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A loading arm permits the transfer of liquid or liquefied gas from one tank to another through an articulated pipe system consisting of rigid piping and swivel joints to obtain flexibility. Transfer to or from a truck transported tank or rail transported tank requires a Top Loading Arm or a Bottom Loading Arm. Transfer to or from a ship or barge requires a marine loading arm. ==Top and Bottom loading arm== * ''General feature of Top and Bottom loading arms'' Both types of loading arms are typically made of 3 pipes – respectively called inner arm, outer arm and drop pipe. The size can be from 2” to 6”. These 3 pipes are connected by swivel joints. Swivel joints are required to provide the flexibility needed. The loading arm unfolds to get the required working envelope to load or unload the tanker, and the reverse is to retract or get a minimal space for parking or storage. Both types of loading arms may be mounted on a column or via a plate to an existing wall. Balancing is needed due to the weight of the steel piping. Balancing of the arm is made by counterweight or by a spring balance cylinder. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「loading arm」の詳細全文を読む スポンサード リンク
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