D-4-1 Monitor Bodies



C.S.I. S.r.l.produces different monitor bodies with internal passages from 2 1/2” up to 8”, and discharge devices used in combination with monitors have a flow range from 500 l/min up to 30.000 l/min. Single water way monitors and smooth internal exempt from traces of casting etc. create lowered pressure losses.

Monitor bodies and discharge devices are controlled manually with lever or hand wheel systems or controlled remotely by using actuators using hydraulic or electric sources.

C.S.I. S.r.l. produces handmade welded monitor bodies from stainless steel materials. Discharge devices are produced from light anodized alloy, bronze or stainless steel materials and their combinations.

Monitor bodies generally consist of two joints which are used for the horizontal and vertical orientation of the flow. Joints are rolling mechanisms which ensure the fluid transfer internally from the base connection up to the discharge device connection, while keeping the fluid flowing in the structure, creating lower pressure losses thanks to a smooth internal passage without porosities. A standard joint assembly houses two races of phosphor balls kept in a grease bath. The integrity of joints is completed by O-Rings at inlet and outlet sides.

C.S.I. S.r.l. produces monitors according to customer’s requirements, like vertical or lowered models to reduce the lever effect of the transmitted reaction forces to the base onto which it is installed. Lowered models are ideal for over trailer applications, where reaction forces are critical to keep the trailer stable, and also lowered models are common for over hydrant installations to reduce traversal moments applied to the hydrant construction which may create cracks. Reaction forces are created on the discharge devices where the thrown liquid leaves the monitor system and are calculated according to Newton’s second formula by using pressure and flow rates. Maximum throw length is achieved at an inclination of 30-32°.

Discharge devices are classified according to the thrown liquid, self-foam and air aspirating feature and variability of the discharge pattern.

Discharge patterns affected by type of the fluid thrown and discharge pattern are provided by the discharge device. While Solid jets guarantee maximum throw lengths, spray patterns will provide more protection area with a gentle application over the protected surface.

Foam concentrates types used by the monitor system create significant differences according to their types. For example, while FP and FFFP-AR type foam concentrates, when thrown by foam branch pipes, create similar throw patterns like water, AFFF or synthetic foam concentrate types, creating an adverse effect on the travel distance since solution expands during flight. Foam monitors are designed to produce their optimum performance using only one manufacturers’ and predetermined foam concentrate type.