Blowout Preventers

The U blowout preventer is designed so that hydraulic pressure opens and closes the rams and provides themeans for quick RAM change-out.RAM closing pressure closes the rams. When the bonnet bolts are removed, closing pressure opens thebonnet. After the bonnet has moved to the fully extended position, the RAM is clear of the body. An eyebolt canbe installed in the top of each RAM to lift it out of the preventer.RAM opening pressure opens the rams. Following RAM change-out, this pressure closes the bonnets. The rams are pulled outward, near the bonnets, before the bonnets begin moving toward the preventer body. Thisassures that the rams never obstruct the bore or interfere with the pipe in the hole. Hydraulic pressure drawsthe bonnets tightly against the preventer body and the bonnet bolts are reinstalled to hold the bonnets closed.The Srical blowout preventers are compact, annular type BOPS which seal reliably on almost any shape Or size kellys, drill pipe, tool joints, drill collars, casing or ricals also provide positive pressure Control for stripping drill pipe into and out of the hole, They are available in bolted cover, wedge cover models.There are also special lightweight models for airlifting and Arctic models for low temperature service.SPECIAL FEATURES _ CENTRUM SRICAL BOPSRugged, reliable sealing positive seal after hundreds of tests to full working pressure Strong, simple construction _ only five major parts.Compact body saves space. Height is 15 to20% less than height of some other annular BOPS.Simple hydraulic system. Only two hydraulic Connections are needed.Wear rings on moving parts prevent metal-to- metal This feature prolongs preventer life.Suitable for H2S service. Standard models are suitable for internal H2S service, and simple bolt And Lifting shackle changes convert them for external H2S service.Special lightweight models can be carried by helicopter.Servicing is easy. anged without getting mud or grit into the hydraulic System.Steel segments reinforce sealing t protrude into well bore when br>ovides long stripping life.