Check whether there is a device to indicate the pressure difference between neighboring rooms of different air cleanliness levels, and the indicated static pressure difference should be more than 5Pa. Interact with each other.
What is the meaning of static pressure difference between different clean rooms
Clean Room Construction and Acceptance Specification stipulates that the static pressure difference between the clean room and the non-clean room should be more than 5Pa, and the pressure difference between neighboring clean rooms with different levels of air cleanliness should be more than 5Pa. The static pressure difference between the clean room and the outdoor area should be more than 12Pa.
In the Design Code for Clean Plants for Pharmaceutical Industry, it is stipulated that
Different levels of air cleanliness should be able to indicate the pressure difference between different levels of air cleanliness and the air quality between neighboring rooms should be more than 5Pa.
Different levels of clean room and clean room and non-clean room between the pressure difference should not be less than 5Pa, clean room and outdoor static pressure difference should be greater than 10Pa.
"Hospital clean surgical not building design specification" stipulates that
The same level of clean room between the pressure difference should be slightly greater than 0Pa, clean room and non-clean room to be not less than 10Pa between the clean room and the outside. Clean room and outdoor pressure difference should not be less than 15Pa.
"Clean Plant Design Code" and "Electronic Industry Clean Plant Design Code" in the differential pressure requirements with the "Pharmaceutical Industry Clean Plant Design Code" in the requirements are the same.
Is there a differential pressure between high level clean area and low level non-clean area?
There should be a certain pressure difference between the high-level clean area and the low-level clean area and non-clean area.
We know that the airflow is from high pressure to low pressure, so the general clean room (clean room) will generally maintain a slightly positive pressure, so that the clean airflow from the top blowing out, blowing to the personnel, production equipment, and become dirty air, and then flow to the outside. Even if there is an action to open the door, because of the existence of micro-positive pressure, the contaminated air will not flow back.
And two connected clean room (clean room) is easy to produce airflow exchange between the only airflow from the clean level of the room flow to the cleanliness of the room, will not have a negative impact on the cleanliness. Therefore, the pressure difference between rooms with high cleanliness level is greater than that of rooms with low cleanliness level.
If more than one clean room (clean room), should be arranged in accordance with the low level to the high level, the same level of clean room is best together. Clean level of different neighboring rooms static pressure difference is generally greater than 5Pa, clean room (clean room) and the outdoor static pressure difference is greater than 10Pa, the door opening toward the cleanliness level of the room.