The first section, the project content

The main contents of the project include: procurement of consumables and accessories for all kinds of cold storage engineering equipment and facilities, warehouse installation, hoisting of internal and external machines, laying of connecting pipes, pipe insulation, installation of drainage pipes, line erection and connection, installation of control system, wiring of internal and external machines and system debugging. The power supply required by the cold storage unit, that is, the incoming cable, is not within the scope of this installation. The cold storage and unit foundation shall be constructed by civil engineering, and we are responsible for providing relevant power distribution parameters and drawings.

Main construction methods and technical requirements in the second quarter

A, the installation project total program

Manpower organization, machine approach, drawing review and technical disclosure, material procurement approach, support bracket production, warehouse splicing, partition wall perforation, drainage pipe installation, support bracket installation, main line welding installation, main line insulation,

Bifurcation pipe welding, pipeline insulation, control line laying, indoor unit fixing and interface, outdoor unit hanger fixing and interface, pipeline system purging, pressure test, drain pipe leakage test, system vacuumizing, system fluorine filling, debugging, operation, system final layout and acceptance.

Second, the installation points and technical requirements:

1. Partition wall perforation and its treatment:

Because the system piping and drainage requirements need to pass through the warehouse body and the wall surface, the position and size of the borehole should be examined and approved, and the size of the borehole should be marked on the wallboard after it is correct. Wall drilling can only be carried out after the opinions of on-site civil technicians have no influence on the building structure. When the pipe passes through the hole in the wall, punch it with an electric hammer. If the wall is not suitable for electric hammer drilling, other methods can be used to drill holes after obtaining the consent of the owner. The size of the hole is subject to the pipeline (including insulation layer) that can pass through. Steel casing shall be set at the pipeline wall, and the pipeline weld shall not be placed in the casing. The galvanized iron sleeve should be flush with the wall or floor, but at least 20 mm above the ground. The gap between pipeline and casing shall be filled with heat insulation material or other incombustible materials, and casing shall not be used as the support of pipeline.

2. Installation of devices in the warehouse:

Steps: Determine the position of the unit in the warehouse → Draw a line to mark the position → Reamer reaming → Fix the support rod at the top of the warehouse → Connect the ceiling screws of the unit → Fix the unit in the warehouse.

3. Refrigerant pipeline:

(1) Steps: piping → pipeline laying → welding → purging → leak testing → drying → heat preservation.

(2) Principles Refrigerant piping should strictly abide by the three principles of piping: dryness, cleanliness and airtightness.

The first step of drying is to prohibit water from entering the copper tube before installation, followed by blowing clean and vacuum drying after piping. Cleaning means cleaning the pipeline during construction, replacing welding with nitrogen during welding, and finally blowing it clean. Air tightness test is the last air tightness test to ensure welding quality and bell mouth connection quality.

(3) Method of replacing nitrogen:

When brazing, the refrigerant pipe must be protected by nitrogen, with a slight pressure (3~5kg/cm? Filling nitrogen into the welded pipeline will effectively prevent the formation of scale in the pipeline.

(4) Sealing cover of refrigerant pipe:

It is very important to cover the refrigerant pipe. In order to prevent moisture, dirt and dust from entering the pipeline, the refrigerant pipe must be wrapped when it passes through the wall, and the installed pipeline that is temporarily disconnected should also be wrapped.

(5) Blow out the refrigerant pipe:

Blowing out the refrigerant pipeline is the best way to remove the waste in the pipeline. The specific method is to connect the pressure regulating valve of the nitrogen cylinder with the air inlet of the outdoor unit and block the interfaces of all indoor units with blind plugs. An indoor machine interface is used as a sewage outlet, with insulating material facing the nozzle and a pressure regulating valve of 5kg/ cm? Fill the pipe with air, and quickly release the insulation when the hand can't reach it. Dirt and moisture will be discharged together with nitrogen. This cycle is repeated several times until no dirt and moisture are discharged (every indoor unit should do this).

In addition, the liquid tube and trachea should be carried out separately.

(6) Brazing of refrigerant pipe:

A. Preparation of refrigerant pipeline before brazing: quality standard of brazing tape and preparation of welding equipment. The cut surface of copper tube should be smooth, without burr, back protrusion and other defects. The section is allowed to be inclined, and the deviation is 1% of the pipe diameter.

