KR102043285B1

KR102043285B1 - Ultra-high molecular weight polyethylene lined pipe and manufacturing method thereof

Info

Publication number: KR102043285B1
Application number: KR1020130125414A
Authority: KR
Inventors: 이준호
Original assignee: 이준호
Priority date: 2013-10-21
Filing date: 2013-10-21
Publication date: 2019-11-11
Also published as: KR20150045757A

Abstract

The present invention relates to an ultra-high molecular weight polyethylene lined pipe and a manufacturing method thereof.
Ultra-high density polyethylene line comprising a double tube by combining an ultra-high molecular weight polyethylene liner 3 inside a carbon steel pipe 1 having flanges 2 at both ends. De pipe.
As described above, the present invention is excellent in chemical resistance, and has the best wear resistance and impact resistance among existing polymers, and has a friction coefficient close to zero, so that no foreign matter is attached. Economic effect can be achieved.

Description

Ultra-high molecular weight polyethylene lined pipe and manufacturing method

The present invention relates to an ultra-high molecular weight polyethylene lined pipe and a manufacturing method thereof, and more particularly, to an ultra-high density polyethylene liner (Ultra-high) inside a carbon steel pipe. Combining molecular weight polyethylene liner (hereinafter abbreviated as 'UHMWPE liner') as a double tube, it has excellent chemical resistance and wear resistance superior to stainless steel, and has the best impact resistance and coefficient of friction near zero, so no foreign matter is attached. The present invention relates to an ultra-high molecular weight polyethylene lined pipe and a method for producing the same, which have no harmful effects on contact with food due to cold resistance and non-toxicity, and have an economic effect with a semi-permanent life.

Conventionally, some pipes were manufactured by using a polyethylene coating (coating thickness of 0.8 mm to 1.2 mm) and a rubber treatment method as a pipe for transporting a fluid such as a basic compound, but using a conventional pipe. Soon after, corrosion occurred.

In addition, the conventional pipe has a weak resistance to corrosion and was not excellent in chemical resistance, weak in physical impact, short in life, weak in freezing, and poor in heat retention.

In particular, when transporting sludge from the desulfurization facility of a power plant, the sludge is mainly composed of sulfur oxides, so that the abrasion of the transfer pipe is extremely high, so that corrosion occurs easily and the life is very short. will be.

Therefore, the present invention for solving the above problems by combining a high-density polyethylene liner (Ultra-high molecular weight polyethylene Liner) in the inside of the metal pipe (Cabon Steel Pipe) to constitute a double tube excellent chemical resistance and wear resistance than stainless Ultra-high molecular weight polyethylene lined pipe with excellent impact resistance and coefficient of friction close to zero, no foreign matter attached, cold-resistant and non-toxic, no harm to food, and economic effect with semi-permanent life To provide a (Lined pipe) and a method for producing the same.

As a first embodiment for achieving the object of the present invention, it is composed of a double tube by combining an ultra-high molecular weight polyethylene liner in the inside of a carbon steel pipe (Cabon Steel Pipe) having a flange at both ends.

As a second embodiment for achieving the object of the present invention, a metal tube made of a metal material is cut to the specification and dimensions to be used, and then fixed and coupled by electric arc welding so that the flange is perpendicular to both ends, and inserted into the metal tube. A first process of manufacturing to a standard and a dimension to be used as an ultra-high molecular weight polyethylene liner (hereinafter also referred to as 'UHMWPE liner');

A second step of completely contacting the 'UHMWPE liner' on the inner surface of the metal tube;

A third step of cutting the UHMWPE liner inserted into the metal pipe by the second process, leaving only a portion to be flared on both sides of the metal pipe with respect to the flange surface;

A fourth step of applying heat at a predetermined temperature to the portion to be flared of the UHMWPE liner;

After the heat is applied to the part to be flared out like a fallopian tube, it is made of a fifth process of flaring by the pressure of the hydraulic cylinder with a flaring mold and pressing and bonding to the outer surface of the flange,

After attaching the metal tube to the drawing machine in the second process, the manufactured UHMWPE liner has an outer diameter of 0.02 mm to 0.09 mm larger than the inner diameter of the metal tube, and the inlet passes through an axial diameter die having a fallopian tube shape and is inserted into the metal tube. The process of doing so,

Stabilizing physical deformation caused by passing the shaft diameter die by applying heat at 150 ° C. to 170 ° C. for 3 to 4 minutes through the inner diameter of the UHMWPE liner in the third step;

In the fourth process, a portion of the UHMWPE liner to be flared is manufactured by a process of constantly applying heat for 5 minutes by indirect heat of 180 ° C to 200 ° C.

