Accelerated comparison test evaluation method and system for anti-scaling performance of plastic pipeline

Abstract

The invention discloses an accelerated comparison test evaluation method and system for anti-scaling performance of a plastic pipeline, the system comprises a constant-temperature water tank and a plurality of test units, a water outlet of the constant-temperature water tank is connected with input ends of the test units through input pipes, and a water return port of the constant-temperature water tank is connected with output ends of the test units through output pipes; each test unit comprises a plurality of test branches, each test branch is provided with a branch input port and a branch output port, and the branch input ports are connected and connected with the output port of the constant-temperature water tank through the input port of the test unit where the branch input ports are located; according to the system disclosed by the invention, the scaling conditions of the tested pipeline in different periods can be tested by constructing a plurality of groups of pipelines, and the scaling speed of the pipeline is accelerated by proportioning related solutions. The anti-scaling capacity of the pipeline is judged by weighing the weight difference of the pipeline before and after testing. The smaller the weight increase is, the better the anti-scaling capability of the detected pipeline is.

Description

Technical Field

[0001] This invention belongs to the field of fluid transport pipeline testing technology, specifically relating to an accelerated comparative testing and evaluation method and system for the anti-scaling performance of plastic pipes. Background Technology

[0002] With increasing demands for drinking water hygiene and heating efficiency, the problem of scale buildup on pipe walls is receiving growing attention. Scale not only affects water quality safety but also reduces the heat transfer efficiency and flow cross-section of pipes. Currently, the industry lacks a standardized testing and evaluation platform that can accelerate the simulation of pipe scaling processes and objectively compare the anti-scaling performance of pipes made of different materials. Existing testing methods often suffer from long cycles and limited environmental conditions, making it difficult to meet the rapid screening needs of product development and quality control.

[0003] Therefore, this invention proposes an accelerated comparative testing and evaluation method and system for the anti-scaling performance of plastic pipes. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide an accelerated comparative test evaluation method and system for the anti-scaling performance of plastic pipes, aiming to solve the problem of the lack of standardized comparative test methods in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: An accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes includes a constant temperature water tank and several test units. The outlet of the constant temperature water tank is connected to the input end of the test unit via an input pipe, and the return port of the constant temperature water tank is connected to the output end of the test unit via an output pipe. Each test unit includes several test branches, each test branch having a branch input port and a branch output port. Each branch input port is connected to the output port of the constant temperature water tank via the input port of its respective test unit; each branch output port is connected to the return port of the constant temperature water tank via the output port of its respective test unit.

[0006] Furthermore, the test branch includes a pipe under test, both ends of which are connected to stainless steel corrugated hoses. The stainless steel corrugated hoses are connected to the corresponding ports of the pipe under test via press-fit adapters. The stainless steel corrugated hose at the input port of the test branch is connected to a male threaded union, which is connected to a U-shaped pipe. A branch flow meter is installed on the branch of the U-shaped pipe. A No. 2 shut-off valve is installed on one side of the U-shaped pipe, and a No. 3 and a No. 4 shut-off valve are installed on the other side of the U-shaped pipe. The input port of the branch of the U-shaped pipe is connected to the outlet of the constant temperature water tank. The stainless steel corrugated hose at the output port of the test branch is connected to a male threaded union, which is connected to a No. 1 shut-off valve. The No. 1 shut-off valve is connected to a flow regulating valve.

[0007] Furthermore, the constant temperature water tank includes a water tank body, inside which a stirrer and a heating grid are provided, and a temperature sensor and several liquid level sensors are installed on the inner wall of the water tank body; an insulated movable cover is provided at the top port of the water tank body.

[0008] Furthermore, the water tank body is provided with a water inlet and a drain outlet.

[0009] Furthermore, it includes a circulating pump, and the outlet of the constant temperature water tank is connected to the liquid channel of the circulating pump and the input end of the test unit through an input pipe.

[0010] Furthermore, a first-line shut-off valve, a pressure gauge, and a main-line flow regulating valve are sequentially installed on the input pipe from the constant temperature water tank to the input end of the test unit; A No. 2 main shut-off valve is installed on the output pipe from the constant temperature water tank to the circulation pump section, and a clamp-on flow meter is installed on the output pipe from the circulation pump to the output end of the test unit.

[0011] Furthermore, the device includes a heat insulation cover, and the test unit is installed inside the heat insulation cover. The test unit includes 48 test branches.

