Well done Pete. Out of interest how long is the kit? I could work out out but it's late!!!
Also I saw an interesting documentary on this a year or so ago and discovered that she she was fighting a fire in one of the huge coal bunkers even before she left Southampton and even possibly Belfast, which apparently weakened the already below par steel used due to budget constraints.
And that (IIRC) because so much coal was burned by the fire and also in the furnaces In an attempt to put the fire out, she probably didn't have enough coal left for her to slow down through the danger area where they were likely to encounter icebergs and then build up speed again to make it to America. So she had to go through faster than normal.