Example
: The sensor is installed in an 8 inch schedule 80 pipe, with a pipe wall thickness of 1/2 inch . If the overall sensor
length is 16-3/8 inches and the H dimension is 10 inches, the D value is calculated as follows:
D = Overall length − (H + pipe wall thickness + Insertion Depth)
D = 16-3/8 in. − (10 in. + 1/2 in. + 1-1/2 in.)
D = 16-3/8 in. − 12 in.
D = 4-3/8 in.
BLEED PETCOCK
HEX NUT
JAM NUT
Figure 4: Sensor parts
1 . Set one set of the hex/jam nuts so that the distance between the top surface of the hex nut and the top surface of the hex
mounting adaptor is equal to the D dimension calculated above .
2 . Then adjust the other two sets of hex/jam nuts 1-1/2 inches (38 mm) below the first jam nut to allow clearance for the
Model HTT (Hot Tap Tool) top yoke .
3 . Fully extend the HTT by turning the drive nut counterclockwise with a 15/16 inch socket or box wrench (customer
supplied) until the drive nut contacts the tool . Slide the positioning collar into the tool top yoke .
4 . Remove the HTT split ring and clevis pin and slide the tool bottom yoke into the groove on the sensor hex mounting
adaptor . Secure by replacing the clevis pin and split ring .
5 . Mark the sleeve 2-3/4 inches (51 mm) from the impeller end of the metal sleeve . This mark is a stopping point to prevent
the impeller/bearing from being damaged .
6 . Open the bleed petcock valve on the hex mounting adapter to relieve the pressure resulting from the flow sensor
sleeve insertion .
7 . Carefully hand insert the hot tap flow sensor sleeve assembly into the hex mounting adapter until the mark lines up with
the top of the hex mounting adapter . At this point, the sleeve will have been inserted past the top two O-rings in the
adapter, approximately 1…1-1/4 inches (25…32 mm) . Take care not to push the sensor past the mark on the sleeve as the
impeller could be damaged if it strikes the closed valve .
8 . Rotate the HTT so the threaded rod with the adjusted hex/jam nuts is centered in the top yoke of the hot tap tool .
9 . Rotate the sensor sleeve so the positioning collar holes align with the threaded rods and flow direction label is in general
direction making sure the positioning collar is located in the recessed area of the top yoke .
10 . Slide the top yoke of the HTT over the positioning collar and secure by tightening the two thumbscrews on top of
the yoke .
11 . Close the bleed petcock and slowly open the isolation valve .
12 . Slowly turn the 15/16 inch drive nut clockwise to insert the sensor sleeve assembly through the valve and into
the pipeline .
13 . Carefully guide the three threaded studs of the hex mounting adapter through the holes of the sensor positioning collar .
14 . Carefully lower the sensor until the positioning collar contacts the hex nut preset for the correct depth adjustment .
Hot Tap Installation for 225BR, 226BR, and 226SS
Page 8
February 2018
SEN-UM-01635-EN-11