Learn more about PASS/START-PROF pipe stress analysis software
Modular design divides complex piping systems into transportable modules mounted on frame structures. These modules are fabricated off-site, transported, and assembled into the complete system. The diagram below shows a typical module with connection points "1" for external piping or adjacent modules.
Stress analysis of individual modules for thermal expansion and system-wide loads requires evaluating the entire assembled system. Analysis of isolated modules is only feasible with fixed anchors at all connection points, which complicates thermal expansion design.
Practical analysis approaches include:
Option 1. The module manufacturer performs stress analysis using multiple worst-case external piping scenarios. After successful verification, the PASS/START-PROF module model is delivered to the customer for integration into the full system model.
Option 2. The customer adds fixed anchors or moment-free supports at module connection points, optimizes the design, and delivers the model to the manufacturer. The manufacturer then integrates both models for complete system analysis.
Both options require transportation stage analysis. Configure the system for transport (locked springs, temporary supports, detached flanges) and analyze for inertial loads, vehicle deformation, and environmental conditions including ice, snow, wind, and impact loads.