Tank Farm / Bund Area

Foam-water monitor (PL Series) · 40–64 L/s · Worm-gear · NFPA 11

Process Unit / Equipment Cooling

Water monitor (PS Turbine-Worm) · 40–80 L/s · NFPA 15

Loading Rack / Roadside

Anti-collision base (PZ-1.6C) · Foam-water monitor · NFPA 15 §8

Unmanned / Remote Area

RCFM electric remote control · Auto detection link · NFPA 15

Standard for Water Spray Fixed Systems for Fire Protection

The primary standard for fixed water monitor systems protecting outdoor equipment. Key requirements include:

• ▶Application rate: 10.2 L/min·m² for exposed ordinary hazard equipment (vessels, structures, piping); higher rates for special hazards per §7
• ▶Duration: Minimum 30 min for suppression; 60 min for cooling exposures (adjacent equipment that must be kept cool while the fire burns)
• ▶Monitor positioning: Outside the likely fire zone; adequate throw range to reach all protected surfaces
• ▶Control valves: Accessible and supervised OS&Y or equivalent for each monitor position

Standard for Low-, Medium-, and High-Expansion Foam

Governs foam-water monitor systems protecting Class B hazards. Key requirements:

• ▶Application rate (monitors): Minimum 6.5 L/min·m² of liquid surface area for AFFF; higher for protein or AR-AFFF foams
• ▶Duration: Minimum 65 minutes of foam concentrate supply for fixed monitor systems at flammable liquid storage facilities
• ▶Proportioning: Foam concentrate must be injected upstream at the correct proportioning rate (3% or 6% for AFFF) using a listed proportioner

Application of Fixed Water Spray Systems for Fire Protection in the Petroleum Industry

An industry-specific guideline that supplements NFPA 15 for petroleum facility applications. API 2030 provides detailed guidance on the application rates, nozzle types, and monitor positioning for specific petroleum industry equipment types — pumps, heat exchangers, vessels, crude oil storage tanks and loading racks. Most insurance underwriters for petroleum facilities require compliance with both NFPA 15 and API 2030.

Code for Design of Fixed Fire Monitor Extinguishing System (China)

The mandatory standard for all fixed fire monitor system designs in China. Specifies design flow rates by occupancy type, minimum monitor numbers per protected area, simultaneous coverage requirements (any point in the protected area must be reachable by at least two monitors), and pipe sizing rules. Petroleum storage areas are covered under §4 with specific monitor spacing and flow rate tables by tank diameter and product type.

Foam-water monitors positioned outside the bund wall to reach the tank shell and liquid surface. Both the PL Series handle (for attended positions) and PL Series turbine-worm (for high-flow positions ≥40 L/s) are specified depending on flow rate. All tank farm foam-water monitors must operate with the foam proportioning system active — specifying water-only monitors at tank farm positions is a design error under NFPA 11.

The monitor-to-tank distance must be outside the bund wall at minimum. NFPA 11 §11.6 gives positioning requirements as a function of tank diameter and the monitor’s throw range.

PL Foam-Water Monitor →

Water monitors at process unit positions provide cooling for pressure vessels, reactors, heat exchangers and structural steelwork. The objective is heat removal — keeping adjacent equipment below temperature thresholds that would cause failure or escalation. High flow rates (50–80 L/s) are common because the cooling demand calculation per NFPA 15 typically requires significant flow at each position to maintain the required application rate across the vessel surface area.

At flow rates of 50 L/s and above, the PS Turbine-Worm (worm-gear) is mandatory — the nozzle reaction force at these flow rates makes handle operation impractical for extended discharge durations.

PS Turbine-Worm Monitor →

Loading racks for road tankers and railcar filling positions are high-risk Class B locations where vehicle collisions during loading are a significant hazard. Foam-water monitors at loading rack positions must be mounted on anti-collision bases (PZ-1.6C variant) because road vehicles pass close to monitor positions during normal operations. The gear-driven anti-collision mechanism allows the monitor stem to absorb a vehicle strike without fracturing the buried pipe connection.

Loading rack foam-water monitors are often positioned to provide simultaneous coverage from multiple angles — a single spill can involve several loading bays if product spreads across the rack floor slab.

PZ Anti-Collision Base →

Pump rooms, compressor buildings, subsea platform topsides and remote process areas where personnel cannot safely approach during a fire require electric remote control monitors. The RCFM links to the plant fire and gas detection system — when a detector triggers, the controller activates the monitor, aims it at the pre-programmed position for the triggered zone and begins discharge automatically. No personnel required at the monitor.

Remote control monitors at petrochemical plants are typically specified with IP65 rating for outdoor use and explosion-proof motor certification for use in Zone 1 or Zone 2 classified areas where required by the hazardous area classification study.

