Ram blowout preventers (BOPs) can be classified by the number of ram sets installed in each unit into: single-ram, double-ram, and triple-ram blowout preventers. They are equipped with one, two, or three pairs of rams respectively. Ram blowout preventers can be divided into hydraulic ram blowout preventers and manual ram blowout preventers according to the ram opening and closing mode. Based on the ram locking method, ram blowout preventers can be categorized into manual locking and hydraulic locking types. According to the different opening and closing modes of the side doors, ram blowout preventers can be divided into two types: rotating side-door ram blowout preventers and linear-motion side-door ram blowout preventers. For rotating side-door ram blowout preventers, when the side door is opened or closed, it rotates around a hinge seat fixed on the housing. The longitudinal cross-section of the housing cavity of this type of preventer, perpendicular to the ram axis, is rectangular. For linear-motion side-door ram blowout preventers, when the side door is opened or closed, it moves linearly along two piston rods (for opening and closing the side doors) fixed on the housing. The longitudinal cross-section of the housing cavity of this type of preventer, perpendicular to the ram axis, is oblong.
Note: The "U" type features a forged structure, while the "LWS", "SL" and "lightweight" types adopt a cast structure.
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