College】 【weak air separation, refrigeration equipment and construction equipment installation and acceptance requirements (2).

<br> <BR> Section screw refrigeration compressor <BR> <BR> paragraph 2.3.1 of this section defines the scope of this section. .Screw chillers on the host should also commissioning the relevant provisions of this section. .<BR> <BR> Article 2.3.2 of this section is a level of compressor installation requirements, and specify the measurement location. .<BR> <BR> Section 2.3.3 to clarify its test run before the qualifications and necessary inspection matters, to prepare for the test run. .Screw compressor which does not allow the reverse, the steering motor in check, stressed disengage coupling, separation of the compressor and motor, electric motor turning a single check. .<BR> <BR> Section 2.3.4 for the compressor load this Article commissioning requirements. .Reference to the current national standard "oil-injected screw-type single-stage refrigeration compressor) and the" screw chiller technology, "the relevant provisions. .In which the refrigerant R12, R22 when the temperature is low, it will dissolve a lot of oil in the freezer, so start the operation will affect the efficiency of lubrication effect and reduce cooling, thus generating units before the start, especially in the winter, heating oil deal .. .Manufacturing and installation of units in the light of experience in testing, the heating temperature should generally be better to 45 ~ 50 ℃, the refrigerant R12, R22 separated from the oil. .<BR> <BR> IV <BR> <BR> centrifugal chillers in Article 2.4.1 of this section is the application of the provisions of this section. .The disintegration of the factory here is the compressor assembly of the compressor body should be the existing national standard "compressor, fan and pump installation and acceptance of construction) and the implementation of relevant norms, the commissioning should refer to the implementation of the relevant contents of this specification..<BR> <BR> Article 2.4.3 of this section for the first centrifugal chiller before commissioning the qualifications and necessary inspection items. .On the lubrication system flushing, washing all the requirements and methods of manufacturing are not the same, commonly used in two ways: one is the lubrication system to join the frozen oil, the oil pump to start circulating flushing, washing clean up until the time did not require washing .; <BR> <BR> joined the other is frozen oil lubrication system, the heating oil temperature to 35 ~ 45 ℃, and switch on the pump for circulating flushing, flushing time of less than 24h, until the rinse clean. .Bearings should be removed before washing or other methods for preventing pipeline dirt into the bearings, should be replaced with new oil after washing. .Most irrigation methods and requirements specified by the manufacturer. .<BR> <BR> Article 2.4.4 of this section for the first centrifugal chiller air load commissioning rules. .Five fluorine in the motor through the cooling unit, during the commissioning of the air load when the unit is not sufficient as fluorine, Motor cooling source, and its running time should be limited, it makes provision specifications; six, the lead .vane opening time of greater than 40% of the commissioning requirements should be as short as possible, is to prevent unit operation with air as the medium that bear the load is too large, the occurrence of overheating. .<BR> <BR> Section 2.4.5 for the unit load test run this article provided the state with reference to current standards (technical conditions for centrifugal chillers) and other relevant regulations. .Quickly through the five surge zone, is the compressor starts, in order to prevent surge phenomenon, it should quickly turn up the guide vane to 15% to 30% of the opening (in the main motor current rating is limited to no more than .), and then gradually turn up guide vane opening, increasingthe load the unit into normal operation. .<BR> <BR> V <BR> <BR> ancillary equipment and piping in Clause 2.5.1 the scope of this section only in the compression refrigeration system ancillary equipment and piping, and the equipment and piping in the field .to install, not the need to install in the field, factory assembled refrigeration units are connected on the ancillary equipment and piping. .<BR> <BR> Section 2.5.2 of this section refers to the ancillary equipment shall place the inspection should be carried out before the content. .During the inspection, such as the discovery and design discrepancies, or design and construction units should contact address, the construction units should not be their own hands. .<BR> <BR> Section 2.5.3 this article is based on the current national standard, "Ventilation and air conditioning installation and acceptance of" the relevant provisions of the amendment. .Ancillary equipment are generally carried out before leaving the factory air-tightness test, after leaving the factory by the transport, storage to the site installation of air tightness test again, with the aim of early detection and resolution of equipment due to transport, caused by improper storage or factory .to existing problems, to ensure the quality of equipment installed to prevent equipment installed after the leak test the system, because of equipment problems caused by leak detection difficult and rework. .<BR> <BR> Ancillary equipment for single air-tightness test, the high-voltage devices in the system test pressure shall be high pressure system, low voltage devices in the system test pressure low pressure system should be carried out. .Table 253 air-tightness test pressure in the light of the current national standard "medium-sized single-stage piston compressor technology,", "General technical specifications for refrigeration equipment) and current national standards (technical conditions for centrifugal chillers) the relevant provisions. .Test pressure of high pressure system which is based on the maximum refrigerant condensing pressure, low pressure system test pressure is the maximum ambient temperature at the saturated vapor pressure of the refrigerant drawn. .<BR> <BR> In practical work, as there is still a considerable portion of refrigeration products designed and manufactured according to old standards, the test pressure according to industry practices are generally selected over lower standards are not unified, so the specification of the gas .confidentiality provisions of the pressure values, the general should be to design and equipment technical documents shall prevail. .No provision should be based on the value of the norms prevail in the future section 2511, section 264 provided in the same way. .Monomer purge ancillary equipment, designed to clear the equipment in the transport, storage process caused by internal contamination, water and so on. .<BR> <BR> Section 2.5.4 of this section is the Article refrigerant pump installation provisions of the common problems of the other elements required to install the appropriate regulatory requirements should be implemented. .