Boiler house Steam injectors
2
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 2018
TI-P401-04 EMM Issue 4
INS6 and INS10 Direct Steam Injection Heating Systems
A complete system for boiler feedtank, hot water storage and other industrial process heating requirements.
2.2 7
Principal features: • Stainless steel injector for long life • Simple installation
• Self-acting system requiring no external power supply • Efficient and economic heating • Single seated valve giving tight shut-off
General description Spirax Sarco INS direct steam injection heating systems are designed to inject steam into tanks of water or process liquor to ensure quiet and efficient heating of the tank contents. The injector draws in cold liquid, mixes it with steam within the injector nozzle and distributes the hot liquid throughout the tank. In many applications the circulation induced by the injector is an advantage ensuring thorough mixing and avoiding temperature stratification. Available system types INS6 and INS10, screwed BSP (BS 21 parallel) or NPT. The injectors are for horizontal installation. The selection of a system depends on the flowrate of steam required to heat the tank contents and the steam supply pressure to the correct valve. Boiler feedtank applications Oxygen must be removed from boiler water if corrosion is to be prevented. Oxygen can be removed in two ways, either by the use of oxygen scavenging chemicals or by thermal deaeration. The dissolved oxygen content of water: - At 20 °C is 9 ppm
By heating the boiler feedwater typically to 85 - 90 °C to remove most of the oxygen, and using oxygen scavenging chemicals, the use of chemicals can be reduced by up to 75%. Additionally, boiler efficiency may be increased since blowdown requirements may be lowered. The fitting of a dial thermometer on the tank is recommended and is available from Spirax Sarco.
- At 60 °C is 5 ppm - At 90 °C is just under 2 ppm.
Stop valve
5
Y-type strainer
1
System components No. Part
Dial thermometer
Material
1 2 3 4 5
Control valve
Bronze/gunmetal
3
Controller and sensor
Brass
2
Sensor pocket
Stainless steel
4
Injector
Stainless steel
Vacuum breaker
Brass
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