gas blanketing pilot operated regulator
gas blanketing pilot operated regulator
(OP)
hi everybody
i am in doubt about action of low pressure gas blanketing pilot operated regulator (Fisher Type 1190)
this PCV is on service for N2 blanketing for AST( Heavy end Hydrocarbon-S.G=0.8), Set point of this PCV is .008 Barg
but in operation, this pressure not acheived, and the tank pressure decrease until to .004 barg
i want to know why this problem happend, and how we can improve the function of PCV
for more information, below datas are in PCV Data sheet
size and type : 4 inch 1190
allowed Max Diff. Press. : 8.6 bar
pilot type : Y191
N2 inlet pressure : 7.o barg
N2 outlet pressure : .008 barg
N2 flow rat (Max/normal) : 7171/3094 Nm3/hr
Sizing Coefficient Cv (Max/Normal) : 77.182/33.124
i am in doubt about action of low pressure gas blanketing pilot operated regulator (Fisher Type 1190)
this PCV is on service for N2 blanketing for AST( Heavy end Hydrocarbon-S.G=0.8), Set point of this PCV is .008 Barg
but in operation, this pressure not acheived, and the tank pressure decrease until to .004 barg
i want to know why this problem happend, and how we can improve the function of PCV
for more information, below datas are in PCV Data sheet
size and type : 4 inch 1190
allowed Max Diff. Press. : 8.6 bar
pilot type : Y191
N2 inlet pressure : 7.o barg
N2 outlet pressure : .008 barg
N2 flow rat (Max/normal) : 7171/3094 Nm3/hr
Sizing Coefficient Cv (Max/Normal) : 77.182/33.124





RE: gas blanketing pilot operated regulator
RE: gas blanketing pilot operated regulator
I did a quick calculation with our program and came to a 1" valve with a CV of 15. I think the valve is operating simply out of operability.
Hope this helps
RE: gas blanketing pilot operated regulator
RE: gas blanketing pilot operated regulator
the valve cannot keep up pumpout i.e. hold setpoint with proportional only