<BR> <BR> Section 2.5.5 of this section is the Article before the pipe cooling pipe installation, etc. within the provisions of rust. .More rust methods, such as: sand blasting method, pickling, mechanical descaling law, should be different requirements for selection, the specification does not make specific provisions. .<BR> <BR> Section 2.5.6 of this section shall require the installation of refrigeration piping makes provision for attention, are common problems. .<BR> <BR> First section of Article 2.5.7 of the liquid pipe and gas pipe installation requirements, the purpose is to avoid pipeline configuration in the pipe caused by improper air bag or sac. .Section 2.5.8 <BR> <BR> Article suction and discharge pipe laying requirements intended to reduce the suction and discharge pipe between the heat affected. .<BR> <BR> Section 2.5.9 shall pipeline connection between devices on the cooling system after the installation aspect can make a trial run smoothly is very important. .Reference to existing national standards of this section "industrial heating, ventilation and air conditioning business design," the relevant provisions of the amendment. .The value of its slope, engineering design should have provisions in general, no provision should be based on this specification shall prevail. .Section 2.5.11 <BR> <BR> article under the existing national standards, "ventilation and air conditioning construction and acceptance of" the relevant provisions of the amendment. .Single valve leak test, the body should be no external leakage of seals, valves and valve seat within the valve plate sealing surface only with a little leak. .<BR> <BR> Section 2.5.12 of the valve installed in the article makes provision for the common, which means the valve attachment accessories. .<BR> <BR> VI refrigeration system commissioning <BR> <BR> Section 2.6.1 clarifies the assembly of the refrigeration system into the scene should be conducted before commissioning the work content. .One fourth paragraph of ammonia refrigeration systems are generally larger system, leak test, vacuum test, before filling the refrigerant to the system, insulation work, in order to check the system may exist in the air tightness test .found no trace leaks and eliminate hidden dangers of ammonia on-site assembly of separate charging system should also be a small amount of ammonia leakage detection, insulation system can be carried out after passing the work to ensure project quality. .<BR> <BR> Insulation work in the system after filling the refrigerant, the general must also be leak detection, leak detection of these two despite similarities in approach, but on each of two different processes .different purposes. .The former is present in the system to search for trace leaks, insulation for the next process to provide a good quality assurance; latter is possible to eliminate some of the insulation during the loose joints leak occurred. .<BR> <BR> The first domestic manufacturer of Article 2.6.2 the production of some large refrigeration units (such as chillers, etc.) is not the factory refrigerant charge, but only the nitrogen seal, the unit transported to the site to the system test .just before the filling operation of refrigerant. .<BR> <BR> Section 2.6.3 refrigeration equipment and piping shall assemble at the scene after the purge of the cooling system, the sewage, the purpose is to assemble mixed system in the process of welding slag, scale, water, etc. Purge .excluded, to keep the system clean, so after the test run can be carried out smoothly. .<BR> <BR> Section 2.6.4 for the leakage test shall refrigeration equipment installed in a major construction process. .<BR> <BR> First, high and low pressure systems have difficulty distinguishing, the following two situations: <BR> <BR> 1. High and low pressure system can not separate some of the refrigeration unit, such as centrifugal chillers; < .BR> <BR> 2. high and low pressure systems although can be separated, but because of high and low pressure separation between the systems or the existence of micro valves within the vent less, when the high pressure system packing the pressure drop exceeds the specified value, but check .no leakage phenomenon. .<BR> <BR> The above, the provisions of packing can be unified in the low-pressure system under test pressure. .<BR> <BR> Second, the air tightness test after test results based on the pressure drop as a basis for evaluation. .Pressure drop calculation formula is the significance of the effect of deducting the actual temperature leakage of pressure drop, is about to test the actual pressure value at the end, converted into tests at the beginning of the pressure temperature, and pressure test at the beginning of the pressure difference that its .down. .Pressure drop test pressure should be less than 1% of the relevant technical information and reference to the experience of the construction. .<BR> <BR> Section 2.6.5 The purpose of Article vacuum system, first in order to further check the tightness of the system, and second, to prepare for the filling of refrigerant, and remove system moisture. .Many units remaining after the system vacuum pressure Freon system should be less than 40mmHg, and the ammonia system should be less than 60mmHg, and some equipment, technical documents are also relaxed to 110mmHg for. .Vacuum to keep the time varied, but generally the shortest in more than 24h so the provisions do not make specific provisions, while the equipment requirements of technical documents. .<BR> <BR> Section 2.6.6, section 2.6.7 of this section for the ammonia system, two grams of ammonia refrigerant leak detection and filling the specific requirements. .Is based on the original specification with many years of construction experience amendment to guide correctly and filling charge leak of ammonia refrigerant, the quality and safety to prevent accidents. .<BR> <BR> Section 2.6.8 based on article in the original specification will be commissioning refrigeration system load conditions and checks should have been clearly defined project for the load test run can be smoothly prepared. .<BR> <BR> Section 2.6.9 shall take this basic arrangement of the load test run of the order of procedure, the relevant technical requirements and inspection of the project were clearly defined, including the installation of refrigeration equipment Disi Kuan is to what extent the load test run .the requirement that the load applied to the minimum so that the temperature dropped to the design of technical documents or equipment until the specified temperature. .Because other tests, such as full load cooling, chiller cooling capacity, lower speed performance for the manufacturing and design, not a scope of this specification. .Composed of more than one compressor of the refrigeration system, the commissioning of the cooling process, each unit should be through commissioning. .<BR> <BR> Section 2.6.10 shall be dealt with after the end of commissioning issues for the next operation of refrigeration equipment, or put into use to prepare. .<BR> <BR>.