Eight-character blind plates, single blind plates, and partition rings
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“No special specifications are given for the selection of eight-sided blind plates, single blind plates, and spacer rings; eight-sided blind plates are used for nominal sizes DN≤300, while single blind plates and spacer rings are used for DN≥350. ” There is a material specification from a certain design institute; is this specification reasonable?
Each design institute has its own practices; some use eight-character blind plates, while others classify them based on diameter. I think either option is fine; there are advantages and disadvantages to each approach. Using larger-diameter blind plates results in greater weight and more space consumption, while single blind plates along with spacers make lifting easier and save installation space. The downside is that it’s difficult to tell whether something is a blind plate or a gasket when they are positioned between pipes, and the other components need to be stored somewhere else; they have to be searched for again when replacement is needed, which increases the workload associated with management.
Take a look at the standards for blind flanges, such as ASME B16.48. The weights are similar, so they can be placed together; if the weight becomes too great, it will be split into two halves.
You’re wrong; there are relevant standard specifications for this. HG21547 provides details on it – for DN200 and below, 8-character blind flanges are used, while for sizes larger than DN200, plug flanges and gaskets are used; the gaskets are of the open type and the plug flanges are blind flanges.
The standards HG21547, SH/T3425, and ASME B163.48 do not specify the size boundaries for wedge-shaped blind plates, blind plates, or gasket rings. All of this is determined by the designer or the owner themselves.
I had no prior knowledge in this area; I often heard terms like \"blind plate\" but didn’t know what they meant. Today I finally learned about it
I’ve always wanted to learn about this area, but I’ve never used it in practice.
Actually, the regulations set by the design institute can also be changed, depending on the convenience of on-site installation and management.
I called this washer a separator ring; it confused me for ages – I couldn’t figure out what a separator ring actually was. It was only after looking up information that I found out
8-character blind flanges make it easier to determine whether a pipe is open or closed; however, those with larger diameters are somewhat cumbersome to use