The Shilla Fire heavy-duty master stream monitor collection encompasses four flagship industrial models: SL-21A, SL-27A, SL-27B, and SL-27NE, engineered and manufactured by Shilla Fire Co., Ltd. (Korea). These advanced master stream appliances represent the pinnacle of fire suppression engineering, designed specifically for massive hazard scenarios across oil refineries, multi-million-gallon fuel storage terminals, marine chemical loading jetties, and heavy power generation complexes.

The series covers the complete tactical spectrum from mobile ground attack to remote explosion-proof automation:
1. Model SL-21A (Portable Ground Operation Monitor): Engineered for rapid ground deployment during dynamic industrial emergencies. It features dual NH 2-1/2" Female swivel inlets with an integrated clappered Siamese valve, allowing dual or single supply hose operation without backflow. Four foldable Stainless Steel (SUS304) legs with carbide-tipped ground spikes bite firmly into concrete or soil, redirecting hydrodynamic reaction forces directly downward for unmanned, rock-solid operation flowing 500 to 1,000 GPM.
2. Model SL-27A & SL-27B (Large-Size Handwheel Gear-Operated Monitors): Heavy-capacity stationed master stream monitors featuring 4" or 6" ANSI #150 flanged inlets. The expanded internal waterway minimizes pressure loss, permitting massive discharge capacities up to 2,000 GPM (7,600 LPM). Dual enclosed self-locking worm gears provide effortless 360° horizontal rotation and vertical pitch adjustments without drift. Model SL-27B incorporates an integral wafer-style isolation valve directly at the inlet flange. Optional UL Listed configurations available.
3. Model SL-27NE (Electric Remote-Controlled Explosion-Proof Monitor): Engineered for hazardous zones subject to extreme radiant heat, toxic vapors, or explosive gases where human access is impossible. Integrated heavy-duty servo motors control multi-axis movement (340° horizontal rotation, +80°/-40° vertical elevation, and nozzle spray pattern) via remote joystick consoles or centralized PLC systems. Certified to rigorous international explosion-proof standards EX d IIC T5 IP66 (gas flameproof) and EX Td A21 IP56 (dust ignition-proof).

Constructed from corrosion-resistant Hard-Anodized Aluminium Alloy, Cast Bronze (ASTM C83600), and Stainless Steel (SUS304/SUS316), and finished with UV-resistant Fire Red Epoxy powder coating, the SL-21A, SL-27A, SL-27B, and SL-27NE deliver uncompromising durability under extreme environmental and industrial conditions.

• Manufacturer: Shilla Fire Co., Ltd. (Korea)
• Product Series: Heavy-Duty Portable & Large-Size Gear / Electric Fire Monitors
• Rated Operating Pressure: 0.7 – 1.4 MPa (7 – 14 bar / 100 – 200 psi)
• Hydrostatic Test Pressure: 2.0 MPa (20 bar / 20 kgf/cm²)
• Media Compatibility: Firefighting water, seawater, and foam concentrates (AFFF, AR-AFFF)

--- DETAILED SPECIFICATIONS: COMPLETE 4-MODEL LINEUP ---
• SL-21A (Portable Ground Monitor):
  - Inlets: 2x NH 2-1/2" Female (FE65) with integrated Clappered Siamese
  - Outlet: NH 2-1/2" Male (FE65)
  - Flow Capacity: 500 – 1,000 GPM (1,900 – 3,800 LPM)
  - Horizontal Rotation: 360° rotation with locking pins
  - Vertical Elevation: Upwards +85° / Safety stop at +30° (anti-tip threshold)
  - Material: Hard-Anodized Aluminium body + Stainless Steel SUS304 folding legs with carbide tips
  - Net Weight: Approx. 14.5 kg

• SL-27A (Large-Size Gear-Operated Monitor):
  - Inlet Connection: ANSI #150 Flange 4" or 6" (100A / 150A)
  - Outlet Connection: NH 3" Male or NH 4" Male
  - Maximum Flow Capacity: 1,000 – 2,000 GPM (3,800 – 7,600 LPM @ 7 bar)
  - Drive Mechanism: Dual Handwheel Enclosed Self-Locking Worm Gear Drive
  - Movement Range: 360° horizontal rotation / +80° to -40° (or -15°) vertical elevation
  - Material: Hard-Anodized Aluminium Alloy or Cast Bronze ASTM C83600
  - Net Weight: 35 – 55 kg (UL Listed optional)

• SL-27B (Large-Size Gear Monitor with Built-in Isolation Valve):
  - Inlet Connection: ANSI #150 Flange 4" or 6"
  - Outlet Connection: NH 3" Male or NH 4" Male
  - Maximum Flow Capacity: 1,000 – 2,000 GPM (3,800 – 7,600 LPM)
  - Special Feature: Integrated Wafer-Style Isolation Valve at the base (c/w Isolation Valve)
  - Material: Hard-Anodized Aluminium or Cast Bronze
  - Net Weight: 42 – 68 kg (UL Listed optional)

• SL-27NE (Electric Remote-Controlled Explosion-Proof Monitor):
  - Inlet Connection: ANSI #150 Flange 4" or 6"
  - Outlet Connection: NH 3" Male or NH 4" Male
  - Maximum Flow Capacity: 2,000 GPM (7,600 LPM @ 7 bar)
  - Motorized Movement: Horizontal Max 340° / Vertical Elevation +80° ~ -40°
  - Power Supply: Monitor AC 220V 1-phase / Nozzle DC 24V
  - Flameproof Rating: EX d IIC T5 IP66 (Pressure-resistant & flameproof)
  - Dust Ignition-Proof Rating: EX Td A21 IP56
  - Material: Cast Bronze or Hard-Anodized Aluminium Alloy
  - Control Interface: Wireless / Wired Joystick Console & PLC Control Cabinet

• Quality Approvals & Compliance: KFI Approved (Korea Fire Institute), NFPA 11/1964, UL Listed options available, ATEX / EX d IIC T5 certified