formule pentru vopsitorie

7/27/2019 Formule Pentru Vopsitorie

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Formulae for Estimating Square Meters from

Cubic Capacities(rough estimates)

Large Central Tanks: 1.0 m3

= 0.6 m2

Small Central Tanks: 1.0 m3

= 0.9.21 m2

Wing Tanks: 1.0 m3

= 1.26 m2

Deep Tanks: 1.0 m3

= 3.0 m2

Fore Peak: 1.0 m3

= 4.0 to 5.0 m2

Double Bottom: 1.0 m3

= 7.0 m2


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Formulae for Estimating Surface Areas of Ships

Underwater hull area: [(2 x WL) + B] x LBP x P

Vertical side area: 2 x WL x (LBP + 0.5B)

Flat bottom area: Underwater hull area - vertical side

Boottop area: 2 x WB x (LBP + 0.5B)

Freeboard area: 2 x WF x (LOA + 0.5B)

where WL Designated waterline

B Breadth extreme

LBP Length between perpendiculars

P Block coefficient

0.90 for VLCCs

0.85 for bulk carriers and tankers

0.73 for general cargo linersWB Width of boottop

WF Width of freeboard

LOA Length overall


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Table Of Conversion Factors

ToConvert From To Multiply By

Area square feet (ft)

m

square meters (m)

ft

0.0929

10.764

Volume Imperial Gallons

Imperial Gallons

litre

litre

US Gallons

US Gallons

litre

US Gallons

Imperial Gallons

US Gallons

Imperial Gallons

litres

4.55

11.20

0.22

0.264

0.833

3.785

Area / Volume ft/Imp. Gallon

ft/US Gallon

ft/US Gallon

m/Imp. Gallon

m/Imp. Gallon

m/litre

m/litre

m/litre

m/Imp.Gallon

m/litre

m/litre

ft/US Gallon

ft/Imp. Gallon

ft/US Gallon

0.0204

0.112

0.0245

0.2197

8.97

48.93

40.76Length centimetres

centimetres

feet

feet

inches

inches

microns

mils

inches

feet

centimetres

meters

centimetres

feet

mils

microns

0.394

0.0328

30.48

0.3048

2.54

3.2808

0.04

25.0

Weight kilogramspounds

poundskilograms

2.20460.4536

Pressure kg/cm

psi

psi

kg/cm

14.22

0.0703

Temperature Celsius

Fahrenheit

Fahrenheit

Celsius

[C x 9)/5] + 32

[(F - 32) x 5] / 9

Film Thickness wet

dry

dry

wet

wft x % volume solids / 100

dft x 100 / % solids by volume


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Spreading Rate/Coverage

Theoretical Spreading Rate/Coverage

The theoretical spreading rate or coverage of a coating is a function of the volume

solids. The volume solids is the percentage of the coating consisting at binder and

pigments which remain on the substrate forming the final paint film after the volatile

components or solvents evaporate.

In U.S. measurements, one U.S. gallon of paint with 100% solids by volume will cover

1604 square feet of surface area at a dry film thickness of 1 mil. The theoreticalcoverage of any coating can be calculated from the following formula knowing the

solids by volume (SBV) and the dry film thickness (DFT) desired:

1604 x SBV = theoretical coverage

DFT (mils)

Example: 65% solids by volume coating applied at 5.0 mils dry film

thickness

1604 x (0.65) = 208.52 ft/gal

5

In metric measurement one liter of paint with 100% solids by volume will cover 1000

square meters of surface area at a dry film thickness of 1 micron. To calculate the

theoretical coverage of a coating in metric units, utilise the following formula:

1000 x SBV = theoretical coverage

DFT (microns)

Example: 65% solids by volume coating applied at 125 microns dry film

thickness

1000 x (0.65) = 5.2 m/l

125


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Practical Spreading Rate / Coverage

The theoretical formulas above assume that all of the coating (except solvents) is

uniformly applied to the substrate with no overspray or application loss. The

theoretical coverage is used in calculating cost comparisons between coatings systems

and suppliers and establishes a factual starting point from which the practical

spreading rate/coverage can be estimated. The practical coverage makes allowances

for application losses and is a more reliable indicator of what will be experienced in

the field. Application losses are affected by many factors, including wind, application

technique, application equipment. and type/profile of the substrate to be coated. Lossfactors will vary depending on the specific situation.

The practical coverage/spreading rate of a coating is calculated as follows:

Theoretical coverage x (1 - Loss factor) = Practical coverage

Example:

Theoretical coverage of 200 square feet per gallon at recommended dry filmthickness

Loss factor of 30%

200 Sq. Ft / Gal x (1 - 0.30) = 140 ft/gal


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Paint Consumption

In order to estimate the total number of gallons necessary for a specific job, it is

necessary to know the total area to be painted. Theoretical and/or practical paint

consumption estimates can then be calculated using the following formulas:

Total Area (ft or m) = Theoretical Consumption (Gallons or Litres)

Theoretical Coverage (ft/gal or m/l)

or

Total Area (ft or m) = Practical Consumption (Gallons or Litres)

Practical Coverage (ft/Gal or m/l)

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