High Back Pressure Foam Generator

The materials used in construction
fully comply with the international
standards accepted by the oil and
petrochemical industries.

Using a suitable fuel resistant foam
concentrate such as Angus Alcoseal,
Petroseal and FP70, aspirated foam
with an expansion ratio of between
2:1 and 4:1 can be produced against a
back pressure of up to 40% of the inlet
pressure. This property enables the
foam to overcome the pressure exerted
by the head of fuel and downstream
pipework friction losses.

A non-return valve is fitted as standard
to ensure that fuel does not escape
from the air inlet hole during any stage  
of operation and also to ensure that full
pressure is available immediately after
the system is activated.
Two pressure gauges are fitted to the
225, 450 and 900 models to measure
foam solution input pressure and
system back pressure which facilitates
operation in “semi-fixed” installations.
Pressure gauges are optional on the
1400, 1900, 2250, 2650, 2900 and 3300
models.

In addition to any valving on the
foam line, a bursting disc assembly is
normally installed between the HBPG
and the tank to ensure safety integrity.
The disc is designed to withstand
pressure from the tank side, but to
rupture when finished foam from
the HBPG reaches a pre-determined
pressure. A full range of compatible
bursting discs and  holders are
available.