Differential pressure control in clean room

Differential pressure control in clean room

In order to maintain the cleanliness of the clean room from the contamination or contamination of the adjacent room, maintaining a certain air pressure higher than or lower than the adjacent room in the room is an important feature of the clean room different from the general air-conditioned room , is also an important part of the principle of the clean room; clean room to the adjacent environment...

Text label: clean room engineering, clean room differential pressure control, clean room design and decoration

Differential pressure control in clean room

In order to maintain the cleanliness of the clean room from the contamination or contamination of the adjacent room, maintaining a certain air pressure higher than or lower than the adjacent room in the room is an important feature of the clean room different from the general air-conditioned clean room modular , is also an important part of the principle of the clean room; it is common for the clean room to maintain positive pressure to the adjacent environment, both industrial clean rooms and general biological clean rooms, only special biological clean rooms need to maintain negative pressure. Generally, the static pressure difference has two functions: when the doors and windows are closed, the pollutants outside the clean room are prevented from infiltrating the clean room through the gap; when the door is opened, there is enough airflow to flow outward, and the door opening and people entering are minimized. The air flow brought in instantaneously, and when the door is open, ensure that the air flow direction is outward, so as to reduce the pollution brought in to a minimum.

It is not that the greater the pressure difference, the greater the ability to block the penetration of pollution. Research shows that the pressure difference from 0-6pa, the blocking effect changes greatly; from 6-30pa, the blocking effect changes very little; the positive pressure air volume is the fresh air volume The choice of the difference value from the exhaust air volume is the focus of designers, and its value is affected by the air tightness of the enclosure structure, the size and length of the gaps in doors and windows, and the characteristics of pollutant intrusion during the dynamic process of opening and closing doors; The anti-interference ability of the one-way flow clean room is extremely strong, and its self-cleaning time is extremely short. However, for a clean room with a cleanliness level of 5 and above, the positive pressure must satisfy the indoor cleanliness level at a distance of 0.6m from the door when the door is opened, which means that the positive pressure must maintain instantaneous intrusion airflow. Do not go deeper than 0.6m from the door. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops, with professional technology, rich experience and affordable prices.

The number of staff in the clean clean room modular should be strictly controlled to a minimum number. Unrelated people and items cannot enter. The staff do not wear watches and jewelry, and cannot use cosmetics that emit particles. Staff and maintenance managers should strictly enforce personal safety regulations when entering the clean room. Purification procedures, the clothing worn by personnel in different cleanliness work areas should have different cleanliness grades and colors, and work clothes should be cleaned regularly; items entering the pharma clean room should be scrubbed, dusted, disinfected and other necessary purification treatments; clean staff should develop good habits and conduct regular physical examinations. Purification systems and equipment, and indoor cleanliness should be regularly tested; staff should be familiar with the location and use of clean room safety doors, safety passages, and fire-fighting equipment. In many pharma clean room changing room facilities, the changing area is divided into two areas. In some facilities, the two areas can be stored in the same clean room modular space, separated by an imaginary boundary. The initial area includes gloves and soft hats. , shoe covers, since the outer surface of the clean clothes should be kept as clean as possible, care should be taken that hands, hair, and daily footwear should not touch the outside of the clean clothes. Before entering the second area of u200bu200bthe dressing area, dressing gloves, hood, shoes sets achieve this.

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