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Turbine Flow Meter Manual 05/13 - 0721-1 / 13518 Page 13
3.3.2 Onicon Standard Installation Hardware Kits
Standard installation hardware kits are designed to be installed on piping systems that
are drained and at atmospheric pressure. The access hole is drilled (1” minimum) prior
to installation of the branch outlet with 1” NPT threads, the close nipple and full port ball
valve. Once the isolation valve is installed, the piping system can be ushed, lled and
pressurized. The ow meter may now be inserted or removed by hand without having to
stop ow or drain the system. Please read all instructions before proceeding with meter
insertion.
3.3.3 Onicon Hot Tap Installation Hardware Kits
ONICON offers an alternative installation hardware kit when it is not practical to relieve
pressure and drain the system. In this case, a 1¼” branch outlet, a close nipple and a 1¼”
full port ball valve are installed rst. Then, a hot tap drilling apparatus is used to drill a 1”
diameter hole through the valve. This eliminates the need to stop ow and drain the
pipe. Please read all instructions before proceeding with meter insertion.
3.3.1 Insertion Meter Installation Kits
ONICON offers a wide range of installation hardware kits for commonly used pipe
materials. The kits are specically designed for ONICON insertion ow meters, and their
use is recommended. Refer to Appendix B of detailed infromation regarding ONICON
installation hardware kits.
The use of ONICON installation hardware kits accomplishes two important objectives.
First, it ensures that the proper hardware is used. Second, it simplies order processing
by standardizing the dimensions of the installation hardware. ONICON must have an
accurate measurement of the overall height of the installation hardware as measured from
the outside wall of the pipe to the top of the valve in order to determine the correct stem
length when assembling insertion meters in our factory. ONICON documents refer to this
dimension as the stack height.
ONICON installation hardware kits consist of three separate component parts:
Different pipe materials require different branch outlets and may include additional
bushings to properly size the opening.
Some type of
threaded branch
outlet,
An
interconnecting
close nipple,
And a full port
isolation valve.
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