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Proper insertion distance can be determined by selecting a reference point
on the end housing, measuring the distance from that reference point to the
end of the sensor head, and subtracting from that distance the thickness of
the pipe wall and lining PLUS 1/8". The sensor will be inserted correctly
when the measured distance from the reference point on the end housing to
the pipe wall equals the calculated length.
A typical pipe tap assembly will include a valve or corporation stop and
will end in a threaded nipple. The female mounting fitting on the HTI
transducer can be attached directly to that threaded nipple. If the pipe tap
assembly terminates in a female fitting, a threaded nipple of the appropriate
length must be placed between the pipe tap assembly and the female mount-
ing fitting on the HTI transducer. Teflon tape or other sealant must be used
in all threaded connections to ensure watertight operation. All threaded
connections MUST be securely tightened before proceeding with the instal-
lation.
Once the transducer is physically attached to the tapping assembly, the
valve or corporation stop can be opened.
CAUTION. Keep all body parts clear of the HTI transducer when opening
the gate valve. The HTI transducer may move if the setscrews on the
mounting and sealing assembly are not firmly tightened.
After verifying that all joints are watertight, the sensor head can be posi-
tioned in the flow stream as described above. Once the transducer is prop-
erly placed, the setscrews on the mounting and sealing assembly must be
securely tightened to keep the sensor head locked in place.
NOTE. A light coat of silicone grease applied to the stainless steel pipe will
make it easier to position the HTI transducer.
ADFM Technical Manual (January 2000)
ADFM Hot Tap Insertion
page D -3
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