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The Patent Shaft and Axletree Co. Ltd. to
Major Smith.
LIBAS OF TIMDAR K SI HOTA
voy hol va uedut oily
0B5 3 to ast".
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font CA 91
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Wednesbury.
January 20th. 1908.
88
Dear Sir,
We are in receipt of your favour of even date
with reference to thickness of hydraulic tubing to stand
a continuous working pressure of 800 lbs. per square
inch and in reply have to state that we invariably make
a practice of specifying these tubes of such a thickness
as to prevent any trouble whilst under working operations.
Although the sizes mentioned by you, viz:- 5" and 6", are
above those we employ at our hydraulic installations, we
have no hesitation in stating that for these diameters
we should specify not less than 5/16" thick; for the 6"
preferably 3/8" thick.
The water hammer in hydraulic pipes is a very
serious matter and unless pipes are made of sufficient
strength to withstand this severe usage they are liable
to leak and in many instances rip up from top to bottom,
Yours truly,
(Sga.)
J. F. Cay
-5-
for the Company,
Page 90Page 91