BS 4001-2:1967

Cooperating organizations
Foreword
Recommendations
1. General
1.1 Scope
1.2 General
2. Helmet and corselet
2.1 Outlet valve
2.2 Inlet valve
2.3 Helmet shell
2.4 Windows
2.5 Corselet and brasses
2.6 Care after diving
3. Diving dress
3.1 Storage
3.2 Washing and cleaning
3.3 Dress repairs
3.4 Re-cuffing
4. Boots, belts, weights, etc.
4.1 Boots
4.2 Belts and weights
4.3 Knives
4.4 Wrist bands
5. Diving air hose
5.1 Before use
5.2 General
5.3 Storage
5.4 End fitting and adaptors
6. Divers' air supplies
6.1 Manual air pumps
6.2 Compressors
6.3 Air reservoirs
6.4 Pressure relief devices
6.5 Compressed air cylinders
6.6 Pressure gauges
7. Divers' communications
7.1 Telephone
7.2 Telephone breast rope
7.3 Life-line
7.4 Strength of telephone breast rope and life-line
Appendices
A. Recommendations for the three month periodical
    examination of diving equipment
A.1 General
A.2 Helmet and corselet
A.3 Diving dress
A.4 Boots, belts, weights, etc.
A.5 Air hose and connections
A.6 Divers' communications
A.7 Air compressing plant
B. Manual air pump efficiency test
B.1 Frequency of test
B.2 Required efficiency
B.3 Efficiency test
B.4 Gas meter method
B.5 Pressure method
B.6 Calculation of pump revolutions for a given
      supply of air
C. Compressed air for human respiration
C.1 Compression of atmospheric air
C.2 Purity of the breathing air
D. Metric conversions

Deals with all the major components of the helmet-type apparatus, including divers\' air supplies, to ensure the safety of personnel. Appendices contain recommendations for the statutory three-month periodical examination; manual air pump efficiency test; the purity of breathing air.