general provisions
The purpose of this specification is set forth in Clause 1.0.1. This specification is a unified technical regulation for the installation requirements of refrigeration equipment and air separation equipment to ensure the installation quality and safe operation of the equipment, and will constantly improve the project quality and promote the continuous development of installation technology.
Article 1.0.2 the scope of application of this specification is the installation of national approved refrigeration equipment and air separation equipment. Since the installation of refrigeration equipment and air separation equipment has different characteristics from other mechanical equipment installation, the installation in this specification is from the unpacking of equipment to the acceptance of the qualified project for trial operation. During the trial operation, it is difficult to separate or separate the air (water) as the medium and other media, normal temperature and high and low temperature, single machine air load, load and complete load, etc . Therefore, for refrigeration equipment, installation unit is generally responsible for filling and filling the system to make refrigerant, and cooperating with the construction unit to conduct system load trial operation. The system will be tested to reduce to the design temperature in the minimum heat load condition, without assessing other technical indicators belonging to equipment performance or process design. For air separation equipment, the installation unit is responsible for the system naked cooling test, while the whole set of system commissioning is conducted with the construction unit. After the system condition is stable, the parameters are continuously measured for 4 hours. As for the test run of single machine under the medium of air load, air or water, the installation unit shall be responsible for the installation and the construction unit shall participate in the commissioning; while other media under high temperature or low temperature shall be conducted by the construction unit and the installation unit shall participate in the commissioning. The installation unit shall be responsible for handling the quality problems caused by the installation reasons in the trial operation of single machine or complete equipment; even if the problems caused by installation are found through the handover acceptance procedures, the installation unit shall be responsible for handling the problems. During the trial operation, the power, equipment, oil, materials (medium) involved are provided by the construction unit. The above situation has been formed in China for many years. With the deepening of China's reform and opening up, the system and management of all walks of life are also constantly reforming and innovating. Therefore, the trial operation can also be decided by the installation unit and the construction unit through negotiation on the contract. Article 1.0.3 construction according to design is the basic requirement of installation site construction. The installation pipeline system of refrigeration and air separation equipment is complex and the process flow is strict, so the importance of the system is emphasized. Article 1.0.4 the general technical requirements involved in the construction of refrigeration equipment and air separation equipment installation project, such as construction preparation, equipment setting out, setting out and leveling, anchor bolts, pad iron, grouting and assembly, etc., have been specified in the current national standards (general code for construction and acceptance of mechanical equipment installation engineering), and this specification is no longer repeated. When other projects and auxiliary equipment, devices and components are involved in the installation of refrigeration equipment and air separation equipment, there are corresponding national current standards, such as: Code for construction and acceptance of reinforced concrete engineering, code for construction and acceptance of steel structure engineering, code for construction and acceptance of welding engineering of field equipment and industrial pipelines, and industrial industry The specification for construction and acceptance of pipeline engineering, code for construction and acceptance of industrial equipment and pipeline insulation engineering, code for construction and acceptance of electrical installation engineering, and code for construction and acceptance of industrial automation instrument engineering are not repeated in this specification.

Chapter II refrigeration equipment
Section I General Provisions
Article 2.1.1 the installation works of the refrigeration equipment in this specification include: compression refrigeration equipment with piston type, screw type and centrifugal refrigeration compressor as the main engine, potassium bromide absorption refrigeration unit and combined refrigeration room. It does not include steam jet type, ammonia water absorption refrigeration equipment. For refrigerant, piston type equipment mainly uses R717, R22, R502, R12, and screw type equipment mainly uses R717 and R22. R12, the centrifugal equipment mainly uses R717, R12 and RLL; the installation of refrigeration equipment using other refrigerants can be implemented according to the relevant provisions of this specification.
Article 2.1.2 when the refrigeration unit or compressor unit needs to be disassembled if it exceeds the warranty period of rust prevention or has obvious defects, the degree of disassembly shall be determined according to the inspection; the disassembly sequence and cleaning method shall be required in the technical documents of the equipment and shall be carried out according to its requirements.
Article 2.1.3 in this specification, the refrigeration unit refers to the complete refrigeration system in the factory, and the main engine, attached machine and other equipment are basically the refrigeration devices on the same common base. The products mainly include large and medium-sized air conditioners, chillers, brine units, etc. This article is the general requirements of the installation procedure of the refrigeration unit. See other sections of this specification for specific provisions.
