Monitors and Discharge Devices

Monitors are firefighting equipment generally used for the protection of flammable liquid storage tanks, loading racks, dykes marine and many other industrial applications where fire events may occur at certain distances and where closer intervention is not possible because of the nature of hazard. Monitor systems are a combination of two separate parts as monitor bodies and discharge devices, which determine the characteristics of the application. While monitor body passages vary from 2 1/2” up to 8”, discharge devices used in combination with monitors have a flow range from 500 l/min up to 30.000 l/min which guarantees the coverage almost all existing needs on the market. The flow rate of a monitor system is determined by the discharge device used in combination with it. Monitor body design meets several functions to contain the water while allowing to divert the flow to vertical and horizontal planes, at the same it should be robust enough to handle reaction forces generated by the thrown fluid, and also it needs to support discharge devices, remote controlling actuators installed on or lever/hand wheel mechanisms.
Pressure loss terminology comes from the pressure drop measured at a predetermined flow rate between entry point to the monitor system (i.e. flanges) and where it exits the system (outlet connection for discharge devices). C.S.I. S.r.l. shares information regarding pressure losses created by the monitor body versus flow rate passing through, and indicates the pressure-flow rate relations of the single discharge devices at a pressure rate applied to the discharge device. This enables the user to choose the correct combination of the monitor body size and the discharge device flow rate dependently of each other in order to satisfy fire protection needs.
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 loses thanks to its engineered dimensions. As standard joints house two ball races which are under grease bath. Joints are equipped with greasing nipples to assure the correct level of grease, since during production the grease is filled and does not need to be filled repeatedly if no adverse effect has been noted. The integrity of joints completed by O-Ring's at inlet and outlet sides.
C.S.I. S.r.l. produces monitors according to customer's requirements as vertical or lowered models to reduce the lever effect of the transmitted reaction forces to the base onto which it is installed. For example, 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 theoretically should be achieved with an inclination to the horizontal axis of 45° but in practice it is achieved at an inclination of 30-32° and another important factor is the fluid thrown and discharge pattern provided by the discharge device. While water branch pipes guarantee maximum throw lengths with a solid water jet stream, self- foam concentrate aspirating jet-fog nozzles with spray-fog stream create smaller droplets and expanded foam create a larger cross sectional area during travel with reduces distance travelled. Foam concentrate 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 create an adverse effect on the travel distance since solution expands during flight. Foam monitors are designed to produce their optimum performance using only one manufacturer's and predetermined foam concentrate type.

C.S.I. S.r.l. produces handmade monitors from stainless steel plus several models from bronze or aluminum materials.

How to contact us?

Via Roma, 94 - 27041 Casanova Lonati (PV) - Italy

(+39) 0385.287.070 - 078

(+39) 0385.287.088

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