Dynasonics MFX Series Insertion MagProbe Flow Meter - Manual (Page 29)

Rev. 01/11 -2.4- MFX
These instructions call for the use of a drilling machine designed for
drilling holes in pipes that are under pressure (for example, Muller
Co., Decatur, Illinois manufactures products for this purpose).
Procedures are as follows:
1. Verify that the line pressure within the pipe is within the rated
limits of the pressure drilling machine, welded coupling or pipe
saddle, valve and MagProbe to be used.
2. Grind off paint or other coatings from the pipe in the area where
the DMP MagProbe Assembly is to be installed. Recommended
minimum straight pipe lengths for best accuracy are 10
diameters upstream and 5 downstream. See Table 2.1.
3. Tack weld a 1-½" NPT female weld-coupling to the pipe or
install a pipe saddle according to the suppliers instructions. The
coupling or saddle must be aligned perpendicular to the
pipe axis and square to its plane.
4. Complete welding. A watertight, 0.25" minimum weld bead is
recommended.
5. Install the close nipple into the weld coupling. Use appropriate
pipe sealants.
6. Install the isolating ball valve on the close nipple. Verify that the
valve is in fully open position.
7. Install drill bit and adapter into the pressure drilling machine.
Then attach the machine to the isolation valve.
8. Drill through the pipe wall in accordance with the instructions
supplied with the drilling machine.
9. Withdraw the drill bit through the isolating valve. Close the valve
and remove the drilling machine. Check for leakage at valve and
connections.
Step C -
Component
Assembly
PART 2 - MAGPROBE INSTALLATION