Blind flange reinforcement
Thread Content
If a steel plate is to be used to create a blind flange but its thickness is insufficient, what kind of reinforcement design should be employed?
The details are as follows: we want to use a 75 mm thick A355 JA50 steel plate to manufacture a 36\" 600# blind flange. Since the thickness of this plate is less than what is required, reinforcement is necessary. Please suggest some structures for reinforcing the blind flange. Thank you very much.
I’m sorry to everyone. But I can’t type in Chinese when using the company computer. :handshake
Experts upstairs, I don’t understand it anyway. The simplest approach is to use an electric welder to attach a piece; for a more sophisticated solution, one can use flanges with linings
Thanks, Shao. According to your approach, should we weld a round plate to the original blind flange or weld some ribs to it?
I can understand the meaning of this text, but I’m not clear about the dimensions of the steel plate. Could you please tell me if it’s lengh355 /width75/height50?
I’m sorry for my poor expression. We have 75 mm thick plates; the material of these plates is A355 JA50, with a yield stress of 355 Mpa. We want to use these plates to manufacture a blind flange with a diameter of 36 inches and a pressure rating of 600#. However, according to ASME B16.47, the thickness of standard blind flanges is over 100 mm. So the question is: how can we create a blind flange with a thickness greater than 100 mm using 75 mm thick plates? Thank you.
I see now; I haven’t worked with that type of material before, and the flanges I’ve dealt with are all ANSI Class 6.5, so I was mistaken. I think the manufacturing process for lined flanges will suffice
thank you very much. I will try.
Based on the stress applied, the # type or cross-type reinforcement scheme is selected through calculation to address the issue of insufficient steel plate thickness
Thank you, Sunjx. Could you recommend some materials on the calculation of the ribs for this reinforced blind flange? I don’t know how to calculate the height of the ribs.
------------------------------------------------- It is theoretically feasible, but it is difficult to carry out the calculations. Using SW-6, it is possible to treat the flange blind plate as a flat cover head of a container; however, this flat cover head must be one that has been reinforced. For designing these reinforcement ribs, reference can be made to JB4735, section 8.3 on the design of flat cover ribs. Note that there is also a ring of ribs surrounding these reinforcement ribs. Therefore, I suggest that the person in question purchase thick steel plates and remake the blind plate – forgings can be used for the blind plate to improve its strength
Thanks LS. I’m looking for the JB4735, 8.3.
It is best to use flange covers with sufficient pressure rating, or to manufacture custom flanges based on the required pressure rating
It’s very simple: weld vertical ribs onto the blind plate, and the design can be adjusted according to the pressure level; possible shapes include “10”, “#”, etc
Thank you everyone. Hello guaizilv, I have found JB/T4735 and read clause 8.3, but I don’t know how to calculate the section coefficient for reinforced round plates. Please give me some advice on this. Thank you very much.