According to the invention,

First, by inserting and combining ultra-high molecular weight polyethylene liner inside the metal tube made of metal material, it has excellent chemical resistance as well as excellent abrasion resistance. In particular, it is suitable for use as a transfer pipe for transporting sludge in a desulfurization plant of a power plant.

Secondly, it is cold-resistant and non-toxic, so it is harmless to contact with food, it has economic effect with semi-permanent lifespan, and it is suitable for any kind of acid, alkali, basic compound with remarkable resistance to corrosion, and corrosion or physical shock suddenly It is suitable for use in steel making, chemical plant, and nuclear power plant equipment that is easy to generate, and because the internal ultra-high molecular weight polyethylene liner maintains a constant pressure, ultra-high molecular liner The durability of the weight polyethylene liner is semi-permanent and does not click or break under sudden impact.

Third, the inner surface is smooth in transporting sludge (sludge) fluid material in power plant desulfurization facilities mainly composed of sulfur oxides, so it has low frictional resistance and no deposits are formed. By keeping it as it is, the transport flow rate is very large.

Fourth, the metal tube and the ultra-high molecular weight polyethylene liner is combined, the thermal expansion characteristics are the same as the metal tube and can be protected from freezing.

Ultra-high molecular weight polyethylene liner has very low thermal conductivity and excellent thermal insulation effect, conserving energy of transport fluid.

Fifth, by combining the metal tube with the ultra-high molecular weight polyethylene liner, it has precise adhesion between the inner diameter of the metal tube and the outer diameter of the UHMWPE liner, so there are no gaps or gaps. It is easy to construct, high safety, semi-permanent durability, and provides high economic benefit to users.

1 is a cross-sectional view of a part of the "ultra high density polyethylene lined pipe" in the "ultra high density polyethylene lined pipe and manufacturing method thereof" according to the present invention.
Figure 2 is an overall cross-sectional view of the "ultra high density polyethylene lined pipe" in the "ultra high density polyethylene lined pipe and manufacturing method thereof" according to the present invention.
3 is a cross-sectional view showing a first process for producing the "ultra high density polyethylene lined pipe" according to the present invention before the ultra high density polyethylene liner is inserted into the metal tube.
Figure 4 is a cross-sectional view showing a second process for producing the "ultra high density polyethylene lined pipe" according to the present invention is a state diagram of inserting the ultra high density polyethylene liner into the metal through the shaft diameter die.
FIG. 5 is a cross-sectional view showing a third and fourth process for producing an “ultra high density polyethylene lined pipe” according to the present invention, in which an ultra high density polyethylene liner inserted into a metal tube is to be flared at the end of the metal tube. It is a state diagram that cuts leaving a bay, applies heat through an inner diameter, and applies indirect heat to a portion to be flared.
Figure 6 is a cross-sectional view showing a fifth process for producing "ultra high density polyethylene lined pipe" according to the present invention, after folding the portion to be flared of the ultra-high density polyethylene liner like a fallopian tube, the pressure of the hydraulic cylinder with a flaring mold It is a state diagram which flares and compresses and binds to the outer surface of a flange.
Figure 7 is a cross-sectional view showing the finished product of "ultra high density polyethylene lined pipe" according to the present invention.

Hereinafter, described in detail with reference to the accompanying drawings shown as a preferred embodiment as follows.

First, specific embodiments of the present invention will be described with reference to FIGS. 1 to 7.

Terms defined in the description of the present invention are defined in consideration of functions and forms in the present invention, and should not be understood as meanings that limit the technical components of the present invention.

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In addition, in the drawings, the components are exaggerated in size (or thick) in size (or thick) in size (or thin) or simplified in consideration of the convenience of understanding and the like, thereby limiting the scope of protection of the present invention. It should not be.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. .

Ultra-high molecular liner (Ultra-high molecular) inside the carbon steel pipe (1) of carbon steel having a flange (2) at both ends as shown in Figure 1 to 2 attached as a first embodiment of the present invention weight polyethylene Liner) (3) is combined to form a double tube.

