1. Applicable to connection at locations when drill platform, semi-submersible drilling vessel or drill vessel moves relatively and the installation dimensions of the drill rig subsequently change, and to delivery of oil, gas, mud and other high pressure media(including mainly relief line, blowout control line and choke kill line.) 2. Applicable standard: API Spec 16C. 3. The product features resitance to high preesure, thermal insulation, anti-flaming and fire resistance as well as inner wall with high abrasion resistance.
