BSI allows a free 20-minute online preview of any standard. For BS 6164:2019, you can see the table of contents, foreword, and a few key clauses. This is ideal for verifying if you need the full document.
Specifies minimum fresh air requirements: 0.3 m³/s per person working, plus additional for diesel engines (0.06 m³/s per kW). Continuous gas monitoring for CO, CO₂, NO₂, and H₂S. Alarm levels defined. bs 6164 safety in tunneling pdf free download
Understanding BS 6164: The Standard for Safety in Tunnelling BS 6164:2019 standard, titled BSI allows a free 20-minute online preview of any standard