Ram blowout preventers (BOPs) can be classified based on the number of ram sets installed per unit into: single-ram, double-ram, and triple-ram BOPs, which are equipped with one, two, or three pairs of rams respectively. According to the actuation method of the rams, they can be divided into hydraulic ram BOPs and manual ram BOPs. Based on the locking mechanism of the rams, they can be categorized into manually locked and hydraulically locked types. According to the opening and closing methods of the side doors, there are two types: rotating side-door ram BOPs and linear-motion side-door ram BOPs. For rotating side-door ram BOPs, when the side door is opened or closed, it rotates around a hinge seat fixed to the housing. The longitudinal cross-section of the housing cavity perpendicular to the ram axis is rectangular. For linear-motion side-door ram BOPs, when the side door is opened or closed, it moves linearly along two piston rods fixed to the housing for side-door opening and closing. The longitudinal cross-section of the housing cavity perpendicular to the ram axis is oblong.
Note: "U" type belongs to the forged structure, while "LWS", "SL" and "lightweight" types belong to the cast structure.
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