Module 2a Axial Exp.Joints BOA AG General - BOA Group

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DN L 1 [mm] L 2 [mm] L 3 [mm]15 30 + 1050 155020 40 + 1200 175025 50 + 1400 200032 64 + 1550 225040 80 + 1750 250050 100 + 1950 280065 130 + 2250 320080 160 + 2500 3550100 200 + 2800 4000125 250 + 3100 4450150 300 + 3450 4900200 400 + 3950 5650250 500 + 4400 6300300 600 + 4850 6900350 700 + 5200 7450400 800 + 5600 8000450 900 + 5900 8450500 1000 + 6250 8900600 1200 + 6850 9800700 1400 + 7450 10600800 1600 + 7900 11300Table 4 (only valid for steel pipelines) Diagram 2Nominal size DNAnchor points Install main anchors at locations where the pipeline changes direction. Limit by anchors each pipe section to be compensated for.- Only one expansion joint is allowed between two anchors.- Main anchors must be installed at locations where the pipeline changes direction. They must take up the pressure thrusts of the expansionjoints as well as the frictional forces of the pipe supports/ guides.- Intermediate anchors must be installed if the movement capacity of one axial expansion joint is not sufficient to compensate for the entireexpansion of a long pipeline. In that case, several axial expansion joints are required.- In vacuum mode, the anchor points must be capable to take up tensile and pressure forces.Anchor pointGuide support<strong>Exp</strong>ansion jointAnchor pointGuide supportFig. 5Intermediate anchor between expansion jointsFig. 612
Vibration compensation The expansion joint should be installed as close as possible to the vibratingunit to make use of its entire absorption capacity. The vibration absorber must be installed as close as possible to the vibrationsource so as to avoid resonance of the other parts. Primarily it must be ensured that the vibration amplitude acts laterally, i.e.perpendicular to the vibration absorber axis. Install an anchor directly behind the expansion joint. Installation is madewithout prerestraint.Anchor pointVibrations in alldirectionsCAUTIONIf unrestrained vibration absorbers are installed, the reaction force must be takeninto account.UnitFig. 7PrerestraintAll common expansion joints must be installed prerestrained by 50% of theirmovement capacity (for heating systems: overall length of expansion joint plus50%, whereas for cooling systems: overall length of expansion joint minus 50% ofthe movement). If an expansion joint is not installed at the lowest operating temperatureof a heating system or at the highest operating temperature of a coolingsystem (e.g. repair of a still-warm pipe), an individual prerestraint mode must bechosen (see diagram 3).Fig. 8Prerestraint diagramTemperature difference in °C betweeninstallation and lowest temperatureThermal expansion of the pipeline at installation temperature in mmLength of pipeline in mTotal anticipated movement of the expansion joint in mmPrerestraint of the expansion joint in mmDiagram 313
Page 1 and 2: Expansion Joints Guide Module 2a- A
Page 3 and 4: BOAExpansion Joints Guide1 Axial Ex
Page 5 and 6: BOAExpansion Joints Guide2 Standard
Page 7 and 8: 2.4 Axial expansion joints with wel
Page 10 and 11: 3.2 Axial expansion joints / Disass
Page 14 and 15: Example for Diagram 3Order is place
Page 16: Subject to changes13-07BOA AGStatio

Module 2a Axial Exp.Joints BOA AG General - BOA Group

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