\documentclass[tikz,border=6pt]{standalone}
\usepackage{luacoolprop}
\pgfplotsset{compat=1.18}
\pgfplotsset{auto node allow outside=true,
  auto node failure mode=hide-low-priority}

\begin{document}
\LCPHSDiagram[
  fluid=Water,
  pressure min=1000,
  pressure max=30000000,
  quality step=0.2,
  isochore=true,
  specific volume values={0.0015,0.01,0.1,1,10},
  isotherm=true,
  temperature values={50,100,200,300,400},
  isobar=true,
  isobar values={0.1,1,10,100,250},
  isobar temperature min=10,
  isobar temperature max=500,
  labels=true,
  axis options={title={Water enthalpy--entropy diagram}}
]
\end{document}

.