B. The brazing of refrigerant pipes shall adopt phosphor copper covered electrode or silver covered electrode, and the welding temperature shall be 700-845℃. Brazing is easy to be carried out downward or horizontally, overhead welding should be avoided as far as possible, and the branch opening of the joint must be kept horizontal.

C the spacing standard of horizontal pipe (copper pipe) supports is as follows:

Below nominal φ20 φ 25-40 φ 50

Diaphragm (m) 1.0 1.5 2.0

Note: Copper tubes should not be clamped by metal brackets, but should be supported by insulating layers in natural state to prevent cold bridge.

D. Welding personnel shall hold necessary qualification certificates before taking up their posts.

E. When welding the operating valve of gas pipeline, it must be cooled (wrap the valve body with wet cloth), otherwise it will lead to leakage.

(7) Copper pipes with a diameter less than φ 19.05mm shall be simmered, hot bent or cold bent on site with special bending tools, and the ellipticity shall not be greater than 8%. The bending radius, spacing, slope direction and inclination of pipes installed side by side should be the same. For copper pipes larger than φ 19.05 mm, stamping elbows should be used.

(8) Flared connection:

The connection between refrigerant copper tube and indoor unit adopts bell mouth connection, and the expansion quality of bell mouth should be paid attention to. Among them, the flare depth of the bell mouth should not be less than the pipe diameter, and the flare direction should conform to the refrigerant flow direction. When cutting pipes, use a cutter. When flaring and locking the nut, apply a small amount of refrigerant oil to the inner surface of the flaring. The flare size and nut torque are shown in the following table:

Size and torque of copper tube flare with nominal diameter and outer diameter (kgf-cm)

1/4 Φ6.35 9. 1-9.5 140- 180

3/8 Φ9.52 12.2- 12.8 340-420

1/2 Φ 12.7 15.6- 16.2 340-420

5/8 Φ 15.88 18.8- 19.4 680-820

3/4 Φ 19.05 23. 1-23.7 1000- 1200

4, all refrigerant pipe insulation pipe must be bandaged, steel casing should be used when crossing the floor.

5. Installation of drainage pipe: PVC or PPR engineering plastic pipe is used for drainage pipe;

(1) Steps: connect water pipes → lay heating wires → check water leakage → keep warm.

(2) Before the pipeline installation, the dirt and corrosion in the pipeline must be removed, and the pipeline opening shall be closed for protection when the installation is suspended.

(3) The shorter the effective distance of the drainage pipe in the warehouse, the better. The gradient of horizontal pipeline shall be1100 to 1/50.

(4) It is best to make a soft connection between the drain of the machine tray and the drain pipe in the warehouse. The drain of the condensed water tray in the warehouse should be higher than the drain pipe interface, and the PVC pipes should be connected with special PVC glue. Water filling test can be used for leakage test of drainage system, and no leakage is qualified.

(5) After the pipeline is installed, the system shall be flushed, and the system shall be cleaned before connection.

6, control line operation:

The control lines are all bundled and laid along the refrigerant pipe with shielded wires, and the indoor controller is partially hidden through the pipe. It is forbidden to bind the power cord and the control cord together to prevent interference.

7, heat preservation work:

Materials should be selected according to the design requirements of thermal insulation engineering. During construction, the insulation sleeve should be put on together, and welding joints should be reserved. Finally, the welded joint should be treated. It is absolutely forbidden to break the insulation layer during construction, and the lap joint of insulation sleeve must be tied with tape.

8, outside the library unit installation:

(1) The unit equipment is delivered out of the warehouse for unpacking inspection, and the inspection information is filled in the Equipment Unpacking Inspection Record;

(2) Handling and hoisting of units and equipment outside the warehouse;

(3) The unit outside the warehouse is located on the roof foundation (civil cooperation), and the unit and the foundation are fixed by ground anchor or bracket. Between outdoor unit and indoor unit, between outdoor unit and building, it should be carried out in accordance with relevant technical regulations.

9, air tightness test:

(1) Operation sequence: refrigerant piping is completed → nitrogen pressurization → time control → pressure inspection → qualified.

(2) The organization and division of labor of testers.

