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Table 17 Pneumatics Double Acting Standard Flow
Air Supply
Dry, oil-free, 5 micron filtered, filtered and regulated air and sweet natural gas (see ISA S7.3)
Action
Output 1 increases with increasing
Output 2 decreases with increasing
Supply Pressure for
Double Acting
25 - 150 psi max. (1.73 to 10.3 bar)
Do not exceed actuator rating.
Air Delivery for
Double Acting
7.2 scf/min (204 L/min) at 30 psi (2.1 bar) supply
12.8 scf/min (362 L/min) at 60 psi (4.2 bar) supply
18.3 scf/min (518 L/min) at 90 psi (6.3 bar) supply
23.8 scf/min (674 L/min) at 120 psi (8.4 bar) supply
Air Consumption for
Double Acting
0.42 scf/min (12 L/min) at 30 psi (2.1 bar) supply
0.57 scf/min (16 L/min) at 60 psi (4.2 bar) supply
0.85 scf/min (24 L/min) at 90 psi (6.3 bar) supply
1.06 scf/min (30 L/min) at 120 psi (8.4 bar) supply
Air Supply Failure
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 pres-
sure. Always set control set point to 0%, and put the process control system in manual, for
smooth recovery from air supply failure.
Loss of Input Signal
Output 1 drops to low pressure.
Output 2 rises to supply pressure.
Table 18 FOUNDATION Fieldbus Block Times
Analog Output (AO)
12 ms
Arithmetic (AR)
20 ms
(2) Enhanced Process Control (PID)
12 ms
Input Selector (SEL)
15 ms
(2) Discrete Output (DO)
12 ms
Multiple Analog Input (AI)
15 ms
Output Splitter (OS)
20 ms
Control Selector (CS)
20 ms
(3) Analog Input (AI)
12 ms
(2) Discrete Input (DI)
12 ms
Summary of Contents for Baker Hughes Masoneilan SVI FF
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