Badger Meter Europa GmbH
Nürtinger Str. 76
72639 Neuffen (Germany)
Tel. +49-7025-9208-0
Fax +49-7025-9208-15
www.badgermeter.de
badger@badgermeter.de
Venturi-tube Lo-Loss
Installation
Pressure connections ¼“ NPT.
Flange bolt holes must straddle horizontal and vertical
centerlines.
Badger venturi flow tubes of the insert type must be
handled on the outside surface only. If a sling is required,
use hemp rope. Bevore installing the primary element,
make certain the arrow on the tube is pointed in the
direction of flow. Then center the tube into the flow line
and clamp between flanges. Suitable gaskets must be
installed so they do not protrude inside the pipeline. A
straight length of pipe, equivalent to at least eight pipe
diameters, should be provided immediately upstream from
the tube. Adverse flow conditions will require a greater
length of straight piping. Pressure taps on insert tubes are
stamped „H“ for high pressure and „L“ for low pressure.
These taps are located on opposite sides of the tube and
should be placed on the horizontal axis. For liquids, the
small bypass hole should be located at the top of the pipe.
For stream or gases, the bypass hole should be at the
bottom of the pipe.
The nameplate designating the top of the flow tube is
installed on the mounting flange. A gate valve must be
provided near each pressure connection, and all pressure
piping should be installed with a minimum one way slope
of ¼“ per foot to remote instruments. Wherever possible,
avoid sudden changes in pipe direction. If abrupt changes
are necessary, use plugged crosses so the pipe can be
easily flushed or rodded. Be sure all joints are pressure
tight. When making installations of this type, you should
carefully observe the grade requirements of horizontal
piping, as well as the valve and fitting requirements of the
piping layout. Strap the two runs of pressure piping
together throughout as much of the run as possible. Ream
the ends of the pipe to eliminate inward flares. Do not
make connections to any remote instrument until you have
flushed out the pressure piping and carefully read the
instruction manual for the instrument to be used.
VT_BTV_IA_02_0901.doc
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