For new skid designs, a dynamic analysis is often required to resolve a vibration problem. In addition to the dynamic analysis, other design criteria must also be addressed.
SKID DESIGN CHALLENGES
The majority of compressor and pump packages are now mounted on steel skids or baseplates. Designing a skid for a new machinery package can be challenging because of these factors:
- The skids must be designed to avoid resonance and vibration (from dynamic machinery and unbalanced forces and couples).
- The industry is looking for lower-cost packages. This can cause suppliers to reduce the skid cost which often results in a detrimental decrease in skid stiffness. But an inappropriately designed skid will create vibration and reliability problems. In some cases, skids are considered too flimsy for the required application.
- New designs must consider loading, lifting, and transportation issues, as well as weight limitations. Pedestal height can also cause problems.
- Environmental loads such as wind, wave, and seismic activity must meet a variety of different codes and standards.
SKID DESIGN SOLUTIONS
Two commonly required skid studies are performed to address the above challenges. These engineering requirements must be specified (by the owner or EPC) to ensure they are included in the project.
Lifting, Environmental, and Transportation Studies. These studies will ensure the skid can be lifted, transported to site, and withstand environmental loads such as those induced by the wind or an earthquake. Skid applications will need to meet industry codes and customer specifications for these loads.
- Dynamic Skid Analysis. The study is focused on rotating or reciprocating machines. It will assess the vibration and dynamic stress amplitudes in the skid structure and components mounted on the skid to identify if modifications are required.
For many packagers, Wood can also help reduce the cost of the skid (Skid Optimization Study). Contact us for further information on ways to reduce unnecessary costs (labor and materials).
