CN112699530A - BIM-based pipeline pressure test method - Google Patents
BIM-based pipeline pressure test method Download PDFInfo
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Abstract
A BIM-based pipeline pressure test method comprises the following steps: completing pipeline modeling in simulation software according to a design drawing to obtain a pipeline model; performing collision inspection and three-dimensional inspection based on a BIM technology on the pipeline model; selecting a pressure test medium and pressure to set a pipeline model; selecting a test pipeline region from the pipeline model, and manufacturing the test pipeline region into a pressure test packet; when the pipeline model reaches the test pressure, the volumes of all parts in the pressure test pack are led out, and the sum of the volumes is calculated; the total volume is substituted into a pipeline energy storage calculation formula, the explosion energy value of the test pipeline area in the pressure test pack is calculated, and the construction safety in the test pipeline area is calculated by using the value.
Description
Technical Field
The invention relates to the technical field of process pipeline pressure testing.
Background
At present, the construction of domestic chemical engineering projects is rapidly developed, and in order to ensure that a process pipeline can be normally operated after being handed over, after the pipeline is installed, a corresponding pressure test medium needs to be selected according to the requirements of design files to perform pressure tests on the pipeline.
As an extremely important component of a large LNG (liquefied Natural gas) storage tank, the LNG storage tank process pipeline has the characteristics of large pipe diameter, complex system, numerous welded junctions and valves, high process requirement and the like, the design pressure is between 1.1MPa and 1.85MPa, a part of pipelines transport low-temperature media after operation, the design temperature is-165 ℃, and numerous valves are arranged. Therefore, for the part of pipelines, a gas pressure test mode is generally adopted, residual moisture caused by water pressure is prevented, the pipelines and valves are frozen after precooling, and meanwhile, the safety of the air pressure also becomes another key point of the pressure test work. The pressure test comprises the following specific steps: before testing, the communication condition and the whole trend of the pipeline are known, and the communication condition and the whole trend are searched by contrasting a design axis map and a flow chart, and various parameter attributes of the pipeline system are collected; carding information such as the number and the type of all components in a process pipeline system; compiling a pressure test scheme, calculating pressure test parameters, selecting pressure test equipment, designing a pressure test auxiliary tool and the like; and (4) carrying out a process pipeline pressure test after the scheme is audited, and verifying the installation quality of the process pipeline system.
Through analyzing the concrete steps of the pressure test and the existing construction scheme, the pressure test of the existing pipeline has the following problems on the traditional working process, firstly, in order to clearly know the communication condition and the whole trend of the pipeline, the pressure test needs to be repeatedly searched by contrasting a design axonometric drawing and a flow chart, in a pipeline system with various information, the condition of error and leakage is inevitable, a construction unit cannot determine whether a design problem exists only through an axonometric drawing and a flow chart, in the installation stage, the pressure test preparation stage and after the pressure test is finished, the pipeline which is finished on site can be modified, and meanwhile, for the pressure test system with larger engineering quantity and more pressure test loops, the corresponding pressure test flow chart is correspondingly complex, and in the scheme auditing and construction stages, the flow chart needs to spend more time for owners, supervisors and constructors to be familiar and mastered, so that the time cost is higher; secondly, data collected by the traditional method are prone to errors, and the stored energy of the pressure test pack cannot be rapidly and accurately calculated, so that the safety and reliability of the test are difficult to effectively verify.
Disclosure of Invention
The invention aims to provide a BIM (building Information modeling) -based pipeline pressure test method, which provides reliable technical guidance for pipeline pressure test.
The pipeline pressure testing method for achieving the purpose comprises the following steps: completing pipeline modeling in simulation software according to a design drawing to obtain a pipeline model; performing collision inspection and three-dimensional inspection based on a BIM technology on the pipeline model; selecting a pressure test medium and pressure to set the pipeline model; selecting a test pipeline region from the pipeline model, and making the test pipeline region into a pressure test packet; when the pipeline model reaches the test pressure, the volumes of all parts in the pressure test package are led out, and the sum of the volumes is calculated; and finally substituting the volume sum into a pipeline energy storage calculation formula, calculating an explosion energy value of a test pipeline region in the pressure test pack, and calculating the construction safety in the test pipeline region by using the value.
