CN104128334B - A kind of compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method - Google Patents
A kind of compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method Download PDFInfo
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- CN104128334B CN104128334B CN201410285439.3A CN201410285439A CN104128334B CN 104128334 B CN104128334 B CN 104128334B CN 201410285439 A CN201410285439 A CN 201410285439A CN 104128334 B CN104128334 B CN 104128334B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
- B08B2209/032—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces by the mechanical action of a moving fluid
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Abstract
Invention describes a kind of compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method, set lubricating oil system is divided into pipeline, compressor internal oil passages three parts of petrol station body, extemporaneous preparation, the pipeline oil of the oil flushing of petrol station body and extemporaneous preparation pipeline construction parallel operations, extemporaneous preparation rinse open and inspect with compressor, assembling parallel operations; Utilize nitrogen to be mixed in lubricating oil during oil flushing and produce minute bubbles, form air flow swirl at pipe interior, more effectively remove the obstinate impurity in dead angle, pipeline local, coordinate knocking of mallet to produce vibration, first mate improves oil flushing effect.This patent is advanced by the time point that the work of unit oil flushing starts, and optimizes working procedure, saves the absolute duration needed for oil flushing; Utilize nitrogen to be mixed in lubricating oil and produce minute bubbles, form air flow swirl at pipe interior, increased substantially oil flushing effect, be also more of value to the guarantee of quality.
Description
Technical field
The present invention relates to a kind of lubricating oil pipeline oil flushing method, particularly a kind of lubricating oil pipeline inflated with nitrogen segmentation oil flushing method.
Background technology
Lubricating oil pipeline oil flushing is the committed step ensureing that compressor bank lubricating oil system is clean.The lubricating system of compressor plays the important function of lubrication friction pair, cooling, most important to the normal operation of unit.Because the bush gap of compressor is less, the alloy in bearing shell face is softer, tiling alloy material can be caused to damage if there is impurity to enter bearing shell, the consequences such as continuous service can cause " tile kilning ", unit vibration exceeds standard, cause the problem that compressor stops, so compressor bank requires very high to the cleannes of lubricating oil system.Along with the compressor bank in petrochemical plant keeps the large-scale development, the lubricating oil system arranging independent petrol station gets more and more.Petrol station is installed after being made into sled block by producer at the scene, the lubricating pipe that petrol station is connected with unit fabrication and installation all at the scene.For ensureing the even running of machine set of long-period, before trial run, oil flushing to be carried out to meeting the requirement of equipment to cleannes to lubricating oil pipeline.
Compressor bank lubricating oil system oil flushing the oil-piping of petrol station body, extemporaneous preparation, compressor internal oil passages will be rinsed well.Generally all adopt bottom argon arc welding during the pipeline welding of extemporaneous preparation, after prefabricated, generally all adopt steam blowing, acid passivation process, the impurity in pipeline is less; Compressor internal oil passages is opened and inspect in process at compressor and is all cleaned, and cleannes are also better; Petrol station is producer's skid, producer considers that petrol station all needs the on-the-spot oil flushing that carries out again, so general inner cleannes are not high, and valve quantity is more on petrol station body, also be provided with oil cooler, oil cooler compares the large and inside of pipe diameter, and to have heat-exchanging tube bundle to cause lubricating oil to flow wherein comparatively slow, and it is long to rinse the time needed.
What current oil flushing adopted is first compressor bank in place, petrol station, then the centering of compressor, levelling is carried out, the work such as to clean, open and inspect, meanwhile carry out the prefabricated, pre-assembled of lubricating pipe, machine to be compressed is opened and inspect, surveying work terminates, and after compressor bank installs into, just starts the flushing carrying out set lubricating oil system, and the time of oil flushing is general all more than three weeks, directly affect the test run process of unit.
