Application | Flow Switches
Application drawings for Vane Operated Automatic Flow Switch
2 ½ " 1 ½ " FACE OR HEX BUSHING
¾ " NPT
¾ " NPT
ANSI THREADED REDUCING FLANGE ANSI RF WELDING NECK FLANGE
CUT HOLE IN PIPE 27⁄8 " (73.0) DIA. MINIMUM
CUT HOLE IN PIPE 115⁄16 " (49.2) DIA. MINIMUM
1 ½ " 3000 LB. COUPLING
1" (25.4)
2 ½ " Thredolet
1 ½ " THREDOLET
21⁄16 " (52.4) BORE I.D.
"A"
*
FLOW
LINE PIPE SIZE
DIM. "A"
* FLANGE FACE TO PIPE O.D. SPECIFIED BY CUSTOMER NORMALLY SHOULD NOT EXCEED 5" (127).
3" 4"
2½ (63.5) 2 7⁄16 (61.9)
NOT RECOMMENDED, UNLESS COUPLING IS BORED OUT TO 21/16" (52.4) AS SHOWN.
2 1 / 2 " THREDOLET INSTALLATION
FLANGE INSTALLATION
STANDARD INSTALLATION
LOCATION
For proper operation the appropriate sensor must be chosen and installed 1. Choose the flow direction: horizontal or vertical. Flow sensors are not interchangeable.
2. Install the sensor in the pipe without compromising the upstream and downstream pipe runs shown in Table 3. 3. For horizontal flow applications the appropriate device must be installed within 5° of vertical for proper operation. 4. For vertical up flow applications the appropriate device must be installed within 5° of horizontal for proper operation (flow must go up).
The sensor should be installed in the flowing line with as much straight run of pipe upstream as possible. A rule of thumb is to allow 10 - 15 pipe diameters upstream and 5 downstream. The table below lists recommended up and down piping.
TABLE 3
Upstream and Downstream Dimensions in Terms of Internal Diameter of Pipe*
Minimum Diameter of Straight Pipe
Upstream
Downstream
Out of Plane
Upstream condition
In-Plane
One Elbow or Tee Two 90° Bends in Same Plane Two 90° Bends in
7
9
5 5
8
12
18
24
5
Different Plane Reducers or Expanders
8
8
5 5 5
All Valves **
24 10
24
Blower
12
* Values shown are recommedned spacing, in terms of internal diameter for normal industrial metering requirements. For laboratory or high accuracy work, add 25% to values.
** Includes gate, globe, plug and other throttling valves that are only partially opened. If valve is to be fully open, use values for pipe size change. CONTROL VALVES SHOULD BE LOCATED AFTER THE FLOW SENSOR.
Bulletin 8590 Page 4
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