Diesel tank heating and tracing pipeline maintenance protection method and heating and tracing system

Abstract

The present application relates to the technical fields of heating and heat tracing, and provides a diesel tank heating and heat tracing pipeline maintenance protection method and a heating and heat tracing system.The diesel tank heating and heat tracing pipeline maintenance protection method comprises the following steps: S1, connecting a gas injection pipeline to a heating and heat tracing water inlet pipeline; S2, closing a water inlet valve on the heating and heat tracing water inlet pipeline and a water return valve on a heating and heat tracing water return pipeline, and opening a water return lowest point drain valve on the heating and heat tracing water return pipeline; S3, injecting inert gas into the gas injection pipeline until the water return lowest point drain valve is closed when no heating water flows out from the water return lowest point drain valve.The present application can protect the inside of the pipeline, greatly reduce the risk of water accumulation and pipe freezing during maintenance, slow down the corrosion inside the pipeline, reduce the maintenance probability of the whole heating and heat tracing system, save maintenance costs, and reduce the risk of internal hot work in the oil field.

Description

Technical Field

[0001] This invention relates to the field of heating and heat tracing technology, and more specifically, to a method for the maintenance and protection of diesel tank heating and heat tracing pipelines and a heating and heat tracing system. Background Technology

[0002] When diesel tanks are placed outdoors, a heating and heat tracing system is usually used to heat the diesel tanks to prevent the diesel fuel inside from solidifying and becoming difficult to circulate in low winter temperatures (refer to patent document with publication number "CN214297506U"). That is, heating water is sent to the diesel tank through the heating and heat tracing inlet pipeline, and after the heating water exchanges heat with the diesel tank, it is sent away through the heating and heat tracing return pipeline.

[0003] During winter use, heating and heat tracing systems require timely maintenance if problems arise. However, during maintenance, water can easily accumulate and freeze inside the pipes, potentially causing them to crack. Furthermore, when the system is taken out of service, the drained heating water introduces air, accelerating corrosion. Corrosion of metal pipes necessitates hot work for maintenance, while repairs of plastic pipes require electric heating, posing a high risk of open flame in oil-filled areas. Therefore, protecting heating and heat tracing pipelines during maintenance is a pressing issue that needs to be addressed. Summary of the Invention

[0004] The purpose of this invention is to provide a method for the maintenance and protection of diesel tank heating and heat tracing pipelines and a heating and heat tracing system.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] The maintenance and protection methods for diesel tank heating and heat tracing pipelines include the following steps:

[0007] S1. Connect the air injection pipeline to the heating and heat tracing water inlet pipeline;

[0008] S2. Close the main inlet valve on the heating and heat tracing inlet water pipeline and the main return water valve on the heating and heat tracing return water pipeline, and open the drain valve at the lowest point of the return water on the heating and heat tracing return water pipeline.

[0009] S3. Inject inert gas into the gas injection line until no heating water flows out of the drain valve at the lowest point of the return water and then close it.

[0010] Optionally, the gas injection line is provided with...

[0011] Optionally, the inert gas is nitrogen.

[0012] This invention also provides a heating and heat tracing system, which utilizes the maintenance and protection method for diesel tank heating and heat tracing pipelines described in any of the above-mentioned methods, including:

[0013] The heating and heat tracing water inlet main line is equipped with a main inlet valve, and the air injection line is connected after the main inlet valve on the heating and heat tracing water inlet main line.

[0014] Heating and heat tracing return water main line; a return water main valve is installed on the heating and heat tracing return water main line;

[0015] One or more diesel tanks, with the inlet end of the diesel tank connected to a heating and heat tracing inlet branch pipeline, which is connected to the main heating and heat tracing inlet pipeline; and the outlet end of the diesel tank connected to a heating and heat tracing return branch pipeline, which is connected to the main heating and heat tracing return pipeline.

[0016] At least one water inlet valve is provided on the heating and tracing water inlet branch line;

[0017] At least one return water valve is installed on the return water branch line of the heating and tracing system.

[0018] The drain valve at the lowest point of the inlet water line is located at the lowest point of the main inlet water line for heating and heat tracing.

[0019] The return water drain valve is located at the lowest point of the main return water line for heating and tracing.

[0020] Optionally, the heating and heat tracing inlet branch pipeline and / or the heating and heat tracing return branch pipeline are connected to a venting pipeline, and a venting valve is provided on the venting pipeline; the venting pipeline connected to the heating and heat tracing inlet branch pipeline is located between the inlet valve and the diesel tank, and the venting pipeline connected to the heating and heat tracing return branch pipeline is located between the return valve and the diesel tank.

