diff --git a/src/Backends/Helmholtz/FlashRoutines.cpp b/src/Backends/Helmholtz/FlashRoutines.cpp
index d0379057..4235dd23 100644
--- a/src/Backends/Helmholtz/FlashRoutines.cpp
+++ b/src/Backends/Helmholtz/FlashRoutines.cpp
@@ -1163,7 +1163,12 @@ void FlashRoutines::HSU_P_flash(HelmholtzEOSMixtureBackend &HEOS, parameters oth
                 case iphase_gas:
                 {
                     Tmax = 1.5*HEOS.Tmax();
-                    if (saturation_called){ Tmin = HEOS.SatV->T();}else{Tmin = HEOS._TVanc.pt();}
+                    if (HEOS._p < HEOS.p_triple()){
+                        Tmin = std::max(HEOS.Tmin(), HEOS.Ttriple());
+                    }
+                    else{
+                        if (saturation_called){ Tmin = HEOS.SatV->T();}else{Tmin = HEOS._TVanc.pt();}
+                    }
                     break;
                 }
                 case iphase_liquid:
diff --git a/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
index 617f33a6..41b131ca 100644
--- a/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
+++ b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
@@ -1356,7 +1356,17 @@ void HelmholtzEOSMixtureBackend::p_phase_determination_pure_or_pseudopure(int ot
     }
     else if (_p < components[0].EOS().ptriple*0.9999)
     {
-        throw NotImplementedError(format("for now, we don't support p [%g Pa] below ptriple [%g Pa]",_p, components[0].EOS().ptriple));
+        if (other == iT){
+            if (_T > std::max(Tmin(), Ttriple())){
+                _phase = iphase_gas;
+            }
+            else{
+                 throw NotImplementedError(format("For now, we don't support p [%g Pa] below ptriple [%g Pa] when T [%g] is less than Tmin [%g]",_p, components[0].EOS().ptriple, _T, std::max(Tmin(), Ttriple())) );
+            }
+        }
+        else{
+            _phase = iphase_gas;
+        }
     }
     else{
         throw ValueError(format("The pressure [%g Pa] cannot be used in p_phase_determination",_p));