Discussion on the Use of Reinforcement Rings at the Nozzles of Equipment in Low-Temperature and Low-Pressure Environments
Thread Content
The design temperature ranges from -18 to 180°C, with a design pressure of 2.5 MPa. The medium inside the vessel is ammonia (possibly liquid ammonia), and the material used for the vessel shell is 16MnDR. Currently, a shell thickness of 14 mm is sufficient, and the reinforcement through openings is also acceptable; however, the calculations for local stresses show that the shell is too weak – a thickness of at least 18 mm is required. Simply thickening the connections is no longer effective, as the locations where these connections are made are too close to the tube sheet. Increasing the shell thickness would inevitably result in a very thick tube sheet. Please discuss whether reinforcement rings can be used to strengthen the openings in the heat exchanger under these conditions Note: If only the reinforcement for the openings is considered, it meets the requirements; however, the calculation of local stress does not meet the standards.
Thicker reinforcement plates? It’s not necessary; let’s do the calculations first
After using the reinforcement rings, the calculations came out satisfactory. However, many people say that this is a low-temperature vessel made of 16MnDR material, and such vessels are not allowed to have reinforcement rings installed.
Check the specifications to see what it says there, and also consult the petrochemical equipment design manuals to find out what recommendations and requirements industry experts with extensive experience offer
The wall thickness of the take over can be controlled to be within 2 times the thickness of the cylinder