RCFM Remote Monitor →

Position outside the hazard zone — never inside the bund

Monitors must be placed at a safe distance from the protected equipment — outside bund walls for tank positions, outside the blast hazard zone for process equipment. The long throw range of fixed monitors (up to 85 m) is specifically designed to satisfy this requirement. A monitor positioned inside a bund will be inaccessible and likely damaged when it is most needed.

Two-monitor coverage at every point — no single points of failure

GB 50338 and NFPA 15 both require any point in the protected area to be reachable simultaneously by at least two monitors from different angles. In practice: plot range circles on a site plan for each monitor and verify all protected equipment surfaces fall within at least two overlapping circles.

Approach angle: minimum 30° separation between adjacent monitors

Two monitors covering the same point from almost the same angle provide less effective redundancy than two monitors from significantly different approach angles. A minimum 30° angular separation between any two monitors covering the same point ensures that if one monitor stream is blocked by smoke, heat or structural obstruction, the other monitor’s stream arrives from a meaningfully different direction.

Allow for wind: reduce effective range by 10–15% for exposed sites

Throw range data is measured in still air. At exposed coastal, offshore or open-site petrochemical locations where crosswinds are common, the effective reach of the monitor stream is reduced. Apply a 10–15% safety factor to the rated throw range when determining the maximum monitor-to-target design distance for outdoor positions in windy environments.

Hydraulic design: verify simultaneous operation demand against pump capacity

NFPA 15 requires the hydraulic design to account for the simultaneous operation of all monitors that can reach the fire target. For a large tank farm with several monitors positioned around each tank, this can result in a very large total flow demand. The fire water pump capacity and ring main pipe size must be verified to supply this demand at the required pressure without dropping below the minimum residual pressure at any monitor inlet.

Is a water spray fixed system the same as a fire monitor system at a petrochemical plant?

No — they are different systems. A water spray fixed system (governed by NFPA 15) uses spray nozzles pointed directly at equipment surfaces, designed to wet the entire surface uniformly. A fire monitor system delivers a directed jet stream that the operator (or automation system) aims at the fire. In practice, petrochemical plants often use both: spray systems for automatic fixed-direction cooling of specific equipment (pressure vessels, structural steel), and monitor systems for operator-directed or automatic fire attack and broader area cooling. They are complementary systems, not alternatives.

What foam concentrate type is required at a petroleum storage terminal?

For hydrocarbon fuels (crude oil, petrol, diesel, kerosene, aviation fuel), AFFF (Aqueous Film-Forming Foam) or FFFP (Film-Forming Fluoroprotein) at 3% or 6% proportioning is standard per NFPA 11. For water-miscible flammable liquids (alcohols, ketones, esters), AR-AFFF (Alcohol-Resistant AFFF) is required — standard AFFF breaks down when applied to water-miscible solvents. The foam concentrate type must be confirmed with the facility’s safety engineer and the applicable standard before specifying the foam-water monitor system and proportioning equipment.

How are monitors sized for tank cooling at a refinery?

Tank cooling monitor sizing starts with the cooling water demand calculation per NFPA 15 or API 2030: the wetted surface area of the tank and any adjacent tanks within the exposure distance is multiplied by the required application rate (typically 10.2 L/min·m² per NFPA 15 for cooling). This gives the total flow demand, which is then divided among the monitors that can simultaneously reach the tank surface from their installed positions. Each monitor must be capable of delivering its share of the flow at the available working pressure. Where the total demand exceeds the capacity of any single monitor, multiple monitors are required at each tank.

Can fixed fire monitors be used in classified (hazardous area) zones at petrochemical plants?

Manual and worm-gear fire monitors are passive mechanical devices — they have no electrical components and can be installed in any zone classification including Zone 0 and Zone 1. Remote control (electric) monitors installed within classified areas require explosion-proof or intrinsically safe motor and electrical enclosures certified for the applicable zone classification (ATEX/IECEx in Europe and international markets, or equivalent national certifications). Confirm the zone classification at each RCFM installation position before specifying the motor certification requirement.

Do fire monitors count as “fixed fire protection” for insurance purposes at petrochemical plants?

Yes — fixed fire monitors on permanent pipe bases are classified as fixed fire protection systems. FM Global Property Loss Prevention Data Sheets (specifically FM DS 7-88 for Fixed Water Spray Systems) and equivalent insurer guidelines recognise fire monitors as part of the fixed fire protection infrastructure that qualifies for insurance rating credits. The system must comply with the applicable NFPA standard and be maintained per NFPA 25. Confirm the specific insurer’s requirements with the facility’s insurance underwriter at the project design stage, as insurer requirements vary and may exceed the minimum standard requirements.