It is critical to understand that is not the same as ISO 10628-1. While South Africa often harmonizes with ISO, SANS 1186-5 retains specific modifications for old legacy plants.
Typically every 5 to 7 years. However, amendments (e.g., adding symbols for smart actuators) may be issued as separate slips. The SABS sends email alerts to purchasers of the PDF.
If you download a generic "ISO valve symbols" PDF, you may be missing the specific SANS annotations that judges look for in a legal dispute.