[0021] Optionally, both the inlet water valve and the return water valve are provided in twos.

[0022] Optionally, the vent line on the heating and heat tracing inlet branch line is connected between two inlet water valves; the vent line on the heating and heat tracing return branch line is connected between two return water valves.

[0023] Optionally, both the heating and heat tracing inlet branch pipeline and the heating and heat tracing return branch pipeline are connected to vent pipelines.

[0024] The present invention has at least the following advantages and beneficial effects: In this invention, by connecting an air injection pipeline to the heating and heat tracing inlet water pipeline, during the maintenance of the heating and heat tracing pipeline, the main inlet valve on the heating and heat tracing inlet water pipeline and the main return water valve on the heating and heat tracing return water pipeline are closed, the drain valve at the lowest point of the return water on the heating and heat tracing return water pipeline is opened, and then inert gas is injected through the air injection pipeline to drain the accumulated water in each pipe of the heating and heat tracing pipeline, while filling the pipe with inert gas, which protects the inside of the pipe, greatly reduces the risk of water accumulation freezing the pipe during maintenance, slows down the internal corrosion of the pipe, reduces the maintenance probability of the entire heating and heat tracing system, saves maintenance costs, and reduces the risk of hot work operations inside the oil area. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A simplified flowchart illustrating the steps of the diesel tank heating and heat tracing pipeline maintenance and protection method provided by the present invention.

[0027] Figure 2 Here is a simplified structural diagram of the heating and heat tracing system provided by the present invention;

[0028] Icons: 1-Air injection line, 101-Air injection main valve, 2-Heating and heat tracing inlet water main line, 201-Inlet water main valve, 202-Inlet water lowest point drain valve, 3-Heating and heat tracing return water main line, 301-Return water main valve, 302-Return water lowest point drain valve, 4-Diesel tank, 5-Heating and heat tracing inlet water branch line, 501-Inlet water valve, 6-Heating and heat tracing return water branch line, 601-Return water valve, 7-Vent line, 701-Vent valve. Detailed Implementation

[0029] Example 1

[0030] This embodiment provides a method for the maintenance and protection of diesel tank heating and heat tracing pipelines, including the following steps (see reference). Figure 1 ):

[0031] S1. Connect the air injection line 1 to the heating and heat tracing inlet water line. In this embodiment, the air injection line 1 is equipped with an air injection main valve 101. When the air injection line 1 is not in use, a blind flange is installed at its inlet (the blind flange can be connected to the pipe opening via a flange to seal the pipe opening). This allows the air injection line 1 to be closed when the heating and heat tracing line is operating normally, preventing water and air from crossing pipes. Furthermore, the closer the air injection main valve 101 is to the heating and heat tracing inlet water line, the better, to avoid a large accumulation of heating water on the air injection line 1 between the heating and heat tracing inlet water line and the air injection main valve 101 during normal operation, thus preventing resource waste.

[0032] S2. Close the main inlet valve 201 on the heating tracing inlet water pipeline and the main return valve 301 on the heating tracing return water pipeline. Open the lowest point drain valve 202 on the heating tracing inlet water pipeline and the lowest point drain valve 302 on the heating tracing return water pipeline to drain the water from the pipelines. Then close the lowest point drain valve 302 on the heating tracing return water pipeline while keeping the lowest point drain valve 202 on the heating tracing inlet water pipeline open. It should be understood that... Air line 1 should be located after the main inlet valve 201. Closing the main inlet valve 201 on the heating and heat tracing inlet water line and the main return valve 301 on the heating and heat tracing return water line can prepare for air injection into the heating and heat tracing pipeline, ensuring that there is no water intake during air injection and avoiding water backflow (i.e., the heat tracing system stops working). Keeping the drain valve 202 at the lowest point of the inlet water line closed and the drain valve 302 at the lowest point of the return water line open, so that the water accumulated in the pipeline can be completely discharged from the drain valve 302 at the lowest point of the return water line during air injection.

