I. Introduction to Early Suppression Fast Response (ESFR) Sprinkler K242 (Upright)
ESFR early suppression fast response sprinklers are fire-suppression sprinklers capable of early fire suppression due to their rapid response time and large flow coefficient, making them superior among all current sprinklers. Previously, several domestic manufacturers produced pendant-type ESFR sprinklers. However, the upright ESFR sprinkler (ESFR 202/68°C U) offers more convenient piping arrangements compared to the pendant-type ESFR sprinkler (ESFR 202/68°C P), better meeting the distance requirements from the roof deck, thus gaining greater favor among designers, installers, and users.
This ESFR sprinkler, along with the EC sprinkler, was submitted to the Tianjin Testing Center for inspection. [It is particularly noteworthy that this sprinkler differs from pendant-type sprinklers of the same specification. According to the requirements of GB5135.9-2006, it must undergo five rigorous full-scale fire suppression tests. The test materials consist of flammable standard plastic products (polypropylene plastic cups) and Type II test commodities (double triple-layer corrugated cardboard boxes), assembled into shelving units of varying heights (5.9-9.0 m) for fire suppression testing.] The test results indicate that the sprinkler’s fire suppression performance is qualified, capable of suppressing warehouse fires, and complies with the aforementioned standard requirements.

II. Application of Early Suppression Fast Response (ESFR) Sprinkler K242 (Upright):
The pendant-type ESFR fast response early suppression glass bulb sprinkler is a large-diameter sprinkler and a key component of automatic fire sprinkler systems. It serves both to detect fires and to extinguish them through automatic water discharge. Featuring a 2.5 mm glass bulb, a large nozzle diameter, and an extensive deflector, its Response Time Index (RTI) is ≤28±8 (m·s). This design ensures rapid response to fires, high flow rates, large water droplet diameters, and high fire suppression efficiency. Specifically designed for high-pile and high-rack storage warehouses, it offers distinct advantages over conventional sprinklers. It is suitable for protecting warehouses with ordinary hazards, storing Class I-IV commodities, plastic products, and mixed storage materials.