[0012] This invention proposes an accelerated comparative testing and evaluation method for the anti-scaling performance of plastic pipes using the aforementioned system, comprising the following steps: 1) Sample preparation and initial load-bearing First, take 48 clean sample tubes and number them sequentially as 1, 2...47, 48; clean and dry the tubes one by one; then remove the dried tubes and weigh them, recording the initial weight of each sample as A1, A2...A... 47 A 48 Label each pipe with its number and record the data; finally, install the sample tubes sequentially onto the corresponding branches of the test platform, ensuring that the connections are securely sealed and without any looseness. 2) After step 1) is completed, first open the No. 1 main circuit shut-off valve and the No. 2 main circuit shut-off valve, then open the No. 1 shut-off valve, the No. 2 shut-off valve, and the No. 3 shut-off valve of the branch to be tested, and close the No. 4 shut-off valve. Next, open the water inlet and inject the water of the specified experimental quality. Observe the liquid level probe and stop injecting water when the water level reaches the set height. Start the circulation pump to fill all branches with water. Gently tap the pipes to help expel air bubbles until no air bubbles emerge from the outlets of each branch. Close the water inlet and observe the readings of the system pressure gauge and the main flow meter, and wait for them to stabilize. Adjust the flow regulating valves of each branch in turn to ensure that the flow rate of each branch falls within the calculation range. Record the stable reading of the clamp-on flow meter of the main line at this time as the reference flow rate for subsequent experiments. Next, shut off the circulating pump, close the No. 2 and No. 3 shut-off valves of each branch, and open the No. 4 shut-off valve. 3) After step 2) is completed, start the circulation pump, turn on the heating grid, raise the water temperature in the system to the experimental set temperature and keep it stable. According to the test environment of the scaling experiment, prepare the relevant solutions, dissolve each reagent separately in the container and pour them into the constant temperature water tank in sequence, while recording the addition time and environmental conditions. 4) After step 3) is completed, adjust the main flow regulating valve to restore the main flow to the reference value recorded during hydraulic balance adjustment. Then, keep the system running continuously at the set temperature and flow, and monitor and record the key parameters of pressure, temperature and flow. 5) After step 4) is completed, select 4 branches every 15 days in a predetermined order, close the No. 1 and No. 4 shut-off valves of the corresponding branches; disassemble the press-fit adapter, carefully remove the sample tube; drain the liquid in the tube, rinse the inner wall, then dry, cool and weigh, and record the weight after sampling B1, B2, B3, B4 and so on. Reinstall the tested sample tubes into the original branches; open the No. 1 and No. 4 shut-off valves of the branch to allow it to re-enter the circulation.

[0013] Further, in step 5), the weight change of a single sample tube is calculated as Δm = B1 - A1; the weight change of the four tubes sampled in this time is taken as the arithmetic mean and recorded.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) This invention proposes an accelerated comparative test evaluation method for the anti-scaling performance of plastic pipes, aiming to solve the problem of the lack of standardized comparative test methods in the existing technology; 2) This invention's system, by constructing multiple sets of pipelines, can test the scaling conditions of the tested pipeline at different stages. It uses a specially formulated solution to accelerate the scaling process. The pipeline's anti-scaling capability is determined by weighing the difference in weight before and after the test. A smaller increase in weight indicates better anti-scaling capability, and vice versa. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall system structure of the present invention; Figure 2 This is a schematic diagram of the test pipeline installation for the present invention; Figure 3 This is a schematic diagram of the water tank structure of the present invention.

[0016] In the diagram: 1. Constant temperature water tank; 101. Outlet; 102. Return outlet; 2. No. 2 shut-off valve; 3. Stainless steel corrugated hose; 4. Press-fit adapter; 5. Male threaded union; 6. U-shaped pipe; 7. Branch flow meter; 8. No. 3 shut-off valve; 9. No. 4 shut-off valve; 10. No. 1 shut-off valve; 11. Flow regulating valve; 12. Agitator; 13. Heating grid; 14. Temperature sensor; 15. Liquid level sensor; 16. Insulated movable cover; 17. Water inlet; 18. Sewage outlet; 19. Circulating pump; 20. No. 1 main shut-off valve; 21. Pressure gauge; 22. Main flow regulating valve; 23. No. 2 main shut-off valve; 24. Tested pipeline; 25. Clamp-on flow meter; 26. Insulation cover. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the scope described.

