Marine Boiler - Operational Pressure Check
Verify boiler operating pressure against design pressure, safety valve set point and classification limits.
Formula, assumptions, limits
Operating pressure must remain below design pressure with reasonable margin. Safety valve set typically at design pressure (some class rules allow up to 1.05 x design). Hydrostatic test at 1.5 x design at construction. Operating beyond design pressure is forbidden under classification society rules and indicates need for immediate shutdown and investigation. Margin below 5 percent of design typically indicates unusual operating condition; margin below 0 indicates over-pressure event.
Symbol legend
SymbolMeaningUnitSource
Boiler design pressurebar(g)nameplate Current operating pressurebar(g)gauge Safety valve set pressurebar(g)SV stamp
In short
Verify boiler operating pressure against design pressure and safety valve setting.