The pipeline energy storage calculation formula is as follows:
E＝2.5PatV[1-(Pa/Pat)0.286]
wherein E is stored energy, PaIs absolute atmospheric pressure, PatTo test absolute pressure, V is the sum of the volumes at the test pressure.
After a pressure test package is obtained, all safety valves are temporarily dismantled, a temporary blind plate model is added for plugging, and the number of temporary blind plates, bolts and gaskets is calculated through a BIM technology.
Selecting a pressure measuring port, a water filling port, an exhaust port and a water outlet which are suitable in the pressure test bag, establishing valves and blind plates required by each temporary port, and calculating the number of the valves and the number of the blind plates according to a BIM technology
The simulation software is Bentley software, and the pipeline pressure test method is completed.
The test medium is gas, and the test pressure is 1.15 times of the design pressure of the pipeline.
The three-dimensional pipeline model is established in simulation software according to the design drawing, the pipeline structure can be clearly displayed, a visual solution is provided for the partition work of the pipeline pressure test package, and engineering personnel do not need to repeatedly search a design axis drawing and a flow chart, so that the time cost is saved; meanwhile, the BIM can be used for rapidly and accurately extracting the energy storage volume in the pipeline region to be tested in the pressure test pack, the pipeline energy storage can be accurately calculated according to the extracted energy storage volume, the explosion energy value of the test pipeline region in the pressure test pack is obtained, errors caused by manual calculation are effectively avoided, and technical guidance is provided for the safety and reliability of pressure test.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a pipeline pressure test method based on BIM technology.
Detailed Description
The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.
As shown in fig. 1, a pipeline pressure testing method based on the BIM technology first performs step 11, and completes pipeline modeling in simulation software according to a design drawing to obtain a pipeline model. According to civil engineering, steel structure deepening drawings and pipeline axonometric diagrams, the pipeline modeling work is completed based on a Bentley software pipeline platform, and the Bentley software can clearly and completely display a complex pipeline system. Preferably, the model precision in the modeling process is LOD300 precision, which can embody precise size, shape and positioning, accurate component, material and model information in the model, and has better accuracy.
According to drawings and actual working conditions, the accurate positions and sizes of various process pipelines, pipe fittings, valves, online components and pipeline supports are determined, meanwhile, non-geometric data such as pipeline information including system numbers, pipeline grades, pipeline media, design pressure, design temperature, PID (proportion integration differentiation) diagram numbers, heat preservation requirements, gradients and medium flow directions and support information such as support numbers, material information, heat preservation pipe support models and the like are selected from the established pipeline models. After all the non-geometric information and geometric data are determined, a three-dimensional pipeline model is preliminarily constructed by utilizing Bentley software, the pipeline model comprises the size, the shape, the material and the positioning of each part, the complex working flow of continuously browsing drawings and searching information in the traditional mode is omitted, and the working time is greatly saved.
After the preliminary completion of the pipeline model, step 12 is performed, and collision check and three-dimensional review are performed based on the BIM to obtain a "zero-collision" BIM model. The pipeline model established in step 11 is a preview of professional construction of the whole pipeline system, structure and the like, and the pipeline model designed according to the drawing cannot ensure practical operability, so that collision check and three-dimensional inspection need to be performed on the pipeline model, and a large number of problems hidden in design, such as collision problems and unreasonable arrangement problems of pipelines in the design drawing, can be found in the process. By linking the professional three-dimensional models and combining the functions of the Bentley platform, such as three-dimensional view, simulation roaming and the like, the pipeline model established in the step 11 is subjected to three-dimensional verification, the problems that the space is insufficient and the space does not meet the standard specification and the like in future construction are timely recorded and eliminated, and the net height of the pipeline is optimized and adjusted.
After the road model is subjected to three-dimensional calibration, performing collision check on the structure, civil engineering and electromechanical professions respectively once to generate a first collision check report, feeding back a collision result and a modification suggestion to corresponding designers in combination with the three-dimensional inspection suggestion, and adjusting and modifying related parameters by the designers based on the collision model until the final collision check result is zero to obtain a 'zero-collision' BIM model in the profession and obtain a pipeline arrangement scheme with actual operability.