(3) Key points: The refrigerant pipeline should be pressurized with dry nitrogen, and the pressure test should be carried out slowly:

The first stage: 3.0 kg/ cm? Pressurize for more than 3 minutes;

The second stage: 15 kg/ cm? Pressurize for more than 3 minutes;

The third stage: 30 kg/cm? Pressurize for 24 hours

Observe whether the pressure drops. If there is no drop, it is qualified, but the pressure will change with the change of temperature. The pressure will be 0.65438 0 kg/cm for every change of 65438 0℃. Change, so to modify. Check whether there is any leakage. You can check the leakage by sensing, hearing and soapy water. After the nitrogen pressure test is completed, release nitrogen to 3 kg/ cm. Then R22 was added until the pressure reached 5 kg/ cm? Electronic leak detector for leak detection.

(4) The air tightness test record must be filled in during the test (the written record is clear and the data is true).

10, vacuum drying:

(1) After passing the nitrogen pressure test, vacuum dry the system to meet the quality requirements.

(2) Rotary vacuum pump (displacement of 4l/min) should be selected for vacuum drying, and the vacuumizing capacity of the vacuum pump must reach -755mmHg before use.

(3) In the following order:

(1) Connect the vacuum meter and run the vacuum pump for more than 2 hours (the vacuum degree should be above -755mmHg). If it does not reach -755mmHg, continue pumping 1 hour. If it fails, check for any leaks.

(2) After reaching -755mmHg, it can be placed at 1 hour, and the vacuum gauge is considered qualified if it does not rise. If it rises, it means that there is moisture or air leakage in the system, so we should continue to deal with it.

(3) After passing the vacuum test, fill the refrigerant according to the calculated amount, and open the valve (pay attention to vacuumizing from both sides of the gas pipe and liquid pipe).

(4) Under special circumstances, a special vacuum drying method of nitrogen separation can be adopted.

(4) Record the above test results in relevant tables.

1 1, Freon refrigerant filling:

Refrigerant filling shall be carried out in accordance with the requirements in the technical data.

Three. Main difficulties and solutions in construction

Ensure that the refrigerant pipe is absolutely clean and free of impurities and moisture.

The solutions are as follows: ① The material selection should be strict. ② Copper hoses below φ19.05 should be purchased in bundles to reduce welded joints. (3) Absolute guarantee of nitrogen shielded welding. (4) Blowing pollution meets the requirements. (5) vacuumizing should meet the requirements. ⑥ Freon refrigerant added in the system adopts DuPont of America, Atto of France or domestic famous brands.

Fourth, engineering protection and methods

The protection content is mainly the warehouse body and the units inside and outside the warehouse.

After the library body and the machines in the library are installed, the decorative film is finally removed. Disassembly and assembly shall be carried out after the unit outside the warehouse is in place.

All pipes should be protected by marking ports before being connected to internal and external machines in the warehouse.

The third quarter construction organization and labor plan

1, organization chart

Project manager responsibility system:

Technical person in charge: technical quality group, material and equipment procurement and supply group, and security logistics support group.

Person in charge of construction: equipment hoisting group, pipeline laying and welding group and electric control system installation group.

2, post responsibility system

Project manager:

Entrusted by the legal representative of the company, responsible for this project. According to the authorization, he is responsible for all the construction organization and leadership work and external liaison and coordination work on the construction site, and is the lifelong person in charge of the quality of the construction project.

Technical director:

Coordinate the project manager in charge of technology and quality management, strengthen the management of the whole construction process, and ensure the realization of quality objectives.

Person in charge of construction:

Assist the project manager in daily construction management, and formulate and implement time limit for a project management measures. Ensure the project progress is completed as planned, be responsible for the safety supervision and inspection of the construction site, and lead the site civilization.

Technical quality group:

The formulation of small-scale construction scheme should check the technical and quality problems of construction personnel, find and solve them in time, and organize hidden acceptance, intermediate acceptance and handover acceptance. Organize the equipment and materials to enter the site for unpacking acceptance, supervise and manage the construction team according to the quality objectives, be responsible for the technical disclosure of the construction team, organize the quality self-inspection in the construction process, put forward the self-inspection report and be responsible for the project quality.

