BS 7206:1990

Foreword
Committees responsible
Specification
Section one. General
1 Scope
2 Definitions
3 Classification
Section two. Materials, design and marking
4 Effect of non-metallic materials on water quality
5 Water connections
6 Hot water draw-off
7 Drain tap
8 Direct heating by electricity
9 Direct heating by gas
10 Indirect heating
11 Safety devices
12 Controls
13 Thermal insulation
14 Marking
15 Instruction manual
Section three. Performance
16 Performance requirements to be verified by
    production tests
17 Performance requirements to be verified by type
    tests
Section four. Construction
18 Construction of copper storage cylinders
19 Construction of vitreous enamel lined steel storage
    cylinders
20 Construction of polyethylene lined steel storage
    cylinders
21 Construction of cementitious lined steel storage
    cylinders
Appendices
A Method of determination of draw-off of unit/package
B Method of determination of heating capacity of
    primary heaters
C Method of measurement of hot water output of direct
    gas-fired storage water heaters
D Method of determination of suitability of materials
    for long-term hot water storage
E Method of determination of performance of controls
    and safety devices
F Method of determination of continuity of
    polyethylene lining
G Vacuum test on polyethylene lining
H Method of measurement of thickness of cementitious
    lining
Tables
1 Minimum length of thread
2 Minimum tail length
3 Pressure valve settings and working pressures
4 Nominal thickness of body sheet and minimum
    thickness after forming of ends
5 Adjusted draw-off rate
Figures
1 Typical units and packages
2 Copper primary heaters
3 Apparatus for determining draw-off rate and heat
    capacity

Requirements for units and packages heated directly by gas or electricity, or indirectly heated. The cylinders have a capacity between 15 and 500 L, having a minimum opening pressure of 1.0 bar and a minimum working pressure of either 3 or 6 bar, fitted with safety devices to prevent water temperature from exceeding 100°C.