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TANK COOLING in accordance to NFPA 15 page
11 to 15 |
| NFPA chapter 15
page 11 to page 15 DESIGN and
INSTALLATION clause 4-4.3.2 VESSELS
delineates;
(a) These rules for exposure protection
contemplate emergency relieving capacity for
vessles, based upon a maximum allowable heat
input of 6,000 BTU per hour per sg ft
(18,930 W/sq m) of exposed surface area. The
density shall be increased to limit the heat
absorption to a safe level in the event
required emergency relieving capacity is not
provided.
(b) Water shall be
applied to VERTICAL or INCLINED vessel
surfaces at a Net Rate of Not less that 0.25
Gallon per minutes per sq ft (10.17 Liter
per minute per sq meter) of exposed
un-insulated surface |
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TANK COOLING
NOZZLES
-145 degrees FAN |
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Large Angle Deflection Principle
– Type FW
FW flat jet nozzles work on the
deflection principle conveying a
stream of water onto a machined
deflecting surface, producing a
wide angle flat spray pattern
having low impact value and
small droplets. Their round
orifice minimises the risk of
clogging.
Typical Applications:- Producing
Fire Curtain, Ship side cooling,
bulk head cooling, Oil Rig Hull
Cooling and washing of vertical
surfaces, washing fruits, stones
or any such material on a moving
conveyor.
Connection: 1/8" to 1" BSP or
NPT
Spray angles: 90° to 140°
Material: PVC, PP, 316 Stainless
Steel, Brass
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Adjustable Swivel joint rotating 70
degrees
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Adjustable Swivel
joint facilitates alignment of spray
nozzles on the header pipe to the
target surface.
Adjustment angles
between 40 to 70 degrees free the
guess work in nozzle locations.
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Calculating the quantities of
TANK COOLING
NOZZLES
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Quantity and type of spray nozzles
calculation as per NFPA 15 pg 11-15
Density to be applied on VERTICAL surface : 0.25 Gallon
per minutes per sq ft (10.17 Liter per minute per sq
meter)
Brief Case Example
Tank
Specifications
Tank diameter
: 57.7 meter
Tank height
: 16.0 meter
Height of water spray pipe ring : 12.35meter
Hence Tank Vertical surface area = 24,085 sq ft (2237.54
sq meter)
System water flow discharge rate = 24,085 x 0.25 =
6,031 gallon per minute (22,797Liter/m)
Other parameters in consideration
such as,
-
length of pipe ring : 4.14 x 57.7 = 181.2m
- No
of Riser : 4 each
-
Length of pipe ring per riser : 181.2 divide by 4 =
45.3meter
Select Wilson Wide Angle Fan Nozzle FW series
Model : 3/4FW500-145
Flow rate : 189 liter/min @ 3 bar
Size : 3/4 inch male Npt
Material : Brass
Spray angle : 145 degrees Fan
Therefore total number of nozzles required @ 3bar =
22,797 divide by 189 = 120 pieces .
Allow for thirty percent (30%) spray overlap, add
additional nozzles as fit
Note : calculation delineated above is to ascertain the
number of nozzles only, pressure loss in the pipe system
need to be calculated separately.
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| WATER
CURTAIN HORIZONTAL 150 degrees Flat Fan |
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WC Series Water Curtain Nozzle
distributes water in a flat curtain with 150 degrees
Fan spray.
Water Curtain Nozzle when mounted in pendent position
acts as a window spray nozzle. The nozzles when mounted in horizontal
position with flow towards ground, a flat water curtain
is produced to segregate the area which is under fire.
Size : 1/2" or 3/4 inch Male NPT,
BSP
Material :Brass, Stainless Steel
Download Catalogue -
Water Curtain.pdf
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| WATER
CURTAIN HORIZONTAL 240 /300 degrees Flat Fan |
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WILTEX Series
of
Water Curtain Horizontal Flat Fan Spray
designed for 240 degrees Fan and 300 degrees Fan. With a K factor of 23 and K-27 has an
external deflector which discharges water in a
horizontal flat circular shaped pattern of small droplet
size.
Mounted horizontally to uniformly distributed
water spray to form a water wall over the
surface to be protected.
Application : Water droplet wall to
prevent dust inflow,
mitigation of fumes or inbound
toxic gas or wall curtain
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WILTEX
300 FLAT FAN
Size : 1/2" (M) NPT or
BSPT
Spray angle : 300
degrees Flat Fan
Material : brass or
stainless steel
Download Catalogue
Wiltex 300 Flat.pdf
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WILTEX
240 FLAT FAN
Size : 1/2" (M) NPT or
BSPT
Spray angle : 240
degrees Flat Fan
Material : brass or
stainless steel
Download Catalogue
Wiltex 240 Flat.pdf
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