JPS60164605A - Plant piping monitoring device - Google Patents

Abstract

PURPOSE:To make automatic monitoring and diagnosis of pipe support devices possible by providing the system which compares the data in a memory of signals from a sensor for detecting the travel amount of a pipe support system and the data in a standard data memory. CONSTITUTION:A previous setting is made according to if the object piping is a main steam piping, a high temperature reheat steam piping, or an auxiliary piping and the position of a travel pointer of a hanger 31 is begun to be inputted. If the inputted position of the pointer is not within an allowable range, the hanger 31 is in a danger of no load or rigidified state, so that the information on the hanger 31 in an abnormality is outputted to a display 41 and a printer 42. Since the results of a functional diagnosis for the individual hangers in a system are memorized by the above operation, a secular change of the system is diagnosed based on these data and the pointer position of each hanger is analyzed in relation to the cumulative time of operation and compared with a pattern diagram showing the change of the pointer position with the increase of the cumulative service time of the plant previously inputted and when any abnormality is found an output on abnormal pattern is produced to prevent causing troubles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for monitoring a pipe support device and diagnosing the state of the pipe support.

The piping rows of the main piping for conventional thermal power plants are: 1st is a rigid hanger, RR is a restraint, AN is an anchor, GI is a guide, VE is a vibration isolator, ] is a superheater outlet pipe, 2 is a pressure reducing valve, and 3 is a Auxiliary steam pipes are shown respectively.

As shown in FIG. 1, pipes are supported by pipe support devices (hangers, supports) having various different functions. The outline of these tube support devices is illustrated in FIGS. 2 to 8.

Figure 2 shows the constant hanger CH, in which reference numeral 4 is a spring, 5 is a radial support, and 6 is a spring.
is a hangar rod, 7 is a mounting base, 8 is a load adjustment bolt, 9
1 indicates a load adjustment handle, 10 indicates a set bin, and 11 indicates a travel pointer.

Figure 3 shows a spring hanger SH, in which reference numeral 12 is a spring, 13 is a holding plate, 14 is an upper plate, 15 is a hanging plate, 16 is a spring bolt, 17 is a turnbuckle, 18 is a set bolt, and 19 is a Tistan piece,
Reference numeral 20 indicates a set nut, and 21 indicates a load-travel display name plate.

Figure 4 tal and fbl are rigid...
, FIG. 5 shows Restrent R. R, Figure 6 shows anchor A
N.

FIG. 7 illustrates examples of guides GI.

FIG. 8 shows a vibration isolator VE, in which reference numeral 22 indicates a spring, 23 a mounting leg, 24 an adjustment nut, 25 a spring receiver, and 26 a relay pipe.

Returning to Figure 1, these pipe support devices installed at various locations on the plant piping are arranged at support intervals so that the stress generated in the pipes due to their own weight is kept below a specified value.
Due to the thermal expansion and contraction of pipes due to plant startup and shutdown, the reaction force and moment generated at the end of the equipment to which the pipes are connected, as well as the reactions generated in the pipes themselves, are kept below allowable values.
A vibration isolator VB is effectively installed to prevent lysine.

As mentioned above, pipe support devices do not only simply support pipes (they also have an important function to maintain the pipes in a normal condition). For,
Especially Constant Hanger CH, Spring Hanger S
Due to deterioration over time, barrier pull hangers such as H etc. may lack supporting capacity and the bearings may become stuck.As a result, the pipe support device may not be able to fulfill its initial purpose, and the pipe may be subject to stress below the design value, or may exert excessive reaction force or moment on the equipment end.

In addition, during plant construction, after the piping is installed, the turnbuckles of each pipe support are operated to adjust the hanger during cold and hot periods, and the piping is supported in a normal state under all conditions. need to be confirmed.

For the main piping for thermal power plants, constant hangers CH and spring hangers SH are often used as pipe support devices (as shown in the piping example in Figure 1), but these pipe support devices are similar to those shown in Figures 2 and 3. As shown in Figure 2, a pointer and display plate are installed to display the amount of travel corresponding to the heat transfer of the tube.

At the beginning of construction, these guidelines are adjusted to target planned values during both cold and hot periods.

After that, in order to monitor whether the pipe support device is functioning properly, the pointer should be checked and recorded both in cold and hot conditions at each periodic inspection, and if any abnormality is found in the pointer position. It is necessary to analyze the data, investigate the cause, and take necessary corrective measures.

Currently, checking, recording, and organizing and analyzing the guidelines for these tube support devices are all done manually, and when the main body of the tube support device is installed inside a tube, it may be difficult to check the guidelines, or the guidelines may be difficult to check. In addition to requiring a lot of effort to confirm and record data, a considerable amount of specialized knowledge is required to organize and analyze this data.

Moreover, for this reason, inspection and investigation of the tube support device tends to be neglected despite its importance.

The present invention has been made in view of the above-mentioned circumstances, and in order to eliminate the above-mentioned problems, some improvements have been made to the tube support device.

The purpose of this project is to save labor in inspections and investigations, and to establish a device that automatically monitors and diagnoses whether the pipe support device is functioning properly and whether the piping is being supported normally as originally planned.

A preferred embodiment of the present invention illustrated in FIG. 9 will be described in detail below with reference to FIGS. 10 and 11.

FIG. 9 illustrates the configuration of the device according to the present invention, in which 30 is a pipe, 31 is a hanger, 32 is a travel pointer,
33 is a sensor, 34 is a signal converter, 35 is a multiplexer, 36 is an analog/digital converter, 37 is a central processing unit, 38 is a read-only memory storing signal processing software, and 39 is an external storage such as a disk. device, 40 is a display such as CI'LT, 4] is a keyboard, 4
2 each indicate a printer.

