Design of Manual Deluge Spray Systems

DOE-STD-1066-99

performance and/or engineering analysis) may continue to be used while

they remain serviceable.

14.8.4

14.8.4.1

Manual spray systems should be designed per NFPA 15 and modified as

follows (see Appendix C):

Density. Water spray density should be 0.25 gpm per sq. ft over the

entire filter area.

Spray pattern and nozzle type. Nozzles should be deluge spray

nozzles that form a full circle solid cone discharge.

Location from filters. Spray nozzles should be horizontally directed

at the face of the first series HEPA filters so that all areas of the first

stage filters and framing support system are wetted.

Activation by manual operation only. Activation should be by

manually activating deluge valve or opening a normally closed

Outside Screw & Yoke gate valve. Control devices to activate the

spray nozzle deluge valve should be provided in the process

operators control room or other locations accessible to fire fighters.

When a deluge valve is utilized, manual activation may be provided

at the deluge valve as well.

14.8.4.2

Manual water spray system equipment should be listed for their intended

use as required by NFPA 13 and NFPA 15.

14.8.4.3

Existing manual deluge spray systems that provide equivalent and reliable

fire protection for plenum filtration systems are acceptable.

14.8.5

Water Supply Guidelines

14.8.5.1

Water for the deluge spray systems should be provided by two separate

water supply connections for reliability. (One may be a fire department

connection if acceptable to the AHJ.)

14.8.5.2

Automatic and manual water spray system water supplies should be

hydraulically calculated and capable of supplying a simultaneous flow of

the automatic and manual water spray systems as well as the overhead

ceiling automatic fire sprinkler systems for the fire area providing air to the

plenum for a minimum period of 2 hours. A minimum 2-hour water supply

is not required when a limited water supply system, discussed below, is

justified and provided for criticality event reasons.