Sizing and Planning a Laundry 16015 - Direct Machinery
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SIZING AND PLANNING A LAUNDRY
TABLE OF CONTENTS
SECTION 1 BASIC INFORMATION
Machine nomenclature Cylinder volume Load factor "G" forces
"G" forces Moisture retention
Water pressure Estimated peak water flow rates
Proper piping size Conversion factors Water hardness How to size a water softener
Sizing drain troughs Fuel-Unit of measure Natural gas
Calculating natural gas required to heat water Sizing a water heater LP gas Butane No. 2 (diesel) oil No. 6 (bunker) oil
Boiler horsepower Steam pressure Sizing a boiler
Electricity Motor full load currents charts
Electricity Linen cart capacity chart
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SECTION 2 SPACE ALLOCATION
Laundry space allocation
SECTION 3 LINEN ARTICLES WEIGHTS
Typical linen items and weights Weight of textile rental items
SECTION 4 LAUNDRY TASK INFORMATION FORMS
Hotel/Motel Prison Nursing Home Hospital
SECTION 5 SIZING WASHROOM EQUIPMENT
Guidelines for sizing wash room equipment Defining the task Hotel/Motel Nursing Home
Nursing Home Hospital Prison
Prison Division of work
Sizing washroom equipment 1-Washer-Extractors
2-Batch washers 3-Automatic batch dryer sizing
SECTION 6 FUNDAMENTAL WASH CHEMISTRY
Water Washing chemicals Surfactants
Alkalies Bleaches Finishing chemicals Antichlor Sours
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SECTION 6 FUNDAMENTAL WASH CHEMISTRY
Fabric softeners Sizing Wash steps Flushes Break Bleach suds Rinsing Temperature Number of rinse baths Dilution Antichlors Sour baths Extraction
SECTION 7 CONVERSION TABLES
Tables
SECTION 8 WATER CHARTS
Data Sheets by Model Number
SECTION 9 TERMINOLOGY
Glossary of textile items used by LSAA
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BASIC INFORMATION
NOMENCLATURE 42044 Washer Extractor First 2 digits (42) = Cylinder Diameter (inches) Last 2 digits (44) = Cylinder Depth (inches) Note: Other American Manufacturers use the same format
CYLINDER VOLUME
Formula: CDI = Cylinder Diameter in inches Cd = Cylinder depth in inches
CDI * CDI * cd CYLINDER VOLUME ( ft 3) 2,200
42" Diameter * 42" Diameter * 44" Depth 35.28 ft 3 2,200
LOAD FACTOR
Formula: CWGW = Clean Weight of Goods in Washer (lbs) CV= Cylinder Volume (ft3)
CWGW Load Factor CV
Example: 42044WP2 Washer Extractor Load Size = 200 lbs 42044WP2 Washer Extractor Cylinder Volume = 35.28 ft3.
200 Pound Load 5.66 Pounds per Ft 3. 35.28 Cu Ft
Note:
1. A generally accepted load factor (lbs of Linen/ft3 of Cylinder Volume) is between 5.50 to 6.50 lbs.
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2. High bulk goods, like the new micro denier fabric for surgical items, require the machine to be under loaded to 65% of its capacity.
3. Dense goods, like walk-on-mats permit the overloading of the machine by 30%.
"G" FORCES
DEFINITION: A Measure of Extraction's Efficiency to Remove Water.
Formula:
CRPM=Cylinder Revolutions per minute CD = Cylinder Diameter (Expressed in inches)
CRPM *CRPM *CD "G" FORCES 70,500
Example:
42044 WP2 with 700 RPM Final Extract Speed 42" Cylinder Diameter
700 RPM *700 RPM * 42" Diameter 292 "G' s" 70,500
Note:
1. The higher the "G" force, the greater the centrifugal force exerted on the goods. 2. One "G" equals 1 times the force of gravity. 3. Other factors which may affect Extraction are:
**Final bath temperature **Final bath chemicals **Length of extraction time **Type of goods (towels/sheets) **Ambient air humidity **% of cylinder open area to close area **Size of basket perforations **Type of material (cotton, 50/50) **Thickness of the load **Altitude of installation
WATER
MOISTURE RETENTION:
The amount of water contained in the linens after the final extraction. Expressed as a % of the dry weight of the goods being washed.
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NOTE:
MOISTURE RETENTION: Formula:
Example:
The DIN (German Industrial Norm, the equivalent of our American Standard Association) method adds 5% to the weight of dry textiles to account for the ambient humidity. This method assumes that goods that have been dried will, when allowed to sit on a shelf, absorb 5% of their bone dry weight.
American Norm (Bone dry method) WGAX = Weight of Goods after extraction DWG: Dry weight of goods
((WGAX DWG) *100) % Moisture retention DWG
42044 WP2 Washer Extractor 310 lbs = Weight of goods after extraction 200 lbs = dry weight of goods
((310 200) *100) 55% Moisture retention 200
Formula:
European Norm (DIN Method)
WGAX = Weight of goods after extraction DWG5 = Dry weight of goods plus 5% of its weight
((WGAX DWG5) *100) % Moisture retention DWG5
Example:
42044 WP2 Washer Extractor 310 lbs = Weight of goods after extraction 10 lbs = 5% of 200 lbs of Dry Weight
((310 (200 10)) *100) 47.62% Moisture retention (200 10)
200 lbs = Dry weight of goods
WATER PRESSURE:
The recommended water pressure is a range of 40 psi to 60 psi. Below 40, the washer extractor has to wait too long to fill. Above 60, there is the possibility of water hammer.
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