[0018] Please refer to Figure 1-3 An accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes includes a constant temperature water tank 1 for preparing and storing a simulated scaling solution and several test units. The outlet 101 of the constant temperature water tank 1 is connected to the input end of the test unit via an input pipe, and the return water outlet 102 of the constant temperature water tank 1 is connected to the output end of the test unit via an output pipe. Each test unit includes several test branches, each with a branch input port and a branch output port. Each branch input port is connected to the output port of the constant temperature water tank 1 via the input port of its respective test unit; each branch output port is connected to the return water outlet of the constant temperature water tank 1 via the output port of its respective test unit.

[0019] The test branch includes the test pipe 24, with stainless steel corrugated hoses 3 connected to both ends of the test pipe 24. The stainless steel corrugated hoses 3 are connected to the corresponding ports of the test pipe via press-fit adapters 4. A male threaded union 5 is connected to the stainless steel corrugated hose 3 at the inlet of the test branch, facilitating the removal of the test pipe and compensating for thermal expansion and contraction. A U-shaped pipe 6 is connected to the U-shaped pipe 6, with a branch flow meter 7 installed at the branch pipe. A second shut-off valve 2 is installed on one side of the U-shaped pipe 6, and a third shut-off valve 8 and a fourth shut-off valve 9 are installed on the other side of the U-shaped pipe 6, used to independently regulate the flow rate of each branch and achieve hydraulic balance. The inlet of the branch pipe on the side of the U-shaped pipe 6 is connected to the outlet of the constant temperature water tank 1. A male threaded union 5 is connected to the stainless steel corrugated hose 3 at the outlet of the test branch, with a first shut-off valve 10 connected to the first shut-off valve 10, which is connected to a flow regulating valve 11.

[0020] The constant temperature water tank 1 includes a water tank body, inside which a stirrer 12 and a heating grid 13 are installed, and a temperature sensor 14 and several liquid level sensors 15 are installed on the inner wall of the water tank body; an insulated movable cover 16 is provided at the top port of the water tank body.

[0021] In this embodiment, the water tank body is provided with a water inlet 17 and a drain outlet 18.

[0022] The system of the present invention also includes a circulation pump 19, and the outlet 101 of the constant temperature water tank 1 is connected to the liquid channel of the circulation pump 19 and the input end of the test unit through an input pipe.

[0023] The input pipe from the constant temperature water tank 1 to the input end of the test unit is equipped with a No. 1 main circuit shut-off valve 20, a pressure gauge 21, and a main circuit flow regulating valve 22, which are used to provide power and maintain the system's constant temperature and pressure circulation.

[0024] A No. 2 main circuit shut-off valve 23 is installed on the output pipe from the constant temperature water tank 1 to the circulation pump 19, and a clamp-on flow meter 25 is installed on the output pipe from the circulation pump 19 to the output end of the test unit.

[0025] The system of the present invention also includes a heat insulation cover 26, and the test unit is installed inside the heat insulation cover 26. The test unit includes 48 test branches.

[0026] This invention also proposes an accelerated comparative testing method for the anti-scaling performance of plastic pipes using the aforementioned system, comprising the following steps: (1) Sample preparation and initial load-bearing

[0027] First, take 48 clean sample tubes, each 2 meters in length, and number them sequentially as 1, 2...47, 48. Rinse the inner walls of the tubes sequentially with tap water and deionized water, and finally ultrasonically clean them with anhydrous ethanol for 15 minutes. After removing them, place all the sample tubes horizontally in an oven at 70°C and dry them continuously for 1 hour to completely remove residual moisture until constant weight. Then, remove the dried tubes and weigh them individually using a precision balance, recording the initial weight of each sample (accurate to 0.01g) as A1, A2...A... 47 A 48 Label each pipe with its number and record the data; finally, install the sample tubes sequentially onto the corresponding branches of the test platform, ensuring that the connections are securely sealed and without any looseness. (2) Hydraulic balance regulation

[0028] To start the main water supply: First, open the No. 1 main line shut-off valve 20 and the No. 2 main line shut-off valve 23. Then, open the No. 1 shut-off valve 10, the No. 2 shut-off valve 2, and the No. 3 shut-off valve 8 of the branch to be tested, and close the No. 4 shut-off valve 9. System water filling and venting: Open water inlet 17 to inject deionized water (or water of the specified experimental quality), observe the level probe 15, and stop water filling once the water level reaches the set height. Start the circulation pump 19 to fill all branches with water. Gently tap the pipes to help expel air bubbles until no air bubbles emerge from the outlets of each branch. Close water inlet 17 and observe the system pressure gauge and main flow meter readings, waiting for them to stabilize.

