Could everyone help analyze the function and location of our sampling points?

I also have an idea: since the outlet and inlet pipelines of our pressure vessels are relatively close to each other and both pass by the analysis room, I plan to connect all the sampling points to the analysis room via pipes, so that sampling and analysis can be carried out on-site. What are the advantages and disadvantages of this approach?

S-101: Before the desalination pump; S-102: Brine bypass tank; S-103: Before the pressure pump; S-104: Outlet of the pressure vessel; S-105: Outlet of the Venturi mixer; S-106: Collection tank at the outlet of the preprocessor; S-107: Saltwater storage tank; S-108: Outlet of the filtrate pump; S-109: Before the filtered salt water pump; S-110: Before the acid cleaning solution pump. I think items 4 and 5 are indeed a bit repetitive; it would be sufficient to keep just one of them. There are no sampling points set up at locations 4 and 5 in our factory. I think sampling at 1, 3, 8, 9, and 10 before the pump is fine; we all take samples before the pump, and it seems okay! As for the 7% saline high-level tank, it is recommended to connect a pipeline to a location on the first floor for sampling.

Before the S-101 desalination pump —— Considering that you use a diaphragm/ion exchange water distribution system, whether to take samples before the pump or in the water distribution tank depends on your distribution method. If a continuous water distribution process is used, sampling can be done either before or after the pump; however, if intermittent distribution is employed (with individual water distribution tanks used to adjust the sodium hydroxide level), sampling should not be done before the pump, but rather in the water distribution tanks. In fact, taking samples at this location only allows for a rough assessment of the parameters of the evaporated alkaline brine; it has no other significance. If there is not enough alkaline brine, some of the ion-exchange membrane-produced fresh water must be returned here, or other types of water must be added, which increases the uncertainty in the composition of the water mixture. S-102 Brine Baffle Tank —— There are no objections to taking samples for analysis at this location; the focus is on monitoring whether the brine is saturated. In terms of the manufacturing process, the amount of sodium hydroxide added is adjusted based on the pH value. Since the previous reaction is not completely complete, it isn’t very useful to take samples to monitor the excessive amount of sodium hydroxide present. S-103, before the pressure pump —— What the pressure pump draws is the brine from the front reaction tank; its sodium chloride content is the same as that in S-102. The only useful aspect of it is to provide a rough estimate of the efficiency of the front reaction, namely the magnesium content in the liquid phase and the amount of excess sodium hydroxide. Sampling in front of the pressure pump is not very reasonable; since the reaction takes place in a sump and the pressure pump is installed at a higher position, it is crucial that there are no leaks in the vacuum ahead of the pump. Installing a sampling port in front of the pump can easily cause air to enter that vacuum, resulting in abnormal operation of the pump. S-104 Pressurized vessel outlet ———— Personally, I don’t see any point in it; the parameters are repeated from S-103. Can it also determine the amount of dissolved air? S-105, outlet of the venturi mixer – sampling is taken at this location to analyze the amount of ferric trichloride added, which is used to verify the proper operation of the instruments. The significance of this is not very great, so it’s not necessary to take samples for analysis every shift; however, the sampling point needs to be maintained so that samples can be taken for analysis in case of abnormal conditions. S-106 Preprocessor outlet sump —— this is necessary; it is a key point for verifying the operating condition of the floating clarification tank. S-107 Saltwater surge tank —— This surge tank is used to supply liquid to the filter after the subsequent reaction is complete. Taking samples here is not as convenient as taking samples at the outlet of the subsequent reaction tank or at the inlet and outlet of the intermediate salt water pump; the samples obtained in both cases are identical. S-108 Filter effluent pump outlet —— this is a key point for verifying the overall operating condition of the filter. Before the S-109 filtered salt water pump —— The filtered salt water pump is used to supply water to the electrolysis zone; sampling is carried out here, and this is a key point for defining responsibilities. Before the S-110 pickling solution pump —— the importance of this goes without saying. Regarding the issue of sampling before and after the pump mentioned by the moderator, it’s a matter of personal opinion – each approach has its own advantages. However, apart from the high installation position of the pressure pump, there is no issue of low pressure in front of the pump that prevents sampling.

This post was last edited by flay0303 on 2010-6-8 12:32. The design institute seems determined to drive the analysts to exhaustion. . . If conducting analyses on saltwater concentration, it’s sufficient to take samples from the water distribution tank, the brine bypass tank, the filter outlet, and the outlet of the refined salt water pump once or twice a day. The brine bypass tank is a critical location, so sampling there should be done more frequently. Other parameters to analyze include FeCl3, excess alkali, SS, and calcium and magnesium levels. Samples are generally taken before the pumps, as the pressure there is lower; in practice, such strictness isn’t always required. For SS sampling, it’s important to choose a clean location – preferably using a plastic valve, as otherwise it might affect the results. However, as far as I know, some organizations don’t conduct SS tests, as the data obtained from such tests aren’t accurate at all; the final values are merely estimates. Calcium and magnesium levels are used as a basis for determining SS levels, so I don’t think there should be too many problems

Reply to 4# huawei: Regarding the explanation given by Xiao Laohu regarding the electric tiger, “The outlet of the S-104 pressure vessel – personally, I don’t see any meaning in it; the parameters are the same as those of S-103. Can it be used to determine the amount of air dissolved?” ”I’m a bit disagreeable – this sampling port is also necessary. Considering the presence of air and the effectiveness of air flotation, this sampling point isn’t meant for analysis; it’s used for air flotation experiments