After the time that above-mentioned lubricating oil system oil flushing method oil flushing starts opens and inspect at unit, assembly working terminates, now compressor is about to enter running-in period, and the duration of a project also draws to an end simultaneously, and the time of oil flushing directly affects the process of whole engineering.And oil flushing main wash in fact at this moment or petrol station body, due to the design feature of petrol station itself, lubricating oil has dead angle bottom valve, and in oil cooler, flow velocity is slowly, and these all cause, and oil flushing efficiency is lower, washing time is long.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of compressor bank lubricating oil inflated with nitrogen segmentation oil flushing method, significantly improve at present the independent petrol station of widely used employing and carry out the oil flushing efficiency of the compressor bank lubricating oil system of lubricating, when utilizing " inflated with nitrogen discrete method " to carry out oil flushing, realize the time that oil flushing in advance starts, the effect improving unit interval oil flushing, save the unit test run front time in order to oil flushing, improve the cleannes of lubricating oil system entirety.
In order to realize the object solved the problems of the technologies described above, present invention employs following technical scheme:
A kind of compressor bank lubricating oil inflated with nitrogen segmentation oil flushing method of the present invention, in flushing, set lubricating oil system is divided into the pipeline of petrol station body, extemporaneous preparation, compressor internal oil passages three parts rinses, the pipeline oil of the oil flushing of petrol station body and extemporaneous preparation pipeline construction parallel operations, extemporaneous preparation rinse open and inspect with compressor, assembling parallel operations; Technical process comprises:
(1) petrol station body rinses: after unit petrol station installation qualification, namely start the oil flushing carrying out separately petrol station; Make interim connecting pipe from the total oil-feed port of petrol station and be connected to the total oil return opening of fuel tank, temporary pipeline end enters fuel tank place and installs the interim filter screen of 200 object, realizes fuel tank got back to by the lubricating oil circulatory system from petrol station outlet; Open lubricating oil system electric heater, controlling lubricating oil temperature and be back and forth elevated between 70 DEG C at 25 DEG C, when rinsing, being filled with nitrogen by the original interface of petrol station itself in pipeline; The method of concrete inflated with nitrogen is at interval of 20-40 minute inflated with nitrogen 15-25 minute, is filled with nitrogen pressure than lubricating oil pressure height 0.02Mpa; And the lubricating pipe knocked in instrument percussion vibration petrol station, the welding slag in pipeline, foreign material etc. can be departed from fast, up hill and dale with pipeline; Flushing makes without naked eyes visible foreign in pipeline, and mechanical admixture mass content is not more than 0.05%;
(2) pipeline UNICOM and Passivation Treatment: while compressor is opened and inspect, carries out the pipeline UNICOM of the pipe prefabrication between petrol station and compressor bank, petrol station and situ configuration; After pipe prefabrication between petrol station and compressor bank is complete, carry out acid wash passivation process;
(3) the pipeline oil of extemporaneous preparation rinses: the pipe prefabrication between petrol station and compressor bank is complete, after acid wash passivation process, tube pass is adjusted temporarily, all pipelines and petrol station are communicated with into one or several circulatory system, but do not enter compressor internal oil passages, and add filter screen at each oil return box mouth place, oil flushing is carried out together with petrol station; After the pipeline communication of petrol station and situ configuration, be filled with nitrogen at the interface at petrol station fuel feeding house steward place, carry out extemporaneous preparation pipeline inflated with nitrogen oil flushing; When on each oil return box mouth place filter screen without hard particles time, compressor internal oil passages oil flushing operation can be entered; Flushing makes without naked eyes visible foreign in compressor internal oil passages, and mechanical admixture mass content is not more than 0.05%; Oil flushing efficiency and the effect of the pipeline of extemporaneous preparation can be improved like this;
(4) compressor is opened and inspect, is assembled; The pipeline oil prepared at the scene rinses simultaneously, carries out compressor and opens and inspect, assembles;
(5) after opening and inspecting at compressor, having assembled, then allow lubricating oil enter compressor internal oil passages to rinse; Continuous flushing make on oil site filter screen without naked eyes visible foreign, and mechanical admixture mass content is not more than 0.05% for qualified;
(6) compressor internal oil passages rinses: the pipe flushing configured at the scene completes, and after compressor opens and inspect, assembled, make lubricating oil enter compressor internal oil passages to rinse, and according to in-situ precast pipeline oil rinse time inflated with nitrogen method, be filled with nitrogen when compressor internal oil passages oil flushing, improve the cleannes of overall lubricating oil system; Flushing makes without naked eyes visible foreign in compressor internal oil passages, and mechanical admixture mass content is not more than 0.05%.
