本文件规定了安装用于引导船舶系泊和拖缆的巴拿马楔块座椅的类型、标称尺寸、尺寸和材料，以及结构、制造和标记要求。它适用于通过巴拿马运河的船舶，通常由使用钢制拖缆的机车和/或拖轮辅助。这些止动块座满足正常系泊要求和巴拿马运河要求。 注:巴拿马Plus和Neopanamax船舶的巴拿马垫块（SWL为90吨）阀座可替换为封闭垫块的阀座（见ISO 23113）。

This document specifies the types, nominal sizes, dimensions and materials, as well as construction, manufacturing and marking requirements, for the seats for Panama chocks installed to lead the mooring and towing rope of a ship. It is applicable to ships passing through the Panama Canal, which are normally assisted by locomotives using steel towing wires and/or by tug boats. These seats for chocks meet normal mooring requirements and Panama Canal requirements. NOTE The seat for Panama chocks (SWL of 90 tons) for Panamax Plus and Neopanamax vessels can be replaced by seats for closed chocks (see ISO 23113).