Full-size non-metal pipe flammable and explosive and harmful gas penetration test method

Abstract

The embodiment of the invention provides a full-size non-metal pipe flammable and explosive and harmful gas permeation test method. The technical problem that the accuracy of the gas permeation coefficient in a non-metal composite pipe is low can be solved. The method comprises the following steps: confirming a first gas permeability coefficient of a first lining film under the condition that first gas is at a first temperature; confirming a second gas permeability coefficient of the first lining film under the condition that the second gas is at the first temperature; obtaining a first correction coefficient based on the ratio of the second gas permeability coefficient to the first gas permeability coefficient; determining the first gas permeation amount according to the gas permeation test curve of the first lining film under the condition of the first gas; determining a second gas permeation amount based on the first gas permeation amount and the slope of the gas permeation test curve; and obtaining a third gas permeability coefficient according to the first correction coefficient and the second gas permeability. The problem that the danger coefficient of full-size gas permeation test of hydrogen sulfide and hydrogen is large is solved.

Description

Technical Field

[0001] This application relates to the field of oil and gas pipeline technology, and in particular to a method for testing the permeation of flammable, explosive and harmful gases into full-size non-metallic pipes. Background Technology

[0002] Non-metallic composite pipes, which may include an inner lining made of thermoplastic pipe, are used in oil fields to transport high-pressure gases (such as methane (CH4) and hydrogen sulfide (H2S)), effectively solving the corrosion problem of gathering and transportation pipelines, and their use in oil fields is increasing daily. However, during the transportation of high-pressure gases using non-metallic composite pipes, the permeation of oil and gas media, such as the diffusion of oil and gas media from the inner wall of the lining to the interior, can cause pipeline failure, thereby affecting the normal transportation of oil and gas.

[0003] Currently, the relevant technology CN103674808B proposes to obtain the permeability by measuring pressure change data under sealed vacuum conditions.

[0004] However, due to interference from factors in the real-world measurement environment, the measurement results have significant errors. Therefore, improving the accuracy of the gas permeability coefficient in non-metallic composite pipes is an urgent problem to be solved in order to ensure the normal transportation of oil and gas. Summary of the Invention

[0005] This application provides a method for testing the permeability of flammable, explosive, and harmful gases in full-size non-metallic pipes, which can solve the technical problem of low accuracy of gas permeability coefficient in non-metallic composite pipes.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a method for testing the permeability of flammable, explosive, and hazardous gases in a full-size non-metallic pipe. This method includes: determining a first gas permeability coefficient of a first inner lining membrane when a first gas is at a first temperature; determining a second gas permeability coefficient of the first inner lining membrane when a second gas is at the first temperature; obtaining a first correction coefficient based on the ratio of the second gas permeability coefficient to the first gas permeability coefficient; determining a first gas permeation amount based on a gas permeation test curve of the first inner lining membrane under the first gas condition; determining a second gas permeation amount based on the first gas permeation amount and the slope of the gas permeation test curve; and obtaining a third gas permeability coefficient based on the first correction coefficient and the second gas permeation amount.

[0008] Based on the above description of the method for testing the permeability of flammable, explosive, and hazardous gases in full-size non-metallic tubes provided in this application embodiment, it can be seen that this method involves obtaining the permeability coefficient of the membrane and calculating the reduction factor to ultimately deduce the permeability coefficient of the full-size non-metallic tube, making the entire testing process more efficient. This solves the problem of high risk factors when conducting full-size gas permeation tests with hydrogen sulfide and hydrogen.

[0009] Furthermore, this not only improves the safety and efficiency of testing but also provides a solid foundation for the application of non-metallic tubes in multiple fields, helping to promote technological innovation and development in related industries. It enhances the safety and efficiency of experiments and provides important guidance for the rational selection of non-metallic tubes, resulting in significant social and economic benefits.

