on the port and starboard hull sections excessive athwart ship 39 s movement of the support systems due possibly to vertical shock loads relative to the hull is limited by means of side rail snubbers 37 built upon the hull tank 35 in another aspect of this invention there is mounted a fore 34 a 34 41 frame and an aft 34 a 34 frame 43 within the hull of the ship these 34 a 34 frames do not carry vertical load but rather contribute to athwart ship 39 s stability on the support system as is shown in fig3 channel members 45 proximate to a girder and an 34 a 34 frame and fixed to the girder straddle a central beam or gib key 47 fixed to the 34 a 34 frame whereby athwart ship 39 s motion is restrained while vertical and axial movement of the support system relative to the 34 a 34 frame is free and non loading it is clear that the girders 25 are supported only at each end with respect to vertical loads and that no vertical support is encountered at the centerline of the system the side walls 51 of the support system are one half inch plate and together with the top side or deck 29 constitute a portion of a condenser integral with the support system the condenser further includes end caps 57 which.