Article 2.1.4 refrigerant ammonia has corrosion effect on copper and copper alloy, except phosphorus bronze. In order to prevent the potential accident caused by material confusion during installation, it is not specified in the article. Other refrigerants have no corrosion effect on copper and copper alloy, and can be used in installation. When using aluminum as sealing material, it is required to use high purity aluminum, which means aluminum with low magnesium content and other impurities, which is not easy to break and does not affect sealing performance.
Article 2.1.5 the valves and instruments used in the installation of refrigeration equipment must meet the requirements of corresponding media, that is, special valves and instruments which do not corrode the refrigerant must be used. Therefore, during the installation of equipment, inspection and verification shall be carried out to avoid potential accidents. The sealing materials listed in the article have been widely used for many years of practice, and they are mainly used in lubricating oil and refrigerant pipelines, and other rubber asbestos plates can be used in general pipelines.
Article 2.1.6 the welding process of the bottom cover and cover of arc welding can effectively improve the quality of the weld. According to the relevant national standards, the welds of the refrigerant pipeline shall be inspected by ray inspection. In addition, the permeability of refrigerant is relatively strong and the air tightness of refrigeration system is very high. Using this welding process can improve the qualification rate of weld detection, and effectively ensure the gas tightness of the weld, and there is no welding slag inside the pipeline after welding. The oxide scale is present and is relatively clean. It is proved that the effect is very good by many units, so it is recommended in the article. The nitrogen arc welding here refers to tungsten or other metal arc welding.
Article 2.1.7 due to the harmful effect of Freon on the ozone layer of the earth's atmosphere, domestic manufacturers will gradually reduce the production of freon refrigeration products in the future. In construction, in order to prevent environmental pollution, we should try not to discharge freon gas to the atmosphere. Although the above is common sense, it is specially included as a provision to attract people's attention.
Section 2 piston refrigeration compressor and compressor unit
Article 2.2.1 in this specification, a single compressor refers to a compressor without a common base and not connected with the motor when it leaves the factory; a compressor unit refers to a unit in which the compressor, motor and other accessories are on the same base and do not form a complete refrigeration system when it leaves the factory, including a compressor condensing unit. The provisions of this article on the disassembled compressor means that the assembly of the compressor body shall be carried out in accordance with the provisions of the corresponding specifications, and the contents of its test run shall still be carried out in accordance with the relevant contents of this section.
Article 2.2.2 installation level is the most basic requirement for equipment installation. In order to prevent the phenomenon of missing inspection, this article is formulated separately.
Article 2.2.3 when connecting the compressor with the motor, it is necessary to adjust the coupling or pulley to align the motor. There are provisions in the technical documents of general equipment. If there are no provisions, the relevant provisions of the current national standard general code for construction and acceptance of mechanical equipment installation engineering shall be followed.
Article 2.2.4 no load test run, air load test run and vacuum test of compressor are important test run contents before load test run of compressor. Through these tests, the existing problems can be found and solved as soon as possible, which creates a good condition for the load test run of the compressor. If the medium and small open compressors should pass the above-mentioned test run inspection before leaving the factory, they should check and verify whether there are the above-mentioned test run records during installation; for the compressors without the above-mentioned test run records, in order to ensure the test run quality, they should carry out the test run according to the provisions of this article.
For large or disassembled compressors, the above-mentioned test run has not been carried out before leaving the factory, so the test run shall be carried out according to the requirements of this article. Because of the high requirements of factory test and internal residual water content, the semi closed compressor used in fluorine system is generally not subject to the above operation inspection during field installation. The vacuum test of the compressor refers to the vacuum test of the compressor.
Article 2.2.5 make clear the conditions and necessary inspection items before commissioning, so as to prepare for commissioning and prevent quality and personal accidents.
Article 2.2.6 according to the relevant provisions of the current national standard "technical conditions for medium piston single-stage refrigeration compressor", "test methods for medium piston single-stage refrigeration compressor" and the current national standard "test methods for single piston two-stage refrigeration compressor", the necessary technical requirements and inspection items for air-load test run are clearly specified for the purpose of inspecting the equipment During the no-load test run, whether the running condition and the condition of each part are normal or not, and make the moving parts run in at the same time, so as to lay a good foundation for the load test run.
Article 2.2.7 according to the relevant provisions of the current national standard "test methods for medium piston single stage refrigeration compressors", the requirements for air load test run of compressors are revised. The temperature rise of each part of the compressor is at the same time, relative to the ambient temperature; generally, the temperature of the main bearing, the outer side and the outer side of the shaft seal can be measured by the point thermometer.
Article 2.2.8 the vacuum test is the procedure that should be carried out in the test run. Among them, the crankcase pressure, oil pressure and other values refer to the relevant provisions of the current national standard "test methods for medium piston single stage refrigeration compressors".
