Problems in completion acceptance of ventilation and air conditioning engineering

1. The completion acceptance of ventilation and air-conditioning projects is the acceptance process in which the construction unit transfers the qualified sub-projects to the construction unit through the joint trial operation and debugging of the whole sub-project without production load and the inspection of visual quality according to the requirements of this specification, under the premise that the construction quality of the project is effectively monitored.

Note: This article emphasizes the completion acceptance of ventilation and air-conditioning projects as a handover acceptance process. The completion acceptance of ventilation and air-conditioning projects shall be the responsibility of the construction unit, which shall organize the construction, design and supervision units to jointly conduct the acceptance, and the completion acceptance procedures shall be handled after the acceptance is qualified.

(Figure 1: Ventilation and air conditioning engineering)

2. This article stipulates that the completion acceptance of ventilation and air-conditioning projects shall be the responsibility of the construction unit, which shall organize the construction, design, supervision and other units (project) leaders and technical, quality leaders, and supervision engineers to jointly participate in the completion acceptance of this sub-project, and the acceptance procedures shall be handled after the acceptance is qualified.

3. During the completion acceptance of ventilation and air conditioning projects, the completion acceptance materials should be checked, generally including the following documents and records:

• Drawing review records, design change notices and completion drawings:

• Factory acceptance certificates and on-site inspection (test) reports of major materials, equipment, finished products, semi-finished products and instruments:

• Concealed project inspection and acceptance records;

(Figure 2: Ventilation and air conditioning engineering materials and equipment)

• Engineering equipment, duct system, and pipeline system installation and inspection records:

• Pipeline test records;

• Equipment single machine trial operation records;

• System no production load joint trial operation and debugging records:

• Division (sub-division) project quality acceptance records:

• Visual quality comprehensive inspection records;

• Safety and function inspection data verification records

Note: This article stipulates the documents and materials that should be provided for the completion acceptance of ventilation and air conditioning project construction.

(Figure 3: Ventilator, Refrigerator)

4. Visual quality inspection should include the following items:

• The surface of the air duct should be flat and free of damage;

• The connection should be reasonable, and there should be no obvious defects in the connection of the air duct and the connection between the air duct and the equipment or regulating device. The surface of the air outlet should be flat, the color should be consistent, the installation position should be correct, and the adjustable parts of the air outlet should be able to operate normally.

• The production and installation of the regulating device should be correct and firm, flexible to adjust, and easy to operate. Fire and smoke exhaust valves are tightly closed and operate reliably.

• The installation positions of pipes, valves and instruments of refrigeration and water pipe systems are correct, and there is no leakage in the system.

• The support and hanger types, positions and spacing of air ducts, components and pipes shall comply with the requirements of this specification;

• The position of the flexible pipes of air ducts and pipes shall comply with the design requirements, and the pipes shall be correct and firm, without strong twisting:

• The installation of ventilators, refrigerators, water pumps and fan coil units shall be correct and firm:

• The surface of the combined air conditioning unit is flat and smooth, the joints are tight, the assembly sequence is correct, and there is no leakage on the outer surface of the water spray room:

• The dust collector and dust chamber should be firmly installed and the interface is tight;

(Figure 4: Ventilation Engineering Inspection)

• The installation direction of the muffler is correct, and the outer surface should be flat and free of damage;

• The paint of air ducts, components, pipes and brackets should be firmly attached, the paint film thickness should be uniform, and the paint color and markings should meet the design requirements;

• The material and thickness of the insulation layer should meet the design requirements; the surface should be flat, without cracks and shedding; the outdoor moisture-proof layer or protective shell should be overlapped along the water flow without leakage. Inspection quantity: 10% of air ducts and pipelines are randomly inspected by system, and no less than 1 system. 5% of components, valves and instruments are randomly inspected, and no less than 10 pieces. 

Inspection method: measurement and observation inspection.

Note: This article stipulates the appearance inspection items and quality standards of ventilation and air-conditioning projects. Ventilation and air-conditioning projects are sometimes inspected in the form of independent unit projects, or even only a sub-division divided by this specification is regarded as an independent unit project. At that time, the ventilation and air-conditioning project division or sub-division can be regarded as an independent acceptance unit, but there must be complete acceptance materials for the corresponding project content.

5. The visual quality inspection of the purification Air conditioning system should also include the following items:

• The installation position of the air conditioning unit, fan, purification air conditioning unit, Fan Filter Unit and air shower room should be correct, firmly fixed and tightly connected, and the deviation should comply with the relevant provisions of this specification;

• The connection between the high-efficiency filter and the air duct, and the air duct and the equipment should be reliably sealed.

(Figure 5: high efficiency filter)

• The purification air conditioning unit, static pressure box, air duct and return air outlet should be clean and free of dust;

• The inner wall, ceiling and floor of the prefabricated Clean Room should be smooth, flat, uniform in color, dust-free, and the static electricity value of the floor should be low. Design regulations: The connection between the return air outlet, various terminal devices and various pipelines and the inner surface of the clean room should be reliably and tightly sealed.

Inspection quantity: 20%6 of the quantity should be randomly inspected, and no less than 1.

Inspection method: measurement, observation inspection

Note: This article stipulates the appearance inspection items and quality standards that need to be added to the purification air conditioning project.