Compressed Air Work And Diving 1909
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AIR COMPRESSORS.
111
to the contractors, Messrs John Cochrane & Son. They
also supplied Messrs S. Pearson & Son with the com-
pressors for the Blackwall Tunnel, and Messrs Price
& Reeves with those for the Rotherhithe Tunnel. Those
for the Blackwall Tunnel had steam cylinders H.P. 24 in.
diameter, and L.P. 40 in. diameter, and air cylinders
24 in. diameter with a stroke of 3 ft. 6 in.
The Rotherhithe Tunnel compressors had steam
cylinders H.P. 18 in. diameter, and L.P. 34 in. diameter,
and air cylinders 30 in. diameter with a length of stroke
of 3 ft. 6 in.
The Blackwall Tunnel compressors were water-coolecl
by means of a water injection into the cylinders. The
makers, however, clo not usually recommend this, owing
to the cletrimental effect upon the valves and seatings,
and the anthor has been informeel by Mr Moir that the
economy resulting from this method of cooling was
exceeclingly small.
For the sinkino- of the King- Edward Bridge caissons
electric driven one-stage compressors were used, and
these had 15-in. diameter air cylinders with a 3-ft. stroke.
These were supplied to the contractors, Messrs The
Cleveland Bridge and Engineering Co., by the Airdrie
Iron Co. They were rim at a constant speed and the
pressure regulated by the air lifting the valves and
causing the engines to run light. The valves were of
the Riedler type.