API-650 Table 5-21

I received a reply on my concern with the formulas in Table 5-21a for SI units and it is agreed that the formula is wrong when pressure is included in the calculations. They are now trying to determine what is the easiest and fastest way to make the corrections. In my program, ITSdesign, I will use the factor of 785 instead of 0.785 for the pressure. This revision will be included in the release I will do this weekend. There is a possibility this change could make it into Addendum 1 but I kind of doubt it. Maybe they will release an errata sometime soon after Addendum 1 is released. I have not seen the proof copy of Addendum 1 so am still wondering when it will end up being released. I will keep you informed on this.