Material equipment group:

Responsible for the procurement, storage and distribution of all kinds of self-purchased main materials and consumables, procurement and maintenance of all kinds of construction machinery and equipment, and inventory acceptance of materials.

Safety team: responsible for various safety production measures and safety disclosure for construction personnel entering the site. Check the implementation of security team's work in the construction process, and supervise and manage the actual production process of safety conditions. Responsible for all logistics support work and escort all project construction.

Construction team leaders of various disciplines:

Responsible for the implementation of the construction plan formulated according to the requirements and specifications of the drawings.

Setting of temporary facilities:

After the construction personnel enter the site, they should negotiate with the owner to set up various temporary sites according to the actual situation on site. In order to facilitate engineering construction and improve work efficiency, the setting of temporary facilities should be as economical and reasonable as possible without affecting construction.

The fourth quarter engineering quality management guarantee measures

1, construction progress plan guarantee measures

In the project engineering, our company will appoint a project manager with many years of rich experience and ability and various professional engineering engineers to form the project management department. Construction personnel of various disciplines also choose personnel with rich construction experience. In terms of funds and materials, the company will give the greatest support, the project will be all earmarked, and the project will be equipped with all kinds of construction machinery and equipment with advanced performance. Measuring instruments and equipment, inspection and test equipment.

2. Technical guarantee.

Before construction, make various construction plans and technical disclosure, which are comprehensive and detailed, with charts and illustrations. Do actively mobilize the enthusiasm of the operation layer to learn the construction scheme, and adopt the construction method of combining running water construction with parallel construction in the construction. Various advanced construction technologies and techniques are adopted to compress and adjust the construction period of a running water section to ensure that the whole construction period can be shortened.

3, building materials and equipment admission plan

The mobilization time of materials and equipment during construction shall be put forward in advance by the relevant personnel of the project management department according to the construction plan and the actual situation on site. So that material procurement personnel or equipment suppliers can get ready to transport spare materials to the site to ensure smooth and timely completion.

The construction team leader must lead the team to do the following work: adhere to the construction according to the drawings, strictly implement the acceptance specifications and quality inspection and evaluation standards for unified construction, and take effective measures to remedy the quality problems found, leaving no future troubles. Do a good job in quality inspection of each working procedure and make records. If the previous procedure is unqualified, the next procedure cannot be constructed, and the quality should be strictly controlled. All employees participate in quality management, and each employee should guarantee and be responsible for the quality of his work. All testing tools under construction must be inspected, tested and measured before construction, and measuring tools and measuring instruments that have not been measured shall not be brought into the site. Strict quality inspection system, one-vote rejection of quality and punishment for common quality defects, establishment of quality assurance system headed by project manager, improvement of various rules and regulations, materials must be accepted by professional engineers and material clerks, and unqualified materials are not allowed to enter the construction site. After the materials enter the site, they should be carefully kept to avoid unnecessary damage. If unqualified materials are found in the construction process, construction personnel are prohibited from using them. Construction personnel at all levels shall strictly implement the established installation quality standards, and shall not lower the installation quality standards without the permission of the project manager. Pay attention to the acceptance of concealed works. Before concealment, it must be signed by the owner, supervisor and professional engineer. Strengthen group activities, carry out quality competition activities, regularly carry out technical quality training for various types of work, and improve the technical level of construction personnel.

Section 5 Construction Safety Assurance Measures

1, management target

(1) During the construction process, always implement the policy of "safety first, prevention first", conscientiously implement the regulations of the State Council, Ministry of Construction and construction enterprises on safety production management, incorporate safety production work into the construction organization design and construction organization design, and closely combine safety production work with production tasks to ensure the safety and health of construction workers in the production process, prevent all kinds of accidents and promote production with safety.

(2) Strengthen the management of production safety, put an end to fatal accidents and ensure that there are no major industrial accidents through organizing implementation, assigning responsibilities to people, regular inspection and serious rectification.

2. Management organization

(1) Establish a "Safety Production Management Committee" headed by the person in charge of safety production in the project management department and attended by the person in charge of safety production in all construction units to organize and lead the safety production management in the construction site.

(2) The main person in charge of the project intends to sign the responsibility form for production safety with the person in charge of each construction unit, so that the responsibility for production safety is from person to person and from layer to layer.