And integrating the 'zero-collision' BIM models adjusted by each specialty, performing one-time collision check of multiple specialties to form a collision check report between the specialties, feeding back corresponding designers, adjusting, and finally obtaining the 'zero-collision' comprehensive model. Through collision inspection and three-dimensional examination by using the BIM technology, the problems in design can be found in advance, zero collision is realized before the pipeline pressure test work, and guiding significance is provided for practical operation. By utilizing the drawing function of the Bentley software platform and the three-dimensional visualization technology of the BIM technology, the efficiency and the accuracy of the pressure test scheme in examination, transaction and execution are improved, meanwhile, the design problem is found and solved in advance in the early stage of construction, and the rework, the cost and the construction period loss are effectively avoided.
And (3) after a 'zero-collision' comprehensive model is obtained and the pipeline model is guaranteed to have no design defects, performing step 13, selecting a pipeline pressure test medium and pressure test pressure, and setting the 'zero-collision' comprehensive model.
In the embodiments described herein, when testing the process pipeline of the LNG storage tank, the process pipeline is used to transport cryogenic medium or other medium that is greatly affected by moisture, and there are many valves in such pipeline, and moisture is not easily removed, so that gas is selected as the test medium, and the test pressure of the gas is 1.15 times of the design pressure of the pipeline.
In other embodiments, the process pipeline is tested by hydrostatic testing, clear water can be selected as a testing medium, and the hydrostatic testing pressure is 1.5 times of the design pressure of the pipeline according to relevant standard standards.
After the pressure testing medium and the pressure testing pressure are set in the comprehensive model, step 14 is performed, a testing pipeline region is selected from the comprehensive model, and the pipeline region to be tested is made into a pressure testing bag. And (3) utilizing the complete BIM model to manufacture a pressure test package for the selected test pipeline region to obtain a three-dimensional model of the region to be tested, and clearly and accurately recording data such as the trend, the position, the medium flow direction, the communication condition with other pipelines and the like of the pipeline in the test pipeline region in the pressure test package. In the comprehensive model, a plurality of test pipeline regions can be selected, the test pipeline regions are respectively made into different pressure test packets, and each pressure test packet contains pipeline data in the pipeline region to be tested. And (4) independently measuring and calculating each pressure test pack to calculate the pipeline energy storage in the test pipeline region in each pressure test pack and evaluate the pressure safety of the to-be-tested pipeline region.
According to the process requirements during actual pressure testing, partial valves need to be installed in a delayed mode to serve as reserved welding openings, the valves are installed after the pressure testing is completed, the bit numbers, the pressure levels and the position information of the valves can be easily inquired through the pressure testing package established by the BIM model, and the information is marked in a flow chart to guide reservation of on-site teams and groups.
When pressure measurement is carried out, all safety valves in the pipeline need to be temporarily removed, and a blind plate is used for plugging. And deriving the position numbers of all safety valves and the information of the pipelines in the model of the to-be-tested pipeline region contained in the pressure test package, and adding a temporary blind plate model in the model. After the model is dismantled, the number of temporary blind plates, bolts and gaskets can be counted through the accurate calculation amount of the BIM technology so as to guide workers to purchase.
According to the principle of high-point exhaust and low-point drainage, a pressure measuring port, a water injection port or a pressure measuring port, an exhaust port and a water discharge port which are suitable are selected according to the elevation and the size in a pipeline region to be tested contained in a pressure test bag, a valve and blind plate part model required by each temporary port is built in the pressure test bag, the material quantity is derived according to the BIM technical calculation function, and the method can be used for guiding a worker to purchase.
By applying the calculation function of the BIM technology, accurate purchase quantity can be obtained in the quantity statistics of the temporary pipe fittings, the material can be ensured to be available at one time in the practical process, accurate purchase is realized, and the labor cost of purchasing personnel can be saved.
