Dynasonics 701_771C Series Insertion Ultrasonic Flow Meter - Manual (Page 15)

Rev. 12/97 -14- D77X
Procedures are as follows:
1.Verify that the pipe’s line pressure is
rated limits of the pressure drilling machine to be used.
2. Grind off paint or other coatings from the pipe in the
area where the DT7 Probe Assembly is to be
installed. Recommended minimum straight pipe
lengths for best accuracy are 10 diameters upstream
and 5 downstream.
3. Tack weld a 1 ½"NPT weld coupling to the pipe or
install service 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 water tight, 0.25"
weld bead is recommended.
5.Install the close nipple (supplied with
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.
10. Place pipe sealant on the 1-½” NPT threads of the
Insertion Fitting assembly. Screw the assembly into
the isolation valve and tighten with a 2-½” Pump
wrench.
PART 2 - TRANSDUCER INSTALLATION
Step C - Component
Assembly