What should be noted when introducing circulating water into the system (aqueous solution)

Precautions for starting the circulating water system: 1. First, open the exhaust valve at the highest point of the circulating water system, as well as the inlet and outlet valves of each cooler. Open the exhaust valves and drain valves of each ammonia condenser, and also open the main drain valve at the outlet of the system. Then slowly open the water inlet valve, but do not open it fully. 2. Adjust the water pressure. 3. Adjust the liquid level of the ammonia condenser. Prevent negative draws.

1. Pre-startup preparations (material preparation, equipment inspection) 2. System water flushing 3. System chemical cleaning 4. System chemical pre-coating

When introducing circulating water into the system, it is important to discharge the inert gas promptly, and secondly to do so slowly to prevent equipment damage due to high pressure differences. Operation steps: 1. Open the drain valve on the main circulating water pipe and the drain valves of each cooling device. 2. Slowly open the main valve for supplying circulating water and the inlet valves of each cooling device; close them after the drain valves on the main circulating water pipe and those on each cooling device have started to discharge water. 3. Sequentially open the outlet valves of each cooling device and the main return valve for the circulating water. 4. The pressure difference between the inlet and outlet of the circulating water is controlled through the main inlet valve and the main outlet valve for circulating water.

Points to note when starting the circulating water system: a. Prevent air oscillations from damaging the condenser. b. Ensure proper functioning of the return water siphon. When starting the circulating water system, improper operations can lead to air oscillations in the condenser’s circulating water chamber due to rapid and excessive water inflow. Such air oscillations can cause deformation and damage to the water chamber and copper tubes of the condenser. An effective way to avoid this is by controlling the rate of water inflow. Before starting the circulating water system, it is necessary to conduct a thorough inspection of the system: the air valves at the top of the condenser’s circulating water chamber should be fully open, the air valves on the circulating water return pipes should also be fully open, the drain valves on the circulating water inlet pipes should be closed, and the drain valves in the water chamber should also be closed. The inlet valve for circulating water should be opened only to about 10% of its full opening degree; it should not be opened further, while the return valve should remain closed. In this way, once the circulating water pump starts, the limited flow of water entering the water chamber through the inlet valve, combined with the continuous expulsion of air through the open air valves, helps to prevent air oscillations. Once water begins to flow out of the top air valves, they should be closed, and similarly, the air valves on the return pipes should be closed once water starts to flow from them. At this point, the inlet and return valves can be gradually opened to adjust the circulating water pressure until the inlet valve is fully open. This approach not only prevents air oscillations caused by too rapid water inflow but also ensures proper establishment of the siphon effect for the return water. The steps outlined above are applicable not only when starting the circulating water system but also when cleaning one side of the condenser or when removing safety measures.

Precautions for circulating water: 1. First, open the inlet and outlet valves for the circulating water as well as the exhaust valve of each cooler. 2. Open the main inlet valve for circulating water on the first floor by about a quarter to introduce the circulating water into the system. 3. Next, starting from the first floor of the main plant, wait until water continuously flows out from the exhaust valves of each cooler (water must flow out continuously! ) after that, close the exhaust valve. Then, move upward layer by layer until the exhaust valve at the topmost point is closed. 4. Open the main return valve on the first floor by about a quarter. 5. Gradually open the main inlet valve on the first floor completely. 6. All inlet valves for the circulating water in each cooler should be fully open, and the return water valves should be set to their normal opening degree. 7. Adjust the pressure difference by the opening degree of the return main valve on the first floor.

1. First, open the exhaust valve at the highest point of the circulating water system. 2. Use the drain at the lowest point. 3. Control the inlet valve to regulate water pressure. This post was last edited by lxq700918 on 2009-2-14 at 13:43.]

Before introducing circulating water, it is advisable to let it circulate through the return line for a while after the circulating water pump is started, before introducing it into the system, in order to prevent impurities from clogging the heat exchanger