BS 3636:1963

Co-operating organizations
Foreword
Introduction
      Gas tightness
      Units
      Symbols
      Definitions
      Designation of proving methods
      Review of proving methods
      Gas tightness of test apparatus
      Leak location
      Comparison of proving methods
Vacuum methods
V.1 Pumping
V.2 Pressure rise
VS.1 Infra-red absorption (plant evacuated)
VS.2 Halide diode
VS.3 Mass spectrometer
VS.4 Thermal conductivity vacuum gauge
      A. Fitted to plant
      B. Specially adapted for leakage probing
VS.5 Ionization vacuum gauge
VS.6 Ionization vacuum gauge with palladium barrier
VS.7 Thermionic cathode diode vacuum gauge
Pressure methods
Precautions against rupture of pressurized plant
P.1 Flow rate
P.2 Pressure drop
      A. With constant temperature
      B. With varying temperature
PS.1 Infra-red absorption, flow measurement
      A. Plant pressurized
      B. Hood pressurized
PS.2 Infra-red absorption, accumulation
      A. Plant pressurized
      B. Hood presurized
Appendices
A Design of plant bearing in mind the need for
      proving
B Recommendations relating to contracts
C Blockage of capillary leaks
D Comparison of leak rates of different fluids
E Method V.2 pressure rise: time saving techniques
      in the presence of outgassing
F Method V.2 pressure rise: check for leakage across
      the isolating valve
G Search gas methods: pumping systems
H Search gas methods: best pumping speed
J Reference leaks
K The refrigerated trap
L The chemical trap
M The charcoal trap
N Worked examples
O Leak location
P Safety precautions
Q Bibliography
R Conversion factors
Index

Ten methods for application to evacuated plant, seven to pressurized plant. Five involve direct measurement of quantities but are insensitive or lengthy. Others use search gas and detectors sensitive to such gas. Four use vacuum gauges which may be able to serve another purpose on plant. Each method describes apparatus, special precautions, procedure, interpretation of results, working principles, sensitivity. Design of plant; contracts; blockage of capillary leaks; leak rates of different fluids; worked examples; safety precautions; bibliography; methods of leak location.