15 August 2002
distribution piping around the dock, 44.5- 63.5 mm (1-3/4 to 2-1/2 in), and
extensions to outlets 19.05-25.4 mm ( to 1 in)
It is standard practice to reduce the pipe size serving the more remote
outlets in accordance with the reduction in volume of gas to be delivered.
Valves. Use globe type shutoff valves, 2,758 kPa (400 psi), cold,
nonshock gas working pressure. Prefabricate valve assemblies in the shop to minimize
the possibility of leakage after fabrication.
Joints. Use tinned threaded joints, made up with litharge and glycerine.
Testing. Before outlets are attached, subject each section of line to an air
test at 861.84 kPa (125 psi).
Identification. Paint oxygen piping green and mark outlet valves "FOR
Acetylene. For acetylene piping, use standard weight, black steel with
beveled ends for welding.
Sizes. Generally provide these ranges of sizes:
main from supply to side of deck, 38.1 to 63.5 (1-1/2 to 2-1/2 in)
distribution piping around the dock, 25.4 to 50.8 mm (1 to 2 in), and
extensions to outlets, 19.05 to 25.4 mm ( to 1 in.)
Valves. Use forged or cast steel of the lubricated plug type cutoff valves.
Testing. After fabrication, but before attaching outlet equipment, test
each section of line with compressed air to 689.47 kPa (100 psi).
Identification. Paint acetylene piping yellow and mark the outlet valves
Supply. If not supplied in portable tanks, the required supply of oxygen
and acetylene may come from an existing yard system or be produced by stationary
Alternate System. If an existing system is not available, the choice
between installation of stationary generators or banks of tanks will depend on the
volume of gases required, estimated on both daily and weekly consumption rate.
Where an appreciable volume of gas is required per week, it may be produced by
stationary generators more economically than if supplied by tanks.