Storage tanks
External cooling and exposure protection for defined tanks, based on fuel, tank geometry and credible fire scenarios.
Engineered cooling, fire control and exposure protection for industrial hazards
Medium & Low Velocity Water Spray Systems in Mumbai & Across India
Hazard assessment, hydraulic calculation, nozzle layout, deluge controls, installation, full-flow testing and preventive maintenance.
What is a medium or low velocity water spray system?
It is a fixed open-nozzle system that applies a calculated spray pattern over equipment, surfaces or an area for cooling, fire control or exposure protection according to the approved hazard-specific design.
The term “medium velocity water spray” (MVWS) is commonly used for engineered spray systems serving tanks, vessels and process exposures. “Low velocity” may be used informally, but the design must be based on tested nozzle performance, hydraulic calculations and the adopted standard—not terminology alone.
Reliance Fire Protection Systems supports survey, design, supply, installation, testing, commissioning and maintenance from Mumbai for technically suitable projects across India.
Potential MVWS and LVWS Applications
Pressure vessels and spheres
Water spray coverage for LPG or other pressurised storage where required by the adopted code and risk assessment.
Process vessels and columns
Cooling of exposed surfaces in refineries and process plants, coordinated with insulation and fireproofing.
Pumps and compressors
Selected hydrocarbon equipment or grouped hazards where fixed spray is part of the approved protection strategy.
Loading and unloading areas
Zoned spray arrangements for defined gantry or transfer hazards, with safe remote actuation and drainage.
Air coolers and elevated equipment
Equipment that is difficult to reach with manual streams may require fixed, hydraulically calculated spray coverage.
Main Water Spray System Components
Fire-water supply
Tank, pumps and ring main sized for the governing spray zone plus any required simultaneous firefighting demand.
Deluge valve and trim
Zone control with release, isolation, alarm, test, drain and supervisory components suited to the installation.
Open spray nozzles
Nozzles selected for discharge, pressure, angle, droplet characteristics and the surface or area requiring coverage.
Detection and release
Approved heat, flame or other detection with alarm, confirmation, shutdown and zone-release logic.
Distribution piping
Hydraulically sized pipes, strainers, supports and corrosion protection arranged for drainage and maintenance access.
Drainage and containment
Grading, drains, bunds and oil-water management sized for the spray discharge and credible spill or fire condition.
How an Automatic MVWS System Operates
Design references: IS 15325:2020 covers fixed automatic high and medium velocity water spray systems in India. NFPA 15 addresses fixed water-spray systems when adopted. Applicable OISD, CEA, insurer, client and authority requirements must also be checked.
Critical Engineering and Safety Checks
Design objective
Define whether the system is intended for cooling, exposure protection, fire control or extinguishment for the stated hazard.
Hydraulic performance
Calculate required density, area or surface, nozzle flows, friction losses and pressure at the remote nozzles.
Coverage and obstructions
Confirm nozzle angles, spacing, overlap, distance and shadow areas around supports, insulation and equipment.
Process coordination
Specify shutdown, isolation, depressurisation and emergency actions with the process owner and responsible engineers.
Wind and drainage
Outdoor wind affects distribution, while drainage and containment must manage the combined fire-water and spill scenario.
Acceptance and maintenance
Verify alarms, valve operation, pressure, flow and actual coverage, then manage nozzle blockage and system changes.
Pressurised-gas warning: Water spray may cool equipment and limit escalation, but extinguishing a gas jet flame before isolating the fuel can produce an unignited flammable cloud. Operations must follow the approved emergency plan. Water-reactive substances, incompatible electrical hazards and inadequate drainage require another protection strategy.
Medium and Low Velocity Water Spray Across India
Project enquiries are supported across all Indian states and union territories, subject to hazard suitability, hydraulic design, fire-water supply, drainage, site survey and approval requirements.
Andhra PradeshArunachal PradeshAssamBiharChhattisgarhGoaGujaratHaryanaHimachal PradeshJharkhandKarnatakaKeralaMadhya PradeshMaharashtraManipurMeghalayaMizoramNagalandOdishaPunjabRajasthanSikkimTamil NaduTelanganaTripuraUttar PradeshUttarakhandWest BengalAndaman and Nicobar IslandsChandigarhDadra and Nagar Haveli and Daman and DiuDelhiJammu and KashmirLadakhLakshadweepPuducherry
Key service locations: Mumbai, Navi Mumbai, Thane, Pune, Nagpur, Nashik, Ahmedabad, Surat, Vadodara, Jamnagar, Bengaluru, Hyderabad, Chennai, Visakhapatnam, Kochi, Mangaluru, Delhi NCR, Jaipur, Indore, Bhopal, Raipur, Kolkata, Paradip and project locations nationwide.
Medium and Low Velocity Water Spray FAQs
What is a medium or low velocity water spray system?
It is a fixed open-nozzle system applying calculated spray for cooling, fire control or exposure protection.
Where are MVWS and LVWS systems commonly used?
Potential applications include tanks, pressure vessels, process equipment, pumps, gantries and exposed structures.
How does an automatic MVWS system operate?
Detection initiates alarms and release logic, opens the deluge valve and supplies all open nozzles in the selected zone.
What is the difference between medium and high velocity water spray?
Nozzle characteristics, droplet momentum and objectives differ; hazard-specific criteria determine the appropriate system.
Can water spray extinguish a pressurised gas fire?
Water commonly cools exposed equipment; extinguishing the flame without isolating fuel can create an unignited vapour cloud.
How is an MVWS system tested and maintained?
Inspect supply, valves, detection, controls, nozzles and pipes, then verify actuation, pressure, flow and coverage safely.
Do you provide MVWS and LVWS systems across India?
Yes. We support enquiries from Mumbai across India, subject to engineering, site and approval requirements.
Related Water-Based Fire Protection
Request an MVWS or LVWS Proposal
Share equipment and tank drawings, stored product, process conditions, credible fire scenarios, water supply and pump data, detection philosophy, shutdown interfaces, drainage and applicable specifications.
Call +91 96999 90424 | sales@relifire.com | Contact Reliance Fire Protection Systems