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Medium Velocity Water Spray Nozzles has an external deflector, which discharges water in a directional cone shaped pattern of small droplet size. The water is uniformly distributed over the surface to be protected. The nozzle is used in deluge water spray system for special hazard fire protection application. As the design and intent of specific water spray system may vary considerably, a MV nozzle is made available in several combination of orifice sizes and spray angles. The minimum desirable pressure to achieve a reasonable spray pattern is 1.4 Kg./Sq.cm. The water distribution pattern as shown in the graph in following pages is at an average pressure of 2.0 Kg/Sq.cm. The change in pressure between 1.4 to 3.5 Kg./sq.cm. does not affect considerable change in spray angle. The spray pattern shown is with indoor application. System designer must consider wind velocity while designing the system for outdoor application. Field obstruction if any affecting the spray pattern of the nozzle must also be considered. The nozzle may be oriented to any position which is deemed necessary to cover the hazard.Some of the areas where this system is widely used are: | |||
| Horizontal storage vessels (like LPG Bullets, NH3 storage tanks etc.) | |
| Vertical storage vessels (like benzene, xylene, toluene tank age etc.) | |
| Spherical storage vessels (like LPG bullets, spheres etc.) | |
| Spot protection (Protection of selective areas/ equipments) |
Maintenance
Use Teflon tape or soft thread sealant on male thread of the nozzle. The nozzles must be hand tightened into the fitting. LIFECO make wrench must be used to tighten the nozzle unit into the fitting. Excessive tightening torque may result into serious damage to nozzle arms and the deflector which may affect spray pattern of the nozzle and it's performance.
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Choolai, Chennai, Tamil Nadu 
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