Flexim FLUXUS G801 - Page 32

6 Mounting
6.2 Transducers FLUXUS G801
2020-06-26, UMFLUXUS_G801V1-0EN
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6.2.2.2 Pipe damping mats
Pipe damping mats can be mounted lengthwise or crosswise on the pipe. They are mounted on the entire pipe circumference.
Pipe damping mats can be mounted to reduce the propagation of acoustic noise in the pipe wall if it is not possible to keep
the recommended distances to the reflection points.
If the measured SCNR value is > 40 dB, it is not necessary to mount pipe damping mats.
6.2.2.3 Self-adhesive damping mats
• Select the measuring point according to the recommendations in chapter 3.
• Observe the operating temperature of the damping mats (see technical specification, section "Damping mats").
• Determine the pipe area where the damping mats are to be mounted:
– For outer pipe diameters < 900 mm, see page 34.
– For outer pipe diameters > 900 mm, see page 36.
• Clean the pipe area where the damping mats are to be mounted:
– If present, the paint layer has to be smoothed by grinding. The paint does not need to be removed completely.
– Remove any rust or loose paint.
– Remove any grease or dust. Clean the pipe surface with soap suds.
• Determine the number and size of the damping mats that are to be mounted:
– For outer pipe diameters < 900 mm, see page 34.
– For outer pipe diameters > 900 mm, see page 36.
• Cut the damping mats to size.
• Remove one part of the protective foil.
• Fix the part of the damping mat without protective foil on the pipe (see Fig. 6.6 a).
• Remove the protective foil bit by bit and fix the damping mat to the pipe at the same time.
• Use a roller to fix the damping mat to the pipe.
• Press the roller on the damping mat:
– First, move the roller from the middle to the edges of the damping mat (see 1 in Fig. 6.6 b).
– Then move the roller in the middle of the damping mat along the pipe circumference (see 2 in Fig. 6.6 b).
• Repeat the steps until all damping mats are fixed to the pipe. The damping mats are mounted edge to edge (see Fig. 6.6 c).
Fig. 6.4: Mounted transducer and pipe damping mats in reflection arrangement
1 – pipe damping mats (mounted lengthwise)
2 – reflection point (e.g., flange, weld)
Fig. 6.5: Removal of the protective foil
1 – protective foil
1
1
2
1