By combining the three-dimensional visualization advantages of the BIM technology, temporary ports, valves needing to be removed, added temporary blind plate positions, pipeline positions and the like are marked in the model of each pressure test pack, the traditional pressure test flow chart is converted into a three-dimensional visualization drawing, and visualization support is provided when a main side and a supervisor side review a construction scheme; meanwhile, the number of required parts can be calculated, and purchasing personnel are facilitated; when the construction is handed over to teams and groups, the construction efficiency can be greatly improved.
And (3) carrying out the steps 15 and 16 when the test pipeline region in the pressure test package reaches the test pressure, deriving the volume of each component in the pressure test package, calculating the volume sum, substituting the volume sum into a pipeline energy storage calculation formula, calculating the explosion energy value of the test pipeline region, and calculating the construction safety in the test pipeline region by using the value.
According to ASME PCC-2-2018 mandatory appendix 501-II formula II-2, the pipeline energy storage calculation formula is:
E＝2.5PatV[1-(Pa/Pat)0.286]
wherein E is stored energy, PaIs absolute atmospheric pressure, PatTo test absolute pressure, V is the sum of volumes at the test pressure, i.e., the sum of volumes obtained by step 15. By means of the BIM technology, the volume attribute can be conveniently and quickly led out for the model of each pressure test pack, the total volume of online components such as pipelines, pipe fittings and valves in the pressure test pack is collected, and the total volume V is obtained. The BIM technology provides powerful support for accurately calculating the energy storage volume of the pressure test pack, rapid and accurate statistics can be carried out on 0.75-40-inch pipelines, pipe fittings or valves, and the like, and technical basis is provided for the safety and reliability of pressure test.
After the energy storage numerical value of the to-be-tested pipeline region contained in the pressure test pack is obtained, the pressure test pack is used for accounting construction safety, determining a test isolation range, providing reference and guidance for pipeline pressure test construction of subsequent large-scale chemical projects, and ensuring safety and reliability of a production process.
Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.
Claims (6)
1. A BIM-based pipeline pressure test method is characterized by comprising the following steps:
completing pipeline modeling in simulation software according to a design drawing to obtain a pipeline model;
carrying out three-dimensional checking and collision inspection on the pipeline model based on BIM to obtain a zero-collision comprehensive model;
selecting a pipeline pressure test medium and pressure test pressure, and setting the comprehensive model;
selecting a test pipeline region from the comprehensive model, and making the test pipeline region into a pressure test packet;
when the test pipeline region reaches the test pressure, the volume of each component in the pressure test pack is led out, and the sum of the volumes is calculated;
and substituting the volume sum into a pipeline energy storage calculation formula, calculating an explosion energy value of a test pipeline region in the pressure test pack, and calculating the construction safety in the test pipeline region by using the value.
2. The pipeline pressure testing method according to claim 1, wherein the pipeline energy storage calculation formula is as follows:
E＝2.5PatV[1-(Pa/Pat)0.286]
wherein E is stored energy, PaIs absolute atmospheric pressure, PatTo test absolute pressure, V is the sum of the volumes at the test pressure.
3. The pipeline pressure testing method according to claim 1, wherein after the pressure testing package is obtained, all safety valves are temporarily dismantled, a temporary blind plate model is added for plugging, and the number of temporary blind plates, bolts and gaskets is calculated by means of a BIM (building information modeling) technology.
4. The method for testing pressure of pipelines according to claim 1, wherein a pressure measuring port, a water filling port, an air exhaust port and a water discharge port are selected from the test package, valves and blind plates required by each temporary port are established, and the number of the valves and the blind plates is calculated by means of BIM technology.
5. The pipeline pressure testing method as claimed in claim 1, wherein the simulation software is Bentley software, and the pipeline pressure testing method is completed.
6. The method for testing pressure of a pipeline as claimed in claim 1, wherein the test medium is a gas, and the test pressure is 1.15 times of the design pressure of the pipeline.
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| CN109163981A (en) * | 2018-11-01 | 2019-01-08 | 中国石油大学(北京) | Condition monitoring and reliability analysis system and method for pipeline pressure test |
| CN109520852A (en) * | 2018-12-17 | 2019-03-26 | 陕西化建工程有限责任公司 | A kind of DCC device ultra-large volume regenerator gas pressure test system and method |
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