. Mechanical Contracting & Plumbing January-December 1909. he two photo-graphs throughout this article, I shallrefer to them as Fig. 1 and Fig. 2. Itrequired some time before I was ableto secure two photographs of pipe endswhich would illustrate this article. Effect on Iron Pipe. Fig. 1 shows two sections of iron pipe which were cut at ran-dom from a length af pipe used as acold water service pipe. The outsidesurface of the pipe would suggest itshaving buried in the ground, causing itto rust, but this particular pipe wassuspended from the floor timbers over-head in the cellar. You wi
. Mechanical Contracting & Plumbing January-December 1909. he two photo-graphs throughout this article, I shallrefer to them as Fig. 1 and Fig. 2. Itrequired some time before I was ableto secure two photographs of pipe endswhich would illustrate this article. Effect on Iron Pipe. Fig. 1 shows two sections of iron pipe which were cut at ran-dom from a length af pipe used as acold water service pipe. The outsidesurface of the pipe would suggest itshaving buried in the ground, causing itto rust, but this particular pipe wassuspended from the floor timbers over-head in the cellar. You will notice howregular the deposit is in both pieces ofpipe, working from the sides to thecentre of the pipe. This was a plainiron service pipe and,was in actual useabout 15 years. Effect on Brass Pipe. Fig. 2 shows the spud ends of a pairof 1-in. brass stove couplings whichwere screwed into the cast iron waterfront of a stove. They are placed inthe photo in their relative position, thetop coupling being the flow and thebottom one the return or bottom pipe. Fig. 1.—Examples of So-called Corro-sion. connection between stove and were in use about three years. Thetop coupling in Fig. 2 shows less stop-page or formation than the lower. Thismay be accounted for by the fact thatthe movement or velocity of flowis greater in this pipe than in the lower pipe, owing to the ex-pansion of the water as it be-comes heated in the water front. Nowthe stoppage of the couplings was notdue to corrosion, as they had not de-teriorated. The entire matter formingthe stoppage was of foreign doubt it contained a percen-tage of oxide of iron, but this was onlyone constituent part. A short distancefrom the end the bore of the couplingwas entirely clear, showing this wasclearly a case of stoppage and not cor-rosion. It is not natural for brass tocorrode in this particular manner. Asa rule, the interior bore of brass pipesthrough which water passes is wornaway. The oxide of ir
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