RU135071U1 - BEND WITH BRANCHES AND INTERNAL COATING - Google Patents

Abstract

1. An outlet with nozzles and an inner coating, including an outlet, nozzles, welds and an inner coating, characterized in that the inner surface of the ends of the outlet, welded joints of the outlet with nozzles and parts of the uncoated nozzles are clad with stainless steel shells. 2. The outlet according to claim 1, characterized in that the inner ends of the shells of corrosion-resistant steel are glued to the inner coating of the outlet with nozzles using sealant.

Description

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

A useful model is known: A pipe branch with a radius section having ends, containing nozzles, annular chamfers located at the ends of the branch, and annular bevels of the nozzles made with the possibility of forming surfaces connected by annular welds that are provided with a protective coating, the nozzles with annular bevels are made without coating the welds relative to the ends, the contact zones of the nozzles are connected to the protective shells, the annular chamfers of the nozzles are made with the possibility of the formation of a weld relative There are only ends with pipelines similar when connecting the inside and outside diameters of the pipes to fit the thickness, and the inside surfaces of the pipe branch are provided with an anti-corrosion coating on the inside with an operating temperature range of +150 to -60 ° C. (Patent for utility model of the Russian Federation No. 60171, IPC F16L 3/02 and B23K 31/00, according to the application No. 2006104148/22 dated 02.10.2006, published 01.10.2007).

This utility model has the following disadvantages. Very low reliability of protection against corrosion damage of welded joints of branch pipes. That is, in the branch with welded nozzles, protected from internal corrosion, the bottleneck is the welds of the branch pipes with the branch. 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 the internal coating in the branch is not ensured due to the remaining sharp edges in the welds, which is the reason for the welded joints of the branch pipes with the branch during the operation of the pipeline. In addition, the tap with welded nozzles is intended for connection with the help of liners, protected from corrosion by a polymer coating, which are very complex and laborious to manufacture and very inconvenient and difficult to install. The above design of welded joints during the operation of oil field pipelines showed very low reliability. The cross section of the pipeline is reduced by a large amount, and especially on pipelines with a diameter of 89 mm or less, since a large gap must be left between the ends of the pipes and the liner, in order to ensure the safety of the coating from the effects of welding heat. The decrease in the cross section of the pipeline in the places where the bushings with polymer coating are installed reaches almost 50%. On large-diameter pipelines and on high-pressure high-pressure water conduits of the reservoir pressure maintenance system, they are simply disrupted by the flow of transported oil or field wastewater.

The technical task of the utility model is to increase the reliability of corrosion protection of welded joints of branch pipes with a branch, 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 branch with nozzles and internal coating, including the outlet, nozzles, welds and the inner coating, where new is the fact that the inner surface of the ends of the outlet, welds of the outlet with the nozzles and parts of the uncoated nozzles are clad with corrosion-resistant shells become. In the branch, the inner ends of the shells of stainless steel are glued to the inner coating of the branch with nozzles using sealant.

This design of the branch with the nozzles and the inner coating allows to increase the reliability of corrosion protection of welded joints of the branch pipes with the branch, as well as their welded joints with pipes of the linear part of the pipeline during operation. Cladding from the inside of the inner surface of the ends of the branch, welds of the branch with branch pipes and parts of the branch pipes without coating with shells made of corrosion-resistant steel pipes and their welds with branch pipes of corrosion-resistant steel can further protect welds from internal corrosion. Welded seams protected from corrosion by an internal coating are covered by shells made of corrosion-resistant steel, and gluing the inner ends of shells made of corrosion-resistant steel to the inner cover of the branch pipe with seals allows for reliable sealing to prevent the transported medium from entering the welded joints of the branch pipe.

The utility model is illustrated in the drawing. The figure shows an outlet with nozzles and an inner coating, consisting of outlet 1, nozzles 2, welds 3, inner coating 4, sealant 5 and shells 6 made of corrosion-resistant steel.

Assembly of the outlet with nozzles and internal coating is carried out in the following sequence. Arc welding is welded to branch 1 of branch pipe 2 with the formation of welds 3. Remove the inner fillet in welds 3, clean the inner surface of branch 1 with welded branch pipes 2 using a shot blasting machine and apply inner coating 4 to the surface of branch 1, welds 3 and parts branch pipes 2. Branch pipes 2 are left unprotected over the heat propagation length of the weld, at which destruction of the material of the inner coating may occur 4. Apply sealant 5 to the inner coating 4 and install a shell 6 of core ozion-resistant steel by distributing in the radial direction, in which the gap is completely selected by the inner surface of the ends of branch 1, welds 2 of branch 1 with nozzles 3 and part of branch pipes 2 without coating 4. Moreover, shells 6 made of corrosion-resistant steel are glued to the inner surface of ends of branch 1 , welds 2 of branch 1 with nozzles 3 and parts of nozzles 2 without coating 4 using sealant 5, which allows reliable sealing and to prevent the transported medium from entering welded joints of branch 1 with nozzles 2.

During installation, the outlet with nozzles and inner coating is connected to the pipes of the linear part of the pipeline by electric arc welding, where a bimetallic liner is installed between the ends of the outlet with the nozzles, where the protruding ends of their shells made of corrosion-resistant steel are glued using mastic or sealant to the shells made of corrosion-resistant steel of the branch with nozzles. An annular protrusion on the outer surface of the bimetal underlay sleeve is welded to the weld seam of the branch pipes and pipes of the linear part of the pipeline.

Using this design of the branch with nozzles and internal coating, the reliability of corrosion protection of welded joints of the branch pipes with the branch, as well as their welded joints with pipes of the linear part of the pipeline during operation, is increased.

References:

Utility Model Patent: “Combined Pipe Retraction” of the Russian Federation No. 60171, IPC F16L 3/02 and B23K 31/00, by application No. 2006104148/22 dated 02.10.2006, published 01.10.2007

Claims (2)

1. An outlet with nozzles and an inner coating, including an outlet, nozzles, welds and an inner coating, characterized in that the inner surface of the ends of the outlet, welded joints of the outlet with nozzles and parts of the uncoated nozzles are clad with stainless steel shells. 2. The tap according to claim 1, characterized in that the inner ends of the shells of stainless steel are glued to the inner coating of the tap with nozzles using sealant.

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