Siemens SITRANS F M MAG 8000 Operating Manual page 8

MAG 8000 & MAG 8000 CT
Cathodic protected piping
Suggestions for direct
burial of remote sensor
Maximum allowable
torques
8
2. Installation
SFIDK.PS.026.D9.02
Special attention for meter installation in
cathodic protected pipeline.
Isolate the meter from the pipeline by mounting
isolation Sleeves and Washers on the flange
bolts and connect a wire between the pipelines,
dimensioned to manage the cathodic current
and environmental influence.
Remote sensor is protected to IP68/NEMA 6P
and can be buried.
The use of pea gravel, at least 300 mm (12
inches) all around the sensor, is recommended.
This provides some drainage and prevents dirt
from solidifying on the sensor.
It also helps locate the sensor should excavation
be necessary. Before covering the pea gravel
with earth, we suggest using electrical cable
identification tape above the gravel.
Remote sensor cable should be run through a
plastic conduit of 50 mm (2 inches) minimum.
Standard bolts must be well lubricated and
tightened evenly around the gasket. Leakage/
damage to the flowmeter or piping may arise if
bolts are overtightened.
Torque calculations
All values are theoretical and are calculated
making the following assumptions:
• All bolts are new and material selection is
according to EN 1515-1 table 2.
• Gasket material not exceeding 75 shore A
durometer is used between the flowmeter
and mating flanges.
• All bolts are galvanized and adequately
lubricated.
• The values are calculated for use with car-
bon steel flanges.
• Flowmeter and mating flanges are correctly
aligned.