What is the actual length of the pressure vessel device than the length of the drawing?
This is standard, but it's more subtle: GB150 refers to JB/T4731, JB/T4710, and I looked at the next JB/T4731, section 8, which specifies the tolerance requirements for the length, as shown in figure 8-1. GB150 is mandatory, citing the JB/T4731 and other specifications, which indicate that the requirements for these standards are also mandatory. So you can look at these criteria for size tolerance control, and of course there are similar rules in HG20584, you can also look at it.
This depends on what you say on the pressure vessel drawing, which is made, tested and checked by that standard. In GB150, the limit deviation of the linear dimension of machining surface and non-machined surfaces is specified in GB / 1804, respectively.
According to the design requirements, drawings marked (generally for one over one thousand of the total), but some equipment have special requirements, such as volume demands very accurate, is far less than this value.
