Installation and Operation Manual
Urano - Pressure Regulating Valve
MI-31
Elaborado
Verificado / Aprovado
CSQ
Data
Revisão
Página
JJ
JJ
JM
05/07/21
05
38 de 74
4.6.5 BACK-UP LINE SETUP (ACTIVE-MONITOR)
When the regulator is installed in a back-up line in a ACTIVE MONITOR configuration, we recommend
that the procedure given in 4.6.4 be repeated, but the active pressure regulator setpoint of the backup
span shall be adjusted for a pressure 15% - 20% lower than the setpoint of the valve in operation.
After doing so, open
SLOW AND GRADUALLY
the outlet shut-off valve so that the downstream
pressure of the back-up stretch regulator equalizes with the pressure already in operation. The back-up
regulator will remain shut.
To make the regulator of the reserve span assume regulation, slowly press the regulation spring of the
active regulating valve in the clockwise direction until the set point of this regulator reaches a value
higher than the set point of the line in operation, thus the reserve regulator will open slowly and assume
the operation.
It is important that the two regulators remain with a set point difference of at least 5% - 10%, so that
there is no set point overlap causing a competition between the two lines, i.e., at one instant one
regulator opens, at another instant the reserve regulator opens, promoting inaccuracy in regulation.
TABLE OF RECOMMENDED SET POINTS
MAIN ACTIVE
REGULATOR
SET POINT
(PS)
BACK-UP
OF ACTIVE
REGULATOR
SET POINT
MONITOR
REGULATOR
SET POINT
PSV
SET POINT
SSV
SET POINT
2.5 - 5.0 bar
PS x 0.9
PS x 1.150
PS x 1.400
PS x 1.500
5.0 - 12.0 bar
PS x 0.95
PS x 1.050
PS x 1.200
PS x 1.300
12.0 - 20.0 bar
PS x 0.95
PS x 1.025
PS x 1.200
PS x 1.300
20.0 - 80.0 bar
PS x 0.97
PS x 1.025
PS x 1.150
PS x 1.250
Note: The values given in this table are recommended as the best practices, but it is not forbidden the
use different set point ranges upon review and approval by GASCAT.
4.6.6 LIST OF RECOMMENDED TOOLS
To carry out commissioning set point adjustments and start-up of the GASCAT’s regulators model
URANO it is required only the use of a 7/8" combination spanner for setting up the pilot’s adjustment
springs.
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