System Design
06-237619-001 3-17 April 2020
3-14.1 Back-Plate Manifold for Selector Valves
The solenoid valves with manual override used for controlling the opening of the Selector
valves are supplied as part of a back-plate manifold which holds the required numbers of
solenoid valves. The back-plate manifold receives pressure from the discharge manifold via a
pressure regulator reducing the supplied pressure to approx. 8 bar.
Note: The solenoid on the back-plate manifold leading to the hazard being protected by the
discharge must be continuously powered during the system discharge.
Figure 3-4. Back-Plate Manifold Arrangement
3-15 SELECTING NUMBER OF NOZZLES
The number of nozzles, their size and their location shall be such that:
• The desired design concentration is achieved in all parts of the protected enclosure within
the specified discharge time
• The discharge will not unduly splash flammable liquids or create dust clouds that could ex-
tend the fire
• The discharge will not create an explosion or harm personnel occupying the enclosure
• The discharge will not adversely affect the contents or integrity of the enclosure.
Evaluate the height of the nozzles with regard to where the fire may start, ensuring the
minimum and maximum height requirements are met.
When selecting the number of nozzles required the following factors may affect the distribution
of the discharged Agent and shall always be taken into account:
• The shape of the enclosure including the area and volume of any raised floor, suspended
ceiling or installed equipment (chimney effect).
• The location and shape of any obstructions
• The location of pressure relief openings
• Any architectural considerations (i.e. installation in a warehouse may allow for 1 ½”nozzles
whereas an office environment would require a number of smaller nozzles).
To Next Page
Loading...
Need help?
General
