+1 vote
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Flange Type connectors or Pin and Box type connectors for Riser Joints?

asked Sep 10, 2014 in Subsea by cuchiang (2,310 points)
What is your take on the "Flange Type Connectors" and "Pin and Box Type Connectors" for Riser Joints?

4 Answers

+1 vote
answered Sep 10, 2014 by lulopez (2,220 points)

Well, Flange Type Connectors and Pin and Box Type Connectors are 2 complete different designs even though they are both used for Riser Joints. However, you should use either all Flange Type connectors or all Pin and Box type connectors.

+1 vote
answered Sep 10, 2014 by lulopez (2,220 points)
Flange type drilling riser connectors should be designed and manufactured to API 16Q and API Spec 16F and should have corrosion resistant metal cladding overlay bore seal area profiles and metal-to-metal, re-useable seals with appropriate joint bending moment applied including any other external loads.

The connector should be high strength, low stress, easy make and break, and low weight characteristics.  The box-up riser connector should have a profile to accept a quick makeup and breakout running tool.  Depending on the specific connector design, it should include high strength locking bolts or dogs with corresponding threaded inserts or any other equivalent means of locking the riser box to the pin.  Connector design should include sufficient connector preload to minimize fatigue.
+1 vote
answered Sep 10, 2014 by lulopez (2,220 points)

Pin and box drilling riser connectors should be weld-on type with the following characteristics:

  • Low stress amplification factor for fatigue resistance.
  • Testing should use the API RP 5C5 Test Class III or ISO DIS-V2 13679 AL III procedures as a guideline. The number of samples need not conform to API RP 5C5 or ISO DIS-V2 13679.
  • Have a weld neck of sufficient length such that the weld does not see the connector stress field.
  • Load shoulder capable of supporting 1.5 x max riser string weight.
  • Make up preload sufficient to prevent separation at external loads up to 80% of pipe yield.
  • Makeup should develop sufficient axial interference to prevent loss of preload under cyclic loading (including mean load).
  • Makeup should develop sufficient interference to prevent breakout under cyclic torsional loading (including mean load).
  • Metal-to-metal internal and external seals, to keep bore fluids in and seawater out.
  • Have rugged threads and seals, suitable for up to 25 make/break cycles as demonstrated through testing.
  • Make up and break out using available rig tong equipment.
  • Be provided with rugged thread and seal protectors, (preferably metal rather than plastic), suitable for reuse in the field.
+1 vote
answered Sep 12, 2014 by Normandy (21,040 points)

 

 


* Illustrations taken from GMC Mechanical Connector

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