WITSML - Blow Out Preventer Component Schema. Type of ram/preventer. Description of component. Inner diameter that tubulars can pass thru. Working rating pressure of the component. Minimum diameter of component it will seal. Maximum diameter of component it will seal. Arrangement nomenclature for the Blow Out Preventer stack (e.g. S, R, A). Is Ram bore variable or single size? Defaults to false. Values are "true" (or "1") and "false" (or "0"). Unique identifier for the Blow Out Preventer Component.