A method for coating a pipe (1) in the interior thereof, wherein the method has at least the following method steps: (i.) providing an immersion basin (2) which is filled with a coating liquid (3); (ii.) first immersion of the pipe (1) to be coated into the coating liquid (3); (iii.) first removal of the pipe (1) to be coated from the coating liquid (3) ensuring an angle (α) between the central axis (M) and the surface of the coating liquid (3) with 1°<(α)<30°; (iv.) second immersion of the pipe (1) to be coated into the coating liquid (3); (v.) second removal of the pipe (1) to be coated from the coating liquid (3) ensuring an angle (β) between the central axis (M) and the surface of the coating liquid (3) where −30°<(β)<−1°.
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1. A method of coating a pipe (1) in its interior, wherein the pipe (1) to be coated in its interior has
an outside (a) and an inside (b),
a first outer end (e1) at the first end of the pipe (1) and a second outer end (e2) at the second end of the pipe (1),
a length (L),
a first inside diameter (D1) at the first outer end of the pipe (1) and a second inside diameter (D2) at the second outer end of the pipe (1), and
a central axis (M),
wherein the method according to the disclosure is characterised in that the method has at least the following method steps:
(i.) providing an immersion basin (2) which
is filled with a coating liquid (3) up to a filling level (h), the coating liquid containing FeF3iron fluoride and paint particles in dispersion and
is suitable for receiving over its full length (L) the pipe (1) to be coated,
(ii.) first immersion of the pipe (1) to be coated into the coating liquid (3) in a chemical-based process,
(iii.) first removal of the pipe (1) to be coated from the coating liquid (3) ensuring an angle (α) between the central axis (M) and, the surface of the coating liquid (3), and the second outer end (e2) with 1°<(α)<30°,
(iv.) second immersion of the pipe (1) to be coated into the coating liquid (3) in a chemical-based process,
(v.) second removal of the pipe (1) to be coated from the coating liquid (3) ensuring an angle (β) between the central axis (M) and, the surface of the coating liquid (3), and the second outer end (e2) with −30°<(β)<−1°, and
(vi.) ensuring a filling level of the coating liquid (3) in the immersion basin (2) with (h)>(L)·sin(α) and (h)>(L)·sin(β).
2. A method of coating a pipe (1) in its interior according to
3. A method of coating a pipe (1) in its interior according to
4. A method of coating a pipe (1) in its interior according to
5. A method of coating a pipe (1) in its interior according to
6. A method of coating a pipe (1) in its interior according to
7. A method of coating a pipe (1) in its interior according to
8. A method of coating a pipe (1) in its interior according to
9. A method of coating a pipe (1) in its interior according to
10. A method of coating a pipe (1) in its interior according to
11. A method of coating a pipe (1) in its interior according to
12. A method of coating a pipe (1) in its interior according to
the immersion speed (v1) for first immersion,
the speed (v2) for the first removal,
the immersion speed (v3) for the second immersion, and
the speed (v4) for the second removal
are respectively in a range of 6 to 12 m/min.
13. A method of coating a pipe (1) in its interior according to
14. A method of coating a pipe (1) in its interior according to
15. A method of coating a pipe (1) in its interior according to
16. A method of coating a pipe (1) in its interior according to
0. 17. A method of coating a pipe (1) in its interior according to claim 1, where the coating liquid containing FeF3 iron fluoride and paint particles forms a layer containing iron and paint particles bonded to the outside and the inside of the pipe having a thickness on the inside of at least of 12.8 μm.
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This application
Ensuring a value for C in a range of 125 to 150, on the basis of an internally disposed corrosion protecting coating of such a configuration, provides for completely even and non-porous sealing means of the insides of the pipes (1), which no longer has the extinguishing medium carried by the pipes (1) infiltrating therebeneath even over many years, which applies even for the ends of the pipes (1), that are brought together in the couplings.