In FIG. 9, a travel pointer 32 that indicates the amount of travel of the piping is attached to a hanger 31, and the movement of this travel pointer 32 changes the resistance value of a sensor 33, such as a slide resistor, connected thereto. let

The sensor 33 is not limited to this slide resistor as long as it can be converted into a form that can output the movement of the travel pointer 32 as a signal (for example, a rotary encoder or the like can also be used).

The resistance value of the sensor 33 is converted into voltage or current by a signal converter, and is simultaneously input to a multiplexer 35 and multiplexed together with signals from other hangers.

The output signal of the multiplexer 35 is converted to a digital signal convenient for data processing by a computer by an analog/digital converter 36.

The data regarding the travel amount of the piping 3o in each hanger 31 is input to the central processing unit 37, where it is processed according to the signal processing procedure written in the read-only memory.
Data is organized, stored, and calculated.

The external storage device 39 can store data signal-processed by the central processing unit 37, and can also store standard data representing the allowable travel amount for each hanger 31 using the keyboard 41.

The keyboard 41 is connected to the central processing unit 17 and can input various commands and data. display 40
can display those situations on a cathode ray tube. The printer 42 can print the output necessary data.

Next, an example of a program executed by the central processing unit 37 will be explained with reference to the flowchart shown in FIG.

In Fig. 10, first, set the input signal, for example, in the case of piping system (■), check whether the target piping is the main steam pipe or not.
Set whether it is a high temperature reheat steam pipe or auxiliary pipe, and set the hanger number J for each system.
Next, the position of the travel pointer of the hanger of the applicable system,
That is, input of the pointer position Lmo in the cold state or the pointer position LmH in the hot state is started.

l) If the input pointer position "m." or Lm) I is within the allowable range (for example, 1% to 99%), it is considered that there is no functional problem with the hanger, so input the pointer position of the next hanger. .If the input pointer position (Lr11° or LmH) is not within the permissible range, the hanger may be in an unloaded state or in a state of jiit, which is a dangerous situation, so please check the following regarding this abnormal hanger. The information is output to the display and printer. After outputting, the pointer position of the next hanger is input. This process is performed for all hangers in one system.

2) Next, since the functional diagnosis results for each hanger of the 1 system have been stored, a diagnosis regarding aging is performed based on these data.

First, the individual hanger pointer positions of the l system ("mo-1-
n or LmH-0 to n) is analyzed and inputted in advance by analyzing the relationship with the cumulative change time. A pattern showing the change in the position of the hanger pointer as the cumulative operating time of the plant increases as shown in Fig. 11. A comparison is made with the diagram, and if there is an abnormality, the corresponding abnormality pattern is output.

The patterns marked 2 to 3 in FIG. 11 show typical examples of changes over time for the hanger hanger CH, for example.

In the pattern diagram, even if the cumulative operating time increases for both the cold point pointer position (Lmo) and the hot point pointer position (LmH), the amount of change is small and can be considered normal.

In pattern (B), both the pointer position in the cold state (Lmo) and the pointer position in the hot state (LmH) become rapidly small, and the supporting force is insufficient. If there is an opposite tendency, that is, the pointer position (Lmo) in the cold state or the pointer position (LmH) in the hot state suddenly becomes thicker, the supporting force is excessive.

Pattern C) is the pointer position in the cold state (Lm, ) or the pointer position in the hot state (LmH), and the cumulative operating time is 8X1.
It has become smaller since around 0' time, and the supporting capacity has become insufficient due to aging deterioration of the nozzle.

In pattern 0, the pointer position (Lmo) in the cold state becomes large from around the cumulative operating time of 8 x 10' hours, and the pointer position (LmI()) in the -all-conditions state becomes small.In such a case, the constant hanger bearing This indicates that the deterioration of the parts has begun.

The above procedure completes the diagnosis of one system, and the same process is performed for all systems.

After the processing of all systems is completed, data is stored, recorded, etc., and the program execution is completed.

By executing the above-described processing, it becomes possible to early detect an abnormal state of a plant piping system and estimate the cause of the abnormality.

According to the present invention, the above-mentioned plant piping can be automatically monitored and diagnosed, and abnormalities in the pipe support device and piping can be detected, thereby having the effect of preventing serious accidents.

[Brief explanation of the drawing]

Fig. 1 shows an example of plant piping, Fig. 2 shows an example of a constant hanger, Fig. 3 shows an example of a spring hanger, and Fig. 4 fBl and (bl show an example of a rigid hanger). 5 is a diagram showing an example of a rest rent, FIG. 6 is a diagram showing an example of an anchor, FIG. 7 is a diagram showing an example of a guide, FIG. 8 is a diagram showing an example of a vibration isolator, FIG. 9 is a diagram showing a configuration example of the device according to the present invention, FIG. 10 is a flowchart showing an example of the operation of the device according to the present invention, and FIG.
l, +CI, and fD+ are diagrams showing examples of patterns of changes over time in constant numbers. 30... Hanger, 32... Travel pointer, 33... Sensor, 34... Signal converter, 35...
・Multiplexer, 36...Analog/digital converter, 37...Central processing unit, 38...Read-only memory,
39...external storage device, 40...display, 41...
・Keyboard, 42...Printer. Figure 7 Figure 8

Claims (1)

[Claims] a sensor device provided in each tube support device to detect the travel amount; a data storage device that stores signals from these sensor devices; a standard data storage device that stores standard data; 1. A plant piping monitoring device comprising: a comparison device for comparing data with data in a standard data storage device.