Described segmentation be set lubricating oil system is divided into the pipeline of petrol station body, extemporaneous preparation, compressor internal oil passages three parts rinse, and when rinsing to lubricating oil system in be filled with nitrogen.
Concrete, described petrol station body flushing process is: after unit petrol station installation qualification, namely starts to carry out petrol station oil flushing separately; First labor cleaning is carried out to fuel tank, with dough, the greasy dirt of fuel tank internal, fibre object, hard particles are cleaned out; Prepare interim connecting pipe to tank drainback mouth from total oil-feed port of petrol station, temporary pipeline inside will process totally, and oil return box place installs filter screen additional; Utilize the existing pipe joint of fuel pump outlet Near Pipelines, connect nitrogen cylinder and carry out filling nitrogen, fill on nitrogen line and want mounted valve; Add lubricating oil in petrol station fuel tank, open oil pump, carry out the independent inflated with nitrogen oil flushing of petrol station.
Concrete, described compressor internal oil passages rinses detailed process: after opening and inspecting at compressor, assembling, time on the filter screen of the pipe flushing of extemporaneous preparation without hard particles, recover the former flow process of lubricating pipe, lubricating oil is made to carry out each oil site of compressor, and install filter screen additional at unit oil site flange place, utilize the nitrogen mouth that fills during extemporaneous preparation pipe flushing to be filled with nitrogen, carry out compressor internal oil passages inflated with nitrogen oil flushing.
Concrete, when each stage carries out inflated with nitrogen, all need the valve first opening nitrogen cylinder place, treat that nitrogen is full of nitrogen blanketing valve road, when pressure is higher than lubricating oil pressure 0.02MPa, then open nitrogen fill valve door.One-period fill nitrogen at the end of, first close nitrogen fill valve door, then close the valve on nitrogen cylinder, object prevents lubricating oil from entering nitrogen blanketing valve road.The nitrogen be filled with is by the drain discharge on fuel tank.
Concrete, the described instrument that knocks can be mallet, rubber hammer or sticking plaster.
By adopting technique scheme, a kind of compressor bank lubricating oil system inflated with nitrogen segmentation oil flushing method of the present invention, has following beneficial effect:
(1) in the construction of compressor bank lubricating oil system oil flushing, by changing the pipeline construction of original extemporaneous preparation, compressor is opened and inspect, assembled after, start the continuous productive process of lubricating oil system oil flushing again, pipeline oil for the independent oil flushing of petrol station and extemporaneous preparation pipeline construction parallel operations, extemporaneous preparation rinse open and inspect with compressor, assembling parallel operations, be advanced by the time point that the work of unit oil flushing starts, optimize working procedure, save the absolute duration needed for oil flushing.
(2) the innovation of the present invention's oil flushing more in the past to be also when oil flushing to be filled with nitrogen in lubricating oil, utilize nitrogen to be mixed in lubricating oil and produce minute bubbles, air flow swirl is formed at pipe interior, and along with lubricating oil be flowing in pipeline local dead angle produce bubbles burst, more effectively remove the impurity such as oxide skin, iron filings of dead angle, pipeline local stubbornness, coordinate knocking of mallet to produce vibration, first mate improves oil flushing effect.
(3) the present invention is advanced by the time that oil flushing starts, the oil flushing of petrol station is taken into account while unit installation, improve the operating efficiency of pincers worker when whole compressor bank construction, reduce unit all to have constructed simultaneously, the workload of oil flushing construction before solo test run, both saved the duration also be more of value to the guarantee of quality.
Accompanying drawing explanation
Fig. 1 is petrol station inflated with nitrogen oil flushing flow chart.
Fig. 2 is not enter to lubricate oil drop oil flushing flow chart.
Fig. 3 is into oil site oil flushing flow chart.