The "ultra-high molecular weight polyethylene lined pipe" of the present invention as described above is an ultra-high molecular weight polyethylene liner (3) inside the carbon steel pipe (3) (3). Combination of) provides excellent chemical resistance as well as the best wear resistance, the highest impact resistance and the coefficient of friction of the existing polymers, so that no foreign matter is attached. Economic life can be achieved by life.

It is suitable for high concentration, high temperature, low temperature, etc. of any kind of acid, alkali, basic, aromatic, halogen, etc. as well as corrosion, and it can be used regardless of high concentration, high temperature, and low temperature of chemicals. The pipe construction is easy and the compatibility is very good.

In particular, the ultra-high molecular weight polyethylene lined pipe of the present invention is less corrosive as well as less wear and foreign matter when used as a transfer pipe for transporting sludge in a desulfurization facility of a power plant It can be used for a semi-permanent life, such as no problem.

Physical properties of the double pipe (that is, ultra-high density polyethylene lined pipe) in which the ultra-high density polyethylene liner 3 is coupled to the inside of the carbon steel pipe 1 of the present invention as described above are shown in Table 1 below. .

Item unit shame importance G / ㎠ 0.94 The tensile strength Mpa (kgf / ㎠) 31 (320) Elongation % 500 Compressive strength: yield point 5% strain (10% strain) Mpa (4.6kgf / ㎠) 20 (200) Flexural strength Mpa (kgf / ㎠) 20 (200) Flexural modulus Mpa (kgf / ㎠) 883 (9) Rockwell Hardness R-Scale 52 Heat Deflection Temperature: 0.445Mpa (4.6kgf / ㎠)

1,820 Mpa (18.6kgf / ㎠)
℃

℃
89

54 Continuous use temperature ℃ -100 to +80 Coefficient of linear expansion X / ℃ 20

The present invention as described above is a double tube composed of an ultra-high molecular weight polyethylene liner (3) bonded to the inside of the carbon steel pipe (1) made of carbon steel has a continuous use temperature of -100 ℃ 80 It can be used up to ℃, and it is composed of double pipe by combining carbon steel pipe (1) and ultra-high molecular weight polyethylene liner (3), so Rockwell hardness (R-Scale) is 52 As wear resistance is very high.

In addition, as shown in Table 1 above, the tensile strength [Mpa (kgf / ㎠)] is 31 (320), flexural strength [Mpa (kgf / ㎠)] is 20 (200), flexural modulus [Mpa (kgf / ㎠) )] Is 883 (9), the compressive strength is 20Mpa (4.6kgf / ㎠) when yield point is 5% strain, 200Mpa (4.6kgf / ㎠) when 10% strain is, elongation is 500%, and heat deflection temperature Is 89 ° C. at 0.445 Mpa (4.6 kgf / cm 2) and 54 ° C. at 1,820 Mpa (18.6 kgf / cm 2), and the coefficient of linear expansion (X / ° C.) is 20 and the dielectric constant [誘電率; It has excellent permittivity, heating deviation temperature, flexural strength, yield strength, etc., good electrical insulation and UV resistance, and excellent physical shock.

Next, the "Ultra-high molecular weight polyethylene lined pipe manufacturing method" will be described according to FIGS. 3 to 7 attached as a second embodiment of the present invention.

First, in the first process, as shown in FIG. 3, the metal tube 1 made of carbon steel is cut to a size and a desired size, and the cut portions are finely trimmed so that a plurality of binding holes are formed at both ends of the metal tube 1, respectively. After the formation of the (10), the flange (2) by electric arc welding so as to be perpendicular to the joint fixed.

The binding hole 10 is molded by the molten resin is pushed during the flaring and can safely cope with the contraction and expansion of the liner during transport in the winter.

That is, in FIG. 7, when the ultra-high molecular weight polyethylene liner 3 is contracted or expanded during transportation during the winter season, the liner of the flange 2 at both ends is opened or lifted off. To prevent.

In addition, the ultra-high molecular weight polyethylene liner (3) inserted into the metal tube (1) is manufactured in the standard and dimensions to be used in a conventional manufacturing method.

