Manual over a tonne for larger trailer-mounted units. Portable

Manual fire monitors are widely
used in marine, offshore, industrial and many other corrosive environments to stop unwanted fires.
Fixed Monitors spend most of their lives stationary. However
when unwanted fires are perceived they can frequently be the only practical way
of applying foam or water to distinguish fire. Although simple in principle, fire monitors
are sophisticated engineering pieces of work designed to deliver a precise
performance after long periods of inactive. Just like another engineering
challenge the design of a fire monitor can take many arrangements depending on
the exact hazard it is anticipated to protect and the mechanism and technique
of operation the designer uses to complete the final layout. When designing a fire monitor
the designer must balance performance, operational life and ease of use bearing
in mind the cost. It is vital thus, that monitors are robust and will have a long
service life, even under harsh conditions.  Fixed fire monitors are often found anywhere
where there are considerable Class B fire risks whereas mobile or portable fire
monitors are frequently utilised to safeguard various risks by moving the
monitors around the site. Almost all industrial fire hazards are subject
to fire monitor protection, however some of the more popular applications may
include; refineries, chemical plants, helicopter landing pads, fuel distribution
depots and process plants etc… Although most fire monitors are permanently secured
to pipework and designed to distinguish particular installations, in certain
circumstances monitors are mounted on trailers that can be moved from one fire hazard
to another. But mobile monitors need a water supply, and usually this is delivered
by hoses or portable pumps. The jet reaction force for a portable fire monitor
can differ from few kg, for small ground monitor to over a tonne for larger
trailer-mounted units. Portable monitors must be secured so that it cannot move
once the full water flow and
pressure is applied. The design of pump pipes that make up a monitor is
critical as they serve several functions. They contain water or foam while permitting
the jet to be moved in both the vertical and horizontal planes, the pipes must have
good strength to resist pressure and reaction forces produced by the water and
they must be robust to accommodate the mounting of further items such as
levers, nozzles and hydraulic actuators etc.; all of this must be accomplished
with a design that is cost effective, has a tolerable pressure loss, will
resist corrosion and is not heavy. The design of a monitor is a negotiation
between cost, weight and performance.