIFTH WHEEL AND 2) ENTIRELY AT REAR WHEELS. FOR TRUCK MOUNTED TANKS, THE LONGITUDINAL LOADS SHALL BE APPLIED AT THE MOUNTS.

    5. A FULLY LOADED TANK SUBJECT TO A DISTRIBUTED TRANSVERSE FORCE OF .4G APPLIED AT THE CENTER OF GRAVITY OF THE TANK AND RESISTED BY THE FRONT AND REAR SUPPORTS.

    6. AN EMERGENCY DECELERATIVE LOAD OF 2G APPLIED TO THE TANK AND RESISTED BY UP TO FOUR HEADS OR BAFFLES. A DESIGN STRESS OF UTS/1/3 IS ALLOWED FOR THIS CONDITION. THE OTHER LOAD CONDITIONS ARE AT CODE ALLOWABLE STRESSES.

    7. CALCULATIONS VERIFYING THE ADEQUACY OF THE SUPPORT SADDLES, RINGS AND BRACKETS UNDER WORST LOAD CONDITIONS INCLUDING THOSE INVOLVED IN SUPPORTING EXTERNAL WEIGHTS SUCH AS PUMPS ATTACHED TO THE TANK .

  2. REAR END PROTECTION CALCULATIONS

    1. REAR BUMPER DESIGNED FOR 2G REAR LOAD APPLIED ANYWHERE FOR 0 DEGREES TO LONGITUDINAL AXIS OF THE TANK TO 10 DEGREES FROM THAT AXIS.

    2. BUMPER MOUNTING ARMS MUST BE DESIGNED TO RESIST BENDING MOMENTS CAUSED BY ECCENTRIC MOUNTING.

  3. BOTTOM DAMAGE PROTECTION CALCULATIONS

    1. DESIGN OF PROTECTIVE STRUCTURES.

    2. CALCULATION OF LOCAL STRESSES AT TANK PRESSURE BOUNDARIES DUE TO LOADS FROM BOTTOM DAMAGE PROTECTIVE STRUCTURE INCLUDING SHELL, RINGS AND SADDLES.

    3. IF WHEEL ATTACHMENTS OR OTHER ELEMENTS ARE USED FOR ABSORBING BOTTOM DAMAGE PROTECTION LOADS, CALCULATIONS JUSTIFYING THEIR USE, INCLUDING STRESSES INDUCED IN THE TANK PRESSURE BOUNDARY, ARE REQUIRED.

  4. OVERTURN PROTECTION CALCULATIONS

    1. DESIGN OF OVERTURN PROTECTIVE STRUCTURES.

    2. DESIGN AND CALCULATION OF STRESSES IN PRESSURE BOUNDARY DUE TO OVERTURN LOADS AND INCLUDING SUPPORT PADS, RINGS AND BAFFLES.

    3. IF A FITTING IS DESIGNED TO PROTECT ITSELF, CALCULATIONS OF FITTING AND PRESSURE BOUNDARY STRESSES ARE REQUIRED.

  5. OTHER DESIGN CHECKS

    1. STRESSES IN PRESSURE BOUNDARY AND STIFFENERS AND PADS DUE TO EXTERNAL PIPING AND HEAVY ATTACHMENT LOADS.

    2. SPRING LOADED ATTACHMENT DESIGN

TEST RESULTS MAY BE USED IN LIEU OF CALCULATIONS UNDER APPROPRIATE CONDITIONS.

 

 

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Last modified: October 13, 2005