The pipes (1) produced in accordance with the method proposed here are practically unlimited in respect of their nominal size, in particular and preferably the pipes (1) should involve a nominal width (n) in a range of DN 32 to DN 250, which corresponds to the usual pipe nominal widths within the fire extinguishing systems which are particularly favoured as the application thereof from the main conduit, for example in the form of riser conduits, by way of possible secondary distribution pipes, for example in the form of distributor conduits, as far as the sprinkler connection pipes, for example in the form of branches (branch conduits). In a quite particularly preferred configuration the pipes (1) should be of a nominal width in a range of DN 32 to DN 65, which corresponds to the pipe nominal widths of usual secondary distribution pipes to the sprinkler connection pipes.
Following
The disclosure will be illustrated in greater detail by means of the Examples hereinafter. For that purpose longitudinally welded metal pipes which are each 9 m in length and which have a continuous nominal width (n) in a range of DN 15 and DN 32 respectively are placed on numerous Teflon-coated bar-like support holders of an immersion frame which is also Teflon-coated. The immersion frame is carried from above by means of a travelling carriage crane which is capable of individually lowering and raising both the front part and also the rear part of the immersion frame individually, wherein the respective first ends of the pipes (1), carried by the immersion frame with the support holders, and the respective second ends of the pipes (1) can be individually raised and lowered. The pipes (1) themselves are set up and oriented in space as shown in
In a plurality of successively connected immersion basins the pipes (1) are degreased and subjected to intermediate rinsing. In a further immersion basin (2) set up as shown in
The Examples as results of the tests performed confirm the recognitions of the present disclosure in an extremely vivid fashion. Below α, −β=1° the coating on the inside wall (b) of the pipes (1) turns out to be too thin and with flaws and cracks to be noted, the same applies for ranges above α, −β=30°. Within the claimed angle range of 1°<(α)<30° and −30°<(β)<−1° the coatings are uniform and homogeneous and at least in a range above 12.8 μm with a calculated value of C=125 as the constant for type and condition of the pipe in the Hazen-Williams formula. Within the preferred angle ranges of 1.8°<(α)<5.5° and −5.5°<(β)<−1.8° it is also possible to achieve coating thicknesses of more than 21 μm with a calculated value of C≥130. The coatings are absolutely uniform and homogeneous and free from any flaws, so that water cannot infiltrate under them even after years. Thus the basic problem of providing pipes (1) in general, which are free from corrosion even after a prolonged period of use and which thus permit a monetary improvement in the design and operation of fire protection installations is completely solved.
TABLE 1
Repetition
Residence time
frequency
per dip operation
Pipe
over the
Conveyor
in accordance
(1)-DN-
four method
speeds
with method steps
Ex-
Nominal
Angle
steps (ii.),
(v1 = v2 =
(ii.) with (iii.) and
∅-coating
Comments/
ample
width (n)
(α = −β)
(iii.), (iv.), (v.)
v3 = v4)
(iv.) with (v.)
thickness
assessment
1
32
0°
1
9 m/min
90 sec
8.5
μm
Pipes (1) partly
float up during
immersion, no
continuous and
flaw-free coating
2
32
2.5°
2
9 m/min
80 sec
28.0
μm
Excellent uniform
coating; C = 140
3
15
2.5°
1
9 m/min
90 sec
12.8
μm
Uniform coating;
C = 125
4
15
4.5°
3
9 m/min
60 sec
25.5
μm
Excellent uniform
coating; C = 140
5
15
10°
2
9 m/min
80 sec
13.5
μm
Uniform coating;
C = 125
6
32
4.5°
2
9 m/min
80 sec
21.5
μm
Excellent uniform
coating; C = 130
7
32
10°
4
9 m/min
60 sec
25.5
μm
Excellent uniform
coating; C = 130
8
32
20
2
9 m/min
80 sec
15.5
μm
Uniform coating;
C = 125
9
32
40°
3
9 m/min
60 sec
10.0
μm
Cracks and flaws
in the coating;
C = 105
10
32
45°
2
9 m/min
80 sec
8.5
μm
Cracks and flaws
in the coating;
C = 100
Steinhoff, Michael, Rönpagel, Andreas
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