rigours of often harsh or corrosive working
environments is, obviously, a major concern. Again
using SKUM proportioners as a top-end example,
they are manufactured from high-grade corrosion-
resistant bronze and stainless steel for reliable
maintenance-free operation.
Bladder tank proportioners
Bladder tank proportioners from SKUM come in a
similar number of design and performance options
and are the ideal solution, particularly when
upgrading an existing water sprinkler system to a
foam/water system. SKUM pressure tanks are
carbon steel and contain a butyl rubber bladder
that contains the foam concentration. They are
currently available either as a horizontal tank
with capacities spanning from 400 litres (106 US
gallons) to 25,000 litres (6,600 US gallons), or as a
vertical tank with a lower maximum capacity of
12,000 litres (3,250 US gallons). However, plans
are in hand to introduce larger tanks in the
coming months.
Currently, bladder tank proportioners, which are
also available in standard and wide-flow designs,
offer similar capacities to the balanced pressure
proportioners for foam pump systems, but with a
slightly lower top limit of 34,100 litres a minute
(9,009 US gallons a minute). Water inlet sizes for
the standard models again span from 50mm (two
inches) diameter to 250mm (ten inches), while the
wide-flow range proportioners for bladder tanks
are available in 100mm (four inches), 150mm (six
inches) and 200mm (eight inches) diameter.
The proportioner is designed to fit between
flanges. A distance equal to at least five times the
water connection pipe's diameter is required
before entering the proportioner, and the mini-
mum distance for water pressure into the tank
upstream of the proportioner is four times the
pipe's diameter, with a maximum of ten metres
(33 feet).
Around-the-pump and in-line inductors
Although commonly referred to as inductors, both
around-the-pump and in-line inductors are propor-
tioning units.
As well as being regularly used in marine appli-
cations, around-the-pump inductors are also
utilised on specialised foam trucks and fixed
systems where a dedicated water pump is
available. It is a foam concentrate proportioning
unit that is designed for connection in a by-pass
between the pressure and suction sides of the fire
water pump that diverts a small proportion of
the feed water flow, with a negligible effect on
the fire water line pressure.
The stationary in-line inductor injects foam into a
water stream. It can accommodate high back
pressures, which increases the allowable distance
between the foam injection point and the foam
delivery device. Each inline inductor is factory
calibrated for a given fixed flow/pressure setting,
with foam induction of up to six percent. A number
of variants are available in the SKUM range with
connection sizes for 25mm (one inch) to 150mm
(six inches) and water capacities spanning from
100 litres a minute (26 US gallons a minute) at 5
bar (74 psi) inlet capacity to 12,500 litres a minute
(3302 US gallons a minute) at 16 bar (232 psi). IFF
INTERNATIONAL FIRE FIGHTER 33
A SENSE OF PROPORTION
INDUSTRIAL
Headquarters
Liebigstr. 5 � D-22113 Hamburg
Telephone +49 (0) 40-73 61 68-0
Telefax +49 (0) 40-73 61 68-60
E-Mail: info@sthamer.com � www.sthamer.com
Branch Office
K�nigsteiner Str. 5 � D-01796 Pirna
Telephone +49 (0) 35 01-46 44 84 + 52 40 06
Telefax +49 (0) 35 01-46 44 85
FOAM
FIGHTS
FIRE
We present a comprehensive range of high-performance and environment compatible fire fighting foam concentrates.
24 HOUR EMERGENCY SERVICE +49 (0) 40-736 16 80
PRESS RELEASE
MOUSSOL FF 3x6
FLOURINE FREE AR/AFFF
CALL US NOW TO DISCUSS
YOUR FOAM REQUIREMENTS
Email sales5@sthamer.com
Peter Kristenson is Senior
Manager Product
Management Team for SKUM
foam hardware at Tyco Fire
Suppression & Building
Products. More information is
available by telephone on
+44 (0) 161 875 0402, by fax
on +44 (0) 161 875 0493, or
via email at marketing@
tyco-bspd.com. The SKUM
website can be found at
www.skum.com

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