In figure, 1-oil strainer, the rotating shaft of 2-oil cooler, 3-petrol station oil pump, 4-electric heater, the interim filter screen of 5-, 6-fuel tank, 7-petrol station blow-down pipe, 8-petrol station manhole, the self-loopa of 9-petrol station is communicated with line temporarily, 10-nitrogen cylinder, 11-inflated with nitrogen pipeline, 12-fuel feed pump, 13-unit, 14-unit free end bearing housing is communicated with line temporarily, 15-oil return pipe, 16-unit drive end bearing case is communicated with line temporarily.
Detailed description of the invention
Embodiment 1
After petrol station is installed, interim connecting pipe is made to the total oil return opening of fuel tank from the total oil-feed port of petrol station, temporary pipeline end enters fuel tank place and installs the interim filter screen of 200 object, remove petrol station fuel pump outlet place pressure impulse line, the interim pipeline of fabrication and installation is filled with lubricating oil system nitrogen, nitrogen pressure is than lubricating oil pressure height 0.02MPa, lubricating oil is added in petrol station fuel tank, start oil pump, adjustment lubricating oil pressure is 0.1MPa, open lubricating oil system electric heater, control lubricating oil temperature to be back and forth elevated between 70 DEG C at 25 DEG C, 20 minutes nitrogen is filled at interval of 30 minutes, and the lubricating pipe knocked with mallet in petrol station, flushing makes without naked eyes visible foreign in compressor internal oil passages, and mechanical admixture mass content is not more than 0.05%.
After in petrol station, to the lubricating pipe of unit, prefabricated and acid wash passivation is disposed, connection supplies, oil return house steward, also increase for oil inlet pipe adjustment direction and be communicated with line temporarily, make it the oil site not entering unit, and enter the fuselage oil sump of compressor or be directly communicated with oil return pipe, and install 200 mesh filter screens additional in interim end of line, utilize the upper existing instrumentation tap of petrol station fuel feeding house steward, prepare interim pipeline and connect nitrogen cylinder, start oil pump and carry out oil flushing, carry out extemporaneous preparation pipeline inflated with nitrogen oil flushing, during flushing, knock welding bead and the dead angle place of pipeline with mallet.
Open and inspect at compressor, assemble complete, time on extemporaneous preparation pipeline oil flushing filtering net without hard particles, recover the flow process of lubricating pipe, lubricating oil is made to carry out each oil site of compressor, and install filter screen additional at unit oil site flange place, utilize the nitrogen mouth that fills during extemporaneous preparation pipe flushing to be filled with nitrogen, carry out compressor internal oil passages inflated with nitrogen oil flushing.Treat continuous flushing one hour, on oil site filter screen without naked eyes visible foreign time, then mechanical admixture chemical examination is carried out in sampling, is not more than 0.05% for qualified.
Embodiment 2
The centrifugal refrigerant compressor group lubricating oil system 3, certain construction site, adopt the technical scheme that the present invention describes, achieve unit petrol station and first carry out oil flushing, after the pipeline construction of prefabricate and install at the scene, entirety carries out oil flushing again, and is filled with nitrogen in flushing process, and 15 days used times completed oil flushing work, be advanced by about one week than common method, achieve set lubricating oil system high efficiency, high-qualityly complete oil flushing work.
Embodiment 3
In the reciprocating reformation hydrogen supercharger lubricating oil system of 2 four, certain construction site row, adopt the technical scheme that the present invention describes, achieve unit petrol station and first carry out oil flushing, after the pipeline construction of prefabricate and install at the scene, entirety carries out oil flushing again, and is filled with nitrogen in flushing process, and 12 days used times completed oil flushing work, be advanced by about 10 days than common method, achieve set lubricating oil system high efficiency, high-qualityly complete oil flushing work.
Embodiment 4
In the reciprocating reformation hydrogen supercharger lubricating oil system of 2 four, certain construction site row, adopt the technical scheme that the present invention describes, achieve unit petrol station and first carry out oil flushing, after the pipeline construction of prefabricate and install at the scene, entirety carries out oil flushing again, but be not filled with nitrogen in each flushing process, 18 days used times completed oil flushing work, were advanced by about 6 days than common method.