Article 2.2.9 this article refers to the provisions of load test run of compressor, referring to the relevant provisions of the current national standard "technical conditions for medium piston single stage refrigeration compressor". Before the start-up of Freon compressor, the lubricating oil in the crankcase should be heated to separate the Freon dissolved in the lubricating oil and improve the lubrication and refrigeration efficiency. The heating temperature should be in accordance with the requirements of the equipment technical documents. When the open compressor is running, there should be a certain amount of oil leakage at the shaft seal, but it should not be greater than the specified value.

Section 3 screw refrigeration compressor unit
Section 2.3.1 this section defines the scope of this section. The commissioning of the main engine in the screw refrigerator shall also be carried out according to the relevant provisions of this section.
Article 2.3.2 this article is the regulation on the installation level of compressor unit and indicates the measurement position.
Article 2.3.3 clarify the conditions and necessary inspection items before the commissioning, and prepare for the trial run. Since the screw compressor is not allowed to reverse, when checking the motor steering, it is emphasized to disconnect the coupling, and then separate the compressor from the motor, and check the motor steering separately.
Article 2.3.4 this article is the requirement of compressor unit load commissioning. The relevant provisions of the current national standard "technical conditions for single stage oil injection screw refrigeration compressor" and "technical conditions of screw chiller" are referred. Because the refrigerant R12 and R22 will dissolve in the refrigerant oil in large quantities when the temperature is low, so that the lubrication effect and refrigeration efficiency will be affected during the start-up operation. Therefore, before the unit starts, especially in winter, the lubricating oil shall be heated. According to the experience of the manufacturer and installation unit, the heating temperature should be 45-50 ℃ as the best, so that the refrigerant R12 and R22 are separated from the lubricating oil.
Section 4 centrifugal refrigeration unit
Article 2.4.1 this article is the provisions of the scope of application of this section. The disassembly and delivery of compressor refers to the assembly of compressor body in accordance with the relevant specifications of the current national standard "code for construction and acceptance of compressor, fan and pump installation engineering". The commissioning shall be carried out according to the relevant contents of this specification.
Article 2.4.3 this article is the conditions and necessary inspection items before the commissioning of centrifugal refrigeration unit. The requirements and methods of flushing lubrication system are different from each manufacturer. There are two common ones: one is to add refrigerant oil to the lubrication system, and then start the oil pump for circulating flushing until the cleaning, and the washing time is not required;
Another is to add the refrigeration oil to the lubrication system, heat the oil temperature to 35-45 ℃, and start the oil pump for circulating flushing, and the flushing time shall not be less than 24h until the cleaning. Before flushing, remove the bearing oil supply pipe or use other methods to prevent dirt from entering the bearing. After flushing, replace the oil. The flushing method and requirements are mostly in accordance with the specific provisions of the manufacturer.
Article 2.4.4 this article is the provisions for air load commissioning of centrifugal refrigeration unit. In the five items, the motor is a fluorine cooling unit. During the air load test run, the operation time of the motor should be limited because the unit is not filled with fluorine and the motor has no cooling source. Therefore, the specification has made corresponding provisions; in the six items, the opening of guide vane is greater than 40% of the test run time should be shortened as far as possible, in order to prevent the unit from being overloaded and overheated due to air as the medium.
Article 2.4.5 this article is the provisions for unit load commissioning, and the relevant provisions such as the current national standards (technical conditions for centrifugal chillers) are referred to. The fast passing surge zone in the five items refers to that after the compressor starts, in order to prevent surge phenomenon, the guide vane shall be opened to 15% - 30% of the opening (limited to the current of the main motor not exceeding the rated value), and then gradually open the opening of the guide vane, and increase the load to make the unit put into normal operation and running.
Section 5 piping and ancillary equipment
Article 2.5.1 the application scope of this section only includes the auxiliary equipment and pipes in the compression refrigeration system, and these equipment and pipes are installed on site, rather than the auxiliary equipment and pipes on the refrigeration unit that do not need to be installed on site and have been connected and assembled at the factory.
Article 2.5.2 this article refers to the inspection contents to be carried out before the auxiliary equipment is in place. During the inspection, if any discrepancy with the design is found, the construction unit or the design department shall be contacted to solve the problem, and the construction unit shall not deal with it without authorization.
