16MnR belongs to the category with a tensile strength limit of 540 Mpa
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16MnR belongs to the category with a tensile strength limit of 540 Mpa
16MnR is a material with an ultimate tensile strength of 540 Mpa. For steel plates used in pressure vessels, 16MnR (hot-rolled, controlled-pressure rolled, or normalized), the tensile strength ranges from 450 to 640 Mpa for plate thicknesses between 6 and 120 mm
However, the inspection regulations require that spherical tanks made of materials with a tensile strength limit of 540 Mpa or higher be inspected after one year of operation. (Our company has several pressure spherical tanks made of 16MnR material, and the inspection agency has specified that an inspection should be carried out after one year of use. Their reasoning is that 16MnR is a material whose tensile strength limit is 540 Mpa. Is this reasonable, gentlemen? Is it still acceptable?)
According to the standard specifications, their understanding of tensile strength is biased; the standards specify a lower limit for tensile strength, and it is clear that the lower limit for the tensile strength of 16MnR is below 540 MPa. But if the inspection period is set for 1 year, I don’t think there’s any problem with that; everyone can simply reach an agreement through discussion. If they insist on using tensile strength as a criterion, you can argue with them about it as well
These issues, just like the lack of regulation for certain devices, require oversight – is it only for the sake of inspection fees? If it can be negotiated, don’t offend them.
It is unreasonable; the minimum tensile strength of 16MnR is below 540. Inspection agencies want to have more control – of course, it’s for money – but they aren’t held accountable if something goes wrong with the equipment they inspect. Since it is stipulated that inspection without opening the container is allowed, you can certainly refuse (which might lead them to cause you trouble in other ways). Of course, it’s always good to have an extra check, as long as your company is willing.
It's better to get a standard response by going to the bidding meeting.....