Subsequently, as a second process, the metal tube 1 manufactured as shown in FIG. 4 is attached to the front support plate (not shown) of the drawer, and the UHMWPE liner 3 thus manufactured is attached to the drawer bar to reduce the shaft diameter die 4. Pass through).

The shaft die 4 has an inlet 5 in the same shape as the fallopian tube and the outlet 6 has an inner diameter equal to the inner diameter of the metal tube 1.

In addition, the diameter of the UHMWPE liner 3 to the outer diameter is larger than the inner diameter of the metal tube 1 by 0.02 mm to 0.09 mm.

When the diameter of the UHMWPE liner 3 is less than 0.02 mm, the adhesion force is lowered when it is inserted into the metal tube 1 so that the separation from the external metal tube 1 occurs during use, and more than 0.09 mm. When large, when inserted into the metal tube 1, the UHMWPE liner 3 has a problem in that the properties of the physical property are greatly changed and thus the reduction is not performed.

As shown in FIG. 4, the UHMWPE liner 3 that has passed through the shaft die 4 is inserted into the metal tube 1 in a state in which it is reduced to the inner diameter of the shaft die 4.

The UHMWPE liner 3 reduced and inserted into the metal tube 1 is completely intimately adhered to the inner surface of the metal tube 1 by the reducing action of the reducing property of the physical property so as not to be separated.

Subsequently, in the third process, the UHMWPE liner 3 inserted by the method as shown in FIG. 4 is to be flared on the flange 2 surface at the end of the metal tube 1 as shown in FIG. 5. Cut the UHMWPE liner (3) leaving only the bay.

Subsequently, heat is applied at 150 ° C. to 170 ° C. for about 3 to 4 minutes through the inner diameter of the cut UHMWPE liner 3 to stabilize the physical deformation generated while passing through the shaft diameter die 4.

When the temperature for applying heat through the inner diameter of the UHMWPE liner 3 is 150 ° C. or less, the temperature is low, so that physical deformation of the UHMWPE liner 3 cannot be stabilized, and when the temperature is 170 ° C. or more, the UHMWPE liner 3 There is a problem that close to the melting point (180 ℃ ~ 200 ℃) of the structure and the structure is broken and deformation occurs in other forms.

If the heating time is also 3 minutes or less, the physical deformation of the UHMWPE liner 3 cannot be stabilized. If the heating time is 4 minutes or more, the UHMWPE liner 3 is damaged due to overheating. There is a problem that deformation occurs.

Therefore, as described above, the UHMWPE liner 3 stabilizes the physical deformation caused by passing heat through the shaft diameter die 4 by applying heat at about 150 ° C. to 170 ° C. for about 3 to 4 minutes through its inner diameter.

Subsequently, heat is uniformly applied to the portion 7 to be flared as the fourth process by indirect heat of 180 ° C to 200 ° C for about 5 minutes.

When the indirect heat applied to the portion to be flared 7 is 180 ° C. or less, the flaring does not occur well, and when 200 ° C. or more, there is a risk of melting.

Next, as a fifth process, the operator folds out the portion 7 to be flared out like a fallopian tube and then presses the flare at the pressure (80 to 100 kg / cm 2) of the hydraulic cylinder 9 to the flaring ring 8 as shown in FIG. 6. The ring is pressed to the outer surface of the flange 2 and bound.

Through the above process, the "Ultra-high molecular weight polyethylene Lined Pipe" of the present invention as shown in FIG. 7 is completed.

Physical properties of the "Ultra-high molecular weight polyethylene (Lined) Pipe" of the present invention prepared as described above are as shown in Table 1 above, and the effect is also as described above.

That is, by inserting the ultra-high molecular weight polyethylene liner (3) into the inside of the carbon steel metal tube (1) by combining the double tube to be excellent in chemical resistance, wear resistance and the best impact resistance and coefficient of friction Is close to zero, and foreign matter is not attached, so it is particularly suitable for use as a transfer pipe for transporting sludge in a desulfurization plant of a power plant.

In addition, it is cold-resistant and non-toxic, and it does not harm food, it has economical effect with semi-permanent lifespan, and it is suitable for any kind of acid, alkali and basic compound due to remarkable resistance to corrosion, and suddenly corrosion or physical shock occurs. Suitable for use in easy steelmaking, chemical plants, and nuclear power plant equipment, the internal ultra-high molecular weight polyethylene liner (3) maintains a constant pressure so that the ultra-high density The durability of the molecular weight polyethylene liner is semipermanent and does not click or break under sudden impact.