[0010] In a feasible implementation of the first aspect, the method for testing the permeation of flammable, explosive, and harmful gases in full-size non-metallic pipes further includes: confirming the fourth gas permeability coefficient of the first inner lining membrane when the first gas is at a second temperature; confirming the fifth gas permeability coefficient of the first inner lining membrane when the second gas is at a second temperature; and obtaining a second correction coefficient based on the ratio of the fifth gas permeability coefficient to the fourth gas permeability coefficient.

[0011] In a feasible implementation of the first aspect, the method for testing the permeation of flammable, explosive, and harmful gases in full-size non-metallic pipes further includes: confirming the sixth gas permeability coefficient of the second inner lining membrane when the first gas is at a first temperature; confirming the seventh gas permeability coefficient of the second inner lining membrane when the second gas is at the first temperature; and obtaining a third correction coefficient based on the ratio of the seventh gas permeability coefficient to the sixth gas permeability coefficient.

[0012] In a feasible implementation of the first aspect, the first inner liner film is polyethylene, the first gas is nitrogen, and the second gas is methane, hydrogen, or hydrogen sulfide.

[0013] By using nitrogen (N2) instead of flammable, explosive, and harmful gases (such as CH4, H2, and H2S) for permeability testing, the risk of gas leakage during the experiment is greatly reduced, thereby protecting the safety of the experimenters and reducing the probability of accidents caused by gas leakage.

[0014] In a feasible implementation of the first aspect, the method for testing the permeation of flammable, explosive, and harmful gases in full-size non-metallic pipes further includes: confirming the eighth gas permeability coefficient of the first inner lining membrane when the first gas is at a first pressure; confirming the ninth gas permeability coefficient of the first inner lining membrane when the second gas is at the first pressure; and obtaining a fourth correction coefficient based on the ratio of the ninth gas permeability coefficient to the eighth gas permeability coefficient.

[0015] By comprehensively considering the effects of temperature and pressure, the gas permeability coefficients of flammable, explosive, and harmful gases in full-size non-metallic composite pipes are clearly defined, providing an accurate basis for the selection of non-metallic pipe materials and their safe application. By using the permeability coefficient of N2 in full-size non-metallic pipes, combined with the gas permeability coefficients of small samples, the permeability coefficients of flammable, explosive, or harmful gases such as CH4, H2, and H2S in full-size non-metallic pipes are obtained. This avoids personnel casualties caused by leaks of flammable, explosive, and harmful gases during the test, simplifies the test procedure, and provides an accurate basis for the selection of non-metallic pipe materials and their safe use.

[0016] In a feasible implementation of the first aspect, the method for testing the permeation of flammable, explosive, and harmful gases in full-size non-metallic pipes further includes: confirming the tenth gas permeability coefficient of the first inner lining membrane when the first gas is at a first humidity level; confirming the eleventh gas permeability coefficient of the first inner lining membrane when the second gas is at a first humidity level; and obtaining a fifth correction coefficient based on the ratio of the eleventh gas permeability coefficient to the tenth gas permeability coefficient.

[0017] In the feasible implementation of the first aspect, the method for testing the permeation of flammable, explosive and harmful gases in full-size non-metallic pipes also includes: obtaining the first gas permeation amount based on the annular volume, pipe surface area, test temperature, pressure difference between the inside and outside of the pipe, standard temperature and standard pressure.

[0018] In one feasible implementation of the first aspect, the method for testing the permeation of flammable, explosive and harmful gases in full-size non-metallic pipes also includes obtaining a second gas permeation rate based on the test temperature and the inner lining wall thickness.

[0019] Secondly, embodiments of this application provide a full-size non-metallic pipe flammable, explosive, and hazardous gas permeation testing system, which includes: at least one processor; a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the method provided in the first aspect.

