▁three ▁Admir alty ▁ 3 - d rum ▁water - t ube ▁bo ilers . ▁H ast y ▁carried ▁a ▁maximum ▁of ▁ ▁of ▁fuel ▁oil ▁that ▁gave ▁her ▁a ▁range ▁of ▁ ▁at ▁. ▁The ▁ship ' s ▁complement ▁was ▁ 1 3 7 ▁officers ▁and ▁men ▁in ▁pe ac etime , ▁but ▁this ▁increased ▁to ▁ 1 4 6 ▁in ▁w art ime . ▁ ▁The ▁ship ▁mounted ▁four ▁ 4 5 - cal ib re ▁ 4 . 7 - inch ▁( 1 2 0   mm ) ▁Mark ▁IX ▁guns ▁in ▁single ▁mount s . ▁For ▁anti - air craft ▁( AA ) ▁defence , ▁H ast y ▁had ▁two ▁quad ru ple ▁Mark ▁I ▁mount s ▁for ▁the ▁ 0 . 5   inch ▁V ick ers ▁Mark ▁III ▁machine ▁gun . ▁She ▁was ▁fitted ▁with ▁two ▁above - water ▁quad ru ple ▁tor ped o ▁t ube ▁mount s ▁for ▁ ▁tor ped o es . ▁One ▁depth ▁charge ▁rail ▁and ▁two ▁throw ers ▁were ▁fitted ; ▁ 2 0 ▁depth ▁charges ▁were ▁originally ▁carried , ▁but ▁this ▁increased ▁to ▁ 3 5 ▁shortly ▁after ▁the ▁war ▁began . ▁ ▁Begin ning ▁in ▁mid - 1 9 4 0 , ▁the ▁ship ' s ▁anti - air craft ▁arm ament ▁was ▁increased , ▁although ▁when ▁exactly ▁the ▁modifications ▁were ▁made ▁is ▁not ▁known . ▁The ▁rear ▁set ▁of ▁tor ped o ▁tub es ▁was ▁replaced ▁by ▁a ▁ ▁AA ▁gun ▁and ▁the ▁quad ru ple ▁. 5