[0033] S3. Inject inert gas into the gas injection line 1 until no heating water flows out of the return water drain valve 302 at the lowest point. Then close the return water drain valve 302. In this embodiment, nitrogen is used as the inert gas, which is low in cost (it should be understood that in other embodiments of the invention, other inert gases such as argon can also be selected). It is worth noting that when no heating water flows out of the return water drain valve 302 at the lowest point, it means that the water accumulated in each pipe of the heating and heat tracing pipeline has been drained. At the same time, the pipe is filled with nitrogen. There is no water accumulation in the pipe and it is protected by nitrogen, which can protect the inside of the pipe, greatly reduce the risk of water accumulation and pipe freezing during maintenance, slow down the internal corrosion of the pipe, reduce the maintenance probability of the entire heating and heat tracing system, save maintenance costs, and reduce the risk of hot work in the oil area.

[0034] Example 2

[0035] Please refer to Figure 2This embodiment provides a heating and heat tracing system, applying the maintenance and protection method for the heating and heat tracing pipeline of diesel tank 4 provided in Embodiment 1. Specifically, the heating and heat tracing system includes a heating and heat tracing inlet water main line 2, a heating and heat tracing return water main line 3, one or more diesel tanks 4, at least one inlet water valve 501, at least one return water valve 601, an inlet water lowest point drain valve 202, and a return water lowest point drain valve 302.

[0036] The heating and heat tracing inlet water main line 2 is equipped with an inlet main valve 201. The air injection line 1 is connected to the inlet main valve 201 on the heating and heat tracing inlet water main line 2 so as to inject inert gas to protect the internal parts of each pipe of the heating and heat tracing system by means of the method provided in Embodiment 1. It is easy to understand that in actual application, the inlet end of the heating and heat tracing inlet water main line 2 is connected to the water supply equipment (not shown in the figure), and the inlet main valve 201 controls the opening and closing of the heating and heat tracing inlet water main line 2. The heating and heat tracing return water main line 3 is equipped with a return water main valve 301 to control the opening and closing of the heating and heat tracing return water main line 3.

[0037] In this embodiment, two diesel tanks 4 are provided (it is easy to understand that the number of diesel tanks 4 can be set to one or more according to the needs). The water inlet end of each diesel tank 4 is connected to a heating and heat tracing water inlet branch line 5, and the water outlet end of each diesel tank 4 is connected to a heating and heat tracing water return branch line 6. The heating and heat tracing water inlet branch line 5 is connected to the heating and heat tracing water inlet main line 2, and the heating and heat tracing water return branch line 6 is connected to the heating and heat tracing water return main line 3. That is, the two diesel tanks 4 form a parallel relationship. When the heating and heat tracing system is working, the heating water enters from the heating and heat tracing water inlet main line 2, then flows to the heating and heat tracing water inlet branch line 5 of each diesel tank 4 and reaches the diesel tank 4 to undergo heat exchange. After heat exchange, it flows out through the heating and heat tracing water return branch line 6 of each diesel tank 4, and finally flows into the heating and heat tracing water return main line 3 and flows out from the heating and heat tracing water return main line 3.

[0038] The inlet water valve 501 is installed on the heating and heat tracing inlet water branch line 5, that is, each diesel tank 4 is equipped with an inlet water valve 501 on its heating and heat tracing inlet water branch line 5, so as to control the water inlet of each diesel tank 4 individually; the return water valve 601 is installed on the heating and heat tracing return water branch line 6, that is, each diesel tank 4 is equipped with a return water valve 601 on its heating and heat tracing return water branch line 6, so as to control the return water of each diesel tank 4 individually.

[0039] In this embodiment, there are two inlet water valves 501 and two return water valves 601. The probability of both inlet water valves 501 or return water valves 601 failing at the same time is small. This setting can improve the failure resistance rate and prevent the heating and heat tracing inlet water branch line 5 and heating and heat tracing return water branch line 6 from losing control if the inlet water valve 501 and the return water valve 601 fail.

[0040] In this embodiment, both the heating and heat tracing inlet branch line 5 and the heating and heat tracing return branch line 6 are connected to a vent line 7. The vent line 7 is equipped with a vent valve 701. The vent line 7 connected to the heating and heat tracing inlet branch line 5 is located between the inlet valve 501 and the diesel tank 4. The vent line 7 connected to the heating and heat tracing return branch line 6 is located between the return valve 601 and the diesel tank 4.

