Boiler house
Feedtank ancillaries
ISO 9001
2.1.1
Total steam
generation
rate (kg/h)
Mixing
unit
Tank depth
1250
1500
2000
2500
Mixing unit/immersion tube selection
5 000
DN150
MU150
IT-950
MU150
IT-1200
MU150
IT-1600
MU150
IT-2100
10 000
DN200
MU200
IT-950
MU200
IT-1200
MU200
IT-1600
MU200
IT-2100
20 000
DN250
MU250
IT-950
MU250
IT-1200
MU250
IT-1600
MU250
IT-2100
30 000
DN300
MU300
IT-950
MU300
IT-1200
MU300
IT-1600
MU300
IT-2100
50 000
DN400
MU400
IT-950
MU400
IT-1200
MU400
IT-1600
MU400
IT-2100
TI-P401-25
AB Issue 3
Cert. No. LRQ 0963008
DH Type
Flash Condensing Deaerator Heads
A simple low cost solution for deaerating boiler feedwater at atmospheric pressure
•
Mixes hot and cold incoming flows
•
Liberates oxygen and other gases
•
Stainless steel for long maintenance free life
•
Easy to install
Description
Spirax Sarco flash condensing deaerator head is designed to mix
incoming flows of cold make-up, condensate return and flash
steam to the boiler feedtank. This mixing action is achieved by
directing the downward flow through a baffle arrangement within
the unit. This liberates dissolved gases from the cold make-up,
which are vented to atmosphere. The cold make-up inlet is fitted
with a spray screen which diffuses the flow, increasing its surface
area to promote thorough mixing with the condensate and
flash steam.
A Spirax Sarco flash condensing deaerator head consists of three
parts:
1
3
2
3
- A mixing unit, which is bolted to the top of the tank and is
supplied with connections to customer specification for cold
make-up, condensate return, flash steam from blowdown etc.
- An immersion tube, which distributes the mixed fluids into the
tank and has an integral plate flange which is sandwiched
between the tank and mixing unit flanges.
Immersion tubes are fully described in separate literature.
- Gaskets. Two gaskets are required, one fitted each side on
the immersion tube flange. They are ordered separately.
Available types
The mixing unit is available in five nominal diameters (DN150,
DN200, DN250, DN300 and DN400) flanged to BS 4504 PN16 or
BS 1560 Class 150.
Immersion tubes are available in diameters to suit the deaerator
heads and lengths of 950, 1200, 1600 and 2100 mm to suit TM
metric feedtanks. Since each deaerator head is built to suit specific
plant requirements we recommend that your local Spirax Sarco
Engineer is contacted for a connection layout sheet and to discuss
your requirements.
Selection table
Head comprises
Item
Quantity
1
1
2
1
3
2
Application
Description
Mixing unit
Immersion tube
Gasket
Material
Austenitic
stainless steel
Austenitic
stainless steel
Silicone rubber
Limiting conditions
PN2.5 rating. Suitable for saturated steam 1 bar g, 120°C.
The mixing unit only is hydraulically tested to 2 bar g.
Spirax Sarco flash condensing deaerator heads are ideal for boiler
feedtank applications. They are suitable for both new and retrofit
applications. Each head is fitted with a connection for air vent and
recirculating feedwater spray nozzle. The air vent is for the
immediate venting of liberated gases (the connection should also
include a vacuum breaker). For further details on the RFS
recirculating feedwater spray systems see separate literature.
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.
© Copyright 2004
