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<p>In deep-sea mining systems, the connection speed of connectors significantly impacts the efficiency of offshore deployment and retrieval operations. For deep-sea mining risers, a quick connector has been designed to enable rapid connection and disconnection. The extreme loads that the connector may encounter during operation were calculated, and finite element analysis was employed to evaluate the stresses on various connector components as well as the sealing reliability. The results demonstrate that under extreme sea conditions, the maximum working load on the connector occurs at a depth of 9&#xa0;m below the sea level. The maximum equivalent stress is 447&#xa0;MPa, occurs at the contact surface of the locking blocks of the sleeve, with all stresses remaining within permissible limits. While the O-ring seal outperforms the Y-ring seal in static sealing under high pressure, an anti-extrusion ring should be fitted on the low-pressure side to manage the elevated shear stress. This addition reduces the maximum shear stress at 30&#xa0;MPa to less than one-third of the original level. For O-ring seal with an anti-extrusion ring, a higher initial compression ratio is recommended from the perspective of enhancing the service performance.</p>

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Load-bearing and sealing performance analysis of quick connectors for rigid mining pipes

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Rongyao Wang,
  • Yongjie Zhu,
  • Yi Tu,
  • Wen Liu,
  • Xiaogao Yang,
  • Songrong Luo

摘要

In deep-sea mining systems, the connection speed of connectors significantly impacts the efficiency of offshore deployment and retrieval operations. For deep-sea mining risers, a quick connector has been designed to enable rapid connection and disconnection. The extreme loads that the connector may encounter during operation were calculated, and finite element analysis was employed to evaluate the stresses on various connector components as well as the sealing reliability. The results demonstrate that under extreme sea conditions, the maximum working load on the connector occurs at a depth of 9 m below the sea level. The maximum equivalent stress is 447 MPa, occurs at the contact surface of the locking blocks of the sleeve, with all stresses remaining within permissible limits. While the O-ring seal outperforms the Y-ring seal in static sealing under high pressure, an anti-extrusion ring should be fitted on the low-pressure side to manage the elevated shear stress. This addition reduces the maximum shear stress at 30 MPa to less than one-third of the original level. For O-ring seal with an anti-extrusion ring, a higher initial compression ratio is recommended from the perspective of enhancing the service performance.