Boiler house Blowdown vessels
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2021
AI-P693-36 EMM Issue 2
BCSR3 Blowdown Control System
Typical installation Warning: This document does not contain sufficient information to install the system safely. See the Installation and Maintenance Instructions supplied with the products for full details. The Spirax Sarco BCSR3 Blowdown Control System provides accurate, automatic control of boiler water total dissolved solids (TDS) and is suitable for shell and water tube boilers. Accurate control of TDS minimises blowdown and reduces the risk of carryover. Carryover of boiler water can cause waterhammer, corrosion and deposits within a steam system. The accumulation of deposits in control valves, steam traps and on heat transfer surfaces will adversely affect their performance resulting in decreased productivity and reduced efficiency. An automatic TDS control system can significantly reduce operating costs whilst maintaining good quality steam production. Operation The CP40 probe continuously monitors the conductivity of the boiler water, which is directly related to the level of TDS present. This measured value is compared with a ‘set point’ utilising the controller. If the measured value is lower than the ‘set point’, the BCV blowdown valve remains closed. If it is higher, the blowdown valve will open, purging the boiler of high TDS concentration water. The boiler water is replenished by clean make-up water, lowering the measured conductivity and closing the blowdown valve.
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The optional SCS20 sample cooler system provides a safe and effective method of taking regular boiler water samples for analysis. The cooling water jacket prevents flashing due to the pressure drop and sub-cools the boiler water sample to an acceptable analysis temperature. The BCR3250/BHD50 can operate a bottom blowdown valve by a real time clock controlled timer. Available options Blowdown valve Actuation Connections
BCR3250/BHD50 controller
BCR3150 controller
BCR3150
or
Probe elbow
CP40 Probe
230 Vac
BCV
24 Vac Pneumatic
see BCV TI
Controller
Voltage
Min. conductivity
BCR3250/BHD50 BCR3150
24 Vdc
≥ 1 μS @ 25 °C
Stop valve
Conductivity probe
Probe length
300 mm 500 mm 1000 mm 1500 mm
CP40
Check valve
Probe elbow
Size/connection (boiler)
BCV blowdown valve
PE1 PE2 PE3 PE4 PE5
DN15/PN40 DN20/PN40 DN25/PN40
SCS20 sample cooler system
DN20/BS10 Table H
DN25/BS10 Table H Available options continued on next page
Note: See specific product TI's for further information.
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