[0020] The full-size non-metallic tube flammable, explosive, and hazardous gas permeation testing system, by executing the method provided in the first aspect, obtains the permeation coefficient of the membrane and calculates the reduction factor, ultimately deducing the permeation coefficient of the full-size non-metallic tube, making the entire testing process more efficient. Furthermore, it not only improves the safety and efficiency of the test but also provides a solid foundation for the application of non-metallic tubes in multiple fields, contributing to the promotion of technological innovation and development in related industries. It enhances the safety and efficiency of the experiment and provides important guidance for the rational selection of non-metallic tube materials, resulting in significant social and economic benefits.

[0021] Thirdly, embodiments of this application provide a computer-readable medium having computer program instructions stored thereon, which can be executed by a processor to implement the method provided in the first aspect.

[0022] The computer program instructions in the computer-readable medium, by implementing the method provided in the first aspect, obtain the permeability coefficient of the thin film and calculate the reduction factor, ultimately deducing the permeability coefficient of the full-size non-metallic tube, making the entire testing process more efficient. Furthermore, it not only improves the safety and efficiency of the test but also provides a solid foundation for the application of non-metallic tubes in multiple fields, contributing to the promotion of technological innovation and development in related industries. It enhances the safety and efficiency of the experiment and provides important guidance for the rational selection of non-metallic tube materials, resulting in significant social and economic benefits. Attached Figure Description

[0023] Figure 1 A schematic diagram of a full-size non-metallic tube flammable, explosive and harmful gas permeation testing system provided in this application embodiment;

[0024] Figure 2 A schematic flowchart illustrating a method for testing the permeability of flammable, explosive, and harmful gases in a full-size non-metallic pipe, as provided in this application embodiment;

[0025] Figure 3 A schematic diagram of the N2 gas permeation curve of a full-size non-metallic tube provided in an embodiment of this application. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0027] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. Meanwhile, in the embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is being used as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner for ease of understanding.

[0028] The principles and features of this application are described below. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0029] Non-metallic composite pipes can be used in oil fields to transport high-pressure gases, effectively solving the corrosion problem of gathering and transportation pipelines.

[0030] In some embodiments, the non-metallic composite pipe includes an inner lining that is in direct contact with the transported oil or gas. The inner lining of the non-metallic composite pipe can be a thermoplastic pipe. Compared to metal pipes, thermoplastic pipes effectively solve the problem of pipe corrosion.

[0031] Currently, there are many types of thermoplastics that can be used as inner linings, including polyethylene (PE-100), heat-resistant polyethylene (PE-RT), cross-linked polyethylene (PEX), polyvinylidene fluoride (PVDF), and polyketone (POK).

[0032] Thermoplastic pipes do not corrode, leading to their increasing use. However, with prolonged use, pipe failures distinct from corrosion have emerged. Among these, the gas permeability of the inner lining material is the most significant cause of failure. Permeability primarily depends on the physical properties of the thermoplastic (free volume, degree of unsaturation, degree of cross-linking, crystallinity, and substituent type, etc.). The diffusion capacity of small molecule gases is particularly significant and closely related to the material's permeability.

[0033] For example, the oil and gas medium diffuses from the inner wall of the liner into the interior. Due to the effects of swelling and degradation, gas may accumulate. When the accumulation reaches a certain level, bulges will appear.

[0034] For example, gas transported inside a non-metallic composite pipe may permeate into the annulus. The large accumulation of permeated gas in the annulus affects the performance of the reinforcing layer, thereby causing pipe failure. Here, the annulus refers to the annulus within the gas permeation cavity of a full-size non-metallic pipe, which can be the annulus formed by the cavity and the outer wall of the non-metallic pipe.

[0035] This application provides a method for testing the permeability of full-size non-metallic pipes to flammable, explosive, and hazardous gases, applicable to various non-metallic pipe gas transmission and distribution technologies. For example, non-metallic pipes are used in natural gas transmission, chemical pipelines, and other applications involving flammable, explosive, or toxic gases. Considering the test pressure and gas safety in actual operation, an indoor method for testing the gas permeability of full-size pipes to flammable, explosive, and toxic gases is established. This solves the problem of high risk factors when conducting full-size gas permeation tests with hydrogen sulfide and hydrogen.

