Masoneilan SVI II AP Installation and Maintenance ... - GE Energy

GE Oil and Gas
SVI II AP Instruction Manual
Table 25
Pneumatics Double Acting Standard Flow
Air Supply Dry, oil-free, 5 micron filtered air see ISA S7.3
Action
Supply Pressure for
Double Acting
Air Delivery for
Double Acting
Air Consumption for
Double Acting
Air Supply Failure
Loss of Input Signal
Output 1 increases with increasing
Output 2 decreases with increasing
25 - 150 psi max. (1.73 to 10.3 bar)
Do not exceed actuator rating.
7.2 scfm (203 l/m) at 30 psi (2.1 bar) supply
12.8 scfm (362 l/m) at 60 psi (4.2 bar) supply
18.3 scfm (518 l/m) at 90 psi (6.3 bar) supply
23.8 scfm (674 l/m) at 120 psi (8.4 bar) supply
0.4 scfm (11.3 l/m) at 30 psi (2.1 bar) supply
0.85 scfm (22.6 l/m) at 80 psi (5.52 bar) supply
Positioner cannot control the failure position of an actuator without a spring. The actuator
can, under different conditions, fail in place, fail open, or fail close. In cases where the
valve must fail to a required position additional control equipment is required.
Some overshoot can occur when air pressure returns after a period without air supply
pressure. Always set control set point to 0%, and put the process control system in
manual, for smooth recovery from air supply failure.
Output 1 drops to low pressure.
Output 2 rises to supply pressure.
152