Emerson Rosemount 3051 Reference Manual page 43

Reference Manual
00809-0100-4001, Rev JA
4.
Five-valve Natural Gas configurations shown:
In normal operation, the two block
valves between the process and
instrument ports will be open, and the
equalizing valves will be closed.
1.
Note
Do not open the low side equalize valve before the high side equalize valve. Doing so will
overpressure the transmitter.
Installation
Open the block valve on the
low pressure side of the
transmitter to return the
transmitter to service.
To zero the 3051, first close
the block valve on the low
pressure (downstream) side
of the transmitter.
H
Drain/
Vent Valve
Equalize
(closed)
Isolate
(open)
Process
H
Test
(Plugged)
Equalize
(closed)
Isolate
(open)
Process
Drain
Vent
(closed)
H
Test
(Plugged)
Equalize
(closed)
Isolate
(open)
Drain Vent
Process
(closed)
Section 2: Installation
November 2012
L
Drain/
Vent
Valve
Isolate
(open)
L
Test
(Plugged)
Equalize
(closed)
Isolate
(open)
Process
L
Test (Plugged)
Equalize
(closed)
Isolate
(closed)
Process
33