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For flanging, use hexagon head screws according to DIN 933 with plain washers.
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The companion flanges must have an even bearing surface; seals are inadmissible.
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Do not use too long screws, because they would push the rubber doughnut off the steel
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flange.
Observe the recommended screw lengths (see table 1 , calculation including plain
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washers).
Table 1 Screws for flanges PN 6 and PN 10
1 Screws DIN 933, 2 Threads, 3 Screw length L in mm for non-rotatable flange ac-
cording to DIN 2632 or 2566, 4 Screw length L1 in mm for rotatable flange according to
DIN 2673, 5 Thickness of plain washer according to DIN 125
For screw torques, see table 2 .
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1 Nominal width, 2 Torque.
Pull the screws tight crosswise and evenly at the flange.
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Retighten the screws after initial start-up.
During electric-welding work on the pipeline near rubber-metal pipe connectors,
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bypass them with grounding litz wire. Always protect the rubber-metal pipe connectors
from welding spatters and thermal strain when welding.
If possible, install the rubber-metal pipe connectors so that visual checks can be
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carried out regularly to make sure they are intact.
Cover the rubber-metal pipe connectors to protect them from damages of any kind.
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Do not coat the rubber-metal pipe connectors with paint, and do not apply insulation.
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B
Flange Recommendations
Weld-on flange according to DIN 2631 (PN 6)/2632 (PN 10)
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Rotatable flange with welding neck according to DIN 2673 (PN 10)
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Screwed flange according to DIN 2566 (PN 10)
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Illus. 1 L = screw length for non-rotatable flange DIN 2631, DIN 2632, or DIN 2566
L
= screw length for rotatable flange according to DIN 2673
1
C
Fixed Points
The fixed points and guides of the pipelines must be sufficiently dimensioned to bear
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the pipeline forces. The operator is responsible for making sure the work is carried out
according to good professional practice.
The pipe connectors may not be exposed to any tensile force whatsoever.
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Make sure the fixed points are made according to good professional practice; floating
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pipe suspensions, for example, are not fixed points because the rubber-flange connec-
tion may be torn apart and destroyed in an instable pipe system.
Examples for the arrangement of rubber-metal pipe connectors in illus. 1 , examples for
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fixed points in illus. 2 + 3
Illus. 2 Welded fixed point for double pipe arrangement
Illus. 3 Fixed point arrangement, welded with vertical pipe bend = 90°
Only fasten the fixed points of the pipeline after the rubber-metal pipe connector has
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been installed (after pulling the flange screws tight).
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