Gas venting floating cover

A gas venting floating cover for a liquid container wherein said cover includes a sheet of flexible material for lying upon the contained liquid and for attachment to the container sides in fluid tight relationship, the sheet having excess material at its perimeter to form into a depending fold;

• flotation means attached to said cover and defining gas collection spaces for receiving gases evolving from said liquid;
• and gas collection means for receiving and carrying away gases collecting in said collection spaces, said cover being characterized in that:
• said flotation means comprises generally parallel first and second strings of floats spaced apart to define a longitudinal passage, certain of said floats in each of said first and second strings defining transverse passages in communication with said longitudinal passage;
• connecting means extending between and connecting together said first and second strings and preventing said first and second strings from moving apart;
• and,
• said gas collection means comprises a conduit resting upon and mounted between said first and second strings in coextensive, overlying relation to said longitudinal passage, said conduit being buoyed in substantially stable relation by said first and second strings, said gas collection means further comprising flexible connector means and piping coupled to said conduit for bridging the perimetrical fold in said sheet of said cover.