
Cylinder Cubic Content
Cubic content measures
the physical size of cylinder (or basket). It is the best way to
compare rated capacity of competitive machines. The higher the
cubic content, the more laundry the machine's cylinder can hold. It is calculated as follows:
(PI)R2
(radius of cylinder) x depth of cylinder / 1728 = cubic content of
cylinder
The accepted capacity for
washerextractors is between 5 and 7 lb. per cubic foot.
Accepted capacity for dryers is between 2.5 and 3.5 lb. per cubic foot.
Volume
Volume refers to the
available area within the basket or cylinder of the washer. Here are
some relationships between cubic content, gallons and liters.
1.0 cubic foot = 7.48
gallons = 28.27 liters
0.134 cubic foot = 1.0 gallons = 3.78 liters
GForce
GForce is a relative
measurement used to compare a washer's extraction capabilities (spin
cycle). Comparatively, higher RPM's relate to higher GForce when
the cylinder size is similar. However, larger diameter cylinders
can spin slower, yet attain a higher GForce than smaller diameter
cylinders. Here's the formula to calculate GForce:
RPM2
x diameter (inches) / 70,500 = "G" Force
Water
Data
Here's some specific data
on water:
About 60% of water used
in a typical laundry formula is hot
(if a conventional water system is used).
1 cu. ft. of water =
62.425 lb. 1 cu. ft of water = 7.48 gallons
gallon(s) x .1336 = cubic feet gallon(s) x 231 = cubic inches
pound of water x .016 = cubic foot pound of water x .12 = gallons
1 gallon = 8.33 lb. @ 62 degrees Fahrenheit (oF)
Boiling water = 212
Fahrenheit (ºF)
= 100 Celsius (ºC)
Freezing water = 32 Fahrenheit (ºF)
= 0 Celsius (ºC)
To convert to ºF;
multiply ºC
by 9, divide by 5, and add 32.
To convert to ºC;
subtract ºF
by 32, multiply by 5, and divide by 9.
Moisture Retention
Moisture retention
measures the water extracted from the load. The more water removed from
the load, the less drying time required. Too much water removal,
however, can damage fabrics. A certain amount of water retention is
required for finishing procedures. To calculate moisture retention, use
the following formula:
Weight after extraction 
dry weight / dry weight = Moisture Retention (%)
Water
Hardness
More tallow soap is
required for washing in hard water than in soft water. A water softener
may be required if grains/gallon of hardness exceed 3.
Water Hardness definitions:
Grains/Gallon
Parts/Million Description
less than 1.0 less than 17.1 soft
1.0 to 3.5 17.2 to 60 slightly hard
3.6 to 7.0 61 to 120 moderately hard
7.1 to 10.5 121 to 180 hard
10.6 & over 181 & over very hard
Electricity
To calculate approximate
electrical consumption, use the following formula for each motor in the
laundry (then total the results for all motors):
U x I x 1.7321 x PF /1000
x # of hours operated per day = kW/day
where: U = voltage (volts);
I = current (amps); PF = power factor
As a rule of thumb, assume
motors are running under a constant load ? such as a washerextractor
motor at .80.
Gas
Data
A BTU is the amount of
heat required to raise one pound of water approximately one degree
Fahrenheit (ºF):
> one Therm (TH) =
100,000 BTU
> one cubic foot = 1,000 BTU (approx..)
> one MCF (1,000 cubic feet) = 10 Therms (approx..)
> one cubic foot of Butane gas = 3,200 BTU
> one gallon No. 2 diesel fuel oil = 139,500 BTU (approx.)
> one gallon No. 6 fuel oil = 149,000 BTU (approx.)
> one kilowatt (kW) = 3,415 BTU
> one gallon propane = 92,000 BTU
Gas cost : The
cost of gas is usually stated in the price per therm or price per M or
MCF (1,000 cubic feet). In computing costs, the actual total to the end
user should be used, and divided by the number of therms used to find
the cost per therm. Various rate structures are used by local gas
suppliers. These include "straight line" rates, and
"block" rates in which the rate varies for various quantities.
Additional charges such as "demand charge", "commodity
charge", or "service charge" may also be part of the gas
cost. Any charge the customer may pay to receive gas, including sales
tax where applicable, should be included in the total gas cost from
which the actual cost per therm is derived.
Boiler Horsepower
one BHP = the work of
converting 34.5 lb. of water per hour from and at 212 ºF
to steam at 0 lb. gauge pressure.
one BHP = 33,500 BTU/hr
one BHP = 34.5 lb./steam
one BHP = 9.803 kilowatts
Metric Equivalents
1 U.S. gallon = 3.785
liters
1 cubic foot = 0.028 cubic meters = 28.317liters
1 foot = 0.3048 meters
39.37 inches = 3.28 feet = 1.0 meters
1 pound= 0.4536 kilograms
LAUNDRY
WEIGHTS CHART
Item /
Description 
Weight (Grams) 
Aprons 
350 
Bath Mat 
450 
Bath Towel 
750 
Bath Towel XL 
1000 
Bed Spreads 
1500 
Blankets  Honeycomb 
1200 
Blankets  Single 
1200 
Blankets  Double 
1700 
Hats / Caps 
1500 
Chef's Jackets 
500 
Chef's Trousers 
500 
Chef's Aprons 
350 
Draw Sheets  Cotton 
375 
Dust Coats  Pure Cotton 
450 
Dust Coats  Cotton 
650 
Duvet Covers Single 
1600 
Duvet Covers  King Size 
2500 
Face Cloths 
150 
Face Towels 
200 
Hand Towels 
350 
Mops  Small 
500 
Mops  Large 
200 
Overalls  Mens Cotton 
800 
Overalls  Mens Pure Cotton 
650 
Overlays 
400 
Pillowcases 
150 
Quilts  Single 
2000 
Quilts  Double 
4000 
Serviettes 
200 
Sheets  Single Pure Cotton 
450 
Sheets  Double Pure Cotton 
600 
Sheets  Single Cotton 
700 
Sheets  Double Cotton 
900 
Sheets  King Size Cotton 
1125 
Table Cloths  Small 
300 
Table Cloths  Medium 
500 
Table Cloths  Large 
700 
Theatre Gowns  Cotton 
650 
Uniforms  Ladies Pure Cotton 
400 
Uniforms  Ladies Cotton 
500 
This information courtesy of Division
of Building Technology, CSIR.



