Marking Directly On The Pipe - Siemens SITRANS F US SONOFLO Handbook

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SITRANS F US SONOFLO
Marking directly on the
pipe
3. Construction of the sensor
With pipes larger than DN 1000 marking directly on the pipe is recommended.
Marking directly on the pipe is carried out as follows:
Step 1
The following pipe dimensions must be known before calculating the transducer position and
making the drawing.
1. Circumference (C)
2. Wall thickness (t)
The circumference is determined using the measuring tape. Make sure that the pipe's surface is
plane and free of dirt etc. The measuring tape must fit snugly around the pipe. Read the
circumference (C). Repeat the measurement several times to avoid inaccuracies.
The wall thickness is obtained by measuring a similar pipe whose wall thickness is accessible, or
by consulting the relevant standard.
Step 2
Remove any rust or dirt from the surface of the pipe.
Find the top line X - X using a spirit level. Place the spirit level on top of the pipe. When it is perfectly
balanced in horizontal position, it intersects the top line.
Mark 4 -5 points on the pipe's top line using the above method.
Draw a line X - X through the marked top points using a length of angle iron.
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