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Патент USA US2124520

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July 19, 1938.
F. N. SPELLER:
METHOD
2,124,520 v
OF MAKING GALVANIZED FERROUS PIPE
,
Filed Sept. 1, 1936
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IN VEN TOR.‘
FE?NK' N. 5PEL LEE.
Ml
2,124,520
Patented July; 19, 1938
PATENT OFFICE
UNITED STATES
_
2,124,520
nm'rnon or MAKING csnvsmznn
FERBOUSPIPE
Frank N. speller, Pittsburgh, Pa., assignor to Na
tional Tube Company, a corporation of New
Jersey
Application September 1, 1936, Serial No. 98,990
a
‘(01. ill-70.2)
This invention relates to galvanized ferrous
pipe, one of the objects being to increase the
service life of such pipe.
'
.
of the same, this shaft being rotated by a suit
able device l.
The arms I may be raised into
alignment with declining skids 5 which lead to
According to the invention, ferrous pipe is gal-' > a series of spaced rollers 6 powered by a motor
‘I and adapted to horizontally receive the pipe 5'
5 vanized by the conventional hot-dip method ex
cepting that the pipe is removed from the molten
zinc in a horizontal position so as to retard the
gravitational ?ow of zinc from its surfaces, the
pipe being continuously rotated during the solid
10 i?cation of the zinc on its surface andcontinu
ously maintained in a horizontal position until
this solidi?cation is completed. Preferably, the
pipe is rotated at su?icient speed to assure a uni
form distribution of the zinc over its surfaces but
15 at an insu?icient speed to assure any material
centrifugal e?ect on this zinc. This procedure
9
between them and rotate the same.
In use, the pipe is placed in the zinc in the '
kettle ‘i for a suitable length of time and is then
removed by raising the arms I, this automatically
starting the pipe to rotate due‘ to the shape of 10
these_arms. Upon removal from the zinc the
pipe runs relatively slowly down the skids 5 and
between the rollers 6.- Here the pipe is rotated
until the zinc solidi?es. The pipe is horizontal
at all times and the zinc is not wiped from its 15
surfaces. 'lhe advantages of this procedure have
results in the pipe having relatively heavy layers
already been described.
of free zinc on its surfaces and in a uniform dis
Figures 3 andv 4 illustrate the pipe 8 as being
provided with caps 9 which may be ?xed to the
ends of the pipe in any manner, as by a, threaded 20
engagement with the same, each of these caps
tribution of the zinc over its surfaces from end
*9 to end and on both its inside and outside.
It has been found that pure zinc provides much
’
being provided with a concentric opening it.
the» zinc and iron alloy which prevails at the Assuming the pipe to be fitted with these caps
junction between the zinc and .the ferrous pipe _ and handled by the apparatus illustrated by Fig
25 it covers. ‘By the above described procedure pipe ures 1 and 2 in the aforementioned manner, the
is obtained having a much greater thickness of pipe receives a thicker coating of zinc inside than
free zinc than can result when pipe is dipped by it does outside. Obviously, the zinc is uniformly
distributed from end to end of the pipe.
the usual methods.
I claim: .
A modification of the above may consist. in
1. A method of hot-dip galvanized ferrous pipe
' 39 providing a suitable means for retaining a pre
determined amount of molten zinc inside the including dipping the pipe in molten zinc, remov
ing the pipe from the molten zinc in horizontal
pipe, and in then rotating this pipe .until solid
i?cation of the zinc is completed. This provides position and rotating said pipe while continu
for a greater thickness of zinc on the inside of ously maintaining it in a horizontal position dur
35 the pipe than can otherwise be obtained and, at ing the solidi?cation of zinc on its surfaces.
2. A method of hot-dip galvanizing ferrous
the same time, assures a uniform distribution of
pipe, including dipping the pipe in molten zinc,
the zinc from end to end of the pipe.
removing the pipe horizontally from the molten
In the drawing, Figure 1 is a top plan of suit
zinc while positively obstructing its ends to an
able apparatus for rotating the pipe being coat
40 ed; Figure 2 is a side elevation of the apparatus extent sufficient to retain a greater quantity of
of Figure 1: Figure 3 shows how the zinc may zinc inside the pipe than if the ends were completely open and rotating the pipe during solidi
be retained in the pipe after it has been're
moved from the usual bath of molten zinc; and ?cation of the zinc thus retained inside the pipe.
3. A method of hot-dip galvanizing ferrous
Figure 4 is a sectional view taken on the line
pipe, including dipping the pipe in molten zinc,
45 IV-IV of Figure 3. '
.
'l
_
The apparatus illustrated by Figures land 2 removing the pipe horizontally from the molten
includes a zinc kettle l adapted to contain the zinc and rotating the pipe during its removal
molten zinc in which the pipe is dipped. A shaft from the zinc and thereafter until the zinc re
I runs parallel one edge of this kettle and carries tained on the surfaces of the pipe is solidi?ed.
'
FRANK N. SPELLER.
5° ‘arms 8 adapted to lift the pipe horizentally out _
greater protection against corrosion than does
25
.
30
35
40
.4
45
.
60
CERTIFICATE OF CORRECTION .
‘Patent No. 2,12%520.
'
FRANK N.
w
SPELLER.
July 19, 1958.
I
.
‘It is hereby certified that error appears in the printed specification
of the above number ed patent requiring correction as. follows: ‘Page 1, second
column, line 50, olaiml, for the word. "galvanized" read galvanizing; and
that the said Letters Patent should'be readwith this correction therein
that the same may conform to the record of the case in the Patent“ Office.
Signed and sealed this 50th day of August, A, D. 1958.
Henry Van Arsdale
(Seal)
Acting Commissioner 'of Patents.
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