TTS Marine's side rolling hatch covers for OBO, ore or oil or similar types of ship ensure that all the requirements of the owners and regulatory authorities in respect of the manoeuvring, cleating and tightening of the hatch cover panels can be met in full. TTS Marine GmbH side rolling hatch covers are of a simple, but cost-effective construction and are designed both to fulfil the UR S21 rules from the International Association of Classification Societies (IACS), and class requirements towards flooded holds considering head pressures from liquid cargo for restricted or unrestricted filling from internal load and sloshing forces for holds in OBO vessels.