Sampling location for water in drum boilers
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Does the location from which water samples are taken in a drum boiler affect the analysis results of the boiler water (pH value, phosphate, alkalinity)? Is there a difference between sampling from the continuous drainage and sampling from the periodic drainage?
Generally, proportional sampling of continuous discharge can be used
The drum water sampling here is taken from the drain branch. Drainage is arranged at the bottom of the drum; relatively speaking, more impurities are discharged through drainage than through continuous drainage. If a comparison must be made between continuous and batch processing, there are differences between the two, but they are not significant. Moreover, sampling using batch processing is more meaningful than that using continuous processing, as what matters in the end is having steam of qualified quality.
Why not take samples directly from the boiler water outlet pipeline?
The heat loss boiler you mentioned – the others mentioned steam boilers earlier.
We usually take samples for analysis from fixed positions, so the differences should not be significant
Does the location from which water samples are taken in a drum boiler affect the analysis results of the boiler water? It has a significant impact on phosphate levels. Is there a difference between sampling from the continuous drainage and from the regular drainage? Yes, there is a difference; the water from regular drainage comes from the bottom of the boiler, and it contains impurities that can affect the analysis results
It will have an impact. First, it is necessary to understand the definitions of continuous and intermittent discharge. In the case of continuous discharge, the sampling port is located at the surface of the steam generator’s drum liquid level, and what is discharged are solid suspensions, which need to be removed continuously ； The scheduled sampling port is located at the bottom of the steam generator’s drum, and it is used to remove sludge and residue; this process is generally carried out once a week. If the location of the sampling port is different, the pH value and phosphate levels will also be different