Article 2.5.3 this article is revised according to the relevant provisions of the current national standard code for construction and acceptance of ventilation and air conditioning engineering. Generally, the air tightness test has been carried out for the auxiliary equipment before leaving the factory. After leaving the factory, the air tightness test will be carried out when the equipment is transported and stored to the site for installation. The purpose is to find and solve the problems caused by improper transportation and storage or existing at the time of leaving the factory as soon as possible, ensure the quality of equipment installation, and avoid the problems caused by the equipment when the system air tightness test is carried out after installation It is difficult to detect leakage and rework due to problems. When the unit air tightness test is carried out for the auxiliary equipment, the equipment in the high-pressure system shall be carried out according to the test pressure of the high-pressure system, and the equipment in the low-pressure system shall be carried out according to the test pressure of the low-pressure system. The air tightness test pressure in table 253 refers to the relevant provisions of the current national standards "technical conditions for medium piston single stage refrigeration compressors", "general technical specifications for refrigeration equipment" and the current national standards (technical conditions for centrifugal chillers). The test pressure of the high-pressure system is based on the maximum condensation pressure of the refrigerant, and the test pressure of the low-pressure system is based on the saturated vapor pressure of the refrigerant at the maximum ambient temperature. In practical work, because a considerable part of refrigeration products are designed and produced according to the old standards, the test pressure is generally lower according to the past practice of the industry, and the standards are not uniform. Therefore, the provisions of the air tightness pressure value in this specification should generally be subject to the provisions of the design and equipment technical documents. If there is no provision, the value specified in this specification shall prevail, which is also stipulated in article 2511 and article 264. The purpose of unit purging of auxiliary equipment is to remove the internal pollutants and moisture caused by the transportation and storage of the equipment.
Article 2.5.4 this article is the regulation of common problems in the installation of refrigerant pump, and other contents required by the installation shall be implemented according to the corresponding specifications.
Article 2.5.5 this article is the regulation on the internal derusting of refrigeration pipeline before installation. There are many derusting methods, such as sand blasting, acid pickling, mechanical derusting, etc., which should be selected according to different requirements, and there is no specific provision in the specification.
Article 2.5.6 this article specifies the problems that should be paid attention to in the installation of refrigeration pipeline, which belongs to common problems.
Article 2.5.7 the installation requirements of liquid pipe and gas pipe in this article are to avoid air bag or liquid bag in the pipe due to improper pipe configuration.
The requirements of article 2.5.8 for the laying of suction and exhaust pipes are designed to reduce the thermal influence between suction and exhaust pipes.
Article 2.5.9 the connection slope of pipelines between equipment is very important to whether the refrigeration system can be successfully run after installation. This article is revised according to the relevant provisions of the current national standard "code for design of heating, ventilation and air conditioning of industrial enterprises". For the slope value, there shall be provisions in engineering design generally. If there is no regulation, the provisions of this specification shall prevail.
Article 2.5.11 is revised according to the relevant provisions of the current national standard "code for construction and acceptance of ventilation and air conditioning engineering". When the valve is tested for single body air tightness, there shall be no leakage at the sealing place outside the valve body, and only slight leakage is allowed on the sealing surface of valve disc and valve seat inside the valve.
Article 2.5.12 specifies common problems in valve installation, in which accessories refer to valve accessories.
Section 6 commissioning of compression refrigeration system
Article 2.6.1 specifies the work content to be carried out before the field assembled refrigeration system is put into trial operation. In the fourth paragraph, ammonia system is generally a large refrigeration system. After air tightness test and vacuum test, before filling with refrigerant, the system insulation work shall be carried out. In order to check the possible micro leakage not found in the air tightness test and eliminate hidden dangers, the ammonia system assembled on site shall be filled with a small amount of ammonia separately to detect leakage, and the system heat preservation can be carried out only after it is qualified Work to ensure the quality of the project.
When filling and filling the refrigerant after the heat preservation of the system, the leakage detection is generally carried out. Although there are similarities in the practice, there are different purposes in two different processes. The former is to find out the micro leakage in the system, and provide good quality guarantee for the next process of thermal insulation; the latter is mainly to eliminate the leakage of some loose connection parts during the insulation.
Article 2.6.2 at present, some large-scale refrigeration units (such as chillers) produced by domestic manufacturers are not filled with refrigerant at the factory, but only nitrogen filling seal is carried out. The unit is filled with refrigerant before it is transported to the site and before the system is put into trial operation.
Article 2.6.3 after the refrigeration equipment and pipelines are assembled on site, the purging and sewage of the refrigeration system is carried out, so as to purge and remove the welding slag, oxide scale, water content and other parts mixed into the system during the assembly process, so as to keep the system clean and make the subsequent commissioning smoothly.
Article 2.6.4 air tightness test is an important construction procedure in the installation of refrigeration equipment.
