Cleanroom construction company shares: GMP sterile workshop layout design points

With the rapid development of industries such as biomedicine, medical devices, and food processing, the demand for the construction of GMP (Good Manufacturing Practice) sterile workshops is increasing. As a professional service provider for cleanroom construction, Shenzhen Huajianjing Construction Engineering Co., Ltd. (referred to as Huajianjing) has summarized the core points of GMP sterile workshop layout design based on years of industry experience. This article will systematically analyze the key technologies of sterile workshop design from the dimensions of functional zoning, personnel and logistics planning, air purification system, equipment selection, and construction technology.

1、 Functional zoning principle of GMP sterile workshop

The layout of GMP sterile workshop must strictly follow the requirements; Separation of clean and dirty water; The principle is to achieve controllability of the production process through reasonable functional zoning. In design practice, Huajianjing usually divides the workshop into the following core areas:

1.Clean area (Class A/B/C/D) : According to production process requirements, the clean area needs to meet different levels of air cleanliness standards. For example, Class A areas (high-risk operation areas) need to maintain a unidirectional air environment, and the concentration of suspended particles needs to be controlled at 3520 particles per meter; （≥0.5μm）； Class D zones allow non unidirectional flow, but maintain basic cleanliness through efficient filters.

2.quasi clean area : including auxiliary areas such as material storage and equipment cleaning, with a lower cleanliness requirement than the core production area, but needs to be isolated from the clean area through a buffer room to prevent cross contamination.

3.General production area : Used for non sterile operations such as packaging and outer packaging, it needs to be physically isolated from the clean area and controlled for personnel/material entry and exit through an airlock.

Hua Jianjing emphasized that the boundaries of functional zones need to be clearly defined through physical partitions (such as color steel plates and glass windows), and at the same time, combined with pressure gradient design (usually maintaining a positive pressure of 10Pa for adjacent areas in clean areas), to form an effective air barrier.

2、 Dynamic Planning of People Flow and Logistics

The flow path of personnel and materials is one of the core challenges in the design of GMP sterile workshops. Huajianjing passed; Unidirectional flow, avoiding backflow; The principle is to construct the following path system:

1.Personnel path :

• Changing system: Set up multi-level changing rooms (such as first shift, second shift, airlock room), gradually reduce the microbial load carried by personnel through graded shoe changing, changing clothes, hand washing and disinfection steps.
• Buffer room design: Install a well sealed buffer room at the entrance of the clean area, coupled with an interlocking door system, to ensure that personnel entering and exiting will not disrupt the pressure balance of the clean area.

2.Material Path :

• Material transfer: Use transfer windows or automatic logistics systems (such as AGV carts) to avoid materials directly crossing the boundaries of the clean area.
• Waste disposal: Set up independent waste outlets and isolate pollution risks outside the production area through negative pressure air locks.

The Huajianjing case shows that a biopharmaceutical project has reduced the risk of cross contamination by 60% and improved production efficiency by 15% by optimizing the flow of people and logistics.

3、 Collaborative design of air purification system

The air purification system is a GMP sterile workshop; Heart” Its design needs to be deeply coordinated with the architectural layout. Huajianjing adopts the following technical solutions:

1.Air supply system :

• High efficiency filter (HEPA) layout: FFUs (fan filter units) or air outlets are evenly distributed on the ceiling of the clean area to ensure one-way flow covers the entire operating surface.
• Wind speed control: The wind speed in Class A area needs to be maintained at 0.36-0.54m/s, and dynamic adjustment is achieved through variable frequency fans.

2.Return air system

• Return air outlet position: Avoid directly below the control panel to prevent airflow short circuits.
• Exhaust treatment: Install HEPA filtration or chemical filtration devices for processes that generate pollution (such as sterilization cabinet exhaust).

3.Temperature and humidity control :

• The temperature in the clean area is usually controlled between 18-26 ℃, with a relative humidity of 45% -65%, and zone control is achieved through a precision air conditioning system.

Huajianjing optimized airflow organization through CFD (Computational Fluid Dynamics) simulation in a vaccine production project, resulting in a 40% increase in particle concentration uniformity in the clean area.

IV. Design of Equipment and Process Adaptability

The equipment selection for GMP sterile workshops should take into account both production and cleanliness requirements:

1.Equipment material : 316L stainless steel, PTFE and other corrosion-resistant and easy to clean materials are preferred, with a surface roughness Ra≤ 0.8μm。

2.Equipment layout :

• Avoid dead corners: Keep a distance of 30cm between the equipment and the wall or floor for easy cleaning and disinfection.
• Pipeline concealment: Embed process pipelines (such as steam and compressed air) into the interlayer to reduce ground openings.

3.Automation integration : By using technologies such as isolators and RABS (Restricted Access Barrier Systems), direct contact between personnel and products is reduced, thereby lowering the risk of contamination.

V. Construction Technology and Verification Points

Huajianjing strictly follows the following specifications during the construction phase:

1.Sealing treatment :

• Thecolor steel plate joint is sealed with neutral silicone, with a gap width of 0.5mm.
• The doors and windows are designed to be airtight, with a leakage rate of 0.5% of the total air volume.

2.Verification process :

• Static verification: Check whether parameters such as suspended particles, microorganisms, and wind speed meet the standards.
• Dynamic verification: Simulate actual production scenarios to verify the impact of personnel operations on cleanliness.

3.Maintainable design

• Set up maintenance access: Reserve sufficient space in the mezzanine and technical aisle for later maintenance.
• Identification System: Distinguish different clean level areas through color code management.

VI. Differentiation advantages of Huajianjing

As a leading clean engineering service provider in Shenzhen, Huajianjing has formed three core competencies in the GMP sterile workshop field:

1.Full process service : Provides one-stop service from scheme design, construction and installation to verification and certification.

2.Customization capability : Develop modular clean units for special scenarios such as biosafety laboratories and cell therapy workshops.

3.Digital management : Implementing 3D collaborative design through BIM technology to reduce construction error rates.

Conclusion

The layout design of GMP sterile workshop is the material basis of quality management system, and its scientificity directly affects the product qualification rate and enterprise compliance cost. Huajianjing has completed over 500000 square meters of clean engineering through continuous technological innovation, helping customers obtain international certifications such as FDA and EU GMP. In the future, the company will continue to deepen its exploration in the fields of intelligent clean technology and energy conservation and environmental protection, providing more efficient solutions for the life science industry.

(The data in this article refers to the "Good Manufacturing Practice for Drugs (Revised in 2010)" and the ISO 14644 series of standards)