Identify and correct source of excessive pressure
Pump seal leakage
Fluid contains solids
Provide fluid filtration; seal flush.
Ensure pump is flooded at start-up.
Consider seal quench and cooling.
Do hot alignment to reduce vibrations at operating temperature.
Valve stem leaks
Replace packing; tighten packing.
Consider bevel packing with anti-extrusion end-rings.
Heat exchanger tube leaks
Weakened connection of tube to tube sheet
Minimize thermal cycles and severity.
Consider welded, not rolled, connections.