1、 When there is difficulty in distinguishing high and low-voltage systems, there are two situations:
1. some refrigeration units that cannot be separated by high and low pressure systems, such as centrifugal refrigeration units;
2. although the high and low pressure systems can be separated, due to the small number of separation valves between high and low pressure systems or the existence of micro internal leakage, the pressure drop of the high-pressure system exceeds the specified value while maintaining the pressure, and the leakage phenomenon cannot be found.
According to the above conditions, the specified pressure can be carried out under the test pressure of low-pressure system.
2、 The results of air tightness test are based on the pressure drop before and after the test. The meaning of pressure drop calculation formula is the actual leakage pressure drop after the influence of temperature change is deducted. That is, the actual pressure value at the end of the test is converted into the pressure at the temperature at the beginning of the test, and the difference from the pressure at the beginning of the test is the pressure drop. The pressure drop shall not be greater than 1% of the test pressure, which is proposed by referring to relevant technical data and construction experience.
Article 2.6.5 the purpose of vacuumizing the system is to further check the tightness of the system, and to prepare for filling refrigerant and eliminate moisture in the system. For many units, the residual pressure after vacuumizing the system should be less than 40mmhg for Freon system and less than 60mmhg for ammonia system. Some technical documents of equipment are also relaxed to 110mmhg. The vacuum holding time is also different, but the shortest time is generally more than 24h, so the article does not make specific provisions, but according to the requirements of equipment technical documents.
Clauses 2.6.6 and 2.6.7 are the specific requirements for leakage detection and refrigerant filling of ammonia system. It is revised on the basis of the original specification combined with many years of construction experience, so as to guide the correct ammonia filling leakage detection and filling refrigerant, and prevent the occurrence of quality and safety accidents.
In article 2.6.8, the conditions and inspection items for the load test run of the refrigeration system are specified on the basis of the original specification, so as to prepare for the smooth load test run.
Article 2.6.9 the sequence of the basic load test run in this article clearly specifies the relevant technical requirements and inspection items. The fourth section is the regulation of the load test run of the refrigeration equipment installation project, that is, the temperature can be reduced to the temperature specified in the design or equipment technical documents under the minimum additional load. Because other tests, such as cooling at full load, cooling capacity and reducing speed of the refrigerator, are manufacturing and design performance and are not within the scope of this specification. For the refrigeration system composed of several compressor units, each unit should be put into trial operation during the cooling process of trial operation.
Article 2.6.10 matters to be dealt with after the test run is completed, so as to prepare for the next operation or putting into use of refrigeration equipment.
Section 7 magnesium bromide absorption chiller
Article 2.7.1 this section is applicable to the absorption refrigeration unit with steam or hot water as heat source. The unit with other heat sources can refer to this section.
The requirements of article 2.7.2 for the installation level of units are revised in combination with many years of practical experience.
Article 2.7.3 this article is the installation requirements of vacuum pump in the unit. Three is to check the performance of the vacuum pump to meet the needs of the unit and ensure its normal operation.
Article 2.7.4 this article refers to the requirements for connecting the internal pipes of the large unit which is divided into several large parts.
Article 2.7.5 the air tightness test of the system is a necessary leak detection procedure. When filling nitrogen or dry compressed air for leak detection, the test pressure 0zmpa (gauge pressure) refers to the upper limit of the test pressure, which is generally taken as 015 ~ 02mpa (gauge pressure) in practical application. This article refers to the relevant provisions of the current national standard (test methods for absorption chillers).
Article 2.7.6 system vacuum test is also a necessary leak detection process. According to the current national standard "test methods for absorption chillers", the relevant provisions are referred.
Article 2.7.7 this article is the requirement for internal flushing of the unit. Generally, there are two flushing methods: one is to start the water pump in the unit for circulating flushing after adding water to the unit; the other is to use the heat source heated by the unit for circulating flushing on the basis of the former flushing method, which can be determined according to the requirements and conditions during construction.
On the basis of the original specification, article 2.7.9 refers to the relevant provisions of the current national standard "technical conditions for absorption chillers" and revises the specific requirements for system filling.
Article 2.7.10 is revised on the basis of the original specification, combining with many years of construction experience and referring to the technical requirements of relevant equipment. The specific gravity of refrigerant water mixed with bromination should not exceed 1.04, which is revised according to the technical requirements of relevant equipment.
Section 8 combined cold storage
Article 2.8.1 combined cold storage is a new product developed since 1980s. In order to meet the needs of this development, this section is added, which expands the scope of application compared with the original specification.
article 2.8.3 stipulates the contents of the inspection of the storehouse board. The inspection of the physical and mechanical properties of the storeboard and core foam plastics does not require the installation unit to test these performance indicators, but checks and checks the actual performance indicators of the physical distribution department according to the supply department or the construction list, so as to prevent the rework phenomenon.
