VRV AND VENTING CALCULATIONS DESIGN OF LIFTING TRUNNIONĭESIGN DATA API STANDARD 650 TENTH EDITION, NOVEMBER 1998 ADDENDUM 4, DECEMBER 2005 APPENDICES: J, M & Sįlat Roof Design Item No.
API 650 TANK CALCULATION SPREADSHEET VERIFICATION
1 2 3 4 5 6 7 8 9 9.1 10 11 12 13 14 15ĭESCRIPTION DESIGN DATA CALCULATIONS FOR MINIMUM SHELL THICKNESS BOTTOM PLATE DESIGN INTERMEDIATE WIND GIRDER VERIFICATION OF UNSTIFFENED SHELL FOR EXTERNAL PRESSURE DESIGN OF ROOF CALCULATION OF ROOF STIFFENER TANK STABILITY AGAINST UPLIFT DUE TO INTERNAL PRESSURE STABILITY OF TANK AGAINST WIND LOADS RESISTANCE TO SLIDING SEISMIC CALCULATION ANCHORAGE FOR UPLIFT LOAD CASES ANCHOR CHAIR CALCULATION WEIGHT SUMMARY FOUNDATION LOADING DATA EVALUATION OF EXTERNAL LOADS ON TANK SHELL OPENINGS AS PER P.3 OF API 650, ADD. Are they thicknesses before or after corrosion? Some calculations seem to imply that they are before corrosion, other calculations seem to imply that they are after corrosion.SR. Not a trivial task either.Īs a separate side note, there is a question as to the input thicknesses. No adding of lengths in meters to lengths in millimeters. The calculation of L cri might include a hidden factor of the density of water, which is, in some common units, just one.īut if you don't do that then you have to manually verify, for every calculation, that not only are the dimensions correct but also that the units are compatible. Often the given constant is a combination of a number of meaningful physical quantities. But better would be to go back to the derivations of the equations and determining the proper units from there. You can do that simply by adding units that cancel the input units and add the output units. To get correct equations these missing units must be restored.
The problem is that many of the constants in the formulae have, in fact, units, units which are unstated but implied by the units for the variables. I quite understand that including units in a calculation that was done without units is not a trivial task.
If including units causes the answers to change, then either the inclusion of units was done incorrectly (the empirical equations were not properly adjusted) or the answers calculated without units were wrong. 697m (the unit is wrong rather than the value) it is still adding just a small amount. 697mm it is not just small, it is negligible - way smaller than your tolerances, or probably your measurement errors. The only difference is the size of the numbers.Ĭonsidering that you are working with lengths on the order of meters (about 20, overall) if L cri is indeed. Both large and small lengths can be expressed in either meters or millimeters. You cannot (meaningfully) add a number of meters to a number of millimeters.
It makes no difference whether it increases the design liquid by a large amount or a small amount.