Seitenzahl 4
11/2019 ● O nly one compensator is fitted between two anchors. ● T ie rods on lateral compensators are correctly fitted and are secure. Anchors/guides Anchors and guides on the pipeline must be placed as per the guidelines in EJMA so that: ● T he compensator is not subjected to dead-weight loads from the pipeline. ● T he expansion joint must be installed so that no forces and moments are transferred from the pipe system. ● T he pipeline does not sag, “hog” or “snake” between anchors or guides. ● D rop rods or hanger rods should be avoided, guides should be slide or roller type. ● W hen using compensators the distance must not exceed 4 x the nominal diameter of the pipeline. ● T he distance between the first and the second guide must not exceed 14 x the nominal diameter of the pipeline. ● T he distance between the remaining guides must not exceed 21 x the nominal diameter of the pipeline. This distance must be reduced if this is necessary in order to stabilize the pipeline. During installation ● W hen welding or grinding near the compensa- tor it should be protected against weld spatter and debris, we recommend use of a chloride- free welding blanket. ● C are must be taken to avoid accidental arcing on the thin-walled bellows in the compensator. ● T he compensator should be protected from damage caused by adjacent construc- tion work, splashes from mortar or plaster can damage the compensator and must be avoided. ● If the compensator is equipped with an inner sleeve, make sure the flow arrow on the com- pensator points in the direction of the system flow. ● W hen fitting angular compensators it is impor- tant that the hinge pins are in the correct orientation. 5 ● D o not apply torsion to the compensator to align the bolts on flanged units. ● C omponents such as tie rods, hinge links and gimbals must not be removed. They form part of the integrity and functionality of the compensator. ● C are should be taken with fitting tools, take care not to damage the bellows with spanners or wrenches when tightening bolts. ● O n flanged units ensure that over-long studs or bolts do not contact and damage the bellows. ● W hen compensators are supplied without external covers and insulation is to be added a lagging cover should be fitted to prevent insula- tion material becoming trapped between the bellows convolutions where it can prevent the bellows from functioning correctly. On completion of installation Before the completed system is tested and commissioned it should be subjected to a visual inspection. Many years experience has shown that careful checking of the installation before pressure testing and final commissioning will help to ensure successful installation and performance. Before pressure testing and as part of the inspection regime ensure that all temporary shipping and pre- tensioning devices (marked by yellow and black striped tape) are removed from the compensator. PRESSURE TEST Pressure test must be carried out according to the stated test specifications on the drawing and/or the tag plates on the compensator. Prior to pressure testing CHECK THE FOLLOWING ● H as the compensator been damaged during installation? ● Is the entire pipe system, especially anchors, guides and compensators, installed as shown in the drawings in the installation instructions? ● Is the compensator correctly fitted into the system and not used to correct fabrication inaccuracies? ● I s the flow direction of the compensator cor- rect?
Seitenzahl 5
6 11/2019 ● A re the bellows and other moving parts on the compensator free from foreign objects such as insulating material? ● H ave all shipping bars, pre-tensioning devices, protective parts and packaging materials been removed? ● H ave all guides, supports and compensators been released to allow the expected move- ments in the pipe system? ● I f the system is designed for a light flow me- dium such as air or gas and is to be tested with a heavier medium such as water have the necessary steps been taken to ensure that the extra dead-weight loads to the compensator and pipe system can be safely accommodated? During pressure testing CHECK THE FOLLOWING ● T he pressure should be increased gradually until the specified test pressure is reached. ● C heck the compensator for any sign of leakage at the connections and check the gauges for pressure drops. ● E xamine the compensator for any signs of twisting, instability, squirming at the bellows or unexpected movement of any of its components. ● A ny unexpected movement of the pipe system which could be pressure-related should be investigated and addressed. After pressure testing CHECK THE FOLLOWING The compensator and pipe system should remain as designed, in particular check that the anchors and their attachments to civil works or structure do not display any signs of distress. It should be noted that after testing some residual testing fluid may remain in the bellows, if this is likely to affect the functioning of the system arran- gements to remove the fluid may be necessary. AVOID ● D ropping or knocking the bellows. ● U sing cleaning agents containing chlorides. ● U se of stickers, containing chlorides, on the expansion joint should be avoided. ● U sing steel wool or steel brushes on the bel- lows. ● In case of any doubt the pressure test should not exceed more than 1½ x the design pressure without previous written confirmation from us. START-UP ● D o not exceed the allowable test pressure. ● When high temperatures are, involved, ap- propriate protection measures are to be made on the customers end in order to avoid personal injury caused by contacts with the hot surfaces. ● I n order to ensure safe and reliable operation, expansion joints should only be used within the allowable pressure, temperature and move- ments limits. USAGE ● B e particularly attentive to durability against flow media and corrosion resistance, before using the expansion joints, observe the dura bility list in case of doubt. ● G uide sleeves must be installed in the expan- sion joints for a flow containing aggressive media and in the event of high flow velocities or turbulent flow. ● F or usage, the operating data as stated in the design drawings and/or on the nameplate shall apply as application limits. MAINTENANCE A correctly dimensioned and correctly installed compensator does not require any special mainte- nance other than the inspection that is carried out for the other parts of the pipe system in which the compensator is installed. Periodic inspection are conducted according to national regulations. We recommend that you carry out ongoing inspec- tion of the pipe system throughout its service life. The aim of these inspections is to check for the presence of rust, whether parts have come loose, etc. The frequency of these inspections is deter-
