SAFE Chooses CADWorx® and CAESAR II® for Better Mechanical Response Analysis

SAFE, a key player in the Italian oil and gas industry with its proprietary design and production of compressors, employed Intergraph CAESAR II to fix the fatigue failures of main piping and small-bore attachments, as well as the piping supports degradation in its compression skids.

Og Case Study - SAFE - SPA

The Challenge

Since 1975, SAFE has been a key player in the Italian oil and gas industry with its proprietary design and production of compressors, producing tailored and optimized solutions for the market. Presently, SAFE has an oil and gas product portfolio, which ranges from a few kW to 5000 kW machines.

While working on the project, the engineers at SAFE quickly noticed that fatigue failures of main piping and small-bore attachments, as well as piping supports degradation, were common problems associated with compression skids. This is due to high vibration levels caused by pulsation-induced forces.

This kind of pulsation can cause excessive vibrations and cyclic stresses for the skids. Therefore, SAFE quickly realized that a mechanical response analysis of the system was necessary to keep the vibration and cyclic stress levels within allowable levels to avoid fatigue failures during the early stage of the design process.


The Solution

SAFE chose CAESAR II® to perform mechanical response analysis according to the API 618 standard to avoid these challenges. CAESAR II was chosen due to its modal and harmonic analysis, and it has proven to be an efficient tool to evaluate the mechanical natural frequencies of the system (MNFs) as well as the vibration and cyclic stress levels caused by dynamic forces induced by pulsation.

SAFE also decided to adopt CADWorx® Plant Design Suite for its ease of use and flexibility. SAFE used CADWorx Plant Professional to easily create compression skid 3D models, including piping lines, steel structures, and equipment.

SAFE received a variety of benefits, including:

  • Less error-prone model building due to the accuracy of CAESAR II.
  • Easy management of wide and complex piping systems from design and calculation points of view.
  • The possibility to easily evaluate possible new solutions to deal with the problems induced by high pressure pulsations.

CADWorx and CAESAR II allowed SAFE to consider all of the internal and external factors affecting the MNFs of the piping systems, such as flexibility and stiffness of structures and pipe supports, as well as nozzle flexibilities.