Fire Code of the Philippines Ebook - SafetySignsPH.com Fire Code of the Philippines eBook - SafetySignsPH | Page 107

L/min) per linear meter of water curtain, measured horizontally around
the opening.
8. The water curtain shall operate automatically from thermal responsive
elements of fixed temperature type so placed with respect to the
ceiling (floor) opening that the water curtain comes into action upon
the advance of heat toward the escalator opening.
9. Every automatic exhaust system, including all motors, controls and
automatic water curtain system shall be supervised in an approved
manner, similar to that specified for automatic sprinkler system
supervision.
D. Spray Nozzle Methods
1. Under the conditions specified in paragraph "B" (1) above, escalator
openings may be protected by the nozzle method, consisting of a
combination of an automatic fire or smoke detection system and a
system of high velocity water spray nozzle meeting the following
requirements:
a. Spray nozzles shall be in the open type and shall have a solid coni-
cal spray pattern with discharged angles between forty-five (45)
and ninety (90) degrees. The number of nozzles, their discharge
angles and their location shall be such that the escalator opening
between the top of the wellway housing and the treadway will be
completely filled with the dense spray on operation of the system.
b. The number and size of nozzles and water supply shall be sufficient
to deliver a discharge of one and four-tenths (1.4) liters of water
per square meter per second through the wellway, area to be
figured perpendicular to treadway.
c. Spray nozzles shall be so located as to effectively utilize the full
advantage of the cooling and counterdraft effect. They shall be
so positioned that the center line of spray discharge is as closely as
possible in line with the slope of the escalator, not more than an
angle of thirty (30) degrees with the top slope of the wellway
housing. Nozzles shall be positioned, also so that the center line of
discharge is an angle of not more than an angle of thirty (30)
degrees with the top slope of the wellway housing.
d. Spray nozzles shall discharge at a minimum pressure of 172 KPa.
Water supply piping may be taken from the sprinkler system,
provided that in so doing an adequate supply of water will be
available for the spray nozzles and the water pressure at the
sprinkler farthest from the supply riser is not reduced beyond the
required minimum.
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