Regarding the selection of 8-character blind plates
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Question: The flange standard for the pipeline is HG/T 20615 Class600 WN/RF. After checking standard HG/T 21547, the 8-character blind plates are available only in PN10.0MPa rating. Which pressure rating should be chosen for the 8-character blind plate? Additionally, HG/T 21547 specifies that the nominal pressure should be ≤4.2 MPa; then how should an 8-character blind plate be selected for pipelines with a working pressure of 4.4 MPa?
This post was last edited by COLORZERO on 2018-8-14 11:08. HG/T 21547-2016 is available for download here: https://bbs.hcbbs.com/thread-1855570-1-1.html
Thank you very much; I checked the old standard earlier
Friend, may I ask you something? The diameter of the flange bolt holes for Class600 DN80 is 22, but why is the diameter of the hook on the flat 8-shaped blind plate BLF-FF Class600 DN80 18? Won’t a M20 bolt not be able to pass through?
I took a quick look and found that the dimensions of G don’t match those of the flange bolt holes. Could anyone explain this?
The last edit to this post was made by wanlirn on 2019-12-23 at 09:40. We all use a single piece of material; holes are drilled based on the diameter of the circle centered around the bolt holes and the straight length of those holes
The maximum pipe diameter specified in this standard is DN600; so which standard should be used for diameters larger than 600?