SU1453145A1 - Method of checking the quality of joint of shell with carrier pipe in double-layer pipe - Google Patents

Abstract

The invention relates to energy and can be used in the manufacture of heat exchangers. The purpose of the invention is to improve the accuracy of quality control of the connection between the casing and the support pipe in a two-layer pipe. Controlled 2 and reference 3 pipes are installed in a casing close to each other and washed them outside

Description

The invention relates to energy and can be used in the manufacture of heat exchangers.

The purpose of the invention is to improve the accuracy of quality control of the connection between the casing and the support pipe in a double pipe.

FIG. 1 shows an installation for implementing the proposed method; in fig. 2 is a view A-A in FIG. one.

The installation contains a casing 1 with placed inside-controlled 2 and reference 3 double-layer pipes, inlet 4 and outlet 5 pipes of the cooling heat carrier passed through the internal cavity of pipes 2 and 3, and inlets 6 and outlet. 7 heating coolant washing the outer surface of pipes 2 and 3. Sensors 8 and 9 serve to measure the temperature of the cooling coolant S and sensor 10 to measure the temperature of the heating coolant. A flow meter is installed in the cooling coolant main

The method of controlling the quality of the connection between the shell and the support pipe in a two-layer pipe is as follows:

Controlled 2 and reference 3

The pipes are installed in the casing 1 close to each other and they are washed with a warm heating medium with constant parameters. Simultaneously, through the inlet 4 into the internal cavity of the pipes 2 and 3 serves coolant coolant, which is heated in the pipes 2 and 3 and removed from them through the inlet pipe 5. After reaching the stationary thermal state determined by the readings of the sensors 8 10 and also equal to

By the cost and constant costs of the cooling coolant through controlled 2 and reference 3 pipes, the values of temperature differences of the cooling coolant in controlled 2 and reference 3 pipes are measured and compared with each other. The quality of contact between the casing and the carrier pipe in the controlled pipe 2 is determined by the ratio of temperature differences in the controlled and reference 3 pipes. A liquid, for example, water, is used as the cooling coolant.

Heating the shell of a two-layer pipe 2 and cooling the carrier pipe leads to a large thermal expansion of the shell compared to the carrier pipe and, accordingly, to an increase in the contact thermal resistance, which improves the control accuracy. The use of liquid as a cooling medium reduces the error in measuring its temperature and flow rate, which also helps to increase the accuracy of control.

Claims (2)

3Q claims one . The method of controlling the quality of the connection between the shell and the carrier pipe in a double-layer pipe is by simultaneously heating and cooling the controlled pipe with 1m isothermal and cooling heat transfer fluids, one of which is passed through the internal cavity of the pipe, and the other is washed around its surface, followed by a steady thermal state no measurement of the temperature difference at the inlet and outlet of the cooling coolant and comparison 35 40 1453145. 4 the results obtained with coor.ercr.y- k, n, i the coolant passes through The reference value of the reference pipe, which is characterized by the fact that, in order to increase the control accuracy, it is used to heat the external surface of the pipe with a heating coolant and to cool the internal cavity. 2. The method according to p. 1, about tl and h and y and with the fact that as a cooling tegshonositel use liquid. k, p, i coolant passes through its internal cavity. 2. The method according to p. 1, about tl and h and y and with the fact that as a cooling tegshonositel use liquid. eight / 1