Boiler house
Steam injectors
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 2015
TI-P401-06
AB Issue 5
Description
Spirax Sarco steam distributors distribute low pressure flash steam
into atmospheric water tanks. They ensure rapid condensation of the
steam and efficient heating of the water. The hole configuration
provides a self-regulating control feature ensuring that holes
progressively come into use as the steam flowrate increases. An
internal stainless steel mesh ensures quiet operation.
Principal features:
-
Simple installation - no special supports required.
-
Compact, lightweight and strong.
-
Stainless steel for long life.
-
Eliminates waterhammer.
-
Quiet operation.
Application - Boiler blowdown heat recovery
Steam distributors are ideal for supplementing the heating of boiler
feedwater tanks using flash steam. When used in conjunction with
a flash vessel, as part of a boiler blowdown heat recovery system,
flash steam recovery is simple, of low capital cost and is maintenance
free. Additionally, the flash steam is condensed to pure water reducing
the amount of make-up water and chemical treatment required.
Generally for sizing purposes use a differential pressure of 0.4 bar.
Steam distributors are not recommended for condensate recovery
or live steam injection duties, as they may be damaged by
waterhammer.
Available types
SD40S, SD50S and SD80S screwed BSP (BS 21 parallel) or NPT.
SD80, SD100 and SD150 flanged to suit EN 1092 PN16 or
ASME Class 150.
Screwed SD
type steam
distributor
shown.
Note:
flanged
connections
are
available.
Limiting conditions
Not suitable for live steam applications.
Maximum saturated steam conditions 1 bar g @ 130°C
Recommended maximum flash vessel operating pressure is 0.4 bar.
Capacities
Each distributor has a number of holes. The flow of steam through
the holes depends on the differential pressure available. The table
below shows capacities in kg/h of distributed steam when heating
tanks which are vented to atmospheric pressure.
2.2.8
SD
Steam Distributor
Materials
Austenitic stainless steel 304.
Dimensions (approximate) in millimetres
Steam distributor
SD40S
SD50S
SD80S
SD80
SD100
SD150
Connection
Screwed
11⁄2" BSP or NPT Female
Screwed
2" BSP or NPT Female
Screwed
3" BSP or NPT Female
Flanged
DN80 PN16 or Class 150
Flanged
DN100 PN16 or Class 150
Flanged
DN150 PN16 or Class 150
D
100
150
215
215
235
305
L
70
85
110
180
210
220
Steam supply
pressure bar g SD40S
0.2
99
0.4
135
0.6
171
0.8
198
Steam distributor
SD50S SD80S & 80 SD100
176
396
643
240
540
877
304
684
1111
352
792
1287
SD150
935
1275
1615
1870
Intermediate values may be obtained by linear interpolation.
For higher capacities use 2 or more distributors in parallel.
Safety and installation information
L
Steam distributors operate at temperatures which could cause
severe scalding, and produce strong currents of very hot
steam / water. Do not touch or lean over open tanks which are being
heated, even if the water still appears to be cold. Ensure closed
tanks are adequately vented and that the vent is unobstructed.
Steam supply pipework must be firmly anchored to prevent vibration
and stress in the tank wall. Tanks must be adequately constructed
and braced/stayed as necessary to avoid vibration. Consult your
local Spirax Sarco engineer if in any doubt.
Installation note:
Fit the end of a vertical downpipe in the tank so that the bottom of
the distributor is at about
1
/
3
off the working depth of tank. The piping
between the steam source and distributor should be the same
nominal size as the connection on the distributor. It is recommended
that the piping is less than 10 m in length in order to minimise the
pressure drop.
Disposal:
This product is recyclable. No ecological hazard is anticipated
with the disposal of this product, providing due care is taken.
How to order
Example: 1 off Spirax Sarco 11⁄2" SD40S steam distributor having
a screwed BSP connection.
D