[0041] It is worth noting that, based on the above, the flow rate can be observed through the vent valve 701. Specifically, close the inlet valve 501 of the heating and tracing water inlet branch line 5 of the diesel tank 4 away from the diesel tank 4 (open the inlet valve 501 near the diesel tank 4), and at the same time, slightly open the return valve 601 of the heating and tracing water return branch line 6 of the diesel tank 4 away from the diesel tank 4. Open the vent valve 701 on any vent line 7, and observe the heating water flow rate of the current heating and tracing branch line of the diesel tank 4 by observing the flow rate of the heating water flowing out through the vent line 7. Compared with the traditional heating and tracing system, there is no need to install flow meters or other components to observe the flow rate, which can greatly reduce the cost of the heating and tracing system.

[0042] Furthermore, in this embodiment, the vent pipe 7 on the heating and heat tracing inlet branch pipe 5 is connected between two inlet water valves 501, and the vent pipe 7 on the heating and heat tracing return branch pipe 6 is connected between two return water valves 601.

[0043] In addition, in other embodiments of the present invention, a venting pipeline 7 may be connected and a venting valve 701 may be installed on either the heating and heat tracing inlet branch pipeline 5 or the heating and heat tracing return branch pipeline 6.

[0044] In this embodiment, the lowest point of the heating and heat tracing inlet water main line 2 is provided with a water inlet drain valve 202, and the lowest point of the heating and heat tracing return water main line 3 is provided with a return water drain valve 302. It is worth noting that by setting valves at the lowest points of the pipelines, it is convenient to drain the heating water in the heating and heat tracing inlet water main line 2 and the heating and heat tracing return water main line 3 before maintenance by using the method described in Implementation 1.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. The inspection and protection methods for heating and heat tracing systems include the following steps: S1. Connect the air injection pipeline to the heating and heat tracing water inlet pipeline; S2. Close the main inlet valve on the heating tracing inlet pipeline and the main return valve on the heating tracing return pipeline, and open the drain valve at the lowest point of the return water on the heating tracing return pipeline; S3. Inject inert gas into the air injection pipeline until no heating water flows out of the drain valve at the lowest point of the return water, then close it; characterized in that the heating tracing system includes: The heating and heat tracing water inlet main line is equipped with a main inlet valve, and the air injection line is connected after the main inlet valve on the heating and heat tracing water inlet main line. Heating and heat tracing return water main line; a return water main valve is installed on the heating and heat tracing return water main line; One or more diesel tanks, with the inlet end of the diesel tank connected to a heating and heat tracing inlet branch pipeline, which is connected to the main heating and heat tracing inlet pipeline; and the outlet end of the diesel tank connected to a heating and heat tracing return branch pipeline, which is connected to the main heating and heat tracing return pipeline. At least one water inlet valve is provided on the heating and tracing water inlet branch line; At least one return water valve is installed on the return water branch line of the heating and tracing system. The drain valve at the lowest point of the inlet water line is located at the lowest point of the main inlet water line for heating and heat tracing. The return water drain valve is located at the lowest point of the main return water line for heating and tracing. The heating and heat tracing inlet branch pipeline and / or the heating and heat tracing return branch pipeline are connected to a venting pipeline, and a venting valve is provided on the venting pipeline; the venting pipeline connected to the heating and heat tracing inlet branch pipeline is located between the inlet valve and the diesel tank, and the venting pipeline connected to the heating and heat tracing return branch pipeline is located between the return valve and the diesel tank. Close the inlet valve of the heating and tracing water inlet branch line of the diesel tank that is far from the diesel tank, and open the inlet valve of the branch line of the heating and tracing water inlet line that is close to the diesel tank. At the same time, slightly open the return valve of the heating and tracing water return branch line of the diesel tank that is far from the diesel tank. Open the vent valve on any vent line and observe the current heating water flow rate of the heating and tracing water inlet branch line of the diesel tank through the flow rate of the heating water flowing out of the vent line.

2. The maintenance and protection method for a heating and heat tracing system according to claim 1, characterized in that: The gas injection line is equipped with a main gas injection valve.

3. The maintenance and protection method for a heating and heat tracing system according to claim 1, characterized in that: The inert gas is nitrogen.

4. The method for inspection and protection of a heating and heat tracing system according to claim 1, characterized in that, There are two inlet water valves and two outlet water valves.

5. The method for inspection and protection of a heating and heat tracing system according to claim 4, characterized in that, The vent line on the heating and heat tracing inlet branch line is connected between two inlet water valves; the vent line on the heating and heat tracing return branch line is connected between two return water valves.

6. The method for inspection and protection of a heating and heat tracing system according to claim 1, characterized in that, Both the heating and heat tracing inlet branch pipeline and the heating and heat tracing return branch pipeline are connected to vent pipelines.

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