EWT Water Technology – Water Treatment

EWT Water Technology

Sample Cooler

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A sample cooler serves for safe sampling, cooling and if applicable condensation of hot fluids. The following descriptions are limited to water to water heat exchangers used in steam boiler plants and hot water boiler plants for the above purposes.

A sample cooler consists of a pressure vessel containing a pipe coil. The sample medium, for example boiler feed water, flows through the inside of the pipe coil, while the cooling medium, usually water, flows around the outside of the pipe coil. This results in heat being transferred from the sample medium to the cooling medium.

Installed into a complete →steam and water analysis system, sample coolers are used for both continuous sampling with fully automated on-line analysis, and for manual grab sampling with manual analysis. Available accessories include isolating valves, throttling valves, pressure relief valves, solenoid valves for high temperature shut-off, local and remote temperature indicators, local and remote flow indicators, cation exchangers, and any instrumentation for on-line water analysis.

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Design Example:

sample cooler

Sample coolers for manual grab sampling, different types. From left to right: Type 080-250 C and 0850-500 C, both compact design with integrated discharge funnel. Type 125-300 H, 125-400 H, and 125-600 H, each high-performance design with removable pipe coil.

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Technical Data:

type 080-250 C 080-500 C 125-300 H 125-400 H 125-600 H
design compact cooler high performance cooler
heat transfer surface area 0.07 m² 0.14 m² 0.21 m² 0.29 m² 0.43 m²
heat transfer rate, approx. ≤ 3 kW ≤ 10 kW ≤ 35 kW ≤ 60 kW ≤ 90 kW
sample mass flow liquid ≤ 30 kg/h ≤ 45 kg/h ≤ 75 kg/h ≤ 120 kg/h ≤ 150 kg/h
steam ≤ 30 kg/h ≤ 60 kg/h ≤ 90 kg/h
allowable pressure, max. pipe coil 40 bar 160 bar (on request: 300 bar)
shell 10 bar
allowable temperature, max. pipe coil 200 °C 250 °C 550 °C
shell 110 °C
volume pipe coil 0.1 L 0.2 L 0.3 L 0.4 L 0.5 L
shell 1.5 L 3 L 5 L 6 L 9 L
Pressure Equipment Directive (PED) Directive 2014/68/EU, article 4, section 3. Sound engineering practice. The pressure equipment must not bear the CE-marking.
connections inlet sample medium tube fitting do=8 mm butt weld end do=14 mm
outlet sample medium pipe do=8 mm
inlet cooling medium threaded, female Rp 1/2" threaded, female Rp 3/4"
outlet cooling medium threaded, female Rp 3/4"
drain threaded, female Rp 1/4"
material pipe coil stainless steel 1.4571 stainless steel 1.4404 (on request: 1.4539)
shell stainless steel 1.4541
flange, cover stainless steel 1.4571
gasket NBR composite
stop valve sample medium stainless steel 1.4571
throttling valve sample medium stainless steel 1.4571
stop valve cooling medium stainless steel 1.4408
empty mass, approx. 4 kg 7 kg 14 kg 17 kg 22 kg
allowable cooling water quality turbidity < 5 NTU
total suspended solids (TSS) < 5 mg/L
pH (¹) 4.5 ≤ pH < 10
water hardness (¹) < 2.5 mmol/L ≈ 250 ppm as CaCO3
chloride (¹) < 10 ... 200 mg/L
iron < 0.2 mg/L
manganese < 0.05 mg/L
free chlorine < 0.5 mg/L
¹ Depending on detailed process data and water analysis parameters; see PDFdata sheet. For high heat flux applications, we recommend using →demineralized water for cooling.

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further downloads

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2022-02-28 • water treatment made in GermanyCompany InformationPrivacy