SPECIFICATIONS FOR FIRE HYDRANT & SPRINKLET SYSTEM.P5/6

c) Visual / audio alarms, not covered in individual sections.
d) Lamps healthy test facility.
e) Instruments, indicating lamps, pushbuttons, fuse terminal blocks etc. as
are required.
f) Test facility to simulate operation of hydrants.

1.20.4 Other Control Components

1.20.4.1 Pressure Switches.

Pressure switches shall be provided for switching on and off the pressurization
pump at present pressures and also for switching off the fire pump at present
pressure. Being the main component for initiating the signal for the operation of the
pumps, the pressure settings shall be totally reliable, sturdy in construction and of
long life. The pressure settings shall be adjustable.

1.20.4.2 Power Supply for Controls.

In order to ensure that the control systems remains co-operational at all times the
control system shall be designed for 24 VDC operation fed from the battery. This
shall be independent of the starting battery for the engine i.e. battery shall remain
trickle charged at all times from the separate battery charger at the control system.

1.21 Electrical Work and Earthing.

Scope.

This section covers the detailed requirements of electrical works including earthing,
for the materials installation.
Electric power supply shall be terminated in the incoking switch gear of the power
and control panel by the Department. All further connections to the various
components of the system shall be the responsibility of the contractor, for a
complete and working system, satisfying all the functional requirements.
The scope shall particularly include the following :
Power and Control Panel(s) as given in relevant section.
All inter-connections with multi-core armoured copper cables of size suitable
between various control units and control panel(s)
All power cable connections with multi-core armoured aluminium cables of size as
specified in BOQ, between panels, motors etc.
Necessary earthing with 2 Nos. G.I. plate electrodes and loop earthing.
The work shall be carried out conforming to CPWD General Specifications for
Electrical works Part-I (Internal) amended up to date and Part-II (External)
amended upto date.

1.22 Sprinkler System.

1.22.1 Sprinkler Heads.

Sprinkler heads shall be of quartzoid bulb type with bulb, valve assembly yoke and
the deflector. The sprinklers shall be approved make and type.

1.22.2 Types

1.22.2.1 Conventional Pattern.

The sprinklers shall be designed to produce a spherical type of discharge with a
portion of water being thrown upwards to the ceiling side of wall extra. The
sprinklers shall suitable for erection in upright position or pendant position.
A. Side Wall Sprinklers.
These shall be designed for installation along with the walls of room close to the
ceiling. The discharge pattern shall be similar to one quarter of sphere with a small
proportion discharging on the wall behind the sprinklers.

1.22.2.2 Construction

i) Bulb – Bulb shall be made of corrosion-free material strong enough to
with stand any water pressure likely to occur in the system. The bulb shall
shatter when the temperature of the surrounding air reaches a
predetermined level.
ii) Valve assembly – Water passage of the sprinkler shall be controlling
assembly of flexible construction. The valve assembly shall be held in
position by the quartzoid bulb. The assembly be stable and shall
withstand pressure surges or external vibration without displacement.
iii) Yoke : The yoke shall be made of high quality gunmetal. The arms of
yoke shall be so designed as to avoid interference with discharge of water
from the deflector. The sprinkler body shall be coated with an approved
anti corrosive treatment if the same is to used in corrosive conditions.
iv) Deflector : The deflector shall be suitable for either upright or pendent
erection. The deflector shall be designed to give an even distribution of
water over the area protected by each sprinkler.
B. Colour Code.
The following colour code shall be adopted for classification of sprinkler
according to nomination temperature ratings.
C. Sprinkler Temperature Rating.
D. Size of Sprinklers Orifices.
The sprinklers shall be of 15mm nominal bore size.

1.22.2.3. Pipes and Fittings

Pipes for sprinkler system shall be of black steel conforming to I.S. 1239 (Heavy
class).
Fittings for black steel pipes shall be malleable iron suitable for welding or
approved type cast iron fittings with tapered screwed threads.

1.22.2.4 Jointing.

Joint for black steel pipes and fittings shall be metal to metal tapered thread or
welded joints. A small amount of red lead may be used for lubrication and rust
prevention in threaded joints.
Joints between G.I. or black steel pipes, valves and other apparatus, pumps etc.
shall be made with G.I. or M.S. flanges with appropriate number of bolts. Flanged
joint shall be made with 3mm thick insertion rubber gasket.

1.22.2.5 Pipes Protection.

All pipes above ground and in exposed locations shall be painted with one coat of
red oxide primer and two or more coats of synthetic enamel paint of approved
shade.
Pipes in chase or buried underground shall be painted with two coats of hot
bitumen.

1.22.2.6 Pipe Supports

All pipes shall be adequately supported from ceiling or walls from structural clamps
fabricated from M.S. structural e.g. rods, channels, angles and flats. All clamps
shall be painted with one coat of primer and two coats of black enamel paint. The
contractor shall provide inserts at the time f slab casting or anchor fastener later.

1.22.2.7 Valves

Sluice vales of sizes 80mm and above shall be double flanged cast iron
conforming to I.S.780. Check valve shall be of cast iron double flanged conforming
to I.S.5312.
Valves on pipes 65mm and below shall be heavy pattern gunmetal valves with cast
iron wheel seat tested to 20 kg/sq.cm. Pressure. Valves shall conform to I.S. 778.
A. Air Valves
25mm dia screwed inlet cast iron single acting air valves on all high points
in the system or as shown on drawings.
B. Drain Valves
50mm dia black steel pipe conforming to I.S.1239 medium class with
50mm gunmetal full way valve for draining and water in the system in low
pockets.

1.22.2.8 Installation Control Valve.

Installation control valves shall comprise of the following :
a) One-man stop valve of full way pattern with gunmetal pointer to indicate
where open/shut.
b) One automatic alarm valve fitted with handle & cover.
c) One hydraulic alarm motor and going for sounding a continuous alarm
upon out-break of fire. One combined waste and testing valve including 5
mtr. Of tubing and fittings.
d) Alarm stops valve.
e) Strainer
f) Drain plug.
g) Padlock and strap
h) Wall box for installation of valve.

1.22.2.9 Pressure Gauges.

Burden type pressure gauges conforming to IS/BS specifications shall be provided
at the following locations.
a) Just above alarm valve.
b) Just below alarm valve, on the installation stop valve.
c) One pressure gauge on delivery side of each pump.
d) Required number of pressure gauges on pressure tank.
Piping shall be so installed that the system can be thoroughly drained. All the pipes
shall be arranged to drain to the installation drain valve. In case of basement and
other areas where the pipe work is below the installation drain valve / auxiliary
valves of the following sizes shall be provided.
a) 20mm dia valve for pipes up to 50mm dia.
b) 25mm dia valves for 65mm dia pipe.
c) 32mm dia valves for pipes larger than 65mm dia.