[0036] This application provides a full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation testing system, which can perform the full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation testing method provided in this application. Figure 1 This is a schematic diagram of a full-size non-metallic tube flammable, explosive and harmful gas permeation testing system provided in an embodiment of this application.

[0037] like Figure 1 As shown, the full-size non-metallic pipe flammable, explosive and harmful gas permeation testing system 001 includes at least one processor 011 and a memory 012 communicatively connected to the at least one processor; wherein, the memory 012 stores instructions that can be executed by the at least one processor 011, and the instructions are executed by the at least one processor 011 to enable the at least one processor 011 to execute the full-size non-metallic pipe flammable, explosive and harmful gas permeation testing method provided in the embodiments of this application.

[0038] Figure 2 This is a schematic flowchart illustrating a method for testing the permeability of flammable, explosive, and hazardous gases to a full-size non-metallic pipe, as provided in an embodiment of this application. Figure 2 As shown, in some embodiments, the method for testing the flammability, explosiveness, and harmful gas permeation of a full-size non-metallic pipe includes the following steps:

[0039] S1, under the condition that the first gas is at a first temperature, confirm the first gas permeability coefficient of the first inner liner membrane.

[0040] The material of the first inner liner film can be of various types, such as polyethylene (PE-100), heat-resistant polyethylene (PE-RT), cross-linked polyethylene (PEX), polyvinylidene fluoride (PVDF), and polyketone (POK).

[0041] The size and shape of the first inner lining film can vary. For example, the thickness can range from 0.5mm to 1.5mm, the diameter can be 100mm, and the shape can be a circular sheet.

[0042] In some embodiments, the first inner liner film is a polyethylene sheet sample, such as PE-100 polyethylene. The first gas is nitrogen.

[0043] In one implementation, a gas permeameter is used to test the first gas permeability coefficient.

[0044] S2, under the condition that the second gas is at the first temperature, confirm the second gas permeability coefficient of the first inner liner membrane.

[0045] In some embodiments, the second gas is methane, hydrogen, or hydrogen sulfide.

[0046] In one implementation, a gas permeameter is used to test the first gas permeability coefficient.

[0047] S3, based on the ratio of the second gas permeability coefficient to the first gas permeability coefficient, the first correction coefficient is obtained.

[0048] In one implementation, at a specific temperature, the gas permeability coefficients of N2, CH4, H2, and H2S in the first inner liner film (i.e., the PE-100 sheet sample) are shown in Table 1. The PE-100 sheet sample has a pressure difference of 0.1 MPa and a thickness of 1 mm.

[0049] Table 1. Test results of gas permeability coefficients for different gases at a certain temperature.

[0050] Gas type <![CDATA[Permeability coefficient [cm 3 ·cm / (cm 2 ·s·Pa)]]]> <![CDATA[N2]]> <![CDATA[1.447×10 -14 ]]> <![CDATA[CH4]]> <![CDATA[4.372×10 -14 ]]> <![CDATA[H2]]> <![CDATA[1.724×10 -13 <!-- 4 -->]]> <![CDATA[H2S]]> <![CDATA[1.896×10 -14 ]]>

[0051] For example, as shown in Table 1, the first gas permeability coefficient of the first gas N2 is P. N2 , PE-100 =1.447×10 - 14 cm 3 ·cm / (cm 2 ·s·Pa). When the second gas is methane, the corresponding second gas permeability coefficient is P. CH4,PE-100 =4.372×10 -14 cm 3 ·cm / (cm 2 Based on the ratio of the second gas permeability coefficient to the first gas permeability coefficient, the first correction coefficient f is... CH4,PE-100 =P CH4,PE-100 / P N2,PE-100 =3.02. When the second gas is H2, the first correction factor f... H2,PE-100 =PH2,PE-100 / P N2,PE-100 =11.91. When the second gas is H2S, the first correction factor f... H2S , PE-100 =P H2S,PE-100 / P N2,PE-100 =1.31.

