| http://www.w3.org/ns/prov#value | - These tanks were constucted before,but due to lack of inspection over them,poor quality of workmanship and making the mistake of choosing some improper materials and filler metal in some parts,the company decided to repair everything such as welding and replacing proper materials and finally checking of their Plumbness and Roundness.yours, Pardiss RE: Plumbness & Roundness(API 620)
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