According to the purpose, it can be divided into steam pipelines, air pipelines, temperature control pipelines, feeding pipelines, seed transfer pipelines, discharge pipelines and sewage pipelines.

Steam pipelines are mainly used for sterilization and fermentation tank heating, and are divided into purified steam and crude steam pipelines. Purified steam is the steam obtained by filtering crude steam through a steam filter, and is used for air fine filter sterilization.

The rough steam pipelines mainly include the tank bottom steam pipeline, jacket (tube) preheating pipeline, transplanting port steam pipeline, sampling port steam pipeline, etc.

The air pipeline is mainly used for ventilation and cultivation of fermentation tanks. The preliminarily treated air coming out of the air compressor is reduced in pressure by the pressure reducing valve and filtered by the main filter, pre-filter and fine filter before entering the fermentation tank and finally discharged through the exhaust.

The exhaust pipes of several fermentation tanks in a fermentation plant are mostly gathered into a main pipeline to save pipe materials, and the same applies to sewer pipes and sewage pipes.

However, there are drawbacks of mutual connection and mutual interference during use. The contamination of one tank often affects other tanks. The connection of exhaust pipes is particularly unfavorable to the prevention of pollution.

Therefore, the exhaust and drainage pipes should be configured according to the characteristics of fermentation. For occasions prone to bacterial contamination, it is advisable for each fermentation tank to have independent exhaust and drainage pipes.

If a main exhaust pipe is used, a pipe with a larger diameter must be selected to ensure that the exhaust and drainage are unobstructed and do not flow back into the fermentation tank.

The temperature control pipeline is used to control the temperature of the fermentation tank, which is divided into cooling water pipeline and hot water circulation pipeline (industrial fermentation generally has another circulating water pipeline). When the medium uses hot water, it needs to be equipped with corresponding hot water tanks and water pumps.

The feed pipeline is used for feeding the fermentation tank. Generally, it is mainly used for acid, alkali, sugar and defoamer feeding. If ammonia water is added to adjust the pH value, the feed pipeline is connected to the air inlet pipeline (for easy mixing). Others are generally fed from the upper head.

The diameter of the feeding pipeline must be determined according to the feeding speed to ensure that the feeding can be carried out at the required speed.

The transfer pipeline is used for fermentation transfer. It is generally connected to the distribution station and is a set of pipeline systems with high sterilization requirements. For details, please see the introduction in the previous article Industrial Fermentation Transfer: Introduction to Pipeline Systems and Transfer Methods.

The discharge pipeline is used for discharging materials from the fermentation tank. Generally, the pipe diameter is larger, which is convenient for discharging materials in a short time. The sterility requirements after the valve of the discharge pipeline are not high, and it is good to be easy to clean.

The sewage pipeline is used to exhaust steam and water from the fermentation tank valve, discharge steam from the fermentation tank cleaning, and discharge steam from the pipeline sterilization. There are no sterility requirements and the entire piping system has the lowest requirements. Carbon steel pipes should pay attention to acid and alkali corrosion.