RU142276U1 - TRANSITION WITH BRANCHES PROTECTED FROM CORROSION BY INTERNAL COATING AND UNDERBOARD BIMETAL BUSHES - Google Patents

Abstract

Using. The manufacture of transitions with internal coating, which can be used in the construction of pipelines in various industries for the transportation of aggressive environments, for example, in the oil, gas, chemical, oil refining industries and housing and communal services. The technical result. Improving the reliability of corrosion protection of welded joints of branch pipes with a transition, as well as their welded joints with a pipeline during operation. SUMMARY OF THE INVENTION In the transition with pipes, corrosion-protected inner coating and bimetallic liners, including transition, welds, pipes and inner coating, where the new is that the transition and their welded joints with pipes are covered with bimetallic bushings and the inner ends of the liners are bimetallic and the transition with the pipes glued together with a sealant. 2 s.p. f-ly and 1 ill.

Description

The utility model relates to the field of manufacturing transitions with internal coating, which can be used in the construction of pipelines in various industries for the transportation of aggressive media, for example, in the oil, gas, chemical, oil refining industries and housing and communal services.

A useful model is known: a combined pipeline transition, comprising a shaped profile with radial mates of various diameters and wall thicknesses, or a tapered transition, characterized in that the ends of the pipeline transition are rigidly connected to the nozzles at the ends of which ring bevels are made for subsequent welded connection to the pipeline, a protective coating is applied on the inner surface of the nozzles and on the outer surface of the transition of the pipeline, providing a temperature change from -60 to 1 50 ° C, and the end regions of the nozzles on their outer surface are free of protective coating, in accordance with the coverage area of the weld joint. (RF patent for utility model No. 61386, IPC F16L 13/02 “Combined Pipeline Transition”, by application No. 2006104128/22, 02.10.2006, published on 02.27.2007).

This utility model has the following disadvantages. Very low reliability of the protection against corrosion damage of welds of nozzles with a tee. That is, in the transition with welded nozzles, protected from internal corrosion, the bottleneck is the welds of the nozzles with the transition. Stripping welds is a very time-consuming process and requires special equipment to remove the internal burr forming during electric arc welding. At the same time, the uniformity of applying the inner coating in the transition is not ensured due to the remaining sharp edges in the welds, which is the reason for the welds of the nozzles to exit with the transition during operation of the pipeline. In addition, the transition itself with welded nozzles is designed to connect to the pipeline using liners, protected by corrosion. They are very complex and time-consuming to manufacture and very inconvenient to install. The above design of welded joints with liners, protected from corrosion by a polymer coating showed very low reliability during the operation of oil field pipelines. There is a large gap between the inner surface of the nozzles and the outer surface of the liners, in order to protect the polymer coating from destruction by the heat of the electric arc welding process. This leads to a decrease by a large amount of the cross section of the pipeline, and especially in pipelines of small diameters. The decrease in the cross section of the pipeline in the places where the liner sleeves are installed on pipelines with a diameter of 89 mm is more than 45%. In addition, liners are attached to the weld of the pipeline by welding corner transitions, which does not ensure their reliability of fastening, which leads them to disrupt the flow of the transported medium.

The technical task of the utility model is to increase the reliability of corrosion protection of welded joints of pipes with transitions, as well as their welded joints with pipes of the linear part of the pipeline during operation.

The problem is achieved in that in the transition with nozzles protected from corrosion by the inner coating and the bimetallic liners, including the transition, welds, nozzles and the inner coating, where the new is that the tee and their welded joints with the nozzles are covered by bimetallic liners, and the inner ends of the bimetallic liners and the transition with the nozzles are glued together with a sealant. In the transition, the bimetallic bushings protrude beyond the ends of the transition pipes and rubber cuffs are installed on their outer surface. In the transition, the bimetallic bushings have annular protrusions on the outer surface, which abut against the ends of the transition pipes.

This design of the transition with pipes protected from corrosion by the inner coating and liners bimetallic helps to increase the reliability of corrosion protection of welded joints of pipes with a tee, as well as their welded joints with pipes of the linear part of the pipeline during operation. Overlap of the transition and their welded joints with bimetallic bushings and gluing with the help of sealant the inner ends of the bimetallic bushings and the transition with nozzles allows to seal the welds with the internal coating of the transition with nozzles. This is an additional protection for welds from internal corrosion. In the transition, the bimetallic liners protrude beyond the ends of the transition nozzles a and cuffs of rubber are installed on their outer surface, which serve to protect the welded joint of the transition with the welded nozzles from the pipeline from corrosion. In the transition, the bimetallic bushings have annular protrusions on the outer surface, which abut against the ends of the transition pipes and serve to fix the bimetallic bushings to the welds of the pipeline.

The utility model is illustrated in the drawing. The figure shows the transition with nozzles protected from corrosion by the inner coating and bi-metal liners, consisting of transition 1, nozzles 2, welds 3, inner coating 4, sealant 5, bushings 6 made of carbon steel, shells 7 made of stainless steel and cuffs 8 made of rubber.

Assembly is carried out in the following sequence. An arc is welded to the transition 1 of the nozzle 2 with the formation of welds 3. Remove the inner fillet in the welds 3, clean the inner surface of the transition 1 with the welded nozzles 2 using a shot blasting machine and apply the inner coating 4 to the surface of the transition 1, welds 3 and parts branch pipes 2. Branch pipes 2 are left unprotected over the propagation heat of the weld, at which destruction of the material of the inner coating may occur 4. Apply sealant 5 to the welds 3 and to the weld zones near the weld 1 transition of the connections with pipe 2. Install sleeve skid bimetal, consisting of carbon steel sleeves 6, which are internally clad shells 7 of stainless steel. The ends of the carbon steel bushings 6 move the sealant 5. The protruding ends of the corrosion-resistant steel shells 7 behind the carbon steel bushings 6 form spaces with a transition 1 with welded nozzles 2 that fills the sealant 5. The ends of the corrosion-resistant steel shell 7 overlap the welds 3, and the sealant 5 glues the inner ends of the shells 7 with the surface of the ends of the transitions 1, welds 3 and part of the nozzles 2, which allows for reliable sealing and to prevent the transported medium between bechaykami 7 made of stainless steel and the transition 1 2 nozzles.

During installation, the transition with nozzles protected from corrosion by the inner coating and bimetallic liners is connected to the pipes of the linear part of the pipeline by electric arc welding using the well-known technology for joining two-layer steels.

When using such a transition design with welded nozzles, an inner coating protected from corrosion, and bimetallic liners, the reliability of corrosion protection of welded joints of the nozzles with the transition, as well as their welded joints with pipes of the linear part of the pipeline during operation, is increased.

Used literature: RF patent for utility model No. 61386, IPC F16L 13/02 “Combined Pipeline Transition”, by application No. 2006104128/22, 02/10/2006, published on 02/27/2007.

Claims (3)

1. The transition with nozzles, protected from corrosion by the inner coating and the bimetallic liners, including the transition, welds, nozzles and inner coating, characterized in that the transition and their welded joints with the nozzles are covered by bimetallic bushings, and the inner ends of the bimetallic bushings and transitions with nozzles glued together with sealant. 2. The transition according to claim 1, characterized in that the bimetallic bushings protrude beyond the ends of the transition pipes and rubber cuffs are installed on their outer surface. 3. The transition according to any one of claims 1 and 2, characterized in that the bimetallic bushings have annular protrusions on the outer surface, which abut against the ends of the transition pipes.

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