A method of manufacturing a display protect pipelines from electrochemical action

 

(57) Abstract:

The invention relates to construction and is designed to protect pipelines from exposure to stray currents. The pipe is applied two coats of insulation from krematorien and polyurethane foam in the form of "shells", cover with aluminum foil, which is fixed by the bands with their grounding through 10-50 m Between the first inner layer and outer layer of polyurethane foam glued propolymer solution tape of aluminum foil in the shape of a spiral, covering the outside of all pipe insulation. The ends of the ribbon to display in the joints of the pipe along the entire length of the pipeline and electrically connect with the bandages. Recommendations on the choice of the thickness of the tape and its winding. The invention improves the reliability of the pipeline.

The invention relates to the fields of electrical engineering and energy, more specifically, to methods for producing a display protect pipelines from electrochemical action.

It can be used to create pipelines of different sections and purposes: heat, gas, water and other media.

A known method of manufacturing the protection of various metal structures and installations from electrochemical Vvedenie into the ground through the ground loops or special earthing devices [1].

The disadvantage of this method [1] , adopted us as analogue, is the need to create additional special designs of costly due to requirements of high conductivity materials with a significant increase in capital costs and occupied by the screen workspace.

Largely this disadvantage is eliminated in the prototype [2], where the considered composite heat insulation of pipelines with fixed on her tires with aluminum foil, then there is mechanical design, technology needed to build pipeline insulation, combines their basic technological functions hold the insulation layers - "shells" on the pipe with the functions of the display pipeline protection from electrochemical action.

The thickness of the foil covering insulation "shell" bandages "shells" that are located at the joints, elements and their compounds are calculated using the density of stray currents in places piping depending on local operating conditions of the pipeline. While the resulting foil shield kasemset through 10-50 m depending on the mentioned local operating conditions of the pipeline according to the degree of electrochemical in the IKI open pipelines has increased dramatically so-called vandalism: undressing, simply theft of aluminum foil with pipelines that violates the integrity of the conductive path screens and leads to a reduction of 1.5 to 2 times the service life of the pipelines due to electrochemical corrosion. The integrity of the screens may be compromised due to other, for example, natural or construction reasons.

The aim of the invention is to improve the reliability and protective properties of the screens pipelines from electrochemical action, especially when laying exposed, increasing resource (time guaranteed nominal operation) of the pipelines with the expansion of application fields, especially in areas with a strong influence of stray and induced electric fields, currents from a variety of other equipment.

This goal is achieved in the method of manufacturing a display protect pipelines from electrochemical exposure, in which two layers of insulation from krematorien and polyurethane foam in the form of "shells" are covered on the tube with aluminum foil to mount the tires with the ground last through 10-50 m depending on the electrochemical effects on the pipeline.

And in the process shotsdoes of polyurethane foam glued penopolyuretanum solution tape of aluminum foil having a thickness of equal to the thickness of the aluminum foil covering the outside of all pipe insulation, and a width equal to 2-3% of the diameter of the pipe in the form of a spiral with a pitch equal to 2-3 times the diameter of the pipe, and its ends are connected with the joints along the entire length of the pipeline and electrically connect with the bandages.

The range of 2-3% of the diameter of the pipe: the lower limit applies to the large diameter pipe and the upper pipe of small diameter.

The range of pitch of the helix 2-3 pipe diameter: the lower limit applies to pipes of small diameter, and the upper to large diameter pipes.

A significant contrast to the known methods of manufacturing a display protect pipelines from the electrochemical action is that none of the known methods do not achieve a high reliability of electrical connection along the entire length of shielded pipeline, subject to possible vandalism (stealing foil), or others, for example, natural causes of damage, maintaining display of the electrical properties due to internal conductive and grounded through the bandages tape between krematorien and polyurethane foam insulation layer and, thus, unavailable for damage. Forming a inside cnom layer of penopoliuretana, retains its strength and electrical properties due to intermediate indicators expansion coefficients between the first layer of krematorien and a second layer of polyurethane foam, and also at the expense of the spiral gluing, that is adaptive to variations of thermal loads of the pipeline and the effect of thermal environmental indicators (winter - summer).

An example implementation of the method.

Manufacturer of screen protection of pipelines from the electrochemical action of the claimed method is as follows.

The traditional pipe operation is applied first layer: krematorien isolation - "shell". The resulting workpiece is a pipe length of 12 m and a diameter of 0.6 m krematorien insulation rotate and through the mechanism of the reciprocating motion is moved relative to the actuator causing the four intermediate polymer layers with a total thickness of 45%= 20% of the thickness of the first krematorien isolation "shell". With each pass reducing the concentration of the concrete mixture constituents from layer to layer by 20%. After applying the second intermediate layer from penopoliuretana wound on him the tape from aluminium again put two of the intermediate layer from penopoliuretana, the second outer layer of polyurethane foam. Traditional surgery mount aluminum outer covering (foil) using grounded through 10-50 m bands, which in the place of joints electrically connected (cook, solder, boltt) the ends of the aluminum ribbon, sealed with penopoliuretana between two layers of insulation - "shells".

The feasibility of patentable way there is no doubt, as all operations with additional tape is laid between the "shells" with a liquid mass penopoliuretana, creating a reciprocating linear movement of the pipe, connecting the ends of the tape to the bands in the joints of pipes welding or bolted method is technically quite worked out.

The use of patent-pending method of manufacturing a display protect pipelines from electrochemical action increases the resistance (normal guaranteed technical conditions) pipelines 1.4 times by expanding the range of applicability of the customer's 1.8 times.

Sources of information

1. The electrical engineering Handbook. So 3. Under the General Ed. P., Gruzinskogo and other Ed. 5-e, Corr. - M.: Energy. 1975, c.483.

2. Gasparyants R. S., Ignatov Dunarodnom Congress "CITOGIC-2001", Salekhard. Academy of technological Sciences. - M-Salekhard. 2001. 10 C.

A method of manufacturing a display protect pipelines from electrochemical action, in which two layers of insulation from krematorien and polyurethane foam in the form of "shells" are mounted on the tube with aluminum foil to mount the tires with the ground last through 10-50 m depending on the magnitude of stray and induced electric fields, currents, characterized in that in the manufacturing process of the composite heat-resistant insulation pipe with the first krematorien isolation "shell" rotate and through the mechanism of the reciprocating motion is moved relative to the actuator causing the four intermediate polymer layers with a total thickness of 4x5%= 20% the thickness of the first krematorien isolation "shell", reducing with each pass of the concentration of the concrete mixture constituents from layer to layer by 20%, after applying the second intermediate layer from penopoliuretana wound on him the tape of aluminum foil having a thickness equal to the thickness of the aluminum foil covering the outside of all pipe insulation, and a width equal to 2-3% of pipe diameter, in the form of a spiral with a pitch equal to two or three dinitroethane, bring the ends of the aluminum tape at joints and electrically connect them to the bands that hold the outer coating of the pipeline of aluminum foil.

 

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EFFECT: enhanced reliability.

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EFFECT: enhanced reliability of corrosion protection; considerable reduction of energy expenses; increased service life of metal coat.

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