RU137079U1 - WELDED TEE TEE PROTECTED FROM INTERNAL CORROSION WITH CORROSION-RESISTANT STEEL COATING AND SHOES - Google Patents

Abstract

1. A tee with welded nozzles, protected from internal corrosion by a coating and shells made of corrosion-resistant steel, including a tee with welded nozzles and an inner coating, characterized in that the pipes and their welds with a tee are plated inside with shells made of corrosion-resistant steel. 2 . A tee according to claim 1, characterized in that there is a sealant between the inner ends of the shells and the tee. A tee according to claim 1, characterized in that a seal of elastic elastic material is placed between the inner ends of the shells and the tee. A tee according to claims 1 to 3, characterized in that a seal of elastic elastic material and a sealant are placed between the inner ends of the shells and the tee.

Description

The utility model relates to the manufacture of internally coated tees that can be used in the construction of pipelines in various industries for transporting aggressive media, for example, in the oil, gas, chemical, oil refining and housing and communal services.

A useful model is known: a combined pipe tee, where adapters are welded to the ends from the side of 3 end protrusions, the welds are cleaned from the inside, and a protective coating is applied along the outer contour, the boundary zones of which are limited by the parameters of the welded joint, the inner surfaces of the nozzles are prepared for hard compounds with protective shells, the internal profile of the combined pipe tee is cleaned and provided with a corrosion-resistant coating. (RF patent for utility model No. 55920, IPC F16L 3/02 “Combined pipeline tee”, by application No. 2006104152/22, 02.10.2006, published on 08.27.2006).

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 a tee with welded nozzles, protected from internal corrosion, the bottleneck is the welds of the nozzles with a tee. 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 tee is not ensured due to the remaining sharp edges in the welds, which is the reason for the welded joints of the nozzles with the tee to exit during operation of the pipeline. In addition, the tee itself with welded nozzles is designed for connection using liners, which are very complex and laborious to manufacture and very inconvenient to install. The above design of welded joints during the operation of oil field pipelines showed very low reliability. The pipeline cross section decreases by a large amount, and especially on pipelines with a diameter of 89 mm or less. The decrease in the cross section of the pipeline in the places where the bushings are installed is almost 50%.

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

The problem is achieved in that in a tee with welded nozzles, a coating protected from internal corrosion and shells made of corrosion-resistant steel, including a tee with welded nozzles and an inner coating, where the new is that the nozzles and their welds with a tee are internally clad with shells made of corrosion-resistant become. A sealant is located in the tee between the inner ends of the shells and the inner surface of the tee. In the tee between the inner ends of the shells and the tee is placed a seal of elastic elastic material. In the tee between the inner ends of the shells and the tee is placed a seal of elastic elastic material and sealant.

Such a design of a tee with welded nozzles, a coating protected from internal corrosion and shells made of corrosion-resistant steel makes it possible to increase the reliability of corrosion protection of welded joints of nozzles with a tee, as well as their welded joints with pipes of the linear part of the pipeline during operation. Cladding from the inside of the pipes and their welds with a tee of corrosion-resistant steel shells allows you to further protect the welds from internal corrosion. Welded seams protected from corrosion by an internal coating are covered by shells made of corrosion-resistant steel, and a sealant or seal located between the inner ends of the shells and the inner surface of the tee allows reliable sealing to prevent the transported medium from entering between the shells and the tee. The ends of the shells of stainless steel and pipes have a single chamfer for their connection by electric arc welding.

The utility model is illustrated in the drawing. The figure shows a tee with welded nozzles, protected from internal corrosion by a coating and shells of stainless steel, consisting of a tee 1, nozzles 2, welds 3, inner coating 4, seals 5 and shells 6 of stainless steel.

Assembling a tee with welded nozzles, protected from internal corrosion by coating and shells made of stainless steel is carried out in the following sequence. An electric arc welding to the tee 1 welds the nozzles 2 with the formation of welds 3. Remove the inner fillet in the welds 3, clean the inner surface of the tee 1 with the welded nozzles 2 using a shot blasting machine and apply the inner coating 4 to the surface of the tee 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 inner coating may occur 4. Apply sealant 5 and install a shell 6 of corrosion-resistant steel distribution in the radial direction, in which the gap between the shells 6 and the tee 1 with welded nozzles 2 is completely selected. The shells 6 overlap the welds 3, and the sealant 5 glues the inner ends of the shells 6 with the surface of the ends of the tee 1, welds 3 and parts of the nozzles 2, which allows to obtain reliable sealing and to prevent the ingress of the transported medium between the shells 6 and the tee 1.

During installation, a tee with welded nozzles, protected from internal corrosion by a coating and shells made of corrosion-resistant steel, is connected to the pipes of the linear part of the pipeline by electric arc welding using the well-known technology for connecting two-layer steels.

When using such a design of a tee with welded nozzles, protected from internal corrosion by a coating and shells made of corrosion-resistant steel, the reliability of corrosion protection of welded joints of nozzles with a tee, as well as their welded joints with pipes of the linear part of the pipeline during operation, is increased.

References:

RF patent for utility model No. 55920, IPC F16L 3/02 “Combined pipeline tee”, by application No. 2006104152/22, 02/10/2006, published on 08/27/2006.

Claims (4)

1. A tee with welded nozzles, protected from internal corrosion by a coating and shells made of corrosion-resistant steel, including a tee with welded nozzles and an inner coating, characterized in that the nozzles and their welds with a tee are plated inside with shells made of corrosion-resistant steel. 2. The tee according to claim 1, characterized in that between the inner ends of the shells and the tee is a sealant. 3. The tee according to claim 1, characterized in that between the inner ends of the shells and the tee is placed a seal of elastic elastic material. 4. A tee according to claims 1 to 3, characterized in that between the inner ends of the shells and the tee there is a seal made of elastic material and sealant.

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