Early Suppression Fast Response ESFR Sprinkler K363 (Pendant Type)

I. Introduction to the Early Suppression Fast Response (ESFR) Sprinkler K363 (Pendent Type):

The ESFR-363 Early Suppression Fast Response sprinkler is a large-flow, large-orifice sprinkler head. It serves as a key component in automatic fire sprinkler systems, primarily for fire detection and automatic suppression. The ESFR-363 sprinkler responds quickly and delivers more water to suppress a fire, rather than just controlling it like standard sprinklers.

The ESFR-363 sprinkler is approved for use in protecting ordinary hazard occupancies, warehouses storing Class I-IV commodities, plastic commodities, and mixed commodities, as well as other commodities specified by NFPA standards.

The ESFR-363 sprinkler is generally selected for wet pipe systems and is not permitted for use in dry pipe systems. When protecting valuable items, precision electronic equipment, computer rooms, or when ambient temperatures do not meet requirements, a preaction system shall be used.

II. Features of the Early Suppression Fast Response (ESFR) Sprinkler K363 (Pendent Type):

This ESFR-363 Early Suppression Fast Response sprinkler offers high flow and rapid activation. Each sprinkler provides a maximum protection area of 9.3 m², suitable for maximum storage heights of 9.1m to 12.2m, with a maximum ceiling height of 13.7m. The sprinkler's design pressure ranges from 0.14 MPa to 0.34 MPa. The system operates at lower pressures, producing larger water droplets and superior fire suppression performance.

One significant feature of the 363 ESFR sprinkler is that the system does not require in-rack sprinklers.

III. Warnings for the Early Suppression Fast Response (ESFR) Sprinkler K363 (Pendent Type):

1. The application of ESFR sprinklers has strict usage conditions: storage height, building height, roof slope, and relevant regulations for use in wet pipe systems, among others.

2. For situations where water leakage or accidental discharge is strictly prohibited, the ESFR-363 sprinkler must be used with a preaction system—an alternative to wet pipe automatic sprinkler systems. Preaction systems offer dual protection, eliminate delayed activation issues, and provide fire suppression efficiency equivalent to wet pipe systems.

3. The operating pressure of the sprinkler must strictly adhere to the relevant clauses of the "Automatic Sprinkler System Design Manual." Pressure should be controlled within the range of 0.14 MPa to 0.34 MPa. According to the corresponding clauses of GB50084-2001 (2005 edition), the automatic sprinkler system design规范 stipulates that the working pressure should be controlled within 0.1 MPa to 0.3 MPa (Clause 5.0.6). Operating outside these pressure ranges can affect fire suppression effectiveness.

4. Temperature requirements: Although fusible alloy elements have advantages over glass bulbs, they are extremely sensitive to temperature changes. The higher the ambient temperature, the lower their tensile strength. Especially when temperatures exceed 40°C, each 1°C increase causes a significant drop in tensile capacity. Therefore, fusible alloys are suitable for low and normal temperature regions (4°C to 35°C). When ambient temperatures exceed 35°C, their tensile performance gradually weakens. Consequently, sprinklers must never be installed below skylights, and ceiling insulation must strictly comply with standards.

5. Due to its structural design, the heat-sensitive assembly of the K=363 ESFR Early Suppression Fast Response sprinkler forms a geometric triangle. Apart from one main load-bearing rod positioned vertically on the sprinkler's central axis, the S-shaped lever acting as a leverage component and the fusible alloy solder link, despite excellent design not being directly exposed outside the sprinkler body for effective protection, still cannot entirely eliminate the risk of impact. Therefore, extreme care must be taken during all post-manufacturing stages (transportation, relocation, storage, installation, and other equipment operations on-site). Any impact causing damage is strictly prohibited.

6. The use of the K=363 ESFR Early Suppression Fast Response sprinkler requires vigilance against the possibility of forklifts moving in and out of storage racks or goods colliding with the sprinkler heads. Once damaged by impact, the sprinkler can cause endless problems. Sprinklers installed in modern high-bay logistics warehouses must allow for easy inspection and replacement.

IV. Main Technical Performance Parameters of the Early Suppression Fast Response (ESFR) Sprinkler K363 (Pendent Type):

1. Installation Type: Pendent, with deflector facing downward.

2. Nominal Diameter: 25 mm, Connection Thread: R1".

3. Maximum Rated Working Pressure: 1.2 MPa, Factory Seal Test Pressure: 3.4 MPa. 100% tested.

4. Flow Coefficient: K=363.

5. Response Time Index (RTI): ≤28±8 (m·s)^0.5.

6. Nominal Operating Temperature: 74°C, Ambient Temperature Range: 4°C to 40°C.

7. Maximum Coverage Area: 9.3 m².

8. Minimum Coverage Area: 7.4 m².