[0052] S4. Based on the gas permeation test curve of the first inner liner membrane under the first gas condition, confirm the amount of first gas permeation.

[0053] In some embodiments, with nitrogen as the first gas, a permeation test is conducted on a full-size PE-100 lined composite pipe under N2 conditions to obtain the following results: Figure 3 The gas permeation test curve is shown at a first temperature. For example, the first temperature can be ambient temperature, such as 23°C. The OA segment represents the settling period of the pipe, lasting 24 hours. Gas adsorbed on the outer wall of the pipe desorbs, eliminating the influence of adsorbed gas on the gas permeation test. The AB segment represents the process of gas molecules adsorbing, dissolving, diffusing, and desorbing in the pipe matrix and gradually reaching equilibrium, lasting 168 hours. The BC segment represents the stable permeation stage after gas permeation equilibrium is established, lasting 168 hours. Because the permeation rate remains constant, the slope of the curve remains unchanged.

[0054] In some embodiments, the method for testing the permeation of flammable, explosive and harmful gases in full-size non-metallic pipes further includes: obtaining a first gas permeation rate based on the annular volume, pipe surface area, test temperature, pressure difference between the inside and outside of the pipe, standard temperature and standard pressure.

[0055] First gas permeation Q N2 The calculation formulas include:

[0056] Q N2 =(△p / △t)×(V / S)×(T0 / p0T)×[24 / (p1-p1)];

[0057] Where △p / △t represents the arithmetic mean of the gas pressure change per unit time, the slope of the gas permeation test curve, and the unit is Pa / h; V represents the volume of the permeation chamber, and the unit is cm³. 3 S represents the inner surface area of ​​the pipe, in meters (m²). 2 T represents the test temperature in Kelvin (K); T0 represents the standard temperature, with a value of 273.15 K; p0 represents the standard pressure, with a value of 1.0133 × 10⁻⁶. 5 Pa; p1-p1 represents the test pressure difference, in Pa.

[0058] Where △p / △t is the arithmetic mean of the gas pressure change per unit time, which is equivalent to the slope of the gas permeation test curve.

[0059] For example, Δp / Δt is 75 Pa / h. The permeation chamber volume V = 800 cm³. 3 The inner surface area of ​​the pipe is S = 0.4 m². 2 Test temperature T = 300.15 K. Test pressure difference P1 - P2 = 8 × 10⁻⁶ 5 Pa. Standard temperature T0 = 273.15 K. Standard pressure p0 = 1.0133 × 10 Pa. 5 Pa. Therefore, according to the above calculation formula, the value of the first gas permeation is Q. N2,PE-100 =4.04×10 -5 cm 3 / (m 2 ·d·Pa).

[0060] S5. Based on the first gas permeation rate and the slope of the gas permeation test curve, confirm the second gas permeation rate.

[0061] In some embodiments, the gas permeation test curve obtained from the permeation test of the PE-100 lined full-size composite pipe under N2 conditions is used to obtain the second gas permeation amount at the corresponding temperature.

[0062] In some embodiments, the method for testing the permeation of flammable, explosive and harmful gases in full-size non-metallic pipes further includes: obtaining a second gas permeation rate based on the test temperature and the inner lining wall thickness.

[0063] In some embodiments, the formula for calculating the second gas permeation amount includes:

[0064] P' N2 =(△p / △t)×(V / S)×(T0 / p0T)×[e / (p1-p1)]=1.1574×10 -9 Q N2 ×e;

[0065] Among them, Q N2 The value is expressed as the first gas permeation rate, and e represents the inner lining wall thickness, in cm.

[0066] For example, Q N2,PE-100 =4.04×10 -5 cm 3 / (m 2 The inner lining wall thickness (also known as the pipe wall thickness) is 0.5 cm. Therefore, according to the above calculation formula, the value of the second gas permeation is P'. N2,PE-100 =1.1574×10 - 9 QN2,PE-100 ×e=2.34×10 -14 cm 3 ·cm / (cm 2 ·s·Pa).

