3.3 INSTALLING THE FLOW METER
Begin by calculating the effort that will be required to hold the meter. Establish adequate footing
for this task, taking extra care when working from a ladder or platform. Use the following
formula:
E=0.2 x P Where: E = effort in pounds
P = system pressure in pounds per square inch
Example: In a 50 PSI system, 10 pounds of force is required to insert the meter into
the pipe.
WARNING
SYSTEM MAY BE UNDER HIGH PRESSURE. When inserting, removing or adjusting the meter
position, be sure to hold the enclosure firmly by hand before SLOWLY loosening the
compression fitting. Failure to do this will allow the pressure to suddenly and rapidly force the
meter from the pipe causing serious injury. The hand effort required to hold the meter will be 0.2
times the pipe pressure.
!
WARNING
Remove all sources of ignition (i.e. open flame, welding equipment, a lit cigarette, etc.) from the
area prior to installing, removing or adjusting the flow meter when working with combustible
gases.
!
3.3.1 Determining the Insertion Depth, Inserting the Meter and Tightening the
Compression Fitting
WARNING
The following instructions assume that the pipe is pressurized. Whenever the ball valve is open;
a firm grip must be maintained on the meter at all times until the insertion depth is set and the
compression fitting is properly tightened.
!
WARNING
Do not attempt to insert the meter into a pipe pressurized to greater than 200 PSIG. For pipes
pressurized above 200 PSIG isolate flow and relieve pressure in the pipe before attempting to
install the meter.
!
The insertion depth is based on the inside diameter of the pipe into which the meter is
installed. When the meter is properly installed, the flow sensor is positioned in the center
of the pipe.
For meters installed in pipes with a nominal diameter ≤ 6 inches, the reference point for
the insertion depth measurement is the inside wall of the pipe directly opposite from the
insertion point. For meters installed in pipes with a nominal diameter > 6 inches, a depth
gage is provided. See Appendix A-2 for instructions on the use of the insertion depth gage.
| sales@mvandc.com | Phone: 877.566.3837 | Fax: 925.407.2903
