(5)
In my long experience, no lap-welded pipes,
In the
of diameters approaching to those now in question, have ever failed, either in colonial works, or in those in this country, with which I have been connected. case of smaller diameters, say up to one-inch, or even one-and-half inch butt-welded pipes, have often been used, because the margin of safety, in the case of so small pipes, is very large owing to the fact that it is impossible to
What has manufacture a pipe, which is not amply strong.
to be guarded against is failure from external corrosion, rather than from hydraulic pressure.
Mr. Chatham's remark that butt-welded pipes were substituted on account of economy is scarcely correct inasmuch as butt-welded pipes of this size are much more costly to manufacture than lap-welded.
The question of butt-welded pipes having been shipped in the same vessel and delivered by mistake has been referred to Mesers, Freeland but as yet I have received
no answer.
I have the honour to be,
Gentlemen,
Your obedient servant,
bəbert. Chadwick.
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