3/5/2023 0 Comments Steam anylistThe need to condition the sample exists, because the sensors used for online analysis are not able to handle the water/steam sample at high temperatures or pressures. In this system stage, sample is first cooled in Sample Coolers, depressurized in Pressure Regulator and then fed to various analyzers while the flow characteristics is kept constant by means of Back Pressure Regulator. The system contains sample conditioning equipment and a grab sampling sink. This may be an open rack or a closed enclosure with a corridor in between. This is intended to house various components for sample conditioning. Sample conditioning system in some countries is also called sampling system, Wet Panel or Wet Rack. For High pressure and Temperature samples (Super heated steam, Reheated Steam, Saturated Steam, Separator drains, Feed water at Economizer inlets) SS316H must be used which withstand High Temperature of samples. This is to avoid corrosion of lines which leads to wrong measurement and analysis. Minimum Stainless steel SS316 Grade material must be used for sample Transport Lines. Also, sample lines must be continuously sloping to avoid accumulation of samples in lines. Hence joints and bends in the pipeline need to be minimal. It is very important that the sample meets least resistance. (b) Pressure drops in lines is an important aspect. SWAS room must be located close to low pressure water (condensate) samples from CEP discharge and condensate Polishing plants with lesser velocities. (Velocity) of sample from Isokinetic sample extraction probes to sampling system should be as minimum. Following care need to take while designing of this sample transportation lines:įollowing aspects are very important while designing of sample Transportation lines. Section#4 in ASME PTC 19.11-2008 standard describes details for designing of sample transportation lines. Sample extraction probes are extremely important and necessary of proper analysis of suspended impurities like Corrosion products, Total Iron, copper, carryover effects. These probes are designed as per ASTM D1066 standard for steam extraction and must be designed and tested for their structural integrity in High pressure, High Temperature and Higher velocity of samples. An important aspect of the sample extraction probe design is that the steam must enter the probe at the same velocity as the steam flowing in the pipeline from where the sample (it can be steam or water) was extracted. Its use depends on the process stream parameter to be measured, the required sample flow rate and the location of the sampling point (which is also called the 'tapping point'). The selection of the right type of probe is a challenge. For most applications, the sample probe is manufactured to the stringent codes applicable to high-pressure, high-temperature pipework. As the probe is going to be directly attached to the process pipe work, it may have to withstand severe conditions. The validity of the analysis is largely dependent on the sample being truly representative. To ensure that the sample that is going to be extracted for analysis represents the process conditions exactly, it is important to choose the correct sample extraction probe. India: Indian Boiler Regulation (IBR) form IIIC.Europe: Pressure Equipment Directive (PED).American: ASME Section VIII Div 1 and Div 2/ ASME U and S Stamp.Also many times country-specific certifications required like Sample handling system components are the most important pressure parts of sample handling system and need to have certification from ASME Section VIII Div1 & Div2 or PED. The International Association for the Properties of Water and Steam ( IAPWS) also gives good information on important measurement points and its significance. These aspects are well explained in international standards like ASME PTC 19.11-2008 and VGB S006 -00 2012_09_EN. To achieve this, it is important to take care of the following aspects of the sample: A well designed SWAS must ensure that the sample is representative until the point of analysis. These parameters include pH, conductivity, silica, sodium, dissolved oxygen, phosphate and chlorides. A well designed Steam and Water Analysis system (SWAS) can help in monitoring the critical parameters in the steam. The steam reaching the turbines need to be ultra-pure and hence needs to be monitored for its quality. Steam and water analysis system (SWAS) Ĭorrosion and erosion are major concerns in thermal power plants operating on steam. 1.6 Safety of analyzers against high temperature.1 Steam and water analysis system (SWAS).
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