6
- When mounting the flowmeter into the horizontal or oblique pipeline,
position the axis of the Electronic Block (BE) in the vertical plane going
through the pipeline axis. Maximum deflection is
± 30 °
- Intensity of external magnetic field (commercial frequency) should not
exceed 400 A/m.
Table 1. Lengths of straight runs for various MFT design versions
Unidirectional flow
Bidirectional flow
upstream MFT
downstream MFT
upstream MFT
downstream MFT
5
DN
3
DN
5
DN
5
DN
3.2.2. Assembly-welded structure made of the supplied fittings of appropriate
size and design must be used to mount flanged or wafer type
flowmeters into the pipeline.
3.2.3. The fitting assembly for the assembly-welded structure includes:
- Flat welded flanges modified (for flanged and wafer type PFC)
- PFC dimension simulator of appropriate size and design
- Gaskets
- Fasteners (for flanged and wafer type PFCs).
The simulator overall mounting dimensions and DN correspond to
the dimensions (with the highest possible tolerances) of the flowmeter
’s
PFC to be mounted with this fitting assembly. The simulator is installed
instead of the flowmeter when performing mounting or welding or
dispatching MFT for regular calibration or repair.
In addition, the set may include straight pipe runs of appropriate
length (DNs equal to DN of the flowmeter) and concentric adaptors to
provide connection from pipeline's greater DN
1
(DN
2
) to DN of the
flowmeter. DN/DN
1
(DN
2
) ratio
– at customer's option.
View of assembly-welded structures for mounting flanged
flowmeters into the pipeline, and reference linear dimensions are given
in Appendices A and B.
Delivery package is agreed with the customer. Design
documentation package for the fittings is available at customer's option.
3.2.4. Components of the assembly-welded structure are welded together and
then welded to the pipeline where the flow meter will be installed in
compliance with local rules and regulations in force. It is important to
provide alignment of the whole unit and flatness/parallel alignment of
the flanges
between which the Flow Sensor is being installed.
3.2.5. The procedure for manufacturing the assembly-welded structure for the
flanged or wafer type flowmeters is as follows:
a) Weld the flanges to the straight pipe runs (pipeline) considering that the
straight pipe run (pipeline) axis should be perpendicular to the flange
plain adjacent to PFC (see Fig.2).
b) If necessary, weld the adaptors to the opposite ends of the runs (see
Fig.3).
