RCID

Subsea Valve

Product

A major supplier of valves for oil and gas duty asked the RCID to assess its latest design against the requirements of an oil major and classification society.

Assessment

The study was required to determine the deflection under load of seating components within the valve and also to check the body at the design internal pressure together with imposed pipe loads (moments, axial loads and torques)

Detailed 3D models of the valve components were created in Pro/Engineer. These were then analysed using Pro/Mechanica and COSMOSworks software.

The loads needed to be considered in various combinations of design and extreme conditions and with the valves open and shut. External sea pressure, ROV docking loads and stem actuation forces also needed to be taken into account.

The stresses were compared to those allowed for the material used including an assessment against the stress intensities given in ASME VIII Div 2. The deflections of the seating components were calculated in a contact analysis which indicated good sealing at these critical parts.

The results were presented in a series of detailed reports which showed the designs were suitable under the specified conditions.

Outcome

The RCID analysis showed that the product was fit for service and provided the required independent view on the clients design.