Open Access

Table 1

Strength criteria of operability envelopes for parallel strings (DNV-OS-F201, 2010).

Limiting factors Restrictive conditions
The maximum equivalent stress of the riser/yield strength 0.80
The maximum equivalent stress of the string/yield strength 0.67
Maximum bending moment of wellhead/yield strength 0.80
The maximum deflection angle of the string
The maximum deflection angle of the riser

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