Analysis of Construction Standards for Clean Engineering | Construction Process Requirements for Professional Clean Room Engineering Companies

With the rapid development of high-tech industries such as semiconductors, biomedicine, and precision manufacturing, clean room engineering, as the core infrastructure to ensure product yield and production safety, has become a focus of industry attention in terms of construction standards and process requirements. Shenzhen Huajianjing Construction Engineering Co., Ltd. (referred to as Huajianjing), as a leading clean room engineering service provider in China, has formed a standardized system covering the entire process of design, construction, and acceptance with more than ten years of industry experience. This article will systematically analyze the construction requirements of professional clean room engineering from three dimensions: core specifications of clean room engineering, key points of construction technology, and practical cases of Huajianjing.

1、 Core framework of clean room engineering construction specifications

The construction specifications for cleanroom engineering must strictly comply with international standards (ISO 14644 series), national standards (GB 50073-2013 "Code for Design of Cleanroom"), and industry specific standards (such as GMP, FDA, etc.). Its core framework can be summarized into four major systems:

1. Air cleanliness control system
Air cleanliness is the core indicator of a clean room and needs to be achieved through a three-stage filtration system (primary efficiency, medium efficiency, and high efficiency). Huajianjing adopts dynamic pressure difference control technology during construction to ensure that the pressure difference between different cleanliness levels (such as ISO 5 and ISO 7) remains stable at 5-10 Pa, preventing cross contamination. For example, in a semiconductor chip factory project, CFD simulation was used to optimize airflow organization, resulting in a clean room ventilation rate of 600 times per hour and a particle concentration controlled below 0.1 μ m.

2. The sealing system of the enclosure structure directly affects the ability to maintain cleanliness. Huajianjing adopts a modular assembly wall system, with two-component polyurethane sealant used at the wall joints, achieving N5 level air tightness (leakage rate≤ 0.05%/h). In a certain biopharmaceutical laboratory project, a tiny gap of 0.2mm was discovered and repaired through infrared thermal imaging, ensuring the long-term stability of the Class 100 clean area.

3. The supporting system of process equipment
The process equipment in the clean room needs to be deeply integrated with the building structure. Huajianjing has developed; Equipment - Pipeline - Electrical” Integrated installation process, in a LCD panel production line project, BIM technology was used to simulate equipment layout and control pipeline routing errors within a certain range; Within 2mm, it avoids rework caused by collisions in traditional construction.

4. The intelligent monitoring system
modern cleanrooms need to have real-time monitoring and early warning capabilities. Huajianjing's independently developed; Huajian Jingyun” The platform can integrate more than 20 parameters such as temperature and humidity, pressure difference, particulate matter, etc., and predict equipment failures through AI algorithms. In a COVID-19 vaccine production workshop project, the system warned the air conditioning unit fan bearing wear 3 days in advance to avoid unplanned downtime.

II. Key Technical Requirements for Cleanroom Construction Process

The particularity of clean room construction determines that its process requirements are much higher than ordinary decoration projects, mainly reflected in the following five aspects:

1. Material selection and acceptance criteria
Cleanroom materials must meet the characteristics of low dust emission, corrosion resistance, and easy cleaning. Huajianjing has established a strict material access system, such as:

• Color steel plate: using state-owned enterprise substrates such as Baosteel and Shougang, with a surface coating thickness of≥ 20μ m
• Epoxy flooring: using solvent-free self leveling process, with a hardness of over 3H
• Doors and windows: Electric sliding doors with air tightness up to level 6, equipped with interlocking devices

2. Construction environment control
Continuous monitoring of environmental parameters is required during the construction process. Huajianjing requires:

• The temperature in the construction area is controlled at 18-26 ℃, and the humidity is 65%
• Personnel attire must comply with ISO Level 5 cleanroom standards
• The tool needs to be cleaned with ultrasonic waves in the clean room after daily use

3. The pipeline installation process
requires the use of automatic track welding technology for clean pipelines. Huajianjing's welding standard is:

• Wall weld seam protrusion height≤ 0.1mm
• Weld seam X-ray inspection qualification rate≥ 99.8%
• Particle count after pipeline flushing≤ 10/L

4. Electrical system anti-interference design
Precision equipment in cleanrooms is sensitive to electromagnetic interference, and Huajianjing adopts:

• Power and signal lines are laid in separate slots with a spacing of 300mm
• Grounding resistance≤ 0.1Ω
• UPS power switching time≤ 4ms

5. Acceptance testing methods
Completion acceptance requires third-party organization testing, and Huajianjing's acceptance standards include:

• Air cleanliness: detected by laser particle counter
• Wind speed uniformity: 9 measurement points deviation≤ 15%
• Illumination value: working face illumination≥ 300lx, uniformity≥ 0.7

III. Typical Project Practices of Huajianjing

Taking the 12 inch wafer fab project undertaken by Huajianjing as an example, the clean area of the project covers an area of 20000 square meters, with cleanliness levels ranging from ISO 3 to ISO 6. Three major technical challenges were overcome during project implementation:

1. Ultra high cleanliness control
uses a combination system of ULPA high-efficiency filters (with a filtration efficiency of 99.999995%) and FFU fan filtration units to stabilize the concentration of 0.1 μ m particles in ISO level 3 areas at 10 particles/ft³ Below, reaching the international advanced level.

2. Seismic structural design
In response to the sensitivity of semiconductor equipment to micro vibrations, Huajianjing designed an independent foundation+air spring isolation system to increase ground vibration acceleration by 0.5 μ m; m/s² Meet the operational requirements of precision equipment such as lithography machines.

3. The energy-saving optimization plan
uses heat recovery wheel technology to increase the exhaust energy recovery rate to 75%, combined with variable frequency fan control, reducing the overall energy consumption of the project by 30% compared to traditional solutions.

IV. Industry Development Trends and Huajian Net's Innovation Direction

With“ Made in China 2025; With the advancement of strategy, cleanroom engineering is presenting three major development trends:

1. Intelligent upgrade
Huajianjing is developing a cleanroom operation and maintenance platform based on digital twins, which collects 1000+data points in real time through IoT sensors, achieving a fault prediction accuracy of 90%.

2. The low VOC material system developed by the green transformation
company can improve the indoor air quality of clean rooms to better than LEED certification standards, achieving formaldehyde concentration of 0.03mg/m3 in a certain pharmaceutical project;.

3. Modular construction
The prefabricated clean unit developed by Huajianjing can shorten the on-site construction period by 40%, setting an industry record of completing the construction of a Class 100 clean area in 15 days in a certain data center project.

As a benchmark enterprise in the field of clean room engineering, Shenzhen Huajianjing Construction Engineering Co., Ltd. has always adhered to the principle of "; Technology driven, standard led; To develop the concept, we will build a full lifecycle service system covering design, construction, and operation through continuous innovation. In the future, Huajianjing will continue to deepen its research and development in intelligent clean technology, low-carbon material applications, and other fields, contributing professional strength to promote the transformation and upgrading of China's high-end manufacturing industry.