[0067] S6. Based on the first correction factor and the second gas permeability, the third gas permeability coefficient is obtained.

[0068] In some embodiments, when the second gas is CH4, the permeation correction factor f of CH4 in the thermoplastic PE-100 is used. CH4,PE-100 =3.02, P' N2,PE-100 =2.34×10 -14 cm 3 ·cm / (cm 2 ·s·Pa), to obtain the third gas permeability coefficient P' corresponding to CH4. CH4,PE-100 =f CH4,PE-100 ×P' N2,PE-100 =3.02×P' N2,PE-100 =7.07×10 -14 cm 3 ·cm / (cm 2 ·s·Pa).

[0069] Similarly, when the second gas is H2, based on the H2 permeation correction factor f in the thermoplastic PE-100... H2,PE-100 =11.91. Third gas permeability coefficient P' H2,PE-100 =f H2,PE-100 ×P' N2,PE-100 =11.91×P' N2,PE-100 =2.79×10 -13 cm 3 ·cm / (cm 2 ·s·Pa).

[0070] Similarly, when the second gas is H2S, based on the H2S permeation correction factor f in the thermoplastic PE-100... H2S,PE-100 =1.31. Third gas permeability coefficient P' H2S,PE-100 =f H2S,PE-100 ×P' N2,PE-100 =1.31×P' N2,PE-100 =3.07×10 -14 cm 3 ·cm / (cm 2 ·s·Pa).

[0071] This application's embodiments obtain the permeability coefficient of the thin film and calculate the reduction factor, ultimately deducing the permeability coefficient of the full-size non-metallic tube, making the entire testing process more efficient. Furthermore, it not only improves the safety and efficiency of the test but also provides a solid foundation for the application of non-metallic tubes in multiple fields, contributing to the promotion of technological innovation and development in related industries. It enhances the safety and efficiency of the experiment and provides important guidance for the rational selection of non-metallic tube materials, resulting in significant social and economic benefits.

[0072] In some embodiments, the method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes further includes:

[0073] S71, under the condition that the first gas is at the second temperature, confirm the fourth gas permeability coefficient of the first inner liner membrane.

[0074] S72, under the condition that the second gas is at the second temperature, confirm the fifth gas permeability coefficient of the first inner liner membrane.

[0075] S73, based on the ratio of the fifth gas permeability coefficient to the fourth gas permeability coefficient, the second correction coefficient is obtained.

[0076] In some embodiments, after performing step S73, the second gas permeation amount can be obtained by referring to steps S4 and S5, and then the target permeation coefficient corresponding to the second temperature can be obtained based on the second correction coefficient and the second gas permeation amount.

[0077] In this way, by measuring the second correction factor corresponding to different temperatures, a comprehensive database of flammable, explosive, and harmful gas permeation tests for full-size non-metallic pipes can be established to ensure application in various scenarios.

[0078] In some situations, besides temperature, other influencing factors exist, such as different inner lining films. In some embodiments, the method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes further includes:

[0079] S81, under the condition that the first gas is at the first temperature, confirm the sixth gas permeability coefficient of the second inner liner membrane.

[0080] S82, under the condition that the second gas is at the first temperature, confirm the seventh gas permeability coefficient of the second inner liner membrane.

[0081] S83, based on the ratio of the seventh gas permeability coefficient to the sixth gas permeability coefficient, yields the third correction coefficient.

[0082] In some embodiments, after performing step S83, the second gas permeation amount can be obtained by referring to steps S4 and S5, and then the target permeation coefficient of the second liner film at the first temperature can be obtained based on the third correction coefficient and the second gas permeation amount.

[0083] In some situations, in addition to temperature, other influencing factors, such as different pressures, may occur. In some embodiments, the method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes further includes:

[0084] S91, under the condition that the first gas is at the first pressure, the eighth gas permeability coefficient of the first inner liner membrane is confirmed.

