How to deal with this?
Thread Content
There is a project with a design pressure of 135 bar and a design temperature of 150； The project design specifications are prepared in accordance with GB standards, whereas the project’s pipeline technical specifications follow EU standards DIN ； (Chaotic!) 1.4404 grade steel was purchased for the pipes (which corresponds to 316L); due to material constraints, SS316L was used for the flanges, with dimensions based on the thickness specifications of the old HG20592 standard. The aforementioned incoming materials are problem-free ； But the problem lies with the bolts ； The bolts purchased are made of 25CrMo4 (Din standard), with a tensile strength of around 700 Mpa and a yield strength of around 500 Mpa. May I ask if the bolts can be used? It is in such situations that the issue arises regarding whether the bolts meet those acceptance specifications.
Such issues would need to be clarified with the designer, right? Shouldn’t the designers follow the requirements of the project specifications when carrying out the design? It’s unreasonable to use so many standards together in one project, right? There is too little preliminary work for the project.
The design unit should provide a briefing.
To determine what type of structure Flan is, SO and WN can use this stud; as for the acceptance criteria, they will be determined by the design.
Proceed in accordance with the design requirements; if the purchased items do not match the design, a material change request form must be submitted to obtain written approval from the design unit.
No adjustments were made to the project, and all the relevant documents were simply sent to the Special Inspection Institute. The special inspection agency didn’t detect it. The Special Inspection Agency needs food and drink. The GC1 pipeline is treated in the same way; how will the industry develop?
The design cannot be changed; if changes are desired, it must be redesigned in accordance with DIN standards. Not eligible. Designed according to GB, a problem arises: when foreign materials are used, their performance must be no lower than the performance requirements of the corresponding domestic materials. The bolts of DIN standard are only grade 4.8, which does not meet the requirement of at least grade 8.8 per GB standards. :Q:Q:Q:Q:Q