KROHNE VFM 3100 EN - Manual (Page 9)

9
Data Label
Certification Label
Measuring
Range Label
Model Code
Serial No.
Productioncode
Maximum Pressure
Style Letter
Temp Limit per
Sensor Option
Complete VFM 3100
Calibration
Factor
Figure 3. VFM 3100 Identification
1.2. Mechanical Installation
There are two mounting arrangements: integral and remote. The
following sections deal with both the integral and remote VFM 3100
arrangements.
1.2.1. Piping Considerations
Effects of Piping on VFM 3100 Performance
The flange size of the adjoining pipe must be the same nominal size
as the VFM 3100. Flanges with a smooth bore, similar to weld neck
flanges, are preferred.
Normal performance data is based on the use of Schedule 40 piping
upstream and downstream of the VFM 3100. If this is not the case,
the actual schedule must be selected from a picklist during configu-
ration and the distance to the disturbance in pipe diameters entered.
This enables the VFM 3100 to automatically compensate for any in-
duced flow effects.
In addition, the bore of the pipe (flange) and VFM 3100 must be
aligned (see "Installation Procedure" on page 12), and the flange
gaskets installed such that they do not protrude into the flow stream.
NOTE: 1. VFM 3100 mounted near pump discharge or suction lines
may be exposed to oscillatory flow that may affect vortex shedding
or product pipe vibration. Also, VFM 3100 mounted near the dis-
charge of a liquid positive displacement pump or near oscillating
control valves may experience severe flow fluctuations that could da-
mage the sensor. To avoid these adverse situations, install the VFM
3100 at least 20 feet or 40 pipe diameters, whichever is larger, from
the disturbance in question.
2. It is good piping practive that the internal surface of the pipe shall
be free from mill scale, pits, holes, reaming scores, rifling, bumps, or
other irregularities for four pipe diameters upstream and two pipe
diameters downstream of the VFM 3100.
Consideration for VFM 3100 Repair
When installing the VFM 3100, consider VFM 3100 repair. The
VFM 3100 should be accessible for servicing. If the flow cannot be
interrupted to replace a sensor, then an isolation manifold should be
mounted on the VFM 3100 before it is installed.
An acceptable and recommended practice is to install bypass
piping so that the entire VFM 3100 may be removed for servicing
(see Figure 4).
Liquid Control Installations
It is recommended for liquid flow that the VFM 3100 be mounted
upstream at least 5 pipe diameters from the control valve and in
vertical installations in the upward flowing leg. This will help to main-
tain a full pipe and ensure that there is sufficient back pressure to
prevent flashing or cavitation.
30 Pipe Diameters
recommended 5 Pipe Diameters
recommended
Shutoff Valves
Figure 4. Typical Piping Configuration