These are the top-level, business-critical standards. They cover overarching themes such as HSSE (Health, Safety, Security, Environment), project management, and quality assurance. Example: DEP 30.00.00.10-Gen. (General Project Management)
A common confusion is that DEPs replace national codes. They don't. They work in a hierarchy: shell dep standards
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DEPs are extensive and cover virtually every aspect of heavy engineering: SHELL DEP STANDARS FOR PROCESS DIAGRAMS These are the top-level, business-critical standards