3. Management system

(1) A meeting of "Safety Production Management Committee" should be set up for each project, so that there should be mobilization before the project, implementation during the project and summary after the project.

(2) When organizing the construction, it is necessary to ensure that the construction personnel of this project team are on duty, and the project leader must be on duty at the scene, and the vacant posts are not allowed to get out of control.

(3) Strictly implement the technical scheme and measures of safety production management on the construction site, and report to the relevant departments in time when problems are found in the implementation. When changing the scheme and measures, it shall be implemented after being approved and signed by the leader of the competent technical department of the original design scheme, otherwise no one may change the scheme and measures without authorization.

(4) Establish and implement the technical disclosure system for production safety. It is required that all construction projects must have written safety technical disclosure, which must be targeted and signed by the disclosure person and the disclosure person.

(5) Establish and implement the safety production inspection system. Project intends to organize a joint inspection every six months attended by the person in charge of production safety of each construction unit. If major unsafe hidden dangers are found, the inspection team has the right to issue shutdown instructions, and construction can only be started after the hidden dangers are eliminated and approved by the inspection team.

(6) Establish an acceptance system for mechanical equipment, temporary electricity facilities and all kinds of scaffolding projects that have not been erected. It is strictly prohibited to use without acceptance and unqualified acceptance.

4. Behavior control

(1) Personnel entering the construction site must wear safety clothes, otherwise it will be considered illegal.

(2) Where aerial work with reliable protection design cannot be taken over 2m, you must wear your seat belt. Seat belts should be hung high and used low, not hung high and used low. Avoid swinging and collision during operation to avoid accidents.

(3) All special type of work personnel involved in site construction must hold relevant certificates, and submit a copy of the certificate to the Safety and Civilization Department of the Project Management Department for the record.

Section VI, Labor and Employment Management

1. All construction personnel must receive safety education in refrigeration construction, and can only work at their posts after passing the examination. Without the safety education of refrigeration construction or failing the examination, it is forbidden to work at his post.

2. Before going to work every day, the team leader must call all employees under his jurisdiction. According to the task of the day, combined with the content of safety technical disclosure, working environment, facilities and equipment conditions, the technical quality, safety awareness, self-protection awareness and state of mind of team members, the specific precautions for pre-shift safety activities are put forward in a targeted manner, followed up and implemented, and the activities should be recorded.

3. Strengthen the management of outsourced construction personnel. Employment procedures must be complete and effective. Private recruitment and indiscriminate employment are strictly prohibited and illegal employment is put an end to.

Section 7 Management of Temporary Electricity Consumption

1. Establish an on-site temporary electricity utilization inspection system, conduct regular inspections and irregular spot checks on various lines and facilities on site in accordance with the on-site temporary electricity utilization management regulations, and archive the inspection and spot check records.

2. Ensure the power supply at the site. Temporary distribution lines must be erected in a standardized way, and overhead lines must be insulated wires. Plastic cords are not allowed to be used, and they may not be laid overhead in bundles or along the ground.

3. Construction machinery, vehicles and personnel should keep a safe distance from internal and external power lines. When the minimum distance specified in the specification cannot be reached, reliable protection measures must be taken.

Section 8. Other management and technical measures

1. Construction measures in rainy season

(1) The equipment and materials on site must be avoided in low-lying areas and overhead.

(2) Rain-proof measures should be taken for reserved holes of equipment.

(3) Do a good job in fire prevention, anti-skid, anti-freezing, typhoon prevention and gas poisoning prevention during construction.

(4) Outdoor works should be arranged before the rainy season to avoid construction under unfavorable conditions.

2. Civilized construction management measures

(1) On-site civilized construction management must implement the relevant regulations issued by superiors, with each person in charge focusing on the construction site, the builder responsible for the division of labor, and one person in charge of civilized construction on the construction site.

(2) The area around the site should be clean and tidy, and the working feet should be clear. After living, crushing and heat preservation, it should be cleaned at any time, and the waste should be dumped at the designated place.

(3) The last working procedure must create favorable conditions for the next working procedure and take the initiative to do a good job in equipment.

(4) The finished products stacked at the site shall be neat in materials and will not affect the landscape.

3. Protective measures for finished products and equipment parts

(1) Construction personnel should seriously abide by the on-site finished product protection system and pay attention to the protection of decoration, finished equipment, machines and tools, equipment and facilities in the building.