Comparative example 1
2, certain construction site reciprocal resolution gas compressor of four row opposed types, after petrol station is in place, carries out that compressor operation platform is perfect, machine location adjustment, but does not carry out petrol station oil flushing.After one week, compressor operation platform is perfect, after machine location adjustment, start the configuration carrying out in-situ precast pipeline, one week duration completed pipe prefabrication and pre-assembled, and carried out pipe pickling immediately, qualified rear recovery Pipe installing.Petrol station is after 40 days in place, and compressor is opened and inspect complete, to lubricating oil system charging-up lubricant oil, arranges temporary jumper and does not first enter each oil site of compressor by lubricating oil, and direct oil return station fuel tank, and add the interim filter screen of 200 order at each oil return opening.Open lubricating oil system electric heater, control lubricating oil temperature to be back and forth elevated between 70 DEG C at 25 DEG C, and the lubricating pipe knocked with mallet in petrol station, after 20 days, without hard particles on the interim filter screen of each oil return opening, then the jumper of each oil site of compressor is removed, install the interim filter screen of 200 order additional entering oil site flange port, lubricating oil is allowed to enter oil site, after 7 days, on oil site filter screen, macroscopic particle is less than 3 points/square decimeter, without hard particles, carry out oil testing mechanical admixture mass content and be less than 0.05%, oil flushing is qualified.From oil flushing to qualified, share 27 days time.
Claims (5)
1. a compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method, it is characterized in that: in flushing, set lubricating oil system is divided into the pipeline of petrol station body, extemporaneous preparation, compressor internal oil passages three parts rinse, the pipeline oil of the oil flushing of petrol station body and extemporaneous preparation pipeline construction parallel operations, extemporaneous preparation rinse open and inspect with compressor, assembling parallel operations; Technical process comprises:
(1) petrol station body rinses: after unit petrol station installation qualification, namely start the oil flushing carrying out separately petrol station; Make interim connecting pipe from the total oil-feed port of petrol station and be connected to the total oil return opening of fuel tank, temporary pipeline end enters fuel tank place and installs the interim filter screen of 200 object, realizes fuel tank got back to by the lubricating oil circulatory system from petrol station outlet; Open lubricating oil system electric heater, controlling lubricating oil temperature and be back and forth elevated between 70 DEG C at 25 DEG C, when rinsing, being filled with nitrogen by the original interface of petrol station itself in pipeline; The method of concrete inflated with nitrogen is at interval of 20-40 minute inflated with nitrogen 15-25 minute, is filled with nitrogen pressure than lubricating oil pressure height 0.02Mpa; And the lubricating pipe knocked in instrument percussion vibration petrol station, the welding slag in pipeline, foreign material are departed from pipeline fast, up hill and dale; Flushing makes without naked eyes visible foreign in pipeline, and mechanical admixture mass content is not more than 0.05%;
(2) pipeline UNICOM and Passivation Treatment: while compressor is opened and inspect, carries out the pipeline UNICOM of the pipe prefabrication between petrol station and compressor bank, petrol station and situ configuration; After pipe prefabrication between petrol station and compressor bank is complete, carry out acid wash passivation process;
(3) the pipeline oil of extemporaneous preparation rinses: the pipe prefabrication between petrol station and compressor bank is complete, after acid wash passivation process, tube pass is adjusted temporarily, all pipelines and petrol station are communicated with into one or several circulatory system, but do not enter compressor internal oil passages, and add filter screen at each oil return box mouth place, oil flushing is carried out together with petrol station; After the pipeline communication of petrol station and situ configuration, be filled with nitrogen at the interface at petrol station fuel feeding house steward place, carry out extemporaneous preparation pipeline inflated with nitrogen oil flushing; When on each oil return box mouth place filter screen without hard particles time, compressor internal oil passages oil flushing operation can be entered; Flushing makes without naked eyes visible foreign in compressor internal oil passages, and mechanical admixture mass content is not more than 0.05%;
(4) compressor is opened and inspect, is assembled; The pipeline oil prepared at the scene rinses simultaneously, carries out compressor and opens and inspect, assembles;
(5) after opening and inspecting at compressor, having assembled, then allow lubricating oil enter compressor internal oil passages to rinse; Continuous flushing make on oil site filter screen without naked eyes visible foreign, and mechanical admixture mass content is not more than 0.05% for qualified;
(6) compressor internal oil passages rinses: the pipe flushing configured at the scene completes, and after compressor opens and inspect, assembled, make lubricating oil enter compressor internal oil passages to rinse, and according to in-situ precast pipeline oil rinse time inflated with nitrogen method, be filled with nitrogen when compressor internal oil passages oil flushing, improve the cleannes of overall lubricating oil system; Flushing makes without naked eyes visible foreign in compressor internal oil passages, and mechanical admixture mass content is not more than 0.05%.
2. compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method according to claim 1, is characterized in that: described petrol station body flushing process is: after unit petrol station installation qualification, namely starts to carry out petrol station oil flushing separately; First labor cleaning is carried out to fuel tank, with dough, the greasy dirt of fuel tank internal, fibre object, hard particles are cleaned out; Prepare interim connecting pipe to tank drainback mouth from total oil-feed port of petrol station, temporary pipeline inside will process totally, and oil return box place installs filter screen additional; Utilize the existing pipe joint of fuel pump outlet Near Pipelines, connect nitrogen cylinder and carry out filling nitrogen, fill on nitrogen line and want mounted valve; Add lubricating oil in petrol station fuel tank, open oil pump, carry out the independent inflated with nitrogen oil flushing of petrol station.
3. compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method according to claim 1, it is characterized in that: compressor internal oil passages rinses detailed process and is: after opening and inspecting at compressor, assembling, time on the filter screen of the pipe flushing of extemporaneous preparation without hard particles, recover the former flow process of lubricating pipe, lubricating oil is made to carry out each oil site of compressor, and install filter screen additional at unit oil site flange place, utilize the nitrogen mouth that fills during extemporaneous preparation pipe flushing to be filled with nitrogen, carry out compressor internal oil passages inflated with nitrogen oil flushing.
4. compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method according to any one of claim 1,2 or 3, it is characterized in that: when each stage carries out inflated with nitrogen, all need the valve first opening nitrogen cylinder place, treat that nitrogen is full of nitrogen blanketing valve road, when pressure is higher than lubricating oil pressure 0.02MPa, then open nitrogen fill valve door; One-period fill nitrogen at the end of, first close nitrogen fill valve door, then close the valve on nitrogen cylinder, object prevents lubricating oil from entering nitrogen blanketing valve road, and the nitrogen be filled with is by the drain discharge on fuel tank.
5. compressor bank lubricating oil pipeline inflated with nitrogen segmentation oil flushing method according to any one of claim 1,2 or 3, is characterized in that: the described instrument that knocks is mallet, rubber hammer or sticking plaster.
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| CN104525534B (en) * | 2014-12-11 | 2016-11-23 | 南京梅山冶金发展有限公司 | A kind of Combined impact washing oil case and using method thereof |
| CN106742010A (en) * | 2015-11-24 | 2017-05-31 | 中航贵州飞机有限责任公司 | A kind of aircraft fuel system cleaning Vehicle |
| CN106345756B (en) * | 2016-08-23 | 2018-04-24 | 中国化学工程第十六建设有限公司 | A kind of large-scale compressor group oil circuit integral construction method |
| CN106545519A (en) * | 2016-12-10 | 2017-03-29 | 大连福佳·大化石油化工有限公司 | Bearing of compressor case tail steam reclamation system |
| CN110375185B (en) * | 2019-06-18 | 2024-01-26 | 岳阳长炼机电工程技术有限公司 | Oil transportation method of lubricating oil system of key unit equipment of chemical plant |
| CN111715635A (en) * | 2020-06-13 | 2020-09-29 | 中国化学工程第十一建设有限公司 | Compressor oil circulation method |
| CN114178262A (en) * | 2021-12-03 | 2022-03-15 | 东风汽车股份有限公司 | Device for dredging pipeline of grease lubrication system and using method |
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