Owner’s Manual for ONICON Insertion Turbine Flow Meters • September 27, 2001
10
3.2 MECHANICAL INSTALLATION
Turbine meters may require periodic maintenance and you should be able to remove the
meter when necessary without shutting down your system. To take advantage of the ONICON
Flow Meter’s built-in Hot Tap feature, it must be installed through an isolation valve. The
location must allow sufficient overhead clearance for meter removal (for cleaning and
preventative maintenance). A full 1” opening is required to clear the turbine assembly. Make
sure that your valves and fittings are full port and at least 1” in actual internal diameter. Also,
note that an oversized access hole can cause undesirable turbulence.
Try to limit the overall height from the pipe’s outside diameter to the top of the valve to 5½ -
6”. ONICON calculates the stem length of the flow meter based on pipe size and this nominal
height. If your installation requires a taller fitting assembly and the dimension was not
specified on the order form, please contact the factory before installation. This way ONICON
can offer you credit for your meter if you decide to exchange it for one with a longer stem.
Returns may be subject to a restocking fee.
ONICON’s Standard Installation Hardware
kit is for use in a drained, non-pressurized
system. The access hole is drilled (1”
minimum) prior to installation of the 1”
NPT branch outlet, close nipple and full
port ball valve. Once the isolation valve is
installed, the piping system can be flushed
and pressurized. The flow meter may now
be inserted or removed by hand without
having to drain the system. Please read all
instructions before proceeding with meter
insertion.
ONICON’s Hot Tap Installation Hardware
kit offers an alternative installation when it
is not practical to drain or relieve the
pressure in the system. In this case, a 1¼”
branch outlet, close nipple and 1¼” full
port ball valve are installed first. Then, a
hot tap drilling apparatus can be used to
drill a 1” diameter hole through the valve,
without shutting down or draining the pipe.
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