SU526422A1 - The method of connecting pipes with a tube plate - Google Patents

Description

one

The invention relates to a method for obtaining permanent joints of a pipe with pipe plates using flaring and welding mainly during repair work in installation conditions, especially when there is an aggressive environment in the repair area, as well as when the operator’s time at the work site is limited. The invention can find wide application in the chemical and energy industries.

There is a known method of connecting a pipe to a tube plate, in which the tube is expanded and welded to the tube plate from the inside.

The purpose of the invention is to simplify the process of restoring the operability of the compound during repair, as well as reducing the repair time.

This is achieved by expanding the pipe to a running fit throughout the joint area with the tube plate, the diameter of the pipe protruding from the tube plate is made larger than the diameter of the hole in the tube plate, and welding is carried out in the middle part of the joint with three annular passages without through melting of the pipe wall.

FIG. 1 shows the pipe at the time of flaring in the tube plate opening throughout

the joint zone and the pipe sections adjacent to the ends of the tube plate; in fig. 2 - ready-made compound obtained by the proposed method, where L is the zone of flaring; / is the length of the joint zone; b - pipe thickness; D - the gap in the connection in the middle part; D is the diameter of the hole in the tube plate; d - outer diameter of the pipe in the adjacent areas to the tube plate

d -D

but -

The method of producing pipe 1 with tube plate 2 is carried out by rolling 3, followed by applying an annular weld 4.

Rolling 3 is introduced into the pipe 1 and the pipe begins to be flared throughout the joint area, maintaining the gap between the wall of the pipe 1 and the pipe plate 2 in its middle part corresponding to the running fit, and up to the diameter d of the pipe 1 on both sides of the pipe board 2 exceeding the diameter D holes in it are not less than / 2 wall thickness b of pipe I. Then, welding is carried out in the middle

/

from the butt

coupling parts at a distance of

30 tube plates 2, at least three annular passages without penetration.

As a result of the flaring, the two-sided mounting of the pipe 1 in the tube plate 2 and the subsequent welding annular passages create an additional tightening of the joint. The initial gap in the middle part of the joint, obtained after flaring, prevents intensive heat removal from the weld zone to the tube plate 2, thereby contributing to a better shrinkage of the tube 1.

During the operation of the joint, in case of need to restore the operability of the joint, it is possible to impose additional annular welding passages on the pipe in the middle part of the joint.

Claims (1)

Invention Formula The method of connecting the pipe to the tube plate, in which the tube is expanded and welded to the tube plate from the inside, characterized in that, in order to simplify the process of repairing the joint during repair and shorten the repair time, the tube is flared the landing across the entire joint zone with the tube plate, the diameter of the tube in the region protruding from the tube plate is made larger than the diameter of the hole in the tube plate, and welding is performed in the middle part connections by three annular passages without penetration through the pipe wall. cL d.