Table 2.8.3 adopts the relevant provisions of the current national standard "technical conditions for thermal insulation sandwich panel for composite warehouse".
Article 2.8.4 this article specifies the basic requirements for the installation of the combined cold storage.
Article 2.8.5 ~ 2.8.7 formulate the technical requirements for the installation of air-conditioned cold storage according to the relevant provisions of the current national standard "performance test method of combined cold storage". Air-conditioned cold storage is a kind of storage body in combined cold storage.
Article 2.8.8 this article is formulated according to the relevant provisions of the current national standard "performance test methods for combined cold storage". Among them, the fourth one is the regulation that the newly designed combined cold storage needs to be assessed for the cooling of empty cold storage after on-site installation, and this assessment is not carried out for the combined cold storage that has been finalized and manufactured in batches.

Chapter III air separation equipment
Section 1 General Provisions
Article 3.1.1 the application scope of this chapter includes the installation of large, medium and small air separation equipment, but does not include the air separation equipment with special technical requirements, such as military, marine, mobile and liquid products.
Article 3.1.2 this article is formulated with reference to construction experience. Since there are many specifications and varieties of materials, valves and control instruments for complete sets of air separation equipment, especially large and medium-sized equipment, it is necessary to count, check and accept them carefully according to the sending list and packing list. This article is a conventional construction procedure, which can be checked in advance to find problems and prevent interruption of construction and influence on quality.
Article 3.1.3 this article emphasizes that no matter which construction unit carries out the construction of frost resistant foundation, there must be qualified inspection and test data, and the equipment shall be inspected and handed over to the installation construction unit before installation.
Article 3.1.4 at present, the stone cold storage in domestic air separation equipment has been replaced by other types of heat exchanger and molecular sieve, so the stone packing is not specified; if there is stone packing, it shall be implemented according to the provisions of the technical documents of the equipment.
Article 3.1.5 the pressure to be maintained in the high and low pressure chambers of the nitrogen filled sealing part shall refer to the relevant provisions of the current national standard technical conditions for aluminum air separation equipment.
Article 3.1.6 the degreasing method and degreasing agent are clearly specified in Chapter 5 and appendix of current national standard general specification for construction and acceptance of mechanical equipment installation engineering; the determination method and evaluation standard of oil residue on the surface of parts are also clearly specified in Appendix C of current national standard technical conditions for large and medium sized air separation equipment, which is no longer specified in this specification. This article specifies the degreasing requirements for air separation units, which is conducive to safe operation and prevention of combustion or explosion accidents.
Article 3.1.7 refers to the relevant provisions of the current national supervision regulation on safety technology of pressure vessels. As for the strength test before the pressure equipment is put in place, it is considered that the large and medium-sized air separation equipment is aluminum structure, plate fin heat exchanger, and the small air separation equipment is steel structure and tubular heat exchanger. The pressure equipment is non independent pressure parts, such as adsorber. These pressure equipment have been tested in the manufacturer, and have passed the strict inspection and are provided with equipment Products with quality certificate. Under the condition that the quality of the pressure equipment is guaranteed and the equipment is intact, repeated strength test for many times does not have much benefit. Therefore, this article stipulates that if the manufacturer has conducted the strength test and has a certificate, the strength test may not be conducted, but the air tightness test must be conducted. As for the storage time, it is difficult to specify the anti rust method, storage conditions, storage site and other reasons. Therefore, this article does not specify the storage time, and the strength test can be determined by the inspection results.
Article 3.1.9 this article is formulated in accordance with the relevant provisions of the current national regulations on safety technology supervision of pressure vessels. Since the opening pressure of the safety valve is slightly different from factory to factory, this article emphasizes that it should be carried out according to the technical documents of the equipment.
Article 3.1.11 this article is formulated in accordance with the current national standard technical conditions for large and medium air separation equipment. The purpose of the medium requirements for purging specified in this article is to prevent the degreased equipment from being polluted by oil again.
Article 3.1.12 refers to the current relevant national welding specifications and procedures. In order to avoid conflicts in the implementation, it is emphasized to implement according to the provisions of equipment technical documents. At present, the standards of welding wire and welding rod have been promulgated and implemented, so this article will not repeat.