In transporting fluid material, sludge from power plant desulfurization facility, which mainly consists of sulfur oxides, the inner surface is smooth, so it has little frictional resistance and no deposits are formed, thus maintaining the flow rate of the pipe during initial construction. The flow rate is very large.

The metal tube 1 and the ultra-high molecular weight polyethylene liner 3 are combined so that the thermal expansion characteristics are the same as those of the metal tube and can be protected from freezing.

That is, since the metal tube 1 protects the exterior, it is very strong against freezing waves.

Ultra-high molecular weight polyethylene liner (3) has a very low thermal conductivity and excellent thermal insulation effect, conserving the energy of the transport fluid.

The combination of the metal tube (1) and ultra-high molecular weight polyethylene liner (3) provides precise adhesion between the inner diameter of the metal tube and the outer diameter of the UHMWPE liner, eliminating any gaps or gaps. And with excellent reliability, easy installation, high safety and semi-permanent durability will provide a high economic benefit to the user.

1: metal tube 2: flange
3: ultra-high molecular weight polyethylene liner
4: shaft diameter die 5: shaft diameter die inlet
6: Shaft die exit 7: Flaring part
8: Flaring Mold 9: Hydraulic Cylinder
10: binding hole

Claims

delete

After cutting the carbon steel pipe (1) made of carbon steel to the specification and dimensions to be used, trim the cut portions well to form a plurality of binding holes (10) at both ends of the metal pipe (1) and then flange (2) is manufactured by the specification and dimensions to be used as an ultra-high molecular weight polyethylene liner (3), which is fixed and bonded by electric arc welding so as to be vertical, and inserted into the metal tube (1). The first process to do,
A second process in which the ultra-high molecular weight polyethylene liner 3 is completely adhered to the inner surface of the metal tube 1;
Ultra-high molecular weight polyethylene liner (3) inserted into the metal tube (1) by the second process (Flaring) based on the flange surface (2) at both ends of the metal tube (1) The third step of cutting leaving only the part to be cut,
A fourth step of applying heat at a predetermined temperature to the portion to be flared of the ultra-high molecular weight polyethylene liner 3;
After the heat is applied to the part to be flared out like a fallopian tube, the flare is made by a flaring mold, and the flaring is carried out by the pressure of the hydraulic cylinder to be pressed to the outer surface of the flange to be bonded.
After attaching the metal tube to the drawing machine in the second process, the manufactured ultra-high molecular weight polyethylene liner 3 was manufactured so that its outer diameter was 0.02 mm to 0.09 mm larger than the inner diameter of the metal tube. To pass the fallopian tube shape through one shaft diameter die and insert it into the metal tube;
In the third process, a step of stabilizing physical deformation caused by passing through the shaft diameter die by applying heat for 3 to 4 minutes at 150 ℃ ~ 170 ℃ through the inner diameter of the ultra-high molecular weight polyethylene liner (3) and,
Ultra-high density polyethylene line by the process of constantly applying heat to the portion to be flared of the ultra-high molecular weight polyethylene liner (3) in the fourth process by indirect heat of 180 ° C to 200 ° C for 5 minutes. Ultra-high molecular weight polyethylene lined pipe is prepared,
The double pipe formed by combining the ultra-high density polyethylene liner 3 inside the carbon steel pipe 1 has a Rockwell hardness (R-Scale) of 52 and a tensile strength [Mpa (kgf / ㎠)]. 31 (320), flexural strength [Mpa (kgf / ㎠)] is 20 (200), flexural modulus [Mpa (kgf / ㎠)] is 883 (9), and compressive strength is 20Mpa (4.6 kgf / ㎠) and 200Mpa (4.6kgf / ㎠) at 10% deformation, elongation at 500%, 89 ℃ at 0.445Mpa (4.6kgf / ㎠) heat deflection temperature and 54 at 1,820Mpa (18.6kgf / ㎠). C, a linear expansion coefficient (X / ℃) of 20, specific gravity (G / ㎠) of 0.94 and a continuous use temperature is -100 ℃ ~ 80 ℃ characterized in that the ultra-high density polyethylene lined pipe production method.