page_title: Cameron ram-type blowout preventer
section_title: Design
hierarchical_section_title: Cameron ram-type blowout preventer / Design
caption_attribution_description: English: Cameron Ram-type Blowout Preventer (1922) U.S. Patent 1,569,247. Text was removed from figure and minor cleanup of the scan was done with Microsoft Paint.
context_page_description: The Cameron ram-type blowout preventer was the first successful blowout preventer for oil wells. It was developed by James S. Abercrombie and Harry S. Cameron in 1922. The device was issued U.S. Patent 1,569,247 on January 12, 1926. The blowout preventer was designated as a Mechanical Engineering Landmark in 2003.
context_section_description: The blowout preventer is a T-shaped coupling that is screwed onto the top of the casing. It has a passage through the coupling for the drill string. There is a ram with a concave, semi-circular face in each arm of the tee. Each ram is moved in or out by turning its valve stem, which extends beyond the coupling. The ends of the stems are squared off.
  When the rams are retracted, there is a passage for the drilling mud. If a blowout begins, the drill string is stopped. Then wrenches are used to manually close the rams around the drill string to seal the wellbore. The MO BOP was tested to withstand 3,000 pounds per square inch (21,000 kPa).
  The device had a lateral valve below the rams on its bottom section. In case of a blowout, a mud pump could be used to pump drilling mud into the wellbore to control the blowout.
caption: Plan view of the Cameron BOP
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