The condition of WD-210 during occur incident:
By pass valve of WPCV-210 was opened and continue feed N1
WBV-2101 bleed about 350 mmH2O (set point= 100 mmH2O)
WBV-2102 was completely installed.
WBV-2101/2102 were connected with N1 for seal the nozzle to prevent polymer.
LG seal by N1 to prevent polymer
PT, PG nozzles and flame arresters were clogged with polymer.
Safety hat released HCN at about 430 mmH2O.