STS outreach

STS outreach is the horizontal distance a ship-to-shore crane’s boom and trolley can reach seaward of the waterside crane rail, measured from that rail to the outermost trolley position over the ship. It is stated in container rows because it must span the beam of the largest ship the berth serves: a Panamax crane reaches about 13 rows, a post-Panamax 18, and a super-post-Panamax crane for an ultra-large container vessel 22 to 25 rows, roughly 60 to 70 meters. Outreach with backreach, lift height, and rail gauge defines the crane envelope and fixes the wheel loads and rail beams the quay must carry. Growth in ship beam drives the outreach race and the quay structures behind it.