Which of the following is a quality control element?

According to API Std 936, the quality control program includes several essential elements to ensure compliance with material specifications and installation procedures. These elements include:

"Key quality control activities include, but are not limited to: material qualification testing, initial inspection, installation monitoring, and as-installed testing."

— API Std 936, Section 4.1, Quality Control Program​

Although documentation is essential, report writing is not listed as a core quality control element within this section. Therefore, A, B, and C are the correct answers.

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