The engineering task
An existing flanged joint leaks after thermal cycles or a few operating hours. Increased tightening torque has already been tried without reliably removing the cause. Potential drivers include insufficient residual gasket stress, unsuitable gasket data, flange rotation, bolt relaxation, excessive piping loads or excessive assembly-preload scatter.
The upgrade must not be reduced to indiscriminate retightening. Reconstruct the actual load path first, then vary gasket, bolts, flange and assembly method individually. The objective is a demonstrable preload window that remains robust under realistic scatter.
Required design data
- As-built geometry and recorded assembly values
- Leak timing plus pressure and temperature history
- Gasket data and sealing-surface condition
- Piping loads, preload scatter and relaxation assumptions
Technical solution approach
Structure the evidence
Relate leakage pattern, assembly record and operating history to a likely failure mechanism.
Recalculate the as-built joint
Reproduce the existing connection to EN 1591-1 with realistic preload and loads.
Study sensitivities
Vary gasket, bolts, external loads and preload scatter individually to identify the dominant cause.
Compare upgrade options
Quantify changed gasket, stronger or more flexible bolts, reduced piping loads and controlled assembly.
Specify the upgrade
Document the most robust option with assembly window, surface requirements and acceptance criteria.
Expected deliverables
Suitable SOL ALPHA modules
The modules form a technically plausible toolchain. Their final selection and sequence will be confirmed during the later calculation against the applicable code and project conditions.