Pendent Fire Sprinkler Head
The pendent fire sprinkler head is an automatic water-based fire suppression component for commercial, residential, and light-hazard industrial occupancies. It uses a 68°C (155°F) glass bulb and a K-factor 5.6 gpm/psi½ (metric K=80 L/min/bar½) to deliver consistent discharge density over the design area.
Constructed from forged corrosion-resistant brass and rated to 175 psi (1.2 MPa / 12 bar) maximum working pressure, the sprinkler produces a standard spray parabolic pattern, directing the majority of flow downward to control or suppress fire at floor level. Standard 1/2″ or 3/4″ NPT threads provide compatibility with wet-pipe fire sprinkler systems commonly designed under NFPA 13 in North American projects.
This pendent fire sprinkler head is designed for fixed installation in wet-pipe sprinkler systems serving light and ordinary hazard occupancies such as offices, hotels, retail, and similar conditioned interiors. A 5 mm glass bulb filled with a calibrated liquid expands as ambient temperature rises; when the temperature reaches the nominal 68°C (155°F) rating, the bulb fractures and opens the waterway. Once the orifice is exposed, network pressure drives water through the K=5.6 gpm/psi½ (K80 metric) outlet, forming a standard spray pattern.
The deflector geometry is tuned to produce a parabolic distribution curve with the required minimum density at the design radius when the system is hydraulically balanced. This pattern directs most of the water downward and radially outward, supporting NFPA 13 design methods for standard spray sprinklers in wet systems. When installed at the proper elevation and spacing, the pendent head provides uniform coverage of the protected floor area.
The sprinkler body is manufactured from forged brass with a low-lead alloy composition suitable for fire protection service. Internal and external surfaces can be supplied in natural brass, chrome-plated, or polyester-coated finishes, depending on aesthetic or environmental needs. For projects requiring enhanced atmospheric resistance, the sprinkler can be specified with a surface finish validated by ISO 9227 neutral salt-spray exposure for extended corrosion resistance in typical indoor conditions.
Connection to the system piping uses 1/2″ or 3/4″ NPT (ASME B1.20.1) threads, allowing straightforward installation into welded, grooved, or threaded mains and branch lines. Pendent, upright, and horizontal sidewall configurations share a common internal flow path and orifice sizing so that hydraulic calculations remain consistent across layout variations. This reduces complexity when designers adjust orientations to accommodate beams, soffits, or architectural constraints.
Poseidon sprinkler can be supplied with project-specific finishes, identification markings, and packaging. Support includes technical data sheets, hydraulic performance curves, and design guidance aligned with NFPA 13 system criteria. Private-label options are available for distributors that require branded product families while maintaining consistent hydraulic characteristics across their catalog.
Forged Brass Body
Corrosion-resistant forged brass construction for long-term indoor service life when installed in conditioned environments.Standard-Response Glass Bulb
5 mm heat-sensitive bulb with a 68°C (155°F) temperature rating; additional temperature ratings available on request for special applications.K-Factor 5.6 (K80 Metric)
Nominal 5.6 gpm/psi½ (80 L/min/bar½) orifice supports common NFPA 13 design densities for light and ordinary hazard occupancies.Standard Spray Parabolic Distribution
Deflector designed to produce a parabolic spray pattern with the majority of flow directed downward, supporting code-compliant coverage at floor level.Working Pressure up to 175 psi
Rated for up to 175 psi (1.2 MPa / 12 bar) system pressure, suitable for most commercial and residential wet-pipe installations.Thread Options
Available with 1/2″ NPT and 3/4″ NPT connections for integration into new builds or retrofit systems using standard fittings.Finish and Orientation Choices
Offered in pendent, upright, and horizontal sidewall types with brass, chrome, white, black, or project-specific coatings for visible areas.OEM and Project Support
Supports OEM branding, private labeling, and project BOM matching, with technical documentation packages for consultants and contractors.
Commercial Buildings
Office floors, retail areas, corridors, and hotel lobbies where standard spray pendent sprinklers are specified under NFPA 13 designs.Light Hazard Industrial Areas
Packaging zones, assembly lines, electronics production, and similar spaces requiring reliable water-based fire control with standard K-factor heads.Residential and Mixed-Use Projects
Apartments, residential corridors, and common areas where the system designer uses NFPA 13 or NFPA 13R criteria with standard spray sprinklers.Public Institutions
Schools, libraries, museums, and meeting spaces where consistent hydraulic performance, corrosion resistance, and code alignment are required.
| Model | Thread Size | K-Factor (US / Metric) | Nominal Flow @ 50 psi (3.4 bar) | Style / Orientation | Nominal Operating Temp |
| PSFSH15-P | 1/2″ NPT | 5.6 gpm/psi½ / K80 L/min/bar½ | ≈ 40 gpm (150 L/min) | Pendent | 68°C (155°F) |
| PSFSH20-P | 3/4″ NPT | 8.0 gpm/psi½ / K115 L/min/bar½ | ≈ 57 gpm (215 L/min) | Pendent | 68°C (155°F) |
| PSFSH15-U | 1/2″ NPT | 5.6 gpm/psi½ / K80 L/min/bar½ | ≈ 40 gpm (150 L/min) | Upright | 68°C (155°F) |
| PSFSH20-U | 3/4″ NPT | 8.0 gpm/psi½ / K115 L/min/bar½ | ≈ 57 gpm (215 L/min) | Upright | 68°C (155°F) |
| PSFSH15-S | 1/2″ NPT | 5.6 gpm/psi½ / K80 L/min/bar½ | ≈ 40 gpm (150 L/min) | Horizontal Sidewall | 68°C (155°F) |
| PSFSH20-S | 3/4″ NPT | 8.0 gpm/psi½ / K115 L/min/bar½ | ≈ 57 gpm (215 L/min) | Horizontal Sidewall | 68°C (155°F) |
| PSFSH20-HP | 3/4″ NPT | 11.2 gpm/psi½ / K160 L/min/bar½ | ≈ 80 gpm (300 L/min) | Upright / Pendent (high-K) | 68°C (155°F) |
Design and Test Basis:
- UL 199 – sprinkler performance and endurance tests used as design and in-house validation references (product not UL-listed).
- NFPA 13 – intended for use in systems designed and installed in accordance with NFPA 13 standard spray sprinkler criteria.
Corrosion and Materials:
- ISO 9227 – neutral salt spray exposure used to evaluate finish and component corrosion resistance for selected configurations.
- RoHS-Aligned Materials – wetted parts and coatings selected to support RoHS material content requirements where applicable.
