SU1800218A1 - Method of automatic detection of damage in pipe line - Google Patents

Description

The invention relates to pipeline transport, in particular to dispatch control of operating modes of heating networks.

The problem solved by the proposed invention consists in the ability to unambiguously indicate the location of the damage - a section of the return heating main or the corresponding subscriber system.

Nafig. 1 shows a block diagram of a device for technical implementation of the method; in fig. 2 is an example of a specific implementation. block for determining the difference in costs.

The device that implements the method contains flow meters 1 installed in the nodes limiting the controlled _ sections, Ν) heat pipelines, as well as flow meters 2.installed in the nodes that control the subscriber systems (I ¹ , II, '..., N '); each flow meter 1 is connected to the input of the block 3 for determining the increments of the flow rate bo of time, the outputs of the blocks 3 are connected to the inputs of the block 4 for comparing the increments, the outputs of the blocks 4 are connected to the indicators 5 of the address of the damaged section of the heat pipe; flow meters 2 of each subscriber system are connected to the inputs of the block 6 for calculating the difference in flow rates in the supply and return branches, the output of block 6 is connected to the address indicator 7 of the damaged subscriber system.

Block 3 can be made on the basis of a subtractor using analog memory, block 4 based on integrated circuits) comparator, inverter, conjunction element).

Similarly, a device based on an operating force (OA) and a comparator (K), shown in FIG. 3, where G ⁿ A - flow rate in the supply branch of the subscriber system; G ° a - the same in the reverse branch; AGa = С ^п а - G ° a - the difference between the flow rates in the supply and return branches; Us - signal

1800218 A1 to the indicator of the address of the damaged subscriber system.

With the help of blocks 3, according to signals coming from flow meters 1, at fixed time intervals, the increments of the costs of the present and previous measurements in each controlled unit are determined:

... AVk (rj) = Vk (Tj) -Vk (rj-Δϊ), where k = 1,2 ..., n;

n is the number of controlled nodes;

AVk (Tj) is the current flow rate increment in node k at time η when interrogating flow meters with discreteness Δτ;

AVk (Tj) - the value of the flow rate in the node, k at the time of the present survey η;

Vk (Tj- Δ τ) - the same at the moment of the previous survey (η ~ Δ τ).

Signals from blocks 3 are transmitted to blocks ₍ 4 comparisons of increments, where they check the fact of a change in the sign of the increments in adjacent nodes limiting this section: AV _m (i))>0; AV _m + i (Tj) <0, where m is the damaged area. In this case, a signal is given to the indicator b, for example a light signal, which indicates the address of the damaged section of the supply heat conductor.

When the sign of the increments changes from positive to negative in adjacent nodes on the return heat pipe, the location of the damage is additionally specified, since in this case, both the section of the return heat conduit and the subscriber system can be damaged. In this regard, the maintenance of the flow rate balance in the corresponding subscriber system is checked by determining the difference in flow rates in the supply (Ο ^π a) and return (G ° a) branches, for which signals from meters 2 are transmitted to unit b. where the difference of expenses AGa - | = G a - G a. In the event that the difference in costs is different from zero (AGa * 0), a signal is issued to the indicator 7, which indicates the address of the damage to the Subscriber System (in this case, the corresponding indicator 5 also functions). If the difference in flow rates in the branches is equal to zero (AGa "* 0). but the sign of the flow rate increments in adjacent nodes of the return heat pipe changes from positive to negative, this indicates the serviceability of the subscriber system and damage in the section of the return heat pipe located between these nodes. In this case, there is no signal to indicator 7 and only indicator 5 is working, which indicates the address of the damaged section of the return heat conductor.

If blocks 4 did not record a change in the sign of the flow rate increments obtained in blocks 3, then this indicates a trouble-free mode of the heating network at the time of interrogation of flow meters. In this case, the signal to the indicator 5 is absent and the next cycle of interrogation of the flow meters and the processing of the measurement information according to the given algorithm are performed.

Claims (1)

Claim A method for automatically detecting damage in a pipeline, which includes measuring at fixed time intervals the flow rates in the nodes that limit the controlled sections of the pipeline and determining the difference in flow rates, which is different from that. that, the increment of the flow rate in each node is calculated in comparison with its value in the same node at the moment of the previous polling, then the change in the sign of the increment in comparison with the sign of the increment in the previous node and when the sign of the increment in the flow rate changes from positive to negative in adjacent nodes on the opposite In the heat pipe, the difference in flow rates in the supply and return branches of the corresponding subscriber system is additionally determined, and if the difference from the specified difference is different from zero, it is concluded that this subscriber system is damaged, and if equal to zero, about damage in the section of the return heat pipe. Phil. Kommersant