Page 91 - Commercial Catalogue 2011

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www.tropicalmarinecentre.co.uk Tel: +44 (0) 1923 284151 Commercial Catalogue 86
Useful Information
Imperial to Metric
Metric to Imperial
Temperature
Length
Length
ft x 0.305 = m
m x 3.28 = ft
(°C x 1.8) + 32 = °F
in x 25.4 = mm
mm x 0.039 = in
(°F – 32) x 0.555 = °C
Area
Area
in
2
x 0.000645 = m
2
m
2
x 1550 = in
2
ft
2
x 0.0929 = m
2
m
2
x 10.764 = ft
2
Volume
Volume
ft
3
x 0.028 = m
3
m
3
x 35.31 = ft
3
imp gal x 4.546 = litres
litres x 0.22 = imp gal
US gal x 3.785 = litres
litres x 0.2642 = US gal
Weight
Weight
lb x 0.45 = kg
kg x 2.2 = lb
Pressure
Pressure
psi x 0.069 = Bar
Bar x 14.5 = psi
psi x 6.89 = kPa (kN/m
2
)
kPa (kN/m
2
) x 0.145 = psi
Bar x 100 = kPa (kN/m
2
)
kPa (kN/m
2
) x 0.01 = Bar
ft.hd x 2.98 = kPa (kN/m
2
)
kPa (kN/m
2
) x 0.33 = ft.hd
in.w.g. x 0.249 = kPa (kN/m
2
)
kPa (kN/m
2
) x 4 = in.w.g.
mmHg x 0.1333 = kPa (kN/m
2
)
kPa (kN/m
2
) x 7.5 = mmHg
Velocity/Flow Rate
Velocity/Flow Rate
gpm x 0.076 = l/s
l/s x 13.2 = gpm
lbs/hr x 0.000126 = kg/s
kg/s x 7937 = lbs/hr
ft
3
/min x 0.000472 = m
3
/s
m
3
/s x 2119 = ft
3
/min
ft
2
/min x 1.7 = m
3
/hr
m
3
/hr x 0.588 = ft
3
/min
ft/min x 0.0051 = m/s
m/s x 197 = ft/min
ft/s x 0.305 = m/s
m/s x 3.28 = ft/s
Heat and Energy
Heat and Energy
BTU x 0.00029 = kW
kE x 3412 = BTU
BTU x 0.252 = K.Cal/hr
K.Cal/hr x 3.97 = BTU
HP x 746 =W
W x 0.0013 = HP
J x 0.00028 =W
W x 3600 = J
Calorie x 4.184 = J
J x 0.239 = Calorie
Guidelines for Sizing Biofilters
10 kilos of fish
wet weight
held in a tank and fed
0.1 kilos food
dry weight
each day (based on 1% of biomass feed rate), containing
50 grams of protein
dry weight
(based on food with a 50% protein content) produces
8 grams of TAN (Total Ammonia Nitrogen)
dry weight
per day which must be removed by your biological filter.
In an aerobic biological filter 1 gram of Ammonia or TAN (NH
3
-N) converts to 3.3 grams of Nitrite
(NO
2
-N), which converts to 4.4 grams Nitrate (NO
3
N).
This process:-
USES
PRODUCES
4.2 grams of Oxygen
8.6 grams of Carbonic Acid
7.2 grams of Alkalinity (as CaCO
3
)
3.7 grams of Water
5.9 grams of Carbon Dioxide
Note – Please use with caution!!
Actual figures will depend on design of filter, type of media,
application and environmental conditions particularly temperature, salinity and alkalinity.
1. 1 kilo of fluidised sand can convert between 4 and 16 grams of TAN per 24 hours.
2. 50 – 200m
2
of surface area of biofilter is needed to process 1 kilo of dry food per day.
3. 1m
2
surface area of biofilter can convert 0.5 – 1.4 grams of TAN per day.
4. 1.5 litres to 2.6 litres of random fill media (230 – 400m
2
/m
3
) is required per kilo of fish held.