Petroleum Well Control Equipment Co., Ltd. (PWCE)
Abubuwan da aka bayar na PWCE Express Oil and Gas Group Co., Ltd.
Abubuwan da aka bayar na Seadream Offshore Technology Co., Ltd.
Ƙungiyar tarawa ta BOP (wanda kuma aka sani da rukunin rufewa na BOP) yana ɗaya daga cikin mahimman abubuwan da ke hana busawa. Ana sanya masu tarawa a cikin tsarin hydraulic don manufar adana makamashi don fitarwa da canjawa wuri cikin tsarin lokacin da ake buƙata don cika takamaiman ayyuka. Raka'o'in tarawa na BOP kuma suna ba da goyan bayan injin ruwa lokacin da canjin matsa lamba ya faru. Waɗannan sauye-sauye suna faruwa sau da yawa a cikin ingantattun famfunan ƙaura saboda ayyukansu na tarko da murkushe ruwa.