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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
3.1.2 Choosing Proper System Type
It is necessary for the system designer to consider the physical characteristics and layout of the hazard to
ensure proper protection. e system must meet the criteria for a particular hazard and the requirements
of NFPA 17 for the system to be effective. ere are three separate hazard categories. Each category has its
own specific installation requirements. It is imperative that the system designer properly identify the fire
hazard in order to effectively remain within system parameters. e remainder of this Section is dedicated
to matching the dry chemical system to each of the three separate hazard coverage categories:
1. General Purpose and Industrial Hazards: Typically, general purpose and industrial hazards are
protected by either total flooding an enclosure with dry chemical or locally applying the dry chemical to
the hazard directly. Depending on the type of hazard being protected the following nozzles can be used
in applications that meet the classification for general purpose and industrial hazards:
Section 3 System Design
Table 3.1.2a - General Purpose and Industrial Usage Nozzles
Part Number Description
16216 Local Application Overhead (LAOH) Nozzle
16170 Local Application, Tankside (TS) Nozzle
16172 Total Flood (TF) Nozzle
16174 Three Way Nozzle
16190 Duct and Plenum (D/P) Nozzle
16192 Screening (SCR) Nozzle
17809 Total Flood Perimeter (TFP) Nozzle
See Table 2.6.2 JSH-360 Nozzle
See Table 2.6.2 JSH-180 Nozzle
a. Local Application – Overhead: is system is used for applying agent on a hazard from above.
Typical applications include dip tanks, power generators, and transformers. e maximum nozzle
height for overhead protection is 10 ft (3048 mm). Refer to Section 3.2 for design limitations.
b. Local Application – Tankside: is system is used for applying agent across a hazard area from
the side of the area. Typical applications include, but are not limited to, dip tanks, quench tanks, and
solvent tanks where overhead obstructions are present. Refer to Section 3.2 for design limitations.
c. Total Flooding: is system is used to fill a volume with agent to protect any hazard within that
volume. Typical applications include hazardous storage containers and warehouses. Total flooding
systems require a fixed enclosure to be present around the hazard area to allow the system to build
up the proper concentration of agent within the hazard area.
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