This technical monograph by R. Guillet explores the intersection of hygrometric combustion diagrams and water steam pump systems. Published in French, the work delves into the thermodynamic principles governing steam generation and pump operation, with a focus on the graphical representation of hygrometric properties in combustion processes. The 298-page volume provides detailed analysis and engineering insights relevant to mechanical and thermal engineering disciplines, particularly those concerned with energy systems and fluid dynamics. It serves as a specialized reference for researchers and engineers working in the field of thermal machinery and combustion technology.