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Idiomas disponibles
Idiomas disponibles
Groove-and-tongue companion flanges are inadmissible.
Sharp-edged pipe ends / companion flanges cut the PTFE sealing surface. Insert an
additional flat seal.
Tighten the flange screws crosswise and evenly. To avoid damaging the bellows with the
tools, hold the screw head tight on the inside with the wrench, and turn the nuts on the
outside. Retighten the screws after initial start-up.
The expansion joint may not be subject to torsional stress (twisting) during installation/
deinstallation and operation.
During electric-welding work on the pipeline near expansion joints, bypass them with
grounding litz wire. Always protect the expansion joints from welding spatters and ther-
mal strain when welding.
If the flow rate is high, possibly leading to resonances or turbulences where the flow
direction is redirected (e. g. behind pipes, valves, T-pieces, pipe bends), a guiding pipe
(LR) must be installed.
During installation, please mind the flow direction (direction of the arrow = flow direc-
tion).
If possible, install the expansion joints so that visual checks can be carried out regularly
to make sure they are intact. In case of visible defects, please contact our Technical
Advisory Service immediately.
Cover the expansion joints to protect them from damages of any kind.
Do not coat the bellows with paint, and do not apply any insulation.
The fixed points and guides of the pipelines must be sufficiently dimensioned to bear
the pipeline forces. The operator is responsible for making sure the work is carried out
according to good professional practice.
Only fasten the fixed points of the pipeline after the expansion joint has been mounted
(after pulling the flange screws tight).
Normally, no pressure-resistance test according to annex 1, section 3.22 of Pressure
Equipment Directive 97/23/EU is carried out by the manufacturer. Such a test must be
carried out by the operator after the pipeline system has been installed (PT = 1.43 x PS).
The operator must provide for the necessary safety and monitoring devices in the pipe-
line system (e. g. installation of temperature probes, pressure-limiting valves, measures
to prevent pressure surges and water impact).
Screw torques for STENFLEX
The torques listed overleaf refer to unused new expansion joints. If required, the values
may be exceeded by 50 %. Tighten the screws crosswise several times to achieve an even
sealing compression. Retighten the screws after approx. 24 operating hours to compensate
the settlement.
®
PTFE expansion joints.
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