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| DECK
and HULL 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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HULL SIDE 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
DOWNLOAD CATALOGUE -
FW_Series.pdf
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DECK TOP COOLING
NOZZLES
- 90 degrees FULL CONE |
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T series is spiral through
hole non clog open orifice nozzles for unobstructed flow
passage.
Droplet sizes most effective
for deck cooling
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T48 Flow rate 574
Lpm @ 7 Bar
-
T56 Flow rate 777
Lpm @ 7 Bar
- T72 Flow rate 758 LPM @ 3 Bar
- T96 flow rate 1400 Lpm @ 3 Bar
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3 Circumference Spray with
170 degrees Full Cone
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Atomise Droplets range 650
microns to 2000 microns
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Height Trajectory upwards to
approx 4m to 5metre.
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1" or 1 1/2" (Male) NPT
connection
-
Brass or CuNi for Sea Water
Application.
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One piece construction,
-
Non Clog
DOWNLOAD CAT - T_Series.pdf
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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
HULL 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
Specifications
Hull Vertical surface area = 24,085 sq ft (2237.54
sq meter)
Hull height
: 16.0 meter
Height of water spray pipe ring : 12.35meter
Hence 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
Download Catalogue :
FW_Series.pdf
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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Calculating the quantities of
DECK 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
Deck 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)
Select Wilson Spiral Full Cone Nozzle "T" series
Model : 3/4T32-150
Flow rate : 166 liter/min @ 3 bar
Size : 3/4 inch male Npt
Material : Brass
Spray angle : 150 degrees Full Cone
Download Catalogue :
T_Series.pdf
Therefore total number of nozzles required @ 3bar =
22,797 divide by 166 = 137 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. |
| 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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