Article 3.1.13 the installation requirements of compressors, fans and pumps in air separation plant are the same as the relevant provisions in the current national standard code for construction and acceptance of compressor, fan and pump installation engineering, and the relevant contents will not be repeated in this specification. Among them, the installation unit shall be responsible for the load test run with air or water as medium at normal temperature, and the construction unit shall participate in it. The construction unit shall be responsible for the load test run with other medium, and the installation unit shall participate in and solve the quality problems caused by the installation. If it is technically not allowed to use air or water as medium for single unit load test run at normal temperature, the single unit load test run and the complete set of air separation unit test run shall be combined.
Section 2 fractionator assembly
Article 3.2.1 this article is applicable to the installation of fractionator leaving the factory as a whole.
Article 3.2.2 this article is applicable to the installation of fractionator which is disassembled and delivered from the factory.
Article 3.2.4 the purpose of this article is to require correct lifting methods to prevent damage to equipment and pipelines.
Article 3.2.5 refers to the relevant manufacturing technical conditions of the air separation unit, and formulates the regulations on the positioning, alignment and leveling of the air separation unit.
Article 3.2.7 this article is revised with reference to the current national standard (code for construction and acceptance of steel structure engineering) and other relevant provisions.
Article 3.2.8 this article is a conventional regulation, which aims to prevent external stress and welding stress during piping, and prevent gas resistance and water accumulation in the pipe.
Article 3.2.9 this article emphasizes the requirements of aspect and gradient and horizontal pipe laying, which is conducive to the flow of liquid or gas in the pipe, without air or liquid resistance and improving the accuracy of measurement.
Article 3.2.11 this article is a routine inspection regulation to attract attention and prevent negligence.
Section 3 purging
Article 3.3.1 combined with many years of construction experience, the requirements before and after purging are specified.
Article 3.3.2 this article is the routine procedure requirement for purging, so as to prevent the dirt in the pipe from blowing into the fractionator.
Article 3.3.4 this article specifies the air pressure range value during purging, but in the implementation, it should also pay attention to comply with article 3.1.11 of this specification; that is, clean, dry and oil-free air should be used for oil-free equipment and pipelines, mainly to prevent degreased equipment and pipelines from being polluted again and meet the cleaning requirements.
Article 3.3.5 the purging time specified in this article is an assessment parameter. At the same time, it should be checked that there are no mechanical impurities on the white paper or cloth as the qualified standard.
Section 4 overall pressure test
Article 3.4.1 this article stipulates that the overall pressure test shall be carried out after the overall system is cleaned, so as to prevent dirt from entering the equipment or damaging the valve core. According to the construction site conditions, if the pressure test is carried out before purging, the measures to ensure the cleanliness of the whole system can be taken, or the pressure test can be carried out before purging.
Article 3.4.2 this article is applicable to pressure test of large and medium air separation equipment.
The scope of inlet and outlet valves in article 3.4.4 refers to the inlet and outlet valves which are used for air tightness test equipment separately.
Article 3.4.5 this article is the pressure test requirements for the air separation equipment leaving the factory as a whole. As clauses 3.4.2 to 3.4.4 of this section are the requirements for the test of the fractionator assembled on site after being disassembled and delivered from the factory, this clause is specified separately to prevent the leakage of the air tightness test of the fractionator installed as a whole.
Section 5 overall naked cooling test
Article 3.5.1 this article refers to the current national standard "performance test methods for large and medium air separation equipment" and commissioning experience, and specifies the requirements that the test personnel should meet, so as to prevent operation errors.
Article 3.5.3 this article stipulates that the naked cooling test shall be carried out according to the provisions of the technical documents of the equipment, mainly considering the different process flow and debugging procedures and methods, so as to prevent the blind test.
Article 3.5.4 the test record stipulated in this article is not only to provide basis for adjustment, but also to accumulate data for project acceptance.
Article 3.5.5 the purpose of this article is to prevent the bolt from loosening and air leakage at low temperature.
Although the article 3.5.6 does not stipulate the stop pressure inspection, the actual construction can also decide whether to stop pressure inspection according to the inspection situation, so as to ensure that it is tight and leak free.
Section 6 filling thermal insulation materials
Article 3.6.2 this article is general but necessary. If pearl powder is filled, round steel network should be installed at the powder feeding port to prevent operators from falling into the cold insulation box and drowning in pearl powder, resulting in casualties.
Article 3.6.3 the purpose of aerating the equipment and pipelines in the fractionation tower, ventilating the valve of the meter pipe and energizing the thermal resistance is to observe whether the equipment, pipelines, meter system and electrical system in the tower are damaged during the filling of the insulation material.
