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It has been superseded by the European standard ( GRP tanks and vessels for use above ground ). BS EN 13121 builds upon the principles of BS 4994 but incorporates modern advanced stress analysis, updated resin classifications, and harmonized European safety frameworks (including the Pressure Equipment Directive). BS 4994 (Legacy) BS EN 13121 (Modern) Status Withdrawn (but still used in legacy specifications) Active and Current Calculation Base Unit property method (glass weight) Laminate analysis / Thin shell theory Testing Regimes Destructive laminate tests Advanced non-destructive testing (NDT) bs 4994 pdf free
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