11.
87
Pipes & Joints.
for the anchor blocks.
The mud sections would also be dredged and the broken stone foundations would be deposited and trimmed ready for the pipes.
The anchor blocks Type B. would then be temporarily deposited immediately adjacent to the positions already marked for them by the small position blocks and the section distances
would be accurately determined.
Wire would now be stretched tightly between the anchor blocks and the line would be examined for uniformity of level and for obstruction. Any serious projection would
be removed and any serious depression would be filled with
sand or broken stone, but it is not anticipated that much levelling would be necessary.
While the above work on the blocks and line was
proceeding the necessary pipes, flanged and flexible ball
and socket joints, and valves, would be manufactured in
England for urgent delivery.
The pipes which would be of lapwelded steel in
thickness with an inside diameter of 123 inches would be
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11
lined with cement concrete thick, giving an effective
internal diameter of 12 inches and would be in lengths of
twenty to twenty five feet.
The outside of the pipes would be protected by
double wrapping of hessian cloth drawm through hot bituma stic
solution, and the joints would be of the welded type with
the exception of the two end joints on each hundred and fifty
feet section, which would be of the loose flange type.
This pipe would weigh 69 lbs. and 119 lbs. per foot
run in air when empty and full respectively and would weight
6 lbs. and 56 lbs. per foot run in water when empty and full
respectively.