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API 6A Crossover Wellhead Spool with Side Outlets
Crossover flange stress qualification and side outlet intersection integrity verification under 51.7 MPa factory hydrotest.
Wellhead crossover adapter spools bridge different bore diameters between casing heads and blowout preventer (BOP) stacks while accommodating side auxiliary lines. Large internal pressure acting on the intersection of the main vertical bore and perpendicular studded side outlet bores induces significant hoop stress concentrations. This calculation validates the structural capacity of the forging and the reinforcing gusset ribs during the mandatory API 6A 51.7 MPa pressure proof test.
1. Geometry & FEA Mesh
- •Quenched and tempered alloy steel AISI 4130 (yield strength 517 MPa, E = 205 GPa, ν = 0.29).
- •Asymmetric 11" (279 mm) lower flange transitioned to 7-1/16" (179 mm) upper flange with BX-158 ring gasket grooves.
- •Two diametrically opposed 2-1/16" studded side outlet blocks reinforced by 4 cast triangular gusset ribs.
- •3D solid mesh comprising 141,600 tetrahedral elements and 106,200 active degrees of freedom.
2. Loads & Boundary Conditions
- •Fixed axial and rotational constraint applied around the 16 stud hole seats of the lower 11" 5K flange.
- •Uniform internal hydrostatic test pressure P = 51.7 MPa (7,500 psi) applied across all internal flow passages and side outlet bores.
- •Axial blind-flange pressure thrust reaction of 1.30 MN applied to the upper flange sealing ring gasket counterbore.
3. Simulation Results & Findings
- ✓Peak von Mises stress σ_vm = 291.9 MPa located at the internal crotch blend radius between the main bore and the side outlet port.
- ✓Maximum displacement magnitude |u| = 0.111 mm located at the outer rim of the upper transition flange.
- ✓Safety factor SF = 1.77 against yield strength, confirming robust safety margins well above API Spec 6A allowable stress limits.
Wellhead engineering suppliers use WebCAE to validate custom adapter spools and crossover configurations directly in their browsers during customer tendering. Instant FEA results eliminate third-party analysis delays and prevent costly fabrication non-conformances.
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