Baker Hughes Masoneilan SVIII AP, Installation And Maintenance Manual

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Masoneilan SVI II AP Installation and Maintenance Manual =
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© 2017 Baker Hughes, a GE company, LLC. All rights reserved.
Connecting the Tubing and Air Supply
The last step in hardware installation for the SVI II AP is to connect the air supply to the
positioner. This section describes the process for connecting the tubing and air supply to a
single and double acting positioner.
WARNING
Isolate the valve from the process and disconnect air tubing from
the positioner. Disconnect air fully to avoid injury or process
damage.
1. Install the tubing to the air supply port,

S

(
arrow only for High Flow).
2. For a single acting actuator - pipe the outbound air from the output pressure port (

I
) to
the actuator
(
arrow only for High Flow).
3. For a double acting actuator - pipe output pressure port one (

I
) for one side of the
actuator and output pressure port two (

II
) for the other side of the actuator
(
arrow only for High Flow).
4. Air supply:
Supply pressure for single acting SVI II AP and AP High Flow:
20 -100 psi (1.4 - 6.9 bar) (138 - 690 kPa)
Supply pressure for double acting SVI II AP:
25 - 150 psi (1.73 - 10.3 bar) (172 - 1030 kPa)
Minimum tubing diameter 1 ⁄ 4" (6mm x 4mm)
NOTE
The SVI II AP Digital Valve Positioner is designed to operate with
clean, dry, oil-free, instrument grade air to ANSI-ISA-57.3 1975
(R1981) or ISA-S7.3-1975 (R1981) or with a sweet natural gas
supply (SVI II AP models SVI II AP-2 through SVI II AP-3).
NOTE
For small actuators it may be necessary to use 1/8" tubing for
Autotune to work properly.
Table 7 Air Supply Requirements
Dew Point At least 18° F (-7° C) below minimum anticipated ambient temperature
Particulate Matter Filtered to 5 microns
Oil Content Less than 1 ppm w/w
Contaminants Free of all corrosive contaminants