Does the pressure vessel need to be reinforced after the reinforcement
The pressure vessel needs to be filled up to meet the reinforcement. The reinforcement of the reinforcing ring is the welding of a ring of steel plate around the open hole of the shell, which is the reinforcing ring. Reinforcing ring lap structure is used in general and to the wall materials and the wall is the same, the reinforcing ring size can be calculated on the basis of the standard reference can also be calculated based on the principles of equal area reinforcement. When the thickness of the reinforcing ring is more than 8mm, the all-welded transparent structure is generally used to make it bear the force of the wall at the same time. Convenience for welding, reinforcing ring can be on the wall outside surface or the inner surface, or symmetrical placed inside and outside the surface, but for the sake of convenient welding, is generally put the reinforcing ring out single reinforcement. In order to check the tight seam, there is an M10 small screw hole in the reinforcing ring. The weld air is tested by the compression air. The reinforcing circle is now standardized.
The reinforcing ring is the most widely used structure, with simple structure, easy manufacturing and easy material The advantages of solving (general taking and being made with reinforced shell and material, the thickness), safe and reliable etc. But there are also questions Topic: 1. The strengthening area is too fragmented, and the reinforcement efficiency is not high. There is a static air gap between the reinforcing ring and the shell, and the heat transfer effect is poor. The stiffness in this area is enlarged by the welding of the casing, and the cooling of the fillet weld is larger It is easy to crack at the seams; After using the reinforcement loop, although the peak stress at the corner is reduced, due to the variation in the shape size, On the periphery of the reinforcing loop causes discontinuous stress, which causes the new stress concentration, which makes it easy to open on the toes Crack; The structure of this structure, due to its failure to form a whole with the shell or the receiver, is of poor fatigue performance and fatigue life Life was reduced by about 30% when the hole was opened, and the overall reinforcement structure decreased (10 ~ 15%). For these reasons, the limits of the use of the reinforcing circle should be restricted.
Pressure vessel only in certain circumstances can use reinforcing ring reinforcing: 1) the cylinder body wall thickness less than or equal to 38 mm, 2) the thickness of reinforcing ring is less than 1.5 the delta) standard tensile strength of steel and the lower limit is less than 540 MPa Cr - Mo steel container 4) 5) design pressure is less than 4.0 MPa pressure vessel container when the medium is not extreme, highly toxic hazard 6) 7) fatigue pressure vessel design temperature below 350 ° C is more than 20 ° C, a total of the seven kinds of cases you can use the reinforcing ring, if all comply with the seven kinds of conditions and the calculation, without reinforcing ring satisfy strength requirement, the designer has a lot to autonomy, can add don't add