[0085] S92, under the condition that the second gas is at the first pressure, confirm the ninth gas permeability coefficient of the first inner liner membrane.

[0086] S93, based on the ratio of the ninth gas permeability coefficient to the eighth gas permeability coefficient, yields the fourth correction coefficient.

[0087] In some embodiments, after performing step S93, the second gas permeation amount can be obtained by referring to steps S4 and S5, and then the target permeation coefficient of the second gas under the first pressure can be obtained according to the fourth correction coefficient and the second gas permeation amount.

[0088] In some situations, besides temperature, other influencing factors include varying humidity levels. In some embodiments, the method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes further includes:

[0089] S101, under the condition that the first gas is at the first humidity, confirm the tenth gas permeability coefficient of the first inner liner film.

[0090] S102, under the condition that the second gas is at the first humidity, confirm the eleventh gas permeability coefficient of the first inner liner film.

[0091] S103, based on the ratio of the eleventh gas permeability coefficient to the tenth gas permeability coefficient, yields the fifth correction coefficient.

[0092] In some embodiments, after performing step S103, the second gas permeation amount can be obtained by referring to steps S4 and S5, and then the target permeation coefficient of the second gas under the first humidity can be obtained according to the fourth correction coefficient and the second gas permeation amount.

[0093] The above comprehensive consideration of factors such as temperature, pressure, and humidity makes the results more accurate.

[0094] This application, through obtaining the permeability coefficients of N2, CH4, H2, and H2S for thin film samples of different types of non-metallic materials under the same test conditions, yields the gas permeability reduction coefficients for flammable, explosive, and harmful gases such as N2, CH4, H2, and H2S in different types of non-metallic materials. By combining the permeability coefficient of N2 in a full-size non-metallic tube with the gas permeability coefficient of a small sample, the permeability coefficients of flammable, explosive, or harmful gases such as CH4, H2, and H2S in a full-size non-metallic tube are obtained. This avoids personnel casualties caused by leakage of flammable, explosive, and harmful gases during the test, simplifies the test procedure, and provides an accurate basis for the selection and safe use of non-metallic tubes.

[0095] This application embodiment uses nitrogen (N2) instead of flammable, explosive, and harmful gases (such as CH4, H2, H2S) for permeability testing, greatly reducing the risk of gas leakage during the experiment, thereby protecting the safety of experimental personnel and reducing the probability of accidents caused by gas leakage. It solves the problem of the high risk factor when using hydrogen sulfide and hydrogen in full-scale gas permeability tests.

[0096] The test method used in this application simplifies the testing process. By obtaining the permeability coefficient of the thin film sample and calculating the reduction factor, the permeability coefficient of the full-size non-metallic tube can be finally calculated, making the entire testing process more efficient.

[0097] This application provides a reliable scientific basis for the selection of non-metallic pipes by obtaining the permeation characteristics of flammable, explosive and harmful gases (such as CH4, H2, H2S) in full-size non-metallic pipes, ensuring their safety and reliability in use.

[0098] The embodiments of this application avoid the direct emission of flammable, explosive and harmful gases, thereby reducing environmental pollution.

[0099] The embodiments of this application not only improve the safety and efficiency of testing, but also provide a solid foundation for the application of non-metallic tubes in multiple fields, which helps to promote technological innovation and development in related industries.

[0100] Through these beneficial effects, the embodiments of this application not only improve the safety and efficiency of the experiment, but also provide an important basis for the rational selection of non-metallic tubes, which has significant social and economic benefits.

[0101] Based on the same concept, this application also provides a full-size non-metallic pipe flammable, explosive, and hazardous gas permeation testing system. The method corresponding to this system can be the same as the method described in the foregoing embodiments, and its problem-solving principle is similar. The full-size non-metallic pipe flammable, explosive, and hazardous gas permeation testing system provided in this application includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform the methods and / or technical solutions of the various embodiments of this application.