[0029] Flow regulation and balancing: Calculate the target flow range based on the pipe's inner diameter: Flow rate = pipe cross-sectional area × flow velocity (2~3 m / s); adjust the flow regulating valves of each branch sequentially to ensure that the flow rate of each branch falls within the calculated range, and that the difference between the maximum and minimum flow rates in all branches does not exceed 5%. Record the stable reading of the clamp-on flow meter 25 in the main branch at this time as the reference flow rate for subsequent experiments.

[0030] Adjusted system settings: Turn off circulation pump 19, close the No. 2 shut-off valve 2 and No. 3 shut-off valve 8 of each branch, and open the No. 4 shut-off valve 9 (switch to test circulation path). (3) Feeding

[0031] System preheating: Start the circulation pump 19 and turn on the heating grid 13 to raise the water temperature in the system to the experimental set temperature and maintain it stable. Based on the testing environment of the scaling experiment, the relevant solution concentrations are as follows: Serial Number Element Concentration (mg / L) 1 Anhydrous calcium chloride 1000 2 Magnesium sulfate 1000 3 Sodium bicarbonate 200 Feeding operation: Calculate the volume of water in the water tank according to the water level in water tank 1. Calculate the weight of each reagent according to the formula: solute = solution × concentration. Weigh and measure the reagent. Dissolve each reagent separately in a container and pour it into the water tank in sequence. Record the addition time and environmental conditions at the same time. (4) Cyclic Experiment

[0032] Flow Reset: Adjust the main flow regulating valve 22 to restore the main flow rate to the reference value recorded during hydraulic balance adjustment. Continuous Operation: Maintain continuous operation of the system at the set temperature and flow rate, monitoring and recording key parameters such as pressure, temperature, and flow rate. (5) Sampling analysis

[0033] Sampling plan: Every 15 days, four branches will be selected in a predetermined order (e.g., the first time, branches numbered 1, 2, 3, and 4 will be selected; the second time, branches numbered 6, 7, 8, and 9 will be selected, and so on).

[0034] Sampling procedure: Close the No. 1 shut-off valve 10 and the No. 4 shut-off valve 9 of the corresponding branch; disassemble the clamp-type adapter 4 and carefully remove the sample tube; drain the liquid in the tube, gently rinse the inner wall with deionized water, then put it in an oven and dry at 70°C for 1 hour. After cooling, weigh the sample and record the weights B1, B2, B3, B4, and so on.

[0035] Data processing: Calculate the weight change of a single sample tube: Δm = B1 - A1 (A1 is the initial weight, B1 is the weight after sampling); the arithmetic mean of the weight changes of the four tubes sampled in this time is taken and recorded.

[0036] Sample tube reset: Reinstall the tested sample tube back into the original branch; open the No. 1 shut-off valve 10 and No. 4 shut-off valve 9 of this branch to allow it to re-enter the circulation, but not to be included in the subsequent sampling test range (only to maintain hydraulic balance).

Claims

1. An accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes, characterized in that... The test unit includes a constant temperature water tank (1) and several test units. The outlet (101) of the constant temperature water tank (1) is connected to the input end of the test unit through an input pipe. The return water outlet (102) of the constant temperature water tank (1) is connected to the output end of the test unit through an output pipe. The test unit includes several test branches. Each test branch has a branch input port and a branch output port. Each branch input port is connected to the output port of the constant temperature water tank (1) through the input port of its respective test unit. Each branch output port is connected to the return water outlet of the constant temperature water tank (1) through the output port of its respective test unit.

2. The accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes according to claim 1, characterized in that... The test branch includes a test pipe (24), both ends of which are connected to stainless steel corrugated hoses (3). The stainless steel corrugated hoses (3) are connected to the corresponding ports of the test pipe via a press-fit adapter (4). The stainless steel corrugated hose (3) at the input port of the test branch is connected to a male threaded union (5). The male threaded union (5) is connected to a loop pipe (6). A branch flow meter (7) is installed at the branch pipe of the loop pipe (6). A No. 2 shut-off valve (2) is installed on one side of the branch pipe, and a No. 3 shut-off valve (8) and a No. 4 shut-off valve (9) are installed on the other side of the branch pipe of the loop pipe (6). The inlet of the branch pipe on the side of the loop pipe (6) is connected to the outlet of the constant temperature water tank (1). The stainless steel corrugated hose (3) located at the outlet of the test branch is connected to a male threaded union (5), wherein the male threaded union (5) is connected to a No. 1 shut-off valve (10), and the No. 1 shut-off valve (10) is connected to a flow regulating valve (11).

