Boiler house Feedtank ancillaries
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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 2025
TI-P401-07 EMM Issue 8
IT Immersion Tubes
Description Spirax Sarco immersion tubes may be: - Connected directly to the pipeline, to distribute condensate into feedtanks. - Used with a mixing unit to form a flash condensing de-aerator head (not applicable to the IT100 unit). Note: A flash condensing de-aerator head can be used to mix flash steam (from a TDS control system), cold make-up water, and condensate, and sparge it into a feedtank. It is described in separate literature. Immersion tubes offer a much neater solution than traditional sparge pipes, and can reduce many of the problems associated with them, for example vibration, rusting, and waterhammer. Immersion tubes are suitable for both new and retrofit applications where the feedtank is adequately constructed and braced.
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Available types Available as types IT100_, IT150_, IT200_, IT250_, IT300_, and IT400_ with an integral inside bolt circle sandwich flange to suit ANSI 150 or EN 1092 PN16. They are available in lengths to suit TM metric feedtanks. Other lengths can be made to special order. Immersion tubes are designated by IT followed by DN followed by length of immersion tube in mm. e.g. IT250-1600 is DN250 and is 1 600 mm long from the underside of the flange. It is suitable for a 2 000 mm deep tank.
Capacity - when used without a Mixing Unit (MU) * Gravity condensate (with 5% Flash) Pumped condensate
* For other quantities of flash steam the capacity may be determined pro rata i.e. for 10% flash capacity is half that shown.
IT type
DN
kg/h
kg/h
IT100_
100
1 015
2 500
IT150_
150
2 285
5 000
IT200_
200
4 065
10 000
IT250_
250
6 350
20 000
IT300_
300
9 145
30 000
IT400_
400
16 255
50 000
As a general rule the size of an immersion tube should be at least one DN larger than the condensate return main. Important note: The above table is only valid for condensate, where the flash steam content has to be considered. When sizing an immersion tube for use with a de-aerator head, use the guidelines in the flash condensing de-aerator head TI. The DH/IT has a higher overall capacity as it is able to condense the flash steam content of the fluid before it enters the tank. We do not make a mixing unit to suit the IT100.
Limiting conditions PN2.5 rating. Suitable for condensate at up to 1 bar g, 120 °C.
TI-P401-07 EMM Issue 8
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IT Immersion Tubes
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