Lab layout problem
Release time:2021-11-02 09:56:46
Problems with the laboratory layout:
Too cumbersome layout can only increase the inconvenience in use, and it can’t really make much practical effect; copying the simple laboratory layout abroad is not in line with China’s environmental characteristics and management level. Some practical projects have increased the initial investment and management difficulty due to unreasonable layout, and some have affected the cleanliness of the air in the laboratory. Therefore, a sound and reasonable layout is very important, which requires owners and designers to have a full understanding of biosafety and full communication with each other.
Air conditioning ventilation system:
(1) Some designers are unclear about the concept of biosafety, resulting in unreasonable airflow organization in the biosafety laboratory and excessive dead space. The biosafety laboratory requires that the airflow must flow from the clean area to the contaminated area. The position of the indoor air supply and exhaust vents should minimize the space where the airflow is stagnant, and the indoor air vents should be placed in the most dangerous area, arranged on one side. There are obstacles. Some engineering air outlets blow against the biosafety cabinet, and the airflow and the protective airflow of the biological safety cabinet working window interfere with each other, which increases the leakage of the causative factors.
(2) Poor sealing performance, including the sealing of the laboratory envelope and the sealing of the air conditioning ventilation duct. The poor sealing performance of the retaining structure is mainly in the door and window parts, and some joints of the partition wall have poor sealing performance; the manufacturing process of the air conditioning ventilation duct does not meet the requirements, and the sealing material is unqualified. These are contrary to the basic principles of high biosafety laboratories requiring good sealing.
(3) The installation position of the filter of the exhaust system is unreasonable. The high-efficiency filter is installed at the positive pressure end of the exhaust fan, which cannot meet the requirement of negative pressure for the polluted exhaust section.
(4) Exhaust system does not add high-efficiency filters, but uses high-altitude emissions, which is not allowed. Some design or construction units have problems understanding high-speed emissions. They believe that high-speed discharge means that the wind speed in the exhaust pipe should exceed 13 m/s. As a result, the exhaust resistance is large, and the required exhaust air volume is not achieved. It is difficult to maintain indoors. The required negative pressure. Or the exhaust fan head is enlarged, and the noise and power consumption are also increased. Some projects have caused conflicts with surrounding residents due to excessive exhaust noise.
(5) High-efficiency filter replacement and leak detection problems, especially exhaust high-efficiency filters. Exhaust air-efficient filters must be sterilized prior to replacement. Disinfection must be considered during design and installation, and replacement is easy. In order to ensure environmental safety, the exhaust air efficient filter should also consider the possibility of leak detection, or take other measures to ensure that it does not leak. Many P3 laboratories in China have not done this.
(6) Indoor installation of split air conditioner or vertical cabinet air conditioner, which is not allowed in the biological clean room, because the heat exchanger in the air conditioner is actually a microbial growth device, which seriously pollutes the laboratory environment. Some construction units do not install split air conditioners or cabinet air conditioners in the laboratory, but install them in adjacent rooms and use air ducts for air supply. However, because high-level biosafety laboratories must use DC wind, the heat exchangers of ordinary air conditioners are designed according to indoor circulating winds, which can not meet the large turbulence requirements of DC winds. In addition, in order to reduce the cost, the equipment capacity is not rich. The required indoor temperature is not reached at all. Experiments in high-level biosafety laboratories require special protective clothing and sometimes multiple layers. If the temperature is not met, the experimenter’s feelings can be imagined.
In addition, there are even more ridiculous examples, such as the establishment of a three-level biosafety laboratory into a positive pressure laboratory, the installation of fire dampers not in accordance with the regulations, the use of a purification workbench to replace the biological safety cabinet, the exhaust of the safety cabinet Instead of room exhaust, etc., these are serious mistakes. The general purification workbench and the biological safety cabinet work completely differently, and it is very dangerous to protect the human body from microbial infection.
The above are just a few examples, which can be seen in the confusion of the domestic biosafety laboratory construction market. In order to prevent the occurrence of these phenomena, in addition to the formulation of relevant normative standards, the design and construction units have a “law” that can be used, and corresponding management, testing and certification institutions should be established to ensure the quality of the biosafety laboratory.
