The flange standard is ASME B16.5, 18 inches
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I’m asking the experts here; I’ve searched for a long time but couldn’t find where the tolerance for the outer diameter of the outer circle is specified. Please point it out, thank you
After checking carefully, there indeed are none. What is a free tolerance? Also, in the latest flange standard GB/T9113-2010, it seems that no tolerance specifications are provided
The so-called free tolerance refers to GB/T1804; generally, the M grade is used, with a tolerance of ±0.5 mm
Well, it was determined according to ISO-2768M, and the customer has been informed
Plus or minus 0.5mm? Is 1 mm positive or negative considered acceptable?
The ASME B16.5 standard does not specify tolerances for the outer diameter of flanges; generally, they can be manufactured to Class 14 tolerances. However, certain manufacturing processes need to be taken into consideration. For example, if you use the outer diameter of the flange as a reference for drilling the flange holes, you need to control that outer diameter, otherwise the holes will be eccentric.
Isn’t a tolerance of 7.3 specified? How is it that it can’t be found?
Sorry, the end-to-end tolerance for 7.2 doesn’t match~ (d) End-to-End (Ring Joint): NPS ≤ 10 ±2.0 mm (±0.06 in.) NPS ≥ 12 ±3.0 mm (±0.12 in.)
This is the total length tolerance of the flange, generally referring to mating flanges. The total length of the valve is determined by the ASME B16.10 standard.