What issues should be noted when installing metal flexible connections?

What issues should be noted when installing metal flexible connections?
As can be seen from the working conditions and structural features, the primary failure damage stress of metal flexible connections from the pressure of gas ammonia and because of the fixed temperature difference between the two ends of the metal flexible connection caused by thermal expansion of the metal flexible connection and converted into axial compressive stress. Therefore, the lateral and axial direction of the metal soft connection is subject to the role of uniform external pressure. Axial external pressure has little effect on the instability of the flexible metal connection. It is possible to directly comment and plan for the instability of the cylinder of the flexible metal connection subjected to lateral external pressure only as the primary failure problem. The failure of the metal soft connection may be when the external pressure reaches a certain value, the radial deflection of the tube wall increases sharply with the tightening stress until the metal soft connection is deflated. Metal flexible joints are machined from light pipe billets.
Because of the presence of corrugated joints, the heat transfer area is better because the wall thickness is only 018 mm. The important thing is that because of the presence of corrugated joints, the liquid flows through the tube with constant turbulence, and the heat transfer is very good. On the other hand, because of the turbulent flow of liquid, constantly scouring the inner wall, so that it is difficult to constitute the dust and scale, metal soft connections simply do not present the phenomenon of pipe plugging. When using metal flexible connections, we must pay attention to the following points.
1 . Selected for the specific situation. Metal flexible connections to the working conditions are more stringent requirements, the pressure of the refrigerant medium can not be too high.
2 . Metal soft connection control of the poor seismic resistance, transport and lifting, shall not present excessive bumping.
3 . Metal flexible connections should be parked once in about 10 months of operation, to facilitate the recovery of metal flexible connections shortened. The shortening of the metal flexible connection is also conducive to the removal of dust and dirt.
4 . Each plant refrigerant cleanliness is different, the new metal flexible connection can be installed in the import of a filtering equipment, together with the metal flexible link should be opened regularly to check.