The heart of the tensioner system is the pull-up cylinder/accumulator assembly. The unitized assembly is comprised of a hydro-pneumatic cylinder, an external high-pressure accumulator, a low-pressure accumulator, and upper and lower-end connections.


All Dril-Quip Tensioning Systems feature the same highly-engineered, reliable and field-proven materials and components:

  • Design life of 20-25 years
  • Designed with the capability of operating in all riser modes with one cylinder out
  • Low volume hydro-pneumatic cylinder takes advantage of a patent pending feature to minimize the size of the external accumulator
  • Cylinder Barrel ID sealing surfaces are plated with engineered hard chrome for long life
  • Seals are a redundant, dual, elastomeric arrangement for long-life, high-pressure sealing
  • Pressure relief devices are connected to accumulators to prevent over-pressurization of the cylinder accumulator assembly
  • Stainless steel plumbing between the cylinders and the accumulators
  • Dril-Quip offers two types of riser tensioning systems: pull-up style and Ram (push-up) style

Pull-up Style Tensioner

The heart of the tensioner system is the pull-up cylinder/accumulator assembly. The unitized assembly is comprised of a hydro-pneumatic cylinder, an external high-pressure accumulator, a low-pressure accumulator, and upper and lower-end connections.

  • Offers benefits of traditional, field-proven, pull-up tensioner designs with up to 10° of angular misalignment between the riser and the hull
  • Solid bar rod has external surfaces cladded with a field-proven, cobalt-based alloy that is impervious to drilling/completion fluids and salt water spray