3. An accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes according to claim 1 or 2, characterized in that... The constant temperature water tank (1) includes a water tank body, inside which is provided a stirrer (12) and a heating grid (13), and a temperature sensor (14) and several liquid level sensors (15) are installed on the inner wall of the water tank body; a heat-insulating movable cover (16) is provided at the top port of the water tank body.

4. The accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes according to claim 3, characterized in that... The water tank body is provided with a water inlet (17) and a sewage outlet (18).

5. An accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes according to claim 1 or 4, characterized in that... The system includes a circulating pump (19), and the outlet (101) of the constant temperature water tank (1) is connected to the liquid channel of the circulating pump (19) and the input end of the test unit via an input pipe.

6. The accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes according to claim 5, characterized in that... The input pipe is sequentially equipped with a No. 1 main circuit shut-off valve (20), a pressure gauge (21), and a main circuit flow regulating valve (22) from the constant temperature water tank (1) to the input end of the test unit. The output pipe from the constant temperature water tank (1) to the circulation pump (19) is equipped with a No. 2 main road shut-off valve (23), and the output pipe from the circulation pump (19) to the output end of the test unit is equipped with a clamp-on flow meter (25).

7. The accelerated comparative testing and evaluation system for the anti-scaling performance of plastic pipes according to claim 1, characterized in that... Includes a heat insulation cover (26), the test unit is installed inside the heat insulation cover (26), and the test unit includes 48 test branches.

8. A method for accelerated comparative testing and evaluation of the anti-scaling performance of plastic pipes using the system described in any one of claims 1-7, characterized in that... Includes the following steps: 1) Sample preparation and initial load-bearing First, take 48 clean sample tubes and number them sequentially as 1, 2...47, 48; clean and dry the tubes one by one; then remove the dried tubes and weigh them, recording the initial weight of each sample as A1, A2...A... 47 A 48 Label each pipe with its number and record the data; finally, install the sample tubes sequentially onto the corresponding branches of the test platform, ensuring that the connections are securely sealed and without any looseness. 2) After step 1) is completed, first open the No. 1 main circuit shut-off valve (20) and the No. 2 main circuit shut-off valve (23), open the No. 1 shut-off valve (10), the No. 2 shut-off valve (2), and the No. 3 shut-off valve (8) of the branch to be tested, and close the No. 4 shut-off valve (9). Then, open the water inlet (17) and inject the water of the specified experimental quality. Observe the liquid level probe (15). Stop injecting water after the water level reaches the set height. Start the circulation pump (19) to fill all branches with water. Gently tap the pipes to help the air bubbles to be expelled until no air bubbles emerge from the outlets of each branch. Close the water inlet (17) and observe the readings of the system pressure gauge and the main flow meter. Wait for them to stabilize. Adjust the flow regulating valves of each branch in sequence so that the flow of each branch falls within the calculation range. Record the stable reading of the clamp-on flow meter of the main branch at this time as the reference flow for subsequent experiments. Next, shut off the circulating pump (19), close the No. 2 shut-off valve (2) and No. 3 shut-off valve (8) of each branch, and open the No. 4 shut-off valve (9). 3) After step 2) is completed, start the circulation pump (19), turn on the heating net (13), raise the water temperature in the system to the experimental set temperature and keep it stable. According to the test environment of the scaling experiment, prepare the relevant solutions, dissolve each reagent separately in the container and pour them into the constant temperature water tank (1) in sequence, and record the addition time and environmental conditions at the same time. 4) After step 3) is completed, adjust the main flow regulating valve to restore the main flow to the reference value recorded during hydraulic balance adjustment. Then, keep the system running continuously at the set temperature and flow, and monitor and record the key parameters of pressure, temperature and flow. 5) After step 4) is completed, select 4 branches in a predetermined order every 15 days, close the No. 1 shut-off valve (10) and No. 4 shut-off valve (9) of the corresponding branch; disassemble the clamp-type adapter (4), carefully take out the sample tube; drain the liquid in the tube, rinse the inner wall, then dry, cool and weigh, and record the weight after sampling B1, B2, B3, B4 in sequence, and reinstall the tested sample tube into the original branch; open the No. 1 shut-off valve (10) and No. 4 shut-off valve (9) of the branch to make it participate in the cycle again.

9. The accelerated comparative test and evaluation method for the anti-scaling performance of plastic pipes according to claim 8, characterized in that... In step 5), the weight change of a single sample tube is calculated as Δm = B1 - A1; the weight change of the four tubes sampled in this time is taken as the arithmetic mean and recorded.

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