EWT Water Technology – Water Treatment

EWT Water Technology

Steam and Water Analysis System (SWAS)

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A steam and water analysis system (short: SWAS) is an arrangement of equipment for sampling and analysis of hot water samples or steam samples, in order to monitor the water chemistry of steam boiler plants or hot water boiler plants. For example, in steam boiler plants operating in →"low TDS" operating mode, typical sampling points include condensate, boiler feed water, boiler water, saturated steam, and main steam.

Typically, this equipment includes →sample coolers, sampling cation exchangers, pipelines, valves, and instrumentation, all arranged onto a sampling rack. A sampling system will usually allow both continuous sampling for automated on-line analysis of key parameters, and grab sampling for manual analysis of secondary parameters.

Continuous cooling water flow is required for cooling the samples down to analysis temperature.

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Design Example:

steam and water analysis system (SWAS)

Steam and water analysis system (SWAS) for sampling and analysis of boiler feed water, boiler water, and steam. Including sample coolers, cation exchanger columns, pipelines, valves, and instrumentation; completely pre-assembled on sampling rack.

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Technical Data:

sample mass flow usually 20 ... 60 kg/h for each sampling point
sample inlet pressure available up to 160 bar, see →sample cooler technical data
sample inlet temperature available up to 550 °C, see →sample cooler technical data
sample outlet pressure atmospheric
sample outlet temperature usually 25 ... 45 °C
cooling water mass flow approx. 10× ... 50× the sample mass flow
recommended cooling water outlet temperature ≤ 30 ... 50 °C, depending upon cooling water quality and required heat transfer
allowable cooling water quality depending on sample inlet temperature, cooling water outlet temperature, and sample cooler material
material options sample cooler • stainless steel (e.g. 1.4541, 1.4571)
sampling pipelines • stainless steel (e.g. 1.4404, 1.4571)
cooling water pipelines • carbon steel (e.g. P235TR2)
• stainless steel (e.g. 1.4541)
sampling valves • stainless steel (e.g. 1.4408, 1.4571)
cooling water valves • brass (e.g. CW617N)
• grey cast iron (e.g. EN-JL 1040)
• stainless steel (e.g. 1.4401, 1.4408)
gaskets • ethylene propylene diene monomer rubber (EPDM)
• polytetrafluoroethylene (PTFE)
• NBR composite
• graphite composite
sampling rack • polyethylene (PE)
• stainless steel (e.g. 1.4301)
control options sample analysis • pH value
• direct electrical conductivity
• cation conductivity
• sodium
• silicic acid
• total organic carbon (TOC)
• dissolved oxygen
internal process monitoring • sample volume flow
• sample outlet temperature

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further downloads

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2018-05-13 • water treatment made in GermanyCompany InformationPrivacy