(2) After unpacking inspection of the equipment, a special person shall be appointed to be responsible for the easily lost and worn parts, and the keys of the garage door and electrical cabinet shall be properly kept. Do not unpack the library lamp and socket before installation. The exposed surfaces during equipment handling should avoid collision.

(3) When hoisting the unit equipment, the hoisting transportation scheme shall be determined, and the hoisting shall be carried out according to the product hoisting points. Special circumstances can invite professional companies and construction teams to participate.

4. Site material supply and management measures

(1) There are sites and warehouses suitable for this project, which are convenient for stacking and storage.

(2) On-site equipment, materials and processed parts shall be received, viewed and dispatched by professionals according to the construction progress.

(3) All kinds of materials in the storage yard in the warehouse should be neatly arranged according to the specifications and models.

(4) Strengthen the management of construction team and materials, prevent the loss of materials and spare parts, and recycle waste materials in time.

5. Technical measures to reduce costs

Construction personnel must be fully familiar with the characteristics, construction scope and technological process of the project, and recheck the marked size and location. Make full preparations for construction, and strive to reduce costs and increase benefits on the premise of ensuring quality.

(1) Reasonable arrangement of construction progress and operation plan, balanced arrangement of labor force, and prevention of slowdown.

(2) Arrange the construction sequence reasonably, do a good job of coordination, and put an end to unnecessary rework. Strict quality control, careful operation, reasonable materials, reduce costs. Improve the utilization rate and save labor, materials and time.

Section 9, Debugging, Arrangement and Acceptance

1, trial run:

(1) The commissioning shall be carried out after the system blowdown, air tightness test, vacuum pumping and freon filling are completed and meet the requirements, all records are complete and verified and signed by the project supervisor.

(2) Before electrifying, be sure to use a multimeter to measure the resistance value between A and B in the electric cabinet of any machine.

(3) Due to various types of equipment, each unit shall be debugged and tested during debugging, and the debugging record shall be submitted to the acceptance unit.

(4) Before each debugging, first check whether the fasteners of the equipment are fastened, and the instruments and electrical equipment shall be qualified for debugging.

(5) Each commissioning machine is qualified if it runs continuously for 8 hours.

2. Completion acceptance and handover acceptance:

(1) documents that should be available before the completion acceptance;

(2) Visual inspection;

(3) Joint debugging;

(4) After the adjustment of comprehensive efficiency test measurement, fill in the debugging data table (attached table), conduct the completion acceptance after all indicators meet the design requirements, and archive the completion operation data table.

(5) Training the owners and users on relevant operation knowledge.

Section 10, After-sales Service Measures and Warranty Commitment

Our company promises to implement the following after-sales service terms for the goods provided by this project:

1. Provide details at random:

① Installation instructions

② "instruction manual"

③ Warranty certificate

(4) Certificate

2. Organize a construction team with rich construction experience to be responsible for the specific construction of this project, ensure the installation quality and system function, and ensure the smooth, efficient and reliable operation of the air conditioning system.

3. Provide debugging of the cold storage system of this project free of charge (debugging requires normal power supply and normal debugging conditions of your company).

4. Provide corresponding free technical training.

Free on-site training:

A. precautions for use;

B, general fault maintenance.

5. Warranty scope:

① Commitment to the system equipment (including related accessories) provided by us in this project: the warranty period of the whole machine is 12 months, and the warranty period of the main component, namely the compressor, is 1.5 years;

(2) During the warranty period, if the system fails due to non-human factors, we will be responsible for free maintenance; At the same time, it is responsible for providing free maintenance service for the equipment twice a year during the warranty period of the whole machine;

(3) Provide free service due to improper use during the warranty period or failure outside the warranty period, and only charge the cost of replacing parts.

6. Cold storage maintenance and information processing methods:

Our company has established a perfect information processing technology platform for each cold storage project, and carried out regular, fixed-point and special-person inspection, maintenance and maintenance according to technical requirements.

All cold storage projects undertaken or maintained by our company enjoy the honorary status of lifelong customers. Enjoy all free consultation, training and maintenance services within the scope of customer projects.

Our company has set up a 24-hour service hotline.

The company's independent website provides all-round volunteer service for customers.