Regarding the immersion cooling cycle system, to ensure the cleanliness of the entire cycle system, it is recommended to first ensure the cleanliness of finished products of various key components, including circulating pumps, Tank, radiators, prefabricated pipeline and pipes, and the like. Secondly, when designing the cycle system, it is recommended that a main pipeline system reserve a bypass to connect an additional cycle system cleaning apparatus with a pressure boosting function, which is equipped with a fine filter of 5 μm or more.

Before assembling a cycle system, all components in the cycle system must be confirmed to be clean. If the components are not clean enough, clean them before installing the cycle system.

During an installation process of each component in the cycle system, cleanliness inside the devices must also be ensured, including pipeline, pipes, Tank and radiators. For example, when installing a certain pipe, only remove packaging of the pipe, and do not remove the packaging of other devices. If foreign particles are accidentally mixed into a certain component during the installation process, clean it with a clean cloth or a vacuum cleaner in time. Moreover, in an installation suspension period, seal and protect the components that have been unpacked but not yet installed or put into use.

Before injecting the coolant into the cycle system, confirm again whether the entire cycle system is clean, including a circulating pump, pipes, Tank, radiators, and the like, and ensure that there are no obvious water stains, dust, metal chips, welding slag impurities, and the like.

Note:

a) A new circulating pump will be tested before leaving the factory, so there will be residual water inside. It is recommended to clean the residual water before leaving the factory or using it.

b) Regarding to processing technologies of the prefabricated pipeline and pipes, Tank and radiators, it is recommended to have a cleaning and drying process to ensure that there are no water stains, dust, metal chips, welding slag impurities, and the like. After cleaning and drying, seal as soon as possible to prevent internal contamination by dust and impurities.

c) The system cycle cleaning apparatus with the pressure booster function herein refers to an independent cleaning apparatus with a booster pump, which is only used when the cycle system needs cyclic cleaning, and does not need to be connected during a normal operation of the cycle system.

Before deploying the immersion cooling miners, after the cycle system is installed and filled with the coolant, the coolant should be circulated for 1 hour, then 100 ml samples are taken from the liquid return port of Tank, the liquid injection port of Tank, and other areas where impurities may be the most. Among them, the number of particles greater than or equal to 5 μm in the100 ml samples should be less than or equal to 500, the number of particles greater than or equal to 15 μm should be less than or equal to 100, and there are no particles larger than 50 μm (based on a cleanliness level NAS 3 of NAS 1638 standard). If the cleanliness level does not meet the standard, the cycle system is connected to a 5 μm high-precision filter apparatus with an independent booster pump for circulating and filtering the coolant until the cleanliness level meets the standard.

The operating procedures are shown in the table below.