Problems in completion acceptance of ventilation and air conditioning engineering

Completion Acceptance Process of Ventilation and Air-Conditioning Projects

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.

Figure 1: Ventilation and air conditioning engineering

Acceptance Responsibility and Procedures

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.

Required Acceptance Documentation

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

Figure 3: Ventilator, Refrigerator

Visual Quality Inspection Requirements

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, 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.

Purification System Additional Requirements

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.