Natural gas $(100\%$ methane$)$ saturated with steam, transferred with natural gas pipeline, P$=60$ bar, T$=15$oC$.$ We want to reduce pressure $($with a pressure reducer$)$ but not to cause icing problems. Which is the min pressure we can reach $($without icing problems$)$

JT$=0,55$ K$/$bar$,$ z$=0,90$ MW$=16,4$