Section 7 rare gas extraction equipment
Clause 3.7.4 this clause stipulates that the air tightness test shall be conducted with nitrogen, or inert gas such as helium.
Section 8 turbo expander
Article 3.8.2 emphasizes that it shall be carried out according to the technical documents of the equipment to prevent blind disassembly and assembly and ensure that the original accuracy of manufacturing will not be affected.
Article 3.8.3 at present, the expanders produced by various domestic manufacturers have different structural forms, and the varieties are also updated, so the requirements for vertical and horizontal installation level are also different, so it is emphasized that they should comply with the provisions of the equipment technical documents.
Paragraph 4 and 5 of article 3.8.5 are the safe operation test under the maximum speed to prevent personal or equipment accidents.
Article 3.8.6 emphasizes that inspection records should be made to provide basis for future project acceptance.
Section 9 piston expander
Article 3.9.1 the structure of the piston expander is basically the same as that of the piston compressor, so in addition to the provisions of the equipment technical documents, the relevant provisions in the current national standard "code for construction and acceptance of compressor, fan and pump installation engineering" should also be referred to.
Section 10 high center cryogenic liquid pump
Article 3.10.1 the structure of centrifugal cryogenic liquid pump is relatively simple, but the operation at low temperature has its particularity. The assembly and trial operation of solid pump shall be carried out according to the provisions of equipment technical documents.
Article 3.10.2 this article is revised in combination with commissioning experience. The inclination direction is specified to facilitate the removal of gas in the liquid in the pump and pipeline and prevent cavitation.
Article 3.10.3 the centrifugal cryogenic liquid pump is strictly prohibited to run without liquid, otherwise the machine will be damaged.
Section 11 plug type cryogenic liquid pump
Article 3.11.1 according to the construction experience, in order to prevent blindness, it is emphasized that the cleaning and degreasing before the pump is in place should be carried out according to the provisions of the equipment technical documents.
Section 12 regenerative refrigerator
Article 3.12.2 the regenerative refrigerator leaves the factory as a whole and is filled with nitrogen, so it is not suitable to dismantle and wash it casually.
Article 3.12.3 refers to the relevant provisions of the current national standard technical conditions for regenerative refrigerators. The regenerative refrigerator has been filled with dry inert gas above 0.05Mpa before leaving the factory, so the inert gas should be checked or supplemented during installation.
Clause 3.12.4 specifies water quality requirements to prevent scaling or rust in watercourses.
Article 3.12.6 refers to the relevant provisions of the current national standard technical conditions for regenerative refrigerators. The steps, methods and technical requirements of commissioning shall be carried out according to the technical documents of the equipment.
Section 13 other equipment
Article 3.13.5 this article refers to the relevant provisions of the current national supervision regulations (pressure vessel safety technology supervision regulations).
Section 14 test run
Article 3.14.1 this article is put forward with reference to the experience of many years of actual commissioning. The test run of a complete set of air separation unit is operated under high, medium, low pressure and low temperature. Each operation link is required to be accurate and safe, so as to prevent explosion or combustion accidents.
Article 3.14.3 this article is revised with reference to the relevant provisions of the current national standard (performance test methods for large and medium air separation equipment) and in combination with practical experience. Due to the differences in unit size, equipment manufacturing and engineering design, the whole process of complete load test run to meet the design and equipment performance requirements, and producing qualified products, some are simple and short, while others are complex and long. This specification is mainly to assess the quality of the installation project, so the construction unit shall be responsible for organizing the load test run of the complete set of air separation equipment, and the installation unit shall cooperate with it for the test run; however, the installation unit cannot cooperate until the test production, equipment performance, product quality and quantity meet the requirements, so the installation unit shall cooperate with the construction unit for the test run of the complete set of air separation equipment, until the equipment quality meets the requirements The operation condition is stable, and then the operation parameters are measured, and the time of measuring parameters lasts until 4H. In case of any problem caused by installation during load test run, the installation unit shall be responsible for handling it. So far, the project can go through the acceptance procedures. After the acceptance of the project, if the problem is really caused by the installation, the installation unit shall still be responsible for handling it. Chapter IV project acceptance
Article 4.0.1 in order to ensure and continuously improve the installation quality of refrigeration equipment and air separation equipment, the provisions of project acceptance in this chapter are added. It is clear that the project acceptance procedures can be handled only after the equipment passes the system load test run, which provides a guarantee for the safe operation of the equipment.
Article 4.0.2 emphasizes that equipment shall not be put into use without project acceptance to prevent accidents.
Article 4.0.3 lists the data content that should be provided for the project acceptance, which can be used as the basis for the construction quality and acceptance of the equipment installation project.