[0102] Another embodiment of this application provides a computer-readable storage medium having computer program instructions stored thereon, which can be executed by a processor to implement the methods and / or technical solutions of any one or more embodiments of this application described above.

[0103] Specifically, this embodiment may employ any combination of one or more computer-readable media. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0104] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0105] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0106] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0107] The flowcharts or block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of devices, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-specific system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0108] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0109] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or page components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0110] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0111] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0112] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0114] Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices recited in a device claim may also be implemented by a single unit or device through software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any specific order.

Claims

1. A full-scale non-metallic pipe flammable, explosive and harmful gas permeation test method, characterized in that, include: With the first gas at a first temperature, the first gas permeability coefficient of the first inner liner membrane is determined; With the second gas at the first temperature, the second gas permeability coefficient of the first inner liner membrane is determined; based on the ratio of the second gas permeability coefficient to the first gas permeability coefficient, a first correction coefficient is obtained; Based on the gas permeation test curve of the first inner liner film under the first gas, the first gas permeation amount is determined; based on the first gas permeation amount and the slope of the gas permeation test curve, the second gas permeation amount is determined. The third gas permeability coefficient is obtained based on the first correction coefficient and the second gas permeability.

2. The full-scale non-metallic pipe flammable, combustible, and hazardous gas permeation test method according to claim 1, characterized by, The full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation test method also includes: With the first gas at a second temperature, the fourth gas permeability coefficient of the first inner liner film is determined; with the second gas at a second temperature, the fifth gas permeability coefficient of the first inner liner film is determined; based on the ratio of the fifth gas permeability coefficient to the fourth gas permeability coefficient, a second correction coefficient is obtained.

3. The method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes according to claim 1 or 2, characterized in that, The full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation test method also includes: With the first gas at a first temperature, the sixth gas permeability coefficient of the second inner liner membrane is determined; with the second gas at a first temperature, the seventh gas permeability coefficient of the second inner liner membrane is determined; based on the ratio of the seventh gas permeability coefficient to the sixth gas permeability coefficient, a third correction coefficient is obtained.

4. The method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes according to claim 1 or 2, characterized in that, The first inner liner film is polyethylene, the first gas is nitrogen, and the second gas is methane, hydrogen, or hydrogen sulfide.

5. The method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes according to claim 1 or 2, characterized in that, The full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation test method also includes: With the first gas at a first pressure, the eighth gas permeability coefficient of the first inner liner film is determined; with the second gas at a first pressure, the ninth gas permeability coefficient of the first inner liner film is determined; based on the ratio of the ninth gas permeability coefficient to the eighth gas permeability coefficient, a fourth correction coefficient is obtained.

6. The method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes according to claim 1 or 2, characterized in that, The full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation test method also includes: When the first gas is at a first humidity level, the tenth gas permeability coefficient of the first inner liner film is determined; when the second gas is at a first humidity level, the eleventh gas permeability coefficient of the first inner liner film is determined; based on the ratio of the eleventh gas permeability coefficient to the tenth gas permeability coefficient, a fifth correction coefficient is obtained.

7. The method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes according to claim 1 or 2, characterized in that, The full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation test method also includes: The first gas permeation rate is obtained based on the annular volume, pipe surface area, test temperature, pressure difference between the inside and outside of the pipe, standard temperature, and standard pressure.

8. The method for testing the flammability, explosiveness, and harmful gas permeation of full-size non-metallic pipes according to claim 1 or 2, characterized in that, The full-size non-metallic pipe flammability, explosiveness, and harmful gas permeation test method also includes: The second gas permeation rate was obtained based on the test temperature and the inner lining wall thickness.

9. A full-size non-metallic pipe flammable, explosive, and harmful gas permeation testing system, characterized in that, include: At least one processor; A memory that is communicatively connected to the at least one processor; The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 8.

10. A computer-readable medium having stored thereon computer program instructions that can be executed by a processor to implement the method as described in any one of claims 1 to 8.

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