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There is an error in JB/T 4701-2000. The dimension D3 on page 23 should be D2. If the lining ring presses D3, sometimes the relief hole will be drilled outside the lining ring. The equipment flange 92 standard and 82 standard are both D3. I don’t know why. This problem has not been corrected yet. Two minor errors in JB/T4731-2005 Error 1: Figure 7-6 on page P17: b in Figure a) should be the axial width of the support, and the labeling in the figure is incorrect. Mistake 2: Page P40: FEv in equations A.15 and A.16 shall be FE. Among them, E is the subscript, which cannot be displayed here! Errors in JB/T4710-2005 "Steel Tower Vessels" After getting the new standard JB/T4710-2005 "Steel Tower Vessels", I just flipped through it and found the errors in the standard.: Figure 7-8 on page 16, the skirt cylinder is marked δns, the lead-out hole is marked 50+δsi, 150+δsi ； There are many symbols in Tables 3-2 and 3-3 on pages 59 and 60, but these symbols are not marked in Figures 3-1 and 3-2. The only symbol L2 marked in Figure 3-1 does not have this symbol in Table 3-1. I don’t know how the new standard was achieved! There is an error in ④ in JB4732-95 Amendment No. 2. The correct statement should be: 07MnNiCrMoVDR steel plate: The steel number should be changed to 07MnNiMoVDR. In addition, some data in Appendix G of the standard are not suitable. Why hasn’t it been revised this time? What was downloaded from the website of the Compliance Standards Committee is definitely not a typographical error, it is... The reason for changing the material name is that the original name was too long, so a Cr was removed. Regarding the δ when calculating the internal pressure large cone angle shell in HG20583, is it a printing error? When calculating the internal pressure large cone angle shell δ in HG20583 P90, a β needs to be calculated, but there is a δ in the calculation formula. I don’t understand that since the final calculation is to calculate δ, but in the process of calculation, the parameter δ needs to be entered. I don’t understand. I hope an expert can give me some advice. Is it a printing error? The δ in the formula is a printing error, which is δ2. It seems that I haven’t seen the change order! Errors in the regulations. This content is provided by members and is a teacher's notes during the lecture. It is for reference only! If there are any errors, please feel free to comment and correct me! Ronggui, page 10, line 5 from the bottom: The special steel for pressure vessels should be special steel plates for pressure vessels. Page 24, Article 39, Paragraph 1: ~~The design temperature is 20 to 50 degrees above zero. Page 32, Article 65~~~~, and has passed the pressure test and air tightness test and~~~, it should be and has passed the pressure resistance test~~~. The pressure test in paragraph 7 of Article 71 on page 35 should be changed to withstand pressure test. Page 39, 4th line from the bottom: and shall be welded on site at the same time as the product shall be and shall be welded on site at the same time as page 40, line 7: When repairing, it should comply with Article 70 ~: Should be replaced by non-destructive testing of pressure vessel butt joints: Page 53, Article 107~~, obtained in advance * * Inspection agency approval. should be obtained in advance instead * * Supervisory body approval. Page 57, Article 115 ~~~ A pressure vessel design and manufacturing (or assembly and welding) unit with corresponding manufacturing qualifications should be selected. Instead, a pressure vessel design and manufacturing (or assembly and welding) unit with corresponding qualifications should be selected. In the first paragraph of the 10th line from the bottom on page 70, the word "bursting disc device" should be changed to "bursting disc device" and the word "device" should be removed. 12Cr1Mo1 in Table 3 of P9 of the JB4726 standard should be 12Cr2Mo1. I made a simple mistake. In the calculation formula of the rigid ring ear seat, in the strength calculation of the Shg20582 steel chemical container, "S" appears in the formula for calculating the XX inertia axis on page P199. I wonder who can tell me what S refers to? S is δ, which is probably a printing error! By the way, δ in the formula (2-6) in the calculation of large cone angles in P80 should be δ2. Is α in the non-circular flat cover calculation company on page P68 of GB150 wrong? I think it should be a. From * ao * Arrangement of ao