Seeking help for retesting
Thread Content
I would like to ask everyone: Are the technical requirements for items 1, 2, 4, and 5 in the images above subject to re-inspection upon arrival at the factory, or can the steel plates and purchased components be used directly as long as their certificates of conformity include these inspection items? Thank you!
For equipment operating in wet hydrogen sulfide conditions, the quality certification documents provided by the supplier are sufficient, unless you consider those documents to be unreliable.
1. When manufacturing, modifying, or repairing units are unable to determine the authenticity of the quality certificate or have doubts regarding the performance or chemical composition, they shall conduct re-inspection. 2. The Class IV forgings used for externally purchased third-class pressure vessels shall be retested. For the others, it is not mandatory; as long as it is specified in the material certificate and meets the requirements, that is sufficient.
There are more than just these retests for wet hydrogen sulfide environments; typically, owners require dual C testing (NACE MR0175). The hardness of the material, chemical elements, etc., all need to be retested.
This post was last edited by wanlirn on 2023-11-24 at 13:05. Re-testing is required except for the first item; in practice, this means that tensile tests must be conducted on the purchased materials. The carbon equivalent also needs to be calculated using the actual chemical composition according to formulas, and it must meet the requirements specified in the drawings. For other materials, it is sufficient if the information provided in their certification meets the requirements. If the inspection items listed in the material certification do not meet the requirements, re-testing is necessary – for example, for the fourth item, the steel factory only conducts tests at 0 degrees of impact.
You still lack one; it’s required by the design documents
Follow the rules for the 3rd floor; only those with the words \"re-inspection\" specified in the drawings/agreements/contracts require re-inspection. For the rest, ask the material supplier to provide proof at the time of material pickup, and if no proof is provided, one must conduct the inspection oneself
When submitting the materials, communicate the requirements to the supplier; it is sufficient if their material certificates or approval documents meet the requirements. If some of them do not meet the criteria, re-inspection will be necessary