Should the positional deviation of the level gauge interface be specified on the pressure vessel design drawings?
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As the title suggests: Should the positional deviation of the level gauge interface be specified on the pressure vessel design drawings? Can it be submitted by the process team?
This is likely due to manufacturing tolerances in the device’s positioning; the piping layout should also take into account these tolerances of the device. It is best to specify this on the drawings in the equipment and submit it to the process team for confirmation.
This position deviation should be indicated on the equipment diagram, right?
In fact, for conventional level gauges, there are specific requirements regarding the deviation of the pipe outlet position in horizontal and vertical containers; these requirements ensure that the installation conditions for the level gauge are met. The design drawings indicate that compliance with such standards is sufficient. If the level gauge is particularly special and stricter requirements are imposed on the deviation of the pipe opening position, more specific provisions should be made in the design drawings; of course, these drawings must be approved by the instrumentation specialists.
I’ve seen quite a few foreign drawings; it seems some have markings and some don’t...
The drawing does not specify tolerances; this is to be addressed by the process team.
What is indicated in the design as a tolerance represents the dimension that needs to be strictly controlled； The design drawings should specify which standard or document governs the dimensional tolerances. For tolerances that are explicitly specified, strict control is required; those not specified shall be followed as per the documents. The main task of the manufacturing process is to realize the designer’s intentions; there may be variations during production, but as long as they remain within the specified tolerances, it is acceptable. . All of this should not be proposed by the process.
What is indicated in the design as a tolerance represents the dimension that needs to be strictly controlled； The design drawings should specify which standard or document governs the dimensional tolerances. For tolerances that are explicitly specified, strict control is required; those not specified shall be followed as per the documents. The main task of the manufacturing process is to realize the designer’s intentions; there may be variations during production, but as long as they remain within the specified tolerances, it is acceptable. . All of this should not be proposed by the process.
This requirement is already included in the adopted standards; is it necessary to specify it separately?
The introduction to GB150 explains the standard, stating that it cannot be used as a technical manual for the construction of specific pressure vessels. The installation accuracy requirements for the level gauge must be specified on the drawings.
There are numerous technical requirements specified in GB150 – why is only a level gauge required?