SU1148750A1 - Method of thermal assembly of two-layer cylindrical shells - Google Patents

Abstract

A METHOD FOR THERMAL ASSEMBLY OF DOUBLE-LAYER CYLINDRICAL SHUTTERS, including heating the outer cylinder, installing the vertical cylinder in the inner cylinder and then cooling the assembly as a whole, characterized in that it is designed to expand technological capabilities by. ensure the manufacture of fine. before heating the outer cylinder, calibration rings made of a material with a temperature expansion coefficient smaller than that of the outer cylinder are installed on the outer surface of the outer cylinder, before installing it in the outer cylinder, fixing the calibrating disk, and after cooling the assembled The gage ring assembly and the Kalybrukdiy disk are removed.

Description

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The invention relates to mechanical engineering, in particular, to the technology of manufacturing vessels operating at high pressures and temperatures, and may find application in the chemical, petrochemical, energy, and other industries.

The aim of the invention is to expand the technological capabilities by providing for the manufacture of thin-walled large-sized shells, since the calibration of the outer cylinder during heating and the installation of a sizing disc in the inner cylinder ensures their coupling even with minimal gaps between the heated outer and cold inner cylinders, and the transfer of the center of gravity the inner cylinder to the lower end reduces the harmful consequences of the skew of the longitudinal axis of the inner cylinder relative to the prod Flax axis of the outer cylinder.

The drawing shows the circuit Assembly of a two-layer cylindrical shell.

Example. The manufacture of a two-layer cylindrical shell with an outer diameter of 3672 mm, a height of 2000 mm from two cylinders: an outer cylinder of steel grade 12XJ8H10T with an inner diameter of 3640 mm and a wall thickness of 16 mm, an inner cylinder of steel grade

0912s with an outer diameter of 3650 mm and a wall thickness of 20 mm.

On the outer cylinder 1 on the strips 2 in a cold state, set the gage rings 3 with a clearance of a. Rings are made of steel grade VStZkpp2, in which the coefficient of linear expansion is less than that of steel grade 12X18H10T. With a diameter of 3640 mm settlement clearance ct 8 mm. The cylinder assembled with calibrating rings is installed in vertical positions on the draw-out hearth of the furnace and heated to a temperature of 500 ° C. At the same time the cylinder 1 is automatically calibrated on the rings 3 due to the difference in temperature expansion of the material of the cylinder and the rings. The geometry of the outer cylinder is checked with a reference gauge.

In the inner cylinder 4, in its lower part, a massive calibrating disk 5 weighing 10 tons is fixed and, together with the disk, the inner cylinder is lowered into the heated cylinder by means of an overhead crane.

After cooling, strips 2, calibrating rings 3 and calibrating disk 5 are removed from the cylinders.

The result is a two-layer cylindrical shell with a gapless connection of cylinders.

The proposed method, in comparison with the known, allows the manufacture of thin-walled two-layer large-sized shells.

Claims (1)

ASSEMBLY METHOD OF HEAT TWO-PLY cylindrical shells comprising heating the outer cylinder, setting it upright inner cylinder and the subsequent cooling of the product assembly, characterized in that, to expand the technological possibilities of logical ¹ by providing a manufacturing finely, the mantle wall oversized , before heating the outer cylinder, calibration rings of material are installed on its outer surface with a coefficient of thermal expansion smaller than that of the material externally a cylinder, the bottom of the inner cylinder before inserting it into the outer cylinder is fixed sizing disc and collected after cooling assembly calibrating